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Simultaneous Online Damage Detection and Vibration Control of Structures Using Synchronization and Semi-Active Control Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2021-01-20 Mahdi Moradmand; Fereidoun Amini; Pedram Ghaderi
In this paper, a smart structure is developed by integrating a semi-active control strategy with an online synchronization-based damage detection method. In this algorithm, the structural damages are identified in real-time with the synchronization-based method using displacement and velocity measurements of the structure. Then, a fuzzy logic controller is applied for determination of the control forces
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Time-Varying Parameter Identification of Bridges Subject to Moving Vehicles Using Ridge Extraction Based on Empirical Wavelet Transform Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2021-01-18 Jiantao Li; Jian Guo; Xinqun Zhu
For a vehicle moving over a bridge, the vehicle-bridge interaction (VBI) embraces the time-varying modal parameters of the system. The identification of non-stationary characteristics of bridge responses due to moving vehicle load is important and remains a challenging task. A new method based on the improved empirical wavelet transform (EWT) along with ridge detection of signals in time-frequency
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Generative Adversarial Networks-Based Stochastic Approach to the Modeling of Individual Jumping Loads Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2021-01-18 Shuqian Duan; Jiecheng Xiong; Hui Qian
Features of jumping loads are essentially high-dimensional random variables but have been simplistically modeled owing to the lack of proper mathematical tools. Generative adversarial networks (GANs) in conjunction with deep learning technology are adopted herein for modeling the jumping loads. Conditional GANs (CGANs) combined with Wasserstein GANs (WGANs) with gradient penalty (WGANs-GP) are adopted
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Experimental Study of the Effect of Proximity between Adjacent Buildings on their Dynamic Response Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2021-01-18 Gonzalo Barrios; Tam Larkin; Nawawi Chouw
Most of the experimental works on adjacent structures consider a short distance between them to analyze the interaction. Additionally, the majority of these studies focus on changes in the dynamic response of the buildings (e.g. acceleration, lateral displacement, or rocking) assuming that the fundamental frequency and the damping of the structures remain the same as those for the stand-alone case
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Nonlinear Behaviors of Spinning Pipes Conveying Fluid with Pulsation Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2021-01-18 Morteza Khoshroo; Mojtaba Eftekhari
Bifurcation analysis is conducted to investigate the dynamics of a spinning pipe conveying fluid with pulsation. The partial differential equations of the system are obtained by considering the nonlinearity in curvature and inertia. They are then discretized to the ordinary differential equations by means of the Galerkin expansion so that the primary and combination resonance conditions are imposed
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Vibration-based Monitoring for Transverse Cooperative Working Performance of Assembled Concrete Multi-Girder Bridge: System Design, Implementation and Preliminary Application Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2021-01-09 Zhaoyuan Xu; Danhui Dan; Lu Deng
The hinge joints of the assembled concrete multi-girder bridge (ACMGB) are the main components of transverse transmission of loads and the decline of their transmission capacity would lead to the degradation of the transverse cooperative working performance (TCWP) of the multi-beam system. As the key working performance of this kind of bridges, its severe degradation would result in the single-girder-bearing
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Free Vibrations of Steel–Concrete Composite Beams by the Dynamic Direct Stiffness Method Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2021-01-09 Qikai Sun; Nan Zhang; Xiao Liu; Xiaoyan Tao
A new dynamic direct stiffness method for analyzing the natural vibration characteristics of steel–concrete composite beams (SCCBs) is proposed, which considers the effect of partial interaction between the interface of the concrete slab and steel beam. The advantage of the method is that exact solutions can be obtained due to no introduction of approximated displacement and/or force fields in the
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Stability of Layered Structures with Hybridized Configuration by Means of a Reddy-Type Higher-Order Finite Element Formulation Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2021-01-06 Zhen Wu; Jie Zhou; Zhengliang Liu; Rui Ma; Xiaohui Ren
To make use of the merit of designability, each lamina in layered structures may possess diverse materials and geometry to realize specific application. For the hybridized structures, geometry and material properties relative to the middle surface are generally unsymmetrical, which have a significant impact on stability. Some models might lose capability to deal with such issues, so that these issues
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Adaptive Amplifier for a Test Vehicle Moving Over Bridges: Theoretical Study Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-12-29 Y. B. Yang; Z. L. Wang; K. Shi; H. Xu; J. P. Yang
