This study investigates the tensile properties of bolted connections for aluminum alloy plates from room temperature to 400 °C through elevated-temperature tensile tests of 30 single- and 24 multiple-bolted connections. Accordingly, the failure modes and tensile bearing capacity are defined at different temperatures. Then, ABAQUS is used to establish the finite element models of bolted connections

Graded core sandwich structures have great potential for designing and optimization under special requirement. In the present work, the dynamic response of clamped square sandwich panel (SP) with layered-gradient metal foam core subjected to blast loading was investigated. A new yield criterion of SP with three-layer metal foam core was proposed, and the analytical solutions for maximum deflection

As a crucial component of the spent fuel, the stainless steel thin-walled tube would be cut into segments with dozens of millimeters in length during the closed fuel cycle. The high ductility and malleability of the stainless steel material bring great challenges to shear tools. Thus, it is worthwhile to investigate the tube shearing process. However, currently, few research has involved the tube shearing

This paper examines the buckling behaviour of unstiffened mild steel cone-cylinder assembly under (i) axial compression and (ii) combined loading (i.e., axial compression and external pressure). Experimental results on ten (10) laboratory scaled axially compressed cone-cylinder models and their accompanying numerical predictions of collapse load are provided. The tested models are assumed to have the

Concrete-filled double skin steel tubular (CFDST) columns with galvanized corrugated steel tubes are a novel type of composite members. Such column consists of a layer of concrete sandwiched between an outer corrugated steel tube and an inner flat or a corrugated steel tube. It is expected to combine the advantages of each component, and have additional advantages in corrosion resistance, local stability

In this paper a new virtual process chain is presented that allows a fast mechanical characterization of foldcores under flatwise compression. The aim is to find the best possible folded configuration with limited overall geometry dimensions providing highest mechanical properties for strength and stiffness under compressive loading. For this purpose an optimization method using the finite element

This article deals with the static bending response of a functionally graded polymer composite (FG-PC) curved beam reinforced with carbon nanotubes (CNTs) subjected to sinusoidal and uniform loads. The effective material properties of beam are approximated according to modified rule of mixture. Four types of CNT distribution are also considered. Assuming Timoshenko beam theory and a higher-order strain

An expression for cross-sectional bending capacity prediction curve is proposed in this study based on the Direct-Strength-Method (DSM) approach using a comprehensive data from the literature on structural carbon steel Circular-Hollow-Sections (CHSs). Later, according to the Equivalent-Resistance-Capacity-Method (ERCM), improved empirical expressions for the equivalent CHS diameter of Elliptical-Hollow-Section

A model considering slip and shear-lag for the dynamic analysis of a coupled steel-concrete composite bridge-train system is proposed in this paper, based on the finite element method and Euler-Bernoulli theory. The stiffness matrix, damping matrix, mass matrix, wheel-rail contact force matrix and the equations of motion of the coupled system considering slip and shear-lag are derived based on energy

We revisit some existing time-stepping schemes for structural dynamics with the algorithmic dissipation that fall either into the class of generalized-α methods or into the class of energy-decaying (and momentum-conserving) methods. Some of the considered schemes are designed for the second-order and some for the first-order form of the differential equations of motion. We perform a comparison (for

The target of this research is to investigate the influence of manufacturing technique and autoclaving process parameters on the buckling and post-buckling behaviour of thin-walled, GFRP laminates. We investigated the compression of channel cross-section profiles with the following dimensions of the inner perimeter: (web × flange × length of the profile): 80 mm × 38 mm × 240 mm. The nominal wall thickness

This paper is concerned with the effect of variation in temperature and moisture concentration on free vibration response of skew laminated hybrid composite and sandwich plates. The coupled thermo-elastic and hygro-elastic finite element model is formulated using the first-order shear deformation theory (FSDT). Uniform temperature and moisture concentration rise is considered for the analysis. Soft-core

Based on cracking inspection on an orthotropic steel bridge, stress behaviors and fatigue life at cutout detail are investigated through field measurement and multi-level FEM modelling. Research finds that fatigue cracks at cutout detail are highly related to wheel path. Biaxial compression at cutout detail implies high residual stress and it suffers severe out-of-plane distortion. Fatigue life can

