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Behaviors of welded hollow spherical joints strengthened by unidirectional annular ribs Structures (IF 1.839) Pub Date : 2021-01-15 Zhi Guo; Xiuchen Xu; Yansheng Du; Zhihua Chen
Welded hollow spherical joints are comprehensively used in spatial steel structures. However, the original joints cannot meet the strength requirements in some conditions, such as the corrosion, the fire and the change of structural load. Therefore, it is necessary to explore effective methods of strengthening the joints to maintain the durability and safety of the structures. This paper proposes and
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Damage identification by wavelet analysis of modal rotation differences Structures (IF 1.839) Pub Date : 2021-01-13 Andrzej Katunin; José Viriato Araújo dos Santos; Hernâni Lopes
In this paper, a novel damage identification approach based on differences in modal rotation fields obtained from shearographic measurements of structures and post-processed with the 2D continuous wavelet transform-based algorithm is presented. It is shown that the baseline approach, which assumes analysis of differences in modal rotation fields, allows to improve the sensitivity of a method to damage
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Strength, Deformation and Fragility assessment of Reinforced Concrete Moment Resisting frame designed by Force Based Design and the Performance Based Plastic Design method for Seismic loads Structures (IF 1.839) Pub Date : 2020-12-25 Sejal P. Dalal; Purvang Dalal
A 20 storied Reinforced Concrete (RC) Moment Resisting Frame (MRF) has been analysed and designed by Force Based Design (FBD) method and the Performance Based Plastic Design (PBPD) method. The PBPD frames were designed for all the three performance levels namely Immediate Occupancy, Life safety and Collapse Prevention of the basic safety objective. The guidelines of the Indian Standard codes along
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Experimental free vibrations test of steel braced frames reinforced with NiTi shape memory alloy wires Structures (IF 1.839) Pub Date : 2020-12-25 Kezia Varughese; Raafat El-Hacha
Shape memory alloys (SMA) have just recently made their way into structural design, and through studies have proved to be quite effective in increasing a structures strength and performance. Earthquakes are one of the most chaotic natural disasters that occur around the world, significantly impacting infrastructure to the point where cities lose their ability to function as bridges and hospitals are
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The influence of structural imperfections on the LTB strength of I-beams Structures (IF 1.839) Pub Date : 2020-12-25 Alexandre Rossi; Daniel Hideyuki Saito; Carlos Humberto Martins; Alex Sander Clemente de Souza
The structural imperfections, namely, the residual stresses, are generated during most manufacturing processes involving material deformation, heat treatment, machining or processing operations. The intensity and distribution of residual stresses are dependent on the techniques used in the production of steel sections (welding, rolling or cold formed techniques) and their dimensions. An appropriate
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Seismic performance assessment of a cemented material dam using incremental dynamic analysis Structures (IF 1.839) Pub Date : 2020-12-25 Khadije Mahmoodi; Ali Noorzad; Ahmad Mahboubi; Mohammad Alembagheri
Cemented Material Dams (CMDs) have drawn much attention over the last two decades. This study aims to assess the performance levels and capacity of CMDs using Incremental Dynamic Analysis (IDA) with emphasis on the tension failure mode. To this end, Tobetsu dam in Japan was subjected to a set of 17 ground motion records scaled to increasing intensity levels until failure. Then, by considering IDA curves
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Structural damage identification based on fast S-transform and convolutional neural networks Structures (IF 1.839) Pub Date : 2020-12-25 Behzad Ghahremani; Maryam Bitaraf; Amir K. Ghorbani-Tanha; Reza Fallahi
Measured signals from installed sensors on structures cannot solely provide beneficial information about the presence of damage. Many signal processing methods have been developed to extract useful data from raw signals. However, each method has its advantages and disadvantages. In the present study, the fast S-transform signal processing method has been used for the damage detection of structures
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Quasi-static cyclic performance of RC exterior beam-column joint assemblages strengthened with geosynthetic materials Structures (IF 1.839) Pub Date : 2020-12-25 Subhrasmita Majumder; Showmen Saha