A vibration amplifier is first proposed for adding to a test vehicle to enhance its capability to detect frequencies of the bridge under scanning. The test vehicle adopted is of single-axle and modeled as a single degree-of-freedom (DOF) system, which was proved to be successful in previous studies. The amplifier is also modeled as a single-DOF system, and the bridge as a simple beam of the Bernoulli–Euler
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An Efficient Dimension-Adaptive Numerical Integration Method for Stochastic Dynamic Analysis of Structures with Uncertain Parameters Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-12-28 Helu Yu; Bin Wang; Zongyu Gao; Yongle Li
This paper presents a novel dimension-adaptive numerical integration method for dynamic analysis of structures with stochastic parameters subjected to deterministic excitations. First, an efficient dimension-adaptive algorithm is proposed to detect the importance of each random parameter involved in the structural model, based on which the quadrature nodes used for numerical integration can be collocated
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Stability of Stainless Steel I-Section Beam-Columns at Elevated Temperatures Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-12-28 Merih Kucukler; Zhe Xing; Leroy Gardner
With the growing use of stainless steel in the construction and offshore industries, there is an increasing interest and need to study the performance of stainless structures at elevated temperatures. The behavior and design of stainless steel I-section beam-columns in fire is investigated in this paper, addressing a scarcity of previous research on this topic. Finite element (FE) models of stainless
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Stochastic Extended Finite Element Implementation for Natural Frequency of Cracked Functionally Gradient and Bi-Material Structures Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-12-28 Ahmed Raza; Himanshu Pathak; Mohammad Talha
In this work, stochastic perturbation-based vibration characteristics of cracked bi-material and functionally graded material (FGM) domain with uncertain material properties are investigated using the extended finite element method. The level set function is implemented to track the geometrical discontinuities. The partition of unity-based extrinsic enrichment technique is employed to model the crack
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Breathing Crack Localization in Structures Based on Principal Component Analysis of Forced Vibration Responses Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-12-24 J. Prawin
The identification of a breathing crack is a highly challenging inverse problem in structural health monitoring. A novel output-only damage diagnostic technique based on Principal Component Analysis (PCA) is proposed for breathing crack identification in structures excited by harmonic excitation. The proposed approach basically utilizes the residues obtained from PCA of the forced acceleration-time
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Periodic Response and Stability of a Maglev System with Delayed Feedback Control Under Aerodynamic Lift Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-12-23 Han Wu; Xiao-Hui Zeng; Ding-Gang Gao
In this research, the periodic response and stability of a nonlinear maglev system under the combined effects of steady and unsteady aerodynamic lifts is investigated, considering time delay in the feedback control loop. First, a nonlinear maglev system with a single levitation point that accounts for the nonlinearity of the electromagnetic force, time delay in the feedback control loop, and effect
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Thermal Postbuckling of Temperature-Dependent Functionally Graded Nanocomposite Annular Sector Plates Reinforced by Carbon Nanotubes Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-12-22 Raheb Gholami; Reza Ansari
In this study, the thermal buckling and postbuckling of functionally graded (FG) nanocomposite annular sector plates reinforced by carbon nanotubes (CNTs) are numerically analyzed. The effective material properties of FG nanocomposite are temperature-dependent (TD) and evaluated via the modified micromechanical method and rule of mixture. Based on the higher-order shear deformation theory (HSDT) and
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Nonlinear Blast Responses of Thin Shell Roof Over Long Span Structures Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-12-21 Jake Rennie; Sakdirat Kaewunruen; Charalampos Baniotopoulos
This paper adopts both explicit and implicit finite element methods in a specialist package LS-DYNA to investigate the nonlinear, dynamic response of a long span shell roof structure when subjected to blast loading. Parametric studies have been carried out on blast loaded laminated glass plates with reference to experimental results obtained by European researchers. A case study that has been chosen
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Uncertainty Updating of Finite Element Models Using Interval Analysis Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-10-14 Deshan Shan; Y. H. Chai; Hao Dong; Zhonghui Li
Uncertainties in structural parameters and measurements can be accounted for by incorporating interval analysis into the updating scheme of finite element models using a response-surface function. To facilitate the interval arithmetic operation, two different strategies are proposed in this paper to transform the response-surface function into a corresponding interval response-surface function. These