Robust and pre-fabrication construction techniques are the cutting edge practice in the building industry. Cold-frame, warm-frame and hybrid-frame are three common Light-gauge Steel Frame (LSF) wall constructions applied for better energy performance. Still, the applications of the aforementioned wall configurations are restricted due to limited fire safety studies. This paper presents the fire performance

A novel method for the spatial discretization of two-dimensional domains is derived and applied to the problem of free vibrations of singly curved shells. This new method utilizes a tensor product of two independent families of lines to discretize the geometry and kinematics of a surface. The first family consists of NURBS functions which are implemented in agreement with the isogeometric approach

Flexoelectricity is a size-dependent phenomenon which gives an electric response to the inhomogeneous strain in centrosymmetric as well as non-centrosymmetric crystalline materials. In this novel work, an analytical model was developed for the elastic shell laminated with flexoelectric graphene-based composite layer based on Kirchhoff–Love theory considering both piezoelectric and flexoelectric effects

This paper presents the analytical process of the functionally graded porous (FGP) arch structure in an elevated thermal field. The FGP arch is reinforced by graphene platelets (GPLs). Analytical expressions are used to illustrate the distribution of the pores and GPLs in the cross profile. A small crown dent is considered by introducing a small point load on the crown portion. The nonlinear thin-walled

To achieve a damage-controllable and earthquake-resilient steel frame with more feasible and simple dissipative devices, an innovative steel moment-resisting connection with bolted ductile double T-stub fuses is developed in this work. These T-stubs with appropriate free deformation length in the stems, made of Low-Yield-Point (LYP) steels instead of ordinary steels, simultaneously behave as connectors

Cylindrical shells are commonly used in the industry structures, and they are prone to buckling under axial compression load. However, the practical critical loads are often lower than the theoretical value of buckling load due to the presence of imperfections. In this paper, an incomplete reduced stiffness method (iRSM) is proposed to perform the imperfection sensitivity analysis of cylindrical shells

In this paper, the buckling performance of curvilinearly grid-stiffened variable-stiffness composite cylindrically curved panels subjected to in-plane compressive loads under different boundary conditions is addressed. A Python-Abaqus script is developed to perform the buckling analysis of the panels. A novel planar mesh wrapping based approach is proposed to ease modelling of such curved panels with

The stability of functionally graded porous plates with graphene platelets reinforcement (FGP-GPLs) is investigated in this paper. Combining with a new metamodeling approach, namely the Kriging enhanced Neural Network, a stochastic isogeometric analysis (SIGA) framework is proposed for assessing the structural stability. The uncertainties of material properties of both FGP matrix and graphene platelets

Two analytical models are developed to predict the load-bearing capacity of a beam-to-column joint inside a slim-floor composite frame. The load inside the joint is transferred mainly by a steel console welded to a concrete-filled steel column. Because of the asymmetric nature of plastic collapse mechanism of the steel console, a two-parameter model is developed in two mechanisms: a mechanism excluding

In hygrothermal environment, vibration study of a simply supported smart sandwich plate embedded in an elastic substrate medium is presented in the present article. The sandwich plate contains layers of fiber-reinforced and magnetostrictive materials and core of viscoelastic material. The kinematic equations system is derived via employing Hamilton's principle with considering the transverse shear

High-strength steels (HSSs) are now used globally in different structural applications. Nevertheless, investigations on HSS elements are still rare. Herein, the shear buckling response of S690 steel plate girders with corrugated webs (CWGs) is explored. This is based on virtual tests, generated by finite element (FE) modelling, that well simulate their actual behaviour. Accordingly, S690 material model

To investigate the collapse behavior of steel frames under the random earthquake, it is essential to grasp the hysteretic behavior of beam members. However, in the large-deformation region, the behavior of beams is difficult to be captured precisely because of the local buckling of the flange plate and the web plate. This paper presents a method to obtain the monotonic curve and the hysteretic curve

Herein, several approaches with the aim of improving the crashworthiness performance of expanded metal tubes were assessed experimentally and numerically. In this regard, various expanded metal tubes were produced out of expanded metal sheets including expanded metal tubes, stiffened expanded metal tubes, foam-filled expanded metal tubes and multi-layered expanded metal tubes. Their crashworthiness

The buckling and collapse behaviors of a cracked thin steel panel subjected to sequential tensile and compressive loading were investigated. An experimental apparatus was developed. Three different test specimens were employed, i.e., an intact panel and cracked panels with different crack lengths. The load-displacement curve and crack opening displacement (COD) were measured during the loading. The