The beam-column joints are the most critical and vulnerable part of the RC framed structures when subjected to earthquake load. The objective of the present study is to investigate the cyclic behaviour of seismic and non-seismic exterior reinforced concrete (RC) beam-column joints strengthened with innovative polymeric based geosynthetic materials. Two variants of geosynthetic material named geogrid
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Shake table study on seismic soil-pile foundation-structure interaction in soft clay Structures (IF 1.839) Pub Date : 2020-12-25 Swagata Deb Roy; Animesh Pandey; Rajib Saha
Seismic soil-pile foundation-structure interaction (SSPSI) especially in soft clay or liquefaction susceptible ground was reported as a key factor in seismic design by many investigators. Present study attempts to examine the influence of SSPSI on design response of pile foundation supported building structure embedded in soft clay through scaled model experiments using shake table. Study considers
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On the out-of-plane stiffness of I-section girders with corrugated webs using elastic finite element analyses Structures (IF 1.839) Pub Date : 2020-12-25 Yong-Bo Shao; Amany Refat Elsisy; M.F. Hassanein
Corrugated web girders (CWGs), nowadays, are widely used as bridge girders all over the world thanks to their superior shear resistance compared to I-girders with transversely-stiffened flat webs (IPGs). Additionally, it has been recently found that the out-of-plane stiffness of CWGs increases their lateral-torsional buckling resistance. However, based on the authors' experience, the literature does
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Free vibration analysis of a laminated composite sandwich plate with compressible core placed at the bottom of a tank filled with fluid Structures (IF 1.839) Pub Date : 2020-12-25 Arash Ramian; Ramazan-Ali Jafari-Talookolaei; Paolo S. Valvo; Maryam Abedi
The paper addresses the free vibration problem of a laminated composite sandwich plate with compressible core, placed at the bottom of a tank filled in with fluid. The analysis is performed based on the extended higher order sandwich plate theory (EHSAPT). First-order shear deformation theory (FSDT) is used for the face sheets. Cubic and quadratic polynomials are used to describe the in-plane and transverse
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Experimental validation of moving spring-mass-damper model for human-structure interaction in the presence of vertical vibration Structures (IF 1.839) Pub Date : 2020-12-25 Ehsan Ahmadi; Colin Caprani; Stana Živanović; Amin Heidarpour
The interaction between structures and walking humans is an important factor in vibration serviceability assessment of slender, lightweight, and low-damping structures. When on bridges humans form a human-structure system and interact with the structural vibration. The conventional vertical moving force (MF) model neglects human-structure interaction (HSI) effects. In contrast, a moving spring-mass-damper
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Structural fire safety design of square and rectangular tubed-reinforced-concrete columns Structures (IF 1.839) Pub Date : 2020-12-25 Dongdong Yang; Faqi Liu; Shan-Shan Huang; Hua Yang
The tubed-reinforced-concrete (TRC) columns have gained increasing use in the high-rise buildings and large-span stadiums in China, whereas the structural fire design method for square and rectangular TRC columns is still missing. Finite element analysis of the fire performance of square and rectangular TRC columns was conducted using a sequentially-coupled thermo-stress model. This model yielded good
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Investigation of various concrete materials to simulate seismic response of RC structures Structures (IF 1.839) Pub Date : 2020-12-25 Masoumeh Asgarpoor; Ali Gharavi; Siamak Epackachi
This paper focuses on the performance evaluation of several concrete models in reinforced concrete (RC) structures subjected to seismic loading. Despite many studies conducted on implementing different characteristics of concrete in constitutive models, there is an essential need for investigating the ability of these models in predicting the behavior of structures in seismic applications. In this
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Behavior of GFRP strengthening masonry walls using glass fiber composite anchors Structures (IF 1.839) Pub Date : 2020-12-25 Ahmed H. Ali; Bahira Abdulsalam