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Effect of Soil–Structure Interaction on Nonlinear Dynamic Response of Reinforced Concrete Structures Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-10-14 Christos Mourlas; Neo Khabele; Hussein A. Bark; Dimitris Karamitros; Francesca Taddei; George Markou; Manolis Papadrakakis
Investigating the nonlinear dynamic response of reinforced concrete (RC) structures is of significant importance in understanding the expected behavior of these structures under dynamic loading. This becomes more crucial during the design of new or the assessment of the existing RC structures that are located in seismically active areas. The numerical simulation of this problem through the use of detailed
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Elastic In-Plane Buckling of Funicular Arches Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-10-13 W. H. Pan; C. M. Wang
Buckling loads of arches could be significantly affected by the assumptions made on the load behavior during buckling. For a funicular arch whose centerline coincides with the compression line, we may consider two types of load behaviors based on how the line of load action shifts during buckling. This paper presents the governing differential equations for the elastic in-plane buckling problem of
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Mechanical Analysis of Functionally Graded Porous Structures: A Review Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-11-23 Helong Wu; Jie Yang; Sritawat Kitipornchai
Functionally graded porous structures (FGPSs), characterized by a continuous spatial gradient in both porosity and material properties, have been considered as the new generation lightweight structures. Research activities on FGPSs have grown rapidly in recent years. This paper is devoted to review the existing research works on FGPSs and to highlight the important advances in this emerging area. It
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Stability of Thin Web Composite Cantilever Beams of Random Lamination Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-12-03 Hayder A. Rasheed; Habiburrahman Ahmadi; Abdul H. Halim
This study addresses the analytical treatment of a closed-form buckling equation for lateral-torsional stability of thin web composite cantilever beams under mid-height tip force. The beam is composed of random ply fiber orientations. Classical lamination theory is embedded into the Vlasov plate formulation to make up the framework of the analytical treatment. A closed-form solution is realized when
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Estimation of Seismic Damage Induced by Near- and Far-Fault Earthquakes Using Modified Equivalent Linearization Method of Mid-Rise RC Buildings Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-12-03 Chien-Kuo Chiu; Lorddy Z. Nugroho; Wen-I. Liao
For the seismic design of a mid-rise reinforced concrete (RC) building considering the damage control, the main purpose of this work is to propose a simplified method that can be used to estimate the damage index or damage state induced by the near-fault and far-fault earthquakes. In addition to the maximum deformation response, the hysteretic energy dissipation induced the earthquakes is also considered
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Effect of Crack Closure on Magnitude of Modulated Wave Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-12-03 Sang Eon Lee; Jung-Wuk Hong
Fatigue cracks generated by repeated loads cause structural failures. Such cracks grow continuously and at an increasing speed owing to the concentration of stresses near the crack tips. Therefore, the early detection of fatigue cracks is imperative in the field of structural-health monitoring for the safety of structures exposed to dynamic loading. In particular, the detection of those cracks subjected
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Damage Sensitive PCA-FRF Feature in Unsupervised Machine Learning for Damage Detection of Plate-Like Structures Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-12-19 Pei Yi Siow; Zhi Chao Ong; Shin Yee Khoo; Kok-Sing Lim
Damage detection is important in maintaining the integrity and safety of structures. The vibration-based Structural Health Monitoring (SHM) methods have been explored and applied extensively by researchers due to its non-destructive manner. The damage sensitivity of features used can significantly ect the accuracy of the vibration-based damage identification methods. The Frequency Response Function
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Forest Trees as Naturally Available Seismic Metamaterials: Low Frequency Rayleigh Wave with Extremely Wide Bandgaps Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-12-16 Muhammad; Tingkai Wu; C. W. Lim
This paper presents a comprehensive study and it concludes that the resonance of forest trees with properly aligned conditions precisely working as naturally available locally resonant metamaterials that are equipped with wonderful capability of generating low frequency extremely wide bandgaps in the earthquake frequency range of interest. At the geophysical scale, the propagation of Rayleigh wave
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Dynamic Reliability Evaluation by First-Order Reliability Method Integrated with Stochastic Pseudo Excitation Method Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-12-12 Siyu Zhu; Tianyu Xiang