In order to study the wind-induced performance of super-large steel structure cooling towers, a super-large hyperbolic 216.3m-high cooling tower comprising a double-layer steel-truss structure with steel-sheet cladding was taken as a case study. The dynamic characteristics of this cooling tower were analyzed and compared with those of a similar-scale reinforced concrete cooling tower. Then, fluctuating

Bidirectional self-locked structure has important significance in energy absorption protection, especially complex loading absorbing energy. This paper reports on the lateral crushing behavior of novel carbon fiber/epoxy composite bidirectional self-locked thin-walled tubular structure (BST) and system (BSTS), as well as some improved bidirectional self-locked thin-walled tubular structures and systems

This paper describes a test program on the stress concentration factors (SCFs) of stainless steel hybrid tubular (SSHT) joints with square hollow section (SHS) braces and circular hollow section (CHS) chord and SSHT joints with CHS braces and SHS chord. The load was applied to the brace for all test specimens. Twenty specimens in total, including ten overlapped and ten gapped tubular K-joints, were

The paper presents a combined experimental and numerical investigation of the bending response of lap welded joints in pressurized steel water pipelines. It is motivated by the structural performance of large-diameter steel pipelines used for water transmission in seismic and geohazard areas, where the pipeline may be subjected to severe permanent ground-induced actions. A series of large-scale four-point

This paper presents an adaptive hierarchical optimization approach to optimize the lamination parameter distribution of variable-stiffness laminated plate with truncated hierarchical B-Splines. Traditional methods use a uniform grid to design the distribution though its variation rate could change dramatically from point to point. As a consequence, the dense grid incurs a high computation cost while

In this study, the material and stability of 10 axial compression aluminum alloy columns are systematically tested at five temperatures. The material grade of the aluminum alloy used in the tests is 6082-T6. The experimental results demonstrate that flexural buckling occurs in all the column specimens under different temperature environments. A finite element (FE) model of the experiment is established

Hybrid cold-formed steel (CFS) wall panel, composed of square hollow sections (SHS) and CFS open sections, can offer some great advantages with respect to the lateral performance of light steel frames, in particular for applications in mid-rise construction. This paper presents non-linear finite element modelling of hybrid wall panels, calibrated through experimental tests, and their applications to

This paper presents the study on crushing response of functionally stepwise graded foam under quasi-static and dynamic compression using three-dimensional (3D) Voronoi model. A series of simulations is conducted to acquire proper computing parameters and to validate the predictability of numerical model by comparing with experiment results. Two different strategies are proposed to achieve the gradient

The powder fed friction stir process (FFSP) is a new and attractive solid-state manufacturing technique that enables the fabrication of polymer matrix nanocomposites (PNC). Herein, we present the fabrication of polycarbonate (PC)-based nanocomposites by in-situ injection of colloidal alumina nanoparticles (<100 nm) into the plasticized polymer under stir friction of a steel tool. Microstructural features

In this paper, the extended higher-order sandwich plate's theory (EHSAPT) is used to analyze the free vibration of the sandwich plate with compressible core and different boundary conditions in contact with fluid. First-order shear deformation theory is adopted for the top and bottom face sheets, while the in-plane and transverse displacements of the core are considered to be cubic and quadratic functions

In this paper, the influence of strain-hardening on the ultimate behaviour of aluminium beams made of rectangular hollow sections (RHS) and subjected to non-uniform bending is investigated by analysing different aluminium alloys. The strain-hardening behaviour is related to the Ramberg-Osgood exponent of the constitutive stress-strain law of the material. A wide parametric analysis has been accomplished

Aged marine structural analysis often relies on simplified corrosion modelling. Empirical or statistical methods are used to predict a uniform thickness reduction over time. Although convenient, this approach cannot incorporate the corrosion evolution or the rough surfaces in the damaged area. This is fundamentally due to the lack of representation of the underlying corrosion mechanisms in service

Any research and development of the analysis methods, theoretical or numerical ones, for evaluating hull girder's ultimate torsional strength must be based on a thorough understanding of the torsional collapse behaviors of the hull girder, especially for the warping and shear characteristics involved in hull girder's torsional collapse process. In this paper, firstly, the torsional collapse behaviors