This paper presents experimental and theoretical investigations on the short-term behavior of stone masonry walls constructed with lime mortar. The walls were strengthened using unidirectional GFRP (Glass fiber reinforced polymers) sheets to resist out-of-plane loads. Two methods of anchorage were used to enhance the behavior of strengthened stone masonry walls by preventing premature peeling-off of
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Lateral soil pile structure interaction assessment for semi active tuned mass damper buildings Structures (IF 1.839) Pub Date : 2020-12-25 Mohammad Ghorbanzadeh; Eris Uygar; Serhan Sensoy
Using Lateral load-displacement curves (p-y curves) which is recommended by American Petroleum Institute (API) guideline, is typically used as a design approach for analysis of soil-pile-structure interaction due to its simplicity. The soil-pile structure interface has two separate parts of interaction; kinematic and inertial interaction. Both types of interaction must be measured accurately for the
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Conceptual design and experimental verification study of a special-shaped composite arch bridge Structures (IF 1.839) Pub Date : 2020-12-25 Pengzhen Lu; Junping Zhang; Dengguo Li; Yutao Zhou; Qingtian Shi
This paper presents experimental and analytical modal analyses of the Shizhi River Bridge, which is a concrete-filled steel tubular special-shaped composite arch bridge, with a span of 110 m, and is located in Zhongshan City, Guangdong Province, China. A three-dimensional finite element model (FEM) was developed, and an analytical modal analysis was performed to determine the static behavior, natural
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Reliability-based design optimization for the lattice boom of crawler crane Structures (IF 1.839) Pub Date : 2020-12-19 Jinping Li; Lin Bai; Wei Gao; Ning Shi; Ning Wang; Min Ye; Hairong Gu; Xinxin Xu; Jian Liu
The reliability-based design optimization (RBDO) problem involving discrete design variables and multi-working constraints is tackled with the consideration of the uncertainty factors in the optimal design of crawler crane’s lattice boom. In the optimization model, the uncertainties of material property, geometric parameters and loads are represented by random variables. The geometrical dimensions
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Cyclic loading behavior on strengthened composite beams using external post-tensioning tendons (experimental study) Structures (IF 1.839) Pub Date : 2020-12-19 Ahmed Ibrahim Hassanin; Hesham Fawzy Shabaan; Ahmed Ibrahim Elsheikh
In recent years, due to corrosion and the constant demand for increased traffic flow, it emerged that there is a need for an efficient system that can be used to repair and / or strengthen bridges and structures with steel–concrete composite section. There have been many strengthening techniques used to prevent such serious structural problems. One of these techniques, which has proven effective in
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Multiparameter seismic behavior of castellated beam-to-column connections based on stress migration Structures (IF 1.839) Pub Date : 2020-12-19 Ran Bi; Lianguang Jia; Pengyu Li; Qinghe Wang
This paper presents a study on the castellated beam-to-column connections with four regular hexagonal web openings and one solid web beam-to-column connection that considering the opening rate and whether there is a combination of floor slabs (composite action) while subjected to the cyclic loading. Furthermore, the initial geometric imperfection was carefully incorporated in the FE model and the models
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Response surface-based structural damage identification using dynamic responses Structures (IF 1.839) Pub Date : 2020-12-18 Kumar Anjneya; Koushik Roy
Response surface methodology (RSM) is efficient in updating a model as compared to a finite element model (FEM) based on updating techniques. This feature of RSM can be used to replace the time-consuming FEM-based updating step with a response surface-based surrogate model. In addition, RSM also solves the problem of slow convergence and time consumption. The present study deals with the applicability
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Predictive analyses for aerodynamic investigation of curtain walls Structures (IF 1.839) Pub Date : 2020-12-18 F. Rizzo; A. Franco; A. Bonati; G. Maddaloni; N. Caterino; A. Occhiuzzi
The paper investigates structural deformation of a stick curtain wall system under full-scale experimental tests. In particular, the wind-façade interaction is discussed through data given by a wind tunnel campaign. European standards for assessment of façades generally foresee to check façade air permeability and wind action resistance by applying a uniformly distributed pressure over the surface