The stochastic pseudo excitation method (SPEM), which is based on the principle of pseudo excitation method (PEM), is introduced to represent the randomness of dynamic input in which the amplitude of excitation is adopted as a random variable. Based on the mathematic definition of power spectral density, a physical interpolation of the SPEM is discussed. Even if one random variable is involved in calculation
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An Efficient Non-Iterative Hybrid Method for Analyzing Train–Rail–Bridge Interaction Problems Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-12-12 Kang Shi; Xuhui He; Yunfeng Zou; Zhi Zheng
The dynamic interaction problem for the train–rail–bridge (TRB) systems presents a computational challenge, especially for the analysis of large-size TRB coupling systems. To address this issue, an efficient non-iterative hybrid method (NHM) is proposed. With this method, the integrated TRB system is divided into three subsystems, i.e. the train subsystem, the rail subsystem, and the bridge subsystem
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Parameter Influences on Rail Corrugation of Metro Tangential Track Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-12-10 Zhiqiang Wang; Zhenyu Lei
Rail corrugation can reduce riding comfort by vibration and noise, and even cause running accident. In this paper, the vehicle–track coupled dynamic model was developed for a metro’s tangential track considering the wear in rail materials. The influences of different track structure parameters and vehicle speed on the generation and development of rail corrugation of the tangential track were analyzed
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Feasibility Study of Super-Long Span Bridges Considering Aerostatic Instability by a Two-Stage Geometric Nonlinear Analysis Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-12-09 Jiunn-Yin Tsay
To meet the need of constructing fixed cross strait links, super-long span bridge with a main span over 2 000m is considered as a candidate for their ability to cross deep and wide straits. To this end, some super-long span bridges with proper cable and girder systems were previously proposed and studied. The major design considerations are aimed at adopting new cable material, increasing the entire
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Explicit Expressions for Buckling Analysis of Thin-Walled Beams Under Combined Loads with Laterally-Fixed Ends and Application to Stability Analysis of Saw Blades Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-12-07 Van Binh Phung; Ngoc Doan Tran; Viet Duc Nguyen; Prokopov V. S.; Hoang Minh Dang
This paper studies the critical issue of thin-walled beams with laterally fixed ends. The method for defining the formulae of twist moment for the beams subjected to combined loads was elucidated. Based on this, the governing differential equations of the beam were developed. The procedure for determining the critical state of the beam by the energy method was presented. With this procedure, the critical
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Experimental Study on Dynamic Amplification Factor of Simple-Supported Reinforced Concrete Beams Under Impact Loading Generated by an Impulse Hammer Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-12-07 Xue-Qian Wu; Bo Zhong; Yang Lv; Zhong-Xian Li; Nawawi Chouw
The empirical formulas of dynamic amplification factor (DAF) specified in current bridge codes only consider the span or fundamental frequency of reinforced concrete (RC) girders in highway. Although investigations have been carried out on different bridges with considering the road roughness, vehicle–bridge interactions and travelling velocity, but most of them have been done numerically. In this
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Dynamic Stability of Simply Supported Beams With Multi-Harmonic Parametric Excitation Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-12-05 Chao Xu; Zhengzhong Wang; Baohui Li
Determination of the regions of dynamic instability has been an important issue for elastic structures. Under the extreme climate, the external load acting on structures is becoming more and more complicated, which can induce dynamic instability of elastic structures. In this study, we explore the dynamic instability and response characteristics of simply supported beams under multi-harmonic parametric
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Reconstructing the Mass Distribution Function of a Two-Span Beam With an Overhang via the Fundamental Mode Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-12-04 Li-Hua Zhang; Min He; Qi-Shen Wang; I. Elishakoff
In this paper, we discuss the following inverse problem: how to reconstruct the mass distribution function of a two-span beam with an overhang via its polynomial fundamental mode and polynomial stiffness function. This leads to a basic equations group constituted by the coefficients of the mass distribution and the stiffness distribution function. To make the basic equations group match, one way is
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Aeolian Vibration Control of Power Transmission Line Using Stockbridge Type Dampers — A Review Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-12-04 Zhisong Wang; Hong-Nan Li; Gangbing Song
Due to its inherent low damping, a power transmission line is prone to wind induced vibration. Vibration control is needed to suppress the aeolian vibration of the transmission-line to reduce the fatigue and to extend its service life. Though patented in 1928, more than 90 years ago, the Stockbridge damper or its variants are still commonly used for vibration suppression of conductors in modern day