Deployable coilable booms are extendible structures that have been used in a number of space and terrestrial applications. Fiber reinforced polymer (FRP) composite variants of these deployable booms have advantages over the metallic versions in the form of higher specific stiffness and greater design flexibility. A deployment failure mode called ‘blossoming’, in which the boom unwinds and extends within

A grouted connection (GC) is critical to the transfer of combined axial force and bending moment from an upper tower to a substructure. Meanwhile, the increasing offshore wind turbine capacities and deeper pile foundation locations require robust connection structures. However, it is difficult to completely test the stress in GCs through experiments. So, in this paper, a numerical approach combined

Beams are structural components that are mainly utilized to resist flexure. However, beam sections are also commonly used to resist axial tension and compression in certain situations such as when they are used as truss members or braces. Pretwisting compression members strengthens their weak flexural plane and weakens their strong flexural plane, leading to an overall improvement in the buckling capacity

This study investigates the cutting response of AL3003H18 hexagonal honeycombs loaded with vertical array blades. Quasi-static cutting tests were performed on aluminum honeycombs of various cell sizes and the same single-walled thickness (0.04 mm) using five groups of parallel steel blades of thickness 0.24 mm. The deformation mechanism was numerically simulated in the explicit solver LS-DYNA. In addition

Optimal design of a structural member is a design process of selecting alternative forms to obtain its maximum strength while maintaining the same weight, leading to the most economical and efficient structure. Amongst steel structures, cold rolled steel ones can effectively gain this requirement as they are thin-walled structures that offer the high ratio of strength over weight. However, the design

This study presents the first ever investigation aimed at accurate numerical modelling of the behavior of hybrid fibre reinforced polymer (FRP)-timber laminated (HFT) Cee section columns under axial compression. Existing numerical modelling approaches for modelling thin-walled structural members, such as modelling using composite laminate shell elements, orthotropic laminate shell elements with experimentally

The free flexural vibration of thin-walled honeycomb sandwich cylindrical shell was investigated by experiments and Flügge's shell theory simulations. The natural frequencies were measured and compared with simulations three-dimensional model. In the simulation analysis, the porous honeycomb core is simplified as a homogeneous orthotropic material, and its equivalent material properties are determined

Dual-angle cross combined section columns (starred angles) have been extensively utilised as transmission tower legs because of their large bearing capacity. However, combined members may fail in different modes, and the provisions on bearing capacity in the regulations of different countries are diverse. To overcome the limitations of existing research and design approaches, a three-dimensional finite

The minor-axis flexural buckling behaviour and strengths of pin-ended press-braked stainless steel channel section columns have been investigated in the present paper through laboratory testing and numerical modelling. An experimental programme was firstly conducted, and included initial global and local geometric imperfection measurements and twelve pin-ended column tests about the minor principal

Cold-formed steel (CFS) channel beams are an increasingly popular choice as load-carrying members in building structures. Such channel beams often include web holes for installation of services. Traditional web holes are normally punched and are un-stiffened. This can restrict the size and spacing of web holes. Recently, a new generation of CFS channel beams with edge-stiffened web holes has been developed

This paper presents an investigation into the mechanical properties of ultra-high strength steels (UHSSs) (with nominal yield stress of 960 and 1100 MPa) after welding. Seven weld thermal cycles were simulated using a Gleeble 3800 thermal-mechanical machine. These cycles represented the temperature-time history of the joint at various distances from the weld fusion line (FL) in a typical gas metal

Assembling sandwich serpentine structures with soft functional materials creates an effective way to high-performance stretchable devices. In order to achieve better design criteria for the application of serpentine-shaped stretchable systems, this paper explores the mechanics governing the deformation mechanisms of the sandwich serpentine structures. Firstly, detailed three-dimensional (3-D) numerical

Fuel economy and stringent environmental regulations have forced the automotive industry to adopt lightweight materials for car bodies. Utilization of multi-materials is an effective approach for lightweight design of the automotive body structure. Introducing such lightweighting solutions faces the automotive industry with challenges in terms of joining methods. Clinching is a cost-effective alternative

The current study focus on the multi-phase Shear thickening fluid (STF) treated high-strength fabrics which is an promising material for soft-wall containment casing. Three types of multi-phase STF were manufactured by adding graphene oxide (GO) and carbon nanotubes (CNTs) to a nanosilica suspension system. Steady rheological property tests and yarn pull-out tests were conducted to determine the shear