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Kinematics of the retractable roofing module constructed from three roof panels with stiffening of the central panel Structures (IF 1.839) Pub Date : 2020-12-18 Anita Pawlak-Jakubowska; Krystyna Romaniak
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Vertical and horizontal push tests on specimens with a Trefoil decking profile Structures (IF 1.839) Pub Date : 2020-12-18 Matthew J. Russell; G. Charles Clifton; James B.P. Lim
The vertical push test has historically been the primary means used to evaluate the strength of shear connectors used in steel-concrete composite floors; however, these tests can be difficult to conduct and generally their results have been shown to not well represent the behaviour of shear connectors in a full sized composite beam. This paper describes a series of twenty-four push tests on composite
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The seismic performance of tunnel-form buildings with a non-uniform in-plan mass distribution Structures (IF 1.839) Pub Date : 2020-12-16 Vahid Mohsenian; Ali Nikkhoo; Soheil Rostamkalaee; Abdolreza S. Moghadam; Farzad Hejazi
The specific operating conditions in concrete box-type (tunnel-form) buildings would lead to the concentration of walls in the interior parts of the plan and lack of structural walls in the perimeter of the plan. In this situation, due to the considerable reduction in torsional stiffness, usually torsional vibration modes prevail over translational vibration modes, therefore the building behaves as
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Analytical study on high-speed railway track deformation under long-term bridge deformations and interlayer degradation Structures (IF 1.839) Pub Date : 2020-12-17 Hongye Gou; Rui Xie; Chang Liu; Yi Bao; Qianhui Pu
Bridges are subjected to long-term deformations in addition to deformations under design loads. In high-speed railway bridges, long-term bridge deformation and potential degradation of materials may adversely impact the operation safety and riding comfort of the railway. While a high-speed railway network is being established in China, it is significant to understand the effects of long-term bridge
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Time series estimation based on deep Learning for structural dynamic nonlinear prediction Structures (IF 1.839) Pub Date : 2020-12-17 Hong Peng; Jingwen Yan; Ying Yu; Yaozhi Luo
This paper explores state-of-the-art deep learning techniques to analyse and predict structural dynamic nonlinear behaviours in civil engineering applications. In this paper, three methods, namely the piecewise linear least squares (PLLS) method, fully connected neural network (FCNN) method, and long short-term memory neural network (LSTMNN) method, are implemented and compared for structural dynamic
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Effect of seismic isolation on random seismic response of High-Speed railway bridge based on probability density evolution method Structures (IF 1.839) Pub Date : 2020-12-17 Haiyan Li; Zhiwu Yu; Jianfeng Mao; Billie F. Spencer
In order to evaluate the effect of seismic isolation on random seismic response characteristics of a track-bridge system, in this paper, a three-dimensional detailed nonlinear dynamic model consists of rail, CRTS II slab ballastless track, high-speed railway simple supported bridges, isolated bearings, piers, pile foundations from top to bottom, is established by OpenSEES. The stochastic process of
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Structural analysis of a large aluminum alloy truss double-arch bridge Structures (IF 1.839) Pub Date : 2020-12-16 Qing-jie Wen; Zi-jian Ren
In recent years, aluminum alloy bridges have been constructed in China, but a lack of aluminum alloy design and construction standards limits their further development. Traditional concrete and steel design theory cannot be completely adopted for aluminum alloy in large bearing structures. To introduce the structural design of a two-span continuous aluminum alloy truss arch bridge, this paper describes
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A novel bionic-based substructure division method for topology optimization Structures (IF 1.839) Pub Date : 2020-12-16 Fan Zhang; Wenfeng Du; Hao Zhang
In the cantilever plate structure, traditional topology optimization cannot achieve satisfactory results since topological material always focuses on one part while the other parts occupy no or few materials. To overcome this drawback, a bionic-based substructure division method for topology optimization was proposed in this paper. In this method, The designable region of topology optimization was