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Seismic Control of a Self-Anchored Suspension Bridge Using Fluid Viscous Dampers Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-11-28 Dongming Feng; Jingquan Wang
A self-anchored suspension bridge balances forces internally without external anchorage requirements, making it suitable for sites where anchorages would be difficult to construct. It often adopts either a full-floating or a semi-floating tower-girder connection system, which may result in large displacement responses along bridge longitudinal direction during earthquakes. This study investigated the
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Structural Behaviors of Integrally-Jointed Plywood Columns with Knot Defects Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-11-26 Zhuoyang Xin; Joseph Gattas
Modern factory automation is enabling the economic production of timber building components with sophisticated integral mechanical joints. This paper investigates the governing compressive failure mechanisms of full-length integrally-jointed plywood box columns, and in particular seeks to understand the interaction between localized material knot defects, integral box joint capacity, and column strength
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Equivalent Single Layer Models in Free Vibration Analysis of Laminated Multi-Layered Plates Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-11-25 Ireneusz Kreja; Agnieszka Sabik
The performance of selected equivalent single-layer (ESL) models is evaluated within several classical benchmark tests for small amplitude free vibration analysis of multi-layered plates. The authors elaborated their own Finite Element software based on the first-order shear deformation (FOSD) theory with some modifications incorporated including a correction of the transverse shear stiffness and an
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Time Response Stress Analysis of Solid and Reinforced Thin-Walled Structures by Component-Wise Models Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-11-25 R. Azzara; E. Carrera; M. Filippi; A. Pagani
This paper deals with the evaluation of time response analyses of typical aerospace metallic structures. Attention is focussed on detailed stress state distributions over time by using the Carrera Unified Formulation (CUF) for modeling thin-walled reinforced shell structures. In detail, the already established component-wise (CW) approach is extended to dynamic time response by mode superposition and
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A New Damage Detection Method for Special-Shaped Steel Arch Bridges Based on Fractal Theory and the Model Updating Technique Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-11-25 X. X. Cheng; G. Wu; L. Zhang; F. B. Ma
In this paper, an innovative two-level damage detection method applicable to real-world online structural health monitoring (SHM) systems is proposed for in-service large steel arch bridges. The method consists of Level 1 damage detection practice that includes strain data acquisition and damage location using the damage index based on the fractal theory, and Level 2 damage detection practice that
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Undrained Seismic Stability of Dual Unsupported Circular Tunnels Subjected to Surcharge Loading Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-11-25 Rui Zhang; Gaoqiao Wu; Minghua Zhao; Ming Lei
Undrained seismic stability of dual unsupported circular tunnels was investigated in this work using a self-developed code for adaptive finite element limit analysis. The so-called pseudo-static method was used to simulate the seismic effects during an earthquake. Accurate upper and lower bounds of seismic stability factor Ns were obtained by using an adaptive remeshing technique incorporated in the
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A Controllability-Based TO Approach for the Piezoelectric Actuator Design Considering Multimodal Vibration Control Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-11-20 Juliano F. Gonçalves; Emílio C. N. Silva; Daniel M. De Leon; Eduardo A. Perondi
This paper addresses the design problem of piezoelectric actuators for multimodal active vibration control. The design process is carried out by a topology optimization procedure which aims at maximizing a control performance index written in terms of the controllability Gramian, which is a measure that describes the ability of the actuator to move the structure from an initial condition to a desired
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Isogeometric Free Vibration Analysis of Curved Euler–Bernoulli Beams With Particular Emphasis on Accuracy Study Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-11-20 Zhuangjing Sun; Dongdong Wang; Xiwei Li
An isogeometric free vibration analysis is presented for curved Euler–Bernoulli beams, where the theoretical study of frequency accuracy is particularly emphasized. Firstly, the isogeometric formulation for general curved Euler–Bernoulli beams is elaborated, which fully takes the advantages of geometry exactness and basis function smoothness provided by isogeometric analysis. Subsequently, in order
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Failure Behavior of Double-Layer-Domes Subjected to Impact Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-11-20 E. Nazari; B. Shekastehband
The dynamic failure behavior of double-layer-domes subjected to impact is studied numerically through the nonlinear finite element software LS-DYNA. The parameters considered in this work include the mass, velocity, and size of impactor, impact direction, roof weigh, geometric imperfection, rise-to-span ratio, and depth of dome. The dynamic time-history response and energy conversion of the structure
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Temperature-Dependent Vibration of Various Types of Sandwich Beams with Porous FGM Layers Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-11-20 Mohsen Rahmani; Sajjad Dehghanpour
By using a high order sandwich beams theory which is modified by considering the transverse flexibility of the core, free vibration characteristics of two models of sandwich beams are studied in this paper. In type-I, functionally graded layers coat a homogeneous core, and in type-II, an FG core is covered by homogeneous face sheets. To increase the accuracy of the model of the FGM properties, even
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Numerical and Experimental Analyses of Free and Forced Vibration of Thin-Walled Beams Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-11-20 Wassim Jrad; Foudil Mohri; Guillaume Robin; El Mostafa Daya
The flexural–torsional vibration behavior of unrestrained and braced thin-walled beams is investigated by experimental and finite elements approaches. In the experimental part, tests in free and forced vibrations of thin walled beams with arbitrary sections are analyzed. By the help of an instrumental hammer test and a shaker machine, the natural frequencies and the response spectra of the beams are
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Energy Similitude Correction Method for Free Vibration of Cylinders Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-11-20 Lilin Zhou
Similitude theory has been applied to design scale models in many fields of engineering. As for free vibration of cylinders, the wall thickness is too thin to manufacture scale model, which leads to similitude distortion. The aim of this study is to correct the similitude distortion and establish the distorted similitude relationship for free vibration of cylinders. First, the complete and partial
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Influence of Material Stochasticity on Buckling Characteristics of Initially Imperfect Higher-Order Shear Deformable Gradient Plates Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-11-11 Mohammed Shakir; Mohammad Talha
This paper demonstrates the influence of material stochasticity on buckling characteristics of higher-order shear deformable gradient plates with initial geometric imperfections. The gradient plates are assessed by smooth variation in the volume fraction of the constituents (i.e. ceramic and metal) as power-law distribution function in the thickness direction. The effective material properties are
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Magneto-Aeroelastic Internal Resonances of a Rotating Circular Plate Based on Gyroscopic Systems Decoupling Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-11-11 Wenqiang Li; Yuda Hu
In this paper, a principal and 3:1 internal resonance of an edge-clamped conductive circular plate rotating in air-magnetic environment is investigated, where the electromagnetic force expressions and a simple empirical aerodynamic model are used in modelling. Based on the transverse displacement assumption with a combination of two degenerate linearized modes, the 2 degree of freedom (2-DOF) magneto-aeroelastic
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An Intelligent Analysis Method for Human-Induced Vibration of Concrete Footbridges Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-11-11 Bo Fu; Xinxin Wei
It is essential to reliably predict the human-induced vibrations in serviceability design of footbridges to ensure the vibration levels to be within the acceptable comfort limits. The human-induced structural responses are dependent on the dynamic properties of structures and human-induced excitations. For concrete footbridges, the elastic modulus of concrete is a vital parameter for determining the
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Moving Element Analysis of High-Speed Train-Slab Track System Considering Discrete Rail Pads Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-11-11 Tuo Lei; Jian Dai; Kok Keng Ang; Kun Li; Yi Liu
This paper presents a study of the dynamic behavior of a coupled train-slab track system considering discrete rail pads. The slab track is modeled as a three-layer Timoshenko beam. The study is carried out using the moving element method (MEM). By introducing a convected coordinate system moving at the same speed as the vehicle, the governing equations of motion of the slab track are formulated in
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A Method to Estimate Dynamic Buckling Response of an Unstiffened Plate Elastically Restrained Along all Edges Under In-Plane Impact Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-11-11 Bin Yang; Kunkun Fu; Yan Li
Unstiffened plates in structures are usually welded or fastened to supporting members, providing rotational restraint stiffness to the plate. Previous studies have shown that neglect of rotational restraint stiffness at the edges of a plate in a structure can introduce deviations in the analysis of dynamic elastic buckling. In this study, the in-plane impact-induced dynamic elastic buckling responses
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A Comparison of Nonlinear Bending and Vibration of Hybrid Metal/CNTRC Laminated Beams with Positive and Negative Poisson’s Ratios Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-11-07 Yin Yu; Hui-Shen Shen