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Performance of anchorage assemblies for CFRP cables under fatigue loads Structures (IF 1.839) Pub Date : 2020-12-16 Bo Feng; Xin Wang; Zhishen Wu; Yaqiang Yang; Zhihong Pan
This paper investigates the fatigue performance of CFRP (carbon fiber-reinforced polymer) cables using a bond-extrusion anchorage system in which the variable stiffness of the bonding medium in the steel sleeve is adopted. A group of cyclic loading experiments under a maximum stress of 0.45fu and a stress range from 500 MPa to 900 MPa were carried out to determine the fatigue damage evolution of the
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Modified bar-fuse damper in gusset plate detail to improve seismic behavior of bracing system Structures (IF 1.839) Pub Date : 2020-12-16 Ramin Tabatabaei Mirhosseini; Saleh Hamzeh
In this study, a cost-effective and efficient Bar-fuse damper (BFD) modified model is proposed to prevent the buckling and increase the ductility of the concentrically braced frame (CBF) along the longitudinal axis of the diagonal brace to the gusset plate. The step-by-step design of the model is presented in such a way that can dissipate seismic energy by inhibiting the brace buckling. In order to
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Experimental investigation on damage and wave propagation of PVB laminated glazing structures under impact loading Structures (IF 1.839) Pub Date : 2020-12-16 Amr A. Nassr; Tomomi Yagi; Takashi Maruyama; Gen Hayashi
Experimental investigation on the damage and wave propagation characteristics in PVB laminated glass panels subjected to impact loading was conducted. By applying different impact energies, the effect of two projectile configurations, a wooden post and steel ball, was studied. The effect of impact location was also investigated. The dynamic response of the panels was measured at different locations
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Elastic buckling analysis of plate girders stiffened with triangular cell flanges under patch loading Structures (IF 1.839) Pub Date : 2020-12-16 Carlos Graciano; Miguel González-Góez; David Orozco
This paper aims at developing an analytical expression for the buckling coefficient of steel plate girders stiffened with triangular cell flanges subjected to patch loading. In this study, buckling coefficients are computed numerically through linear buckling analysis (LBA) using the finite element method. Firstly, a numerical model for longitudinally stiffened girders subjected to patch loading is
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Novel adaptive tuned viscous inertance damper (ATVID) with adjustable inertance and damping for structural vibration control Structures (IF 1.839) Pub Date : 2020-12-15 Mohammad Ali Sadeghian; Jian Yang; Xing-er Wang; Feiliang Wang
In this study, we present an approach to alter the inertance of inerter-based devices, depending on the variation of the frequency of the external excitation. In this regard, we propose a newly developed variable inerter which is able to change the inertance using a versatile type of continuously variable transmission (CVT) mounted on a ball-screw inerter, it is called adaptive tuned viscous inertance
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Experimental investigation and pseudoelastic truss model for in-plane behavior of corrugated sandwich panels with polyurethane foam core Structures (IF 1.839) Pub Date : 2020-12-15 Ercan Yüksel; Ahmet Güllü; Hasan Özkaynak; Cihan Soydan; Arastoo Khajehdehi; Erkan Şenol; Amir Mahdi Saghayesh; Hakan Saruhan
Sandwich panels are commonly used in façades and the roofs of industrial buildings due to their well-known advantages. However, there is limited data about the in-plane behavior of the panels. Hence, this paper aimed to propose a pseudoelastic truss model to represent the effective in-plane stiffness and strength properties of the corrugated sandwich panels with a polyurethane foam core. Two separate
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Heuristic dragonfly algorithm for optimal design of truss structures with discrete variables Structures (IF 1.839) Pub Date : 2020-12-15 Farqad K.J. Jawad; Mohammed Mahmood; Dansheng Wang; Osama AL-Azzawi; Anas AL-JAMELY
The main purpose of this paper is to obtain more appropriate design for truss structures using a discrete novel nature-inspired optimization algorithm. The so-called Dragonfly Algorithm (DA) was employed to achieve the aim of this paper. The inspiration of the DA emerges from behaviors of static and dynamic swarming of dragonflies in the nature. The DA was originally developed for continuous optimization
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Seismic response evaluation of structures using discrete wavelet transform through linear analysis Structures (IF 1.839) Pub Date : 2020-12-15 Reza Kamgar; Masoud Dadkhah; Hosein Naderpour
In this article, the discrete wavelet transform (DWT) has been used to construct the wavelet response spectrum analysis (WRSA) of structures in the linear elastic zone. For this purpose, the elastic response spectra of different single degree of freedom (SDOF) systems are studied for different beam-to-column stiffness ratios. Initially, using the DWT, the records of near- and far-field earthquakes
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Geometrically nonlinear wind-induced responses of prestressed cable-suspended roof Structures (IF 1.839) Pub Date : 2020-12-15 Wuyi Sun; Qinghua Zhang
This paper presents three schemes to calculate geometrically nonlinear wind-induced responses (GNL-WIRs) of a prestressed cable-suspended roof, and intends to lay a solid foundation for the coming equivalent static wind loads. The three schemes and their associated finite element theory (FET) are first introduced. Based on a wind tunnel test, a large number of computations about the different GNL-WIRs
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Shear wall modeling with asymmetric openings by macro elements Structures (IF 1.839) Pub Date : 2020-12-15 Seyed Mohammad Reza Mortazavi; Behrouz Zaeimdar
In this study MVLEM (Multiple Vertical Line Element Model) is utilized to model a shear wall made of concrete with asymmetric openings. For this aim, an experimental RC shear wall with asymmetric openings was studied and modeled by the 3D microscopic FEM (Finite Element Method) via ABAQUS software package. To achieve a macroscopic model with a high accuracy two macroscopic shear walls were modeled
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New predictive equations for lateral-distortional buckling capacity assessment of cellular steel beams Structures (IF 1.839) Pub Date : 2020-12-15 Adel Moghbeli; Yasser Sharifi
Assessment of the ultimate capacity of the cellular steel beams subjected to the lateral-torsional buckling containing web distortion (lateral-distortional buckling) was rarely investigated. So far, there is no accurate formula to predict the lateral-distortional buckling (LDB) capacity of such members. Here, extensive simulations (660 specimens) based on the nonlinear finite element analysis (FEA)
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Experimental and analytical study on tensile performance of perfobond connector in bridge engineering application Structures (IF 1.839) Pub Date : 2020-12-13 Yangqing Liu; Haohui Xin; Yuqing Liu
In addition to general shear loading, perfobond shear connectors (PBLs) also undertake tensile uplift forces at the interfaces between steel parts and concrete components. The tensile behavior of PBLs is as significant as the shear behavior to the safety of composite bridge structures. For further evaluating the combined shear-tensile response of PBLs, it is necessary to first investigate the tensile
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Performance of timber girders with end-notch: Experimental and numerical investigation Structures (IF 1.839) Pub Date : 2020-12-13 Satheeskumar Navaratnam; Nilupa Herath; Weena Lokuge; Julian Thamboo; Keerthan Poologanathan
Many bridges built during the colonial times in Australia have timber girders as load transferring elements and they are still in service with increased traffic loads and consistent deterioration. Most of the timber girders in those bridges are notched at the ends for better seating arrangement. Therefore, it is necessary to quantify the strength characteristics of notched girders in order to ensure
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Mechanical performance of a beam with corrugated steel webs inspired by the forewing of Allomyrina dichotoma Structures (IF 1.839) Pub Date : 2020-12-13 Man Zhou; Yaying Chen; Xiaolong Su; Lin An
This study used scanning electron microscopy (SEM) to observe the internal structure of forewings from adult male Allomyrina dichotoma. The images showed that the Allomyrina dichotoma forewing is a composite sandwich structure composed of upper and lower stressed skins, a hollow core layer and an abdominal-wall layer. The core layer has an irregular honeycomb-like structure with columellae; the chitin
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Fire performance of cold-formed steel shear wall with different steel grade and thicknesses Structures (IF 1.839) Pub Date : 2020-12-13 Parisa Samiee; Shirin Esmaeili Niari; Elham Ghandi