Carbon nanotube reinforced composite (CNTRC) is one of the novel classes of advanced composite materials. This paper investigates the nonlinear bending and nonlinear vibration responses of hybrid laminated beams made of CNTRC layers bonded with metal layers on the top and bottom surfaces. We proposed a hybrid metal/CNTRC laminated beam for which out-of-plane Poisson’s ratio is negative. The effective
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Dynamic Performance of the LMS Maglev Train–Track–Bridge System Under Uneven Settlement for Two Typical Bridges Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-11-07 Dangxiong Wang; Xiaozhen Li; Ziyan Wu
To investigate the dynamic performance of the low-to-medium-speed (LMS) maglev train and bridge system under uneven ground settlement, a refined vertical dynamic interaction model of the LMS maglev train–track–bridge system with uneven settlement is proposed. Firstly, the numerical model is verified based on the field test. Secondly, the dynamic performances of the system induced by uneven settlements
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Analysis of Factors Affecting the Accuracy of Moving Force Identification Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-11-03 Zhen Chen; Lu Deng; Xuan Kong
In this study, the influence of the static component in the total force and the effective frequency bandwidth on the accuracy of force identification has been investigated. The acceleration and bending moment responses at different locations of a simply supported beam under different moving forces are numerically measured. The fast Fourier transformation is also introduced to analyze the frequency-domain
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A Pyramidal Lattice Frame: Pathways to Inversion Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-11-03 Yue Guan; Lawrence N. Virgin
This paper considers the load–deflection behavior of a pyramid-like, shallow lattice structure. It consists of four beams that join at a central apex and when subject to a lateral load, it exhibits a propensity to snap-through: a classical buckling phenomenon. Whether this structural inversion occurs, and the routes by which it happens, depends sensitively on geometry. Given the often sudden nature
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Control of Magnetoelectric Load to Maintain Stable Compression Ratio for Free Piston Linear Engine Systems Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-10-30 Bo Yang; Chenheng Yuan; Jiahui Li
The free piston linear engine system (FPLE) is considered as a promising powerplant, which has the advantages such as compact structure, short transfer path and variable compression ratio (CR) because the crank connecting rod is removed. However, the absence of crank-connecting rod inevitably produces uncertainty to the stable operation of the FPLE. A control system of the piston motion regulating
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Dynamic Force Loading Strategy for Effective Force Testing Considering Natural Velocity Feedback Compensation and Nonlinearity Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-10-29 Zhen Wang; Yong Ding; Aming Shi; Xizhan Ning; Bin Wu
The effective force testing is a promising seismic testing method for evaluating the structural dynamic response to earthquakes for conciseness and efficiency. However, two challenging loading issues are associated with this method, i.e. the natural velocity feedback (NVF) and nonlinearities related to the interaction between the loading system and specimen, thereby hindering its development and extensive
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Sensitivity Analysis of Composite Cellular Beams to Constitutive Material Models and Concrete Fracture Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-10-29 Felipe Piana Vendramell Ferreira; Carlos Humberto Martins; Silvana De Nardin
Composite cellular beams are an advantageous solution that can be used to reduce floor height by solving service ducts problems. In the previous literature, there is little information on numerical modeling that considers sensitivity analysis in composite cellular beams, varying the constitutive models of steel and concrete materials. The concrete, when submitted by external loading, undergoes volume
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Vibration Analysis of Bidirectional Functionally Graded Timoshenko Beams Using Chebyshev Collocation Method Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-10-29 Wei-Ren Chen; Heng Chang
This paper studies the vibration behaviors of bidirectional functionally graded (BDFG) Timoshenko beams based on the Chebyshev collocation method. The material properties of the beam are assumed to vary simultaneously in the beam length and thickness directions. The Chebyshev differentiation matrices are used to reduce the ordinary differential equations into a set of algebraic equations to form the
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Experimental and Numerical Analyses for Auto-Parametric Internal Resonance of a Framed Structure Int. J. Struct. Stab. Dyn. (IF 2.015) Pub Date : 2020-10-29 Yuchun Li; Wei Liu; Chao Shen; Xiaojun Yang
The auto-parametric internal resonance experiment of a Γ-shaped frame is first conducted in this research. A non-contact electromagnetic vibration exciter is used to exert a periodic force on the vertical beam of the frame. The phenomena of internal resonance and non-internal resonance are observed and measured in this test. A common resonance of the vertical beam is excited by the external electromagnetic