In recent years the use of light gauge steel structures made of cold-formed steel has grown substantially around the world due to its unique advantages such as its cost effectiveness, durability, light weight and ease of use. Cold-formed steel sections have high section factor and high thermal conductivity, which result in a rapid increase in temperature during the fire, and under fire condition these
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A simplified model for inelastic seismic analysis of RC frame have shear hinge in beam-column joints Structures (IF 1.839) Pub Date : 2020-12-13 Muhammad Shoaib Khan; Abdul Basit; Naveed Ahmad
This paper presents a simplified beam-column joint modeling technique for the inelastic analysis of reinforced concrete moment-resisting frames. The joint model consists of a zero-length link element that is provided with moment-rotation lumped plasticity hinge, provided at the intersection of beam/column elements, to simulate the nonlinear shear behavior of the joint panel. The backbone of the moment-rotation
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Numerical stability analysis of arch-supported membrane roofs Structures (IF 1.839) Pub Date : 2020-12-13 Dezső Hegyi
Steel arches are widely used to support large span membrane roofs. In order to obtain a lightweight solution, these arches might be formed as a truss. Both the strength of the material and the critical load can limit the load-bearing capacity of the steel arch. Due to the out-of-plane slenderness of a large span arch, it is with utmost importance to utilize the membrane as a restraint against the buckling
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Inverse homogenization design of lattice structures without scale separation Structures (IF 1.839) Pub Date : 2020-12-13 Daicong Da
Scale separation is often assumed in most homogenization-based topology optimization (TO) frameworks for design of material microstructures. This work goes beyond the mainstream TO contributions by abandoning the scale separation hypothesis. First, it puts to evidence the limits of the homogenization-based approach when the size of the Representative Volume Element (RVE) is not negligible with respect
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Essential working characteristics of concrete-filled steel tubular arch supports discovered by modeling experimental strains Structures (IF 1.839) Pub Date : 2020-12-13 Xiaocong Yang; Jiyang Shen; Jun Shi; Guangchun Zhou
This study reveals the general working law of concrete-filled steel tubular (CFST) arch supports by exploring the experimental strain data based on structural stressing state theory. Firstly, the tested strains are transformed into the generalized strain energy density (GSED) values to model the stressing state mode and the characteristic parameters of CFST arch supports. Then, the Mann-Kendall criterion
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Life cycle analysis of cross-insulated timber panels Structures (IF 1.839) Pub Date : 2020-12-13 Pedro Santos; João R. Correia; Luís Godinho; A.M.P.G. Dias; André Dias
A sandwich wall-panel solution based on Cross-Laminated Timber (CLT) has been recently developed aiming to rationalize the wood volume and combine it with a low-density core layer for improved thermal insulation and reduced weight. Such panel, named Cross-Insulated Timber (CIT), was previously optimized to fulfil structural and thermal requirements with a minimum production cost. The layout of the
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Three-dimensional nonlinear dynamic analysis of slack cable structures using node Relaxation method Structures (IF 1.839) Pub Date : 2020-12-10 Amin Vaezzadeh; Mehdi Ahmadizadeh; Kiarash M. Dolatshahi
This study proposes a robust technique for large displacement analysis of slack cable structures subjected to dynamic loadings using a novel method, entitled Node Relaxation. Ordinary numerical methods are usually unable to analyze cable structures due to singularities arising from large displacements and rotations following any alteration of the applied loads. When dynamic loads are considered, handling
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Axial performance of GFRP composite bars and spirals in circular hollow concrete columns Structures (IF 1.839) Pub Date : 2020-12-10 Ali Raza; Babar Ali; Bilal Masood; Anees ur Rehman
The fiber reinforced polymer (FRP) bars are used in hollow concrete columns (HCCs) to alleviate the steel-reinforcement corrosion problem and to make an efficient and lightweight structure. The presented study has endeavored to numerically and theoretically explore the structural behavior of hollow concrete columns (HCCs) reinforced with glass fiber reinforced polymer (GFRP) bars and spirals. Six HCCs
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Transient temperature field analysis of steel-plate composite (SC) floor under standard fire Structures (IF 1.839) Pub Date : 2020-12-10 Chenhui Qian; Chengjun Huang; Sijia Chen; Xiaobing Song
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An analytic approach to predict the shape and internal forces of barrel vault elastic gridshells during lifting construction Structures (IF 1.839) Pub Date : 2020-12-11 Sheng Xiang; Bin Cheng; Soheila Kookalani; Jian Zhao
The barrel vault elastic gridshell is a type of spatial structure composed of long continuous solid timber or hollow GFRP members and achieves its shape from elastic deformations during the construction process of lifting or pushing. The shape forming mechanism of elastic gridshells is very complicated due to significant geometric non-linearity. This research aims to propose analytic formulations to
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A new approach for crack detection in plate structures using an integrated extended finite element and enhanced vibrating particles system optimization methods Structures (IF 1.839) Pub Date : 2020-12-11 Hamed Fathi; S.R. Hoseini Vaez; Qianyun Zhang; Amir H. Alavi
This study presents a new geometry-based crack detection approach for plate structures based on the integration of a dynamic extended finite element method (XFEM) and a physics-based optimization algorithm called enhanced vibrating particles system (EVPS). The so-called XFEM-EVPS method is applied to solve a forward problem. The problem is unraveled by applying traction loading phases and capturing
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Parametric characterization of nano-hybrid wood polymer composites using ANOVA and regression analysis Structures (IF 1.839) Pub Date : 2020-12-11 Abraham Elmushyakhi
The need to reduce waste is driving the development of new materials and technologies that support the transition of societies towards a more environmentally sustainable world. Wood-polymer composites (WPCs) can be produced by using waste products deriving from wood and plastic manufacturing industries. Enhanced mechanical and physical properties of WPCs also allow for these materials to substitute
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Experimental and numerical investigation on seismic performance of SRC variable-column exterior joints in CAP1400 NPP Structures (IF 1.839) Pub Date : 2020-12-11 Zhen-Hua Xu; Guo-Liang Bai; Jin-Quan Zhao
The experimental and numerical investigations were carried out on conventional island steam turbine workshop of Rongcheng CAP1400 steel reinforced concrete (SRC) nuclear power plant in Shandong Province as the prototype. Four SRC variable-column exterior joints with a scale of 1/4 were designed for experimentally investigated under repetitive reversed cyclic loading. The failure process, failure modes
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Application of two-stage evaluation and optimization update methods for the structural damage detection of a portal beam structure Structures (IF 1.839) Pub Date : 2020-12-11 Nien-Lung Lee
In this study, a modal-based structural damage identification method is proposed and applied to a portal beam structure as a case study. A two-stage evaluation method, involving the combination of a residual force vector method and an eigensensitivity method, is proposed to determine the locations of damaged elements in a finite element model. The physical model variables of these elements are then
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Robustness of steel truss bridges: Laboratory testing of a full-scale 21-metre bridge span Structures (IF 1.839) Pub Date : 2020-12-11 Manuel Buitrago; Elisa Bertolesi; Pedro A. Calderón; José M. Adam
This study aimed to experimentally analyse the robustness of riveted steel bridges based on truss-type structures and to define practical recommendations for early detection of local failures before they cause progressive structural collapse. Although there are many experimental studies on robustness and progressive collapse on buildings, those on bridges are either theoretical or deal with actual
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Damage detection in precast full panel building by continuous wavelet analysis analytical method Structures (IF 1.839) Pub Date : 2020-12-11 Mojtaba Hanteh; Omid Rezaifar
In this research, the free vibrations of a four-story building with specific boundary conditions have been investigated and the health of the building is monitored based on experimental results using the analytical method of continuous wavelet; then, the damage that may occur to these structures has been evaluated and analyzed. The finite element software was used to model the building by the sandwich
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