The article introduces a novel integrated moving element method (IMEM) to hydroelastic analysis of infinitely extended floating plates under moving loads in shallow water conditions. The floating plate is modeled via the Kirchhoff-Love theory, while the linearized shallow-water equation is adopted for the hydrodynamic modeling. Both computational domains of fluid and structure are concurrently discretized

Impact resistance is one of the basic properties of thin-walled coating structures that is of vast importance in the aerospace industry. Being able to absorb the energy of impact force, having resistance to puncture and being able to limit internal damage to the structure affect the continued load capacity of the component. Current aerospace designs utilize composite and hybrid materials. The work

The deformation and detachment path of simply-supported and fully clamped mild steel quadrangular plates subjected to impulsive blast loads are investigated numerically. A comprehensive failure model that incorporates two competing mechanisms of damage due to ductile and shear failure is employed to simulate the progression of tearing within the plate. The stress triaxiality dependent Modified Mohr-Coulomb

The paper proposes a carbon fiber tube reinforced polyurethane foam material (CPM). Mechanical behavior of the CPM is investigated by quasi static crushing experiment. The results show that the carbon fiber tube reinforced design can obviously improve the energy absorption and load carrying capacity of the polyurethane (PU) foam. Parameter studies show that the density of the PU foam, the number and

Due to high sensitivity to various imperfections, buckling loads of thin-walled cylindrical shells subjected to axial load vary dramatically. In order to predict lower-bound buckling loads for axially loaded cylindrical shells rationally, a probabilistic analysis approach named Probabilistic Random Perturbation Load Approach (PRPLA) is developed in this study. Firstly, a Back-Propagation Neural Network

In this paper, flexural stiffness reduction factor formulations, applicable to stainless steel members with compact cold-formed square and rectangular hollow section (SHS and RHS), are extended to account for local buckling effects and initial localized imperfection (ω). Local buckling effects and the influence of ω are accounted for by means of reducing the gross section resistance using a strength

In practice, the foundations of arch bridges or other arch structures may have non-uniform settlements leading to uneven movements or rotations of the supports of the arch. The uneven movements and rotations of the supports influence the deformations and internal forces produced by the external load as well as the in-plane non-linear instability behaviour of arches significantly. Little research is

This work aims to improve upon the aluminium impact attenuator currently used by the University of Lisbon Formula Student team through a composite solution. The influence of geometrical variations, particularly the use of curved walls, and the number of objectives considered for the optimization are studied. To perform the optimizations, Abaqus is coupled with the Direct Multisearch (DMS) algorithm

A typical fiber-reinforced polymer (FRP)-concrete-steel double-skin tubular column (DSTC) consists of an FRP outer tube, a hollow steel inner tube and an annular concrete in-fill in between. The existing studies on DSTCs in the past decade have generally confirmed the good structural performance of such column form, while it is worth noting that the possible in-ward buckling of the steel tubes in DSTCs

Thin-walled shell structures such as those used for space launch vehicles are highly sensitive to various kinds of imperfections. This imperfection sensitivity makes it challenging to predict the load carrying capacity of these structures. A correlation between the manufacturing process and the load carrying capacity, called manufacturing signature, would facilitate the design of these structures.

A type of self-lock multi-cell tubes assembled by open section components is recently proposed to serve as energy absorbing devices. Due to the open feature of the section, the self-lock tubes with large width may develop global buckling mode under axial crushing and show much worse energy absorption performances. To overcome this drawback, expanded polystyrene (EPS) foam fillers are firstly employed

The study aims to understand the effect of stacking sequence on the impact response and residual flexure characteristics of braided composite tube by combination of low-velocity impact, fracture observation and acoustic emission monitoring. Two stacking sequence configurations of braided tube in terms of [I60/O40] and [I40/O60] were designed and their low-velocity impact response and damage behavior

This paper presents a numerical investigation on the design resistance of extruded aluminum beams subjected to concentrated loads. The study is conducted through nonlinear finite element analysis considering large displacements, initial imperfection, and taking into account the strain hardening characteristics of common aluminum alloys. The numerical model is validated against experimental works taken

Most previous fire experiments of cold-formed steel (CFS) walls were conducted under ISO834 fire exposure, for which the results can not reflect the fire performance in some special scenarios. Meanwhile, full-scale fire experiments of CFS walls are time-consuming and suffer from high equipment requirements and cost. In this paper, two 1.1 m×1.1 m mid-scale non-load-bearing fire experiments and three

The effect of the number of carbon-fiber-reinforced plastic (CRFP) layers on the axial crushing capacity of aluminum–CFRP square hybrid tubes was investigated both experimentally and numerically. Increasing the number of CRFP layers led to more collapsed lobes and decreased collapsed lobe widths, resulting in an improvement of the energy absorption capacity. The simulation results revealed a distinct

Solid Expandable Tubular (SET) technology is a recent important breakthrough in petroleum exploration and drilling. The expansion forming theory and the constitutive model of the tubular materials are the theoretical basis for the development of this technology. This work focuses on establishing analytical and finite element models on the basis of the Twin Shear Stress (TSS) yield criterion to investigate

Design of multi-cell sectional configuration has been considered an effective way to enhance the crashworthiness performance of metallic thin-walled structure. Nevertheless, it remains under-studied whether this approach can achieve similar effect for fiber reinforced composite structures. Therefore, this paper aims to study the crushing responses and energy absorption behaviors of multi-cell squared

Goods and products are stored in framed systems, such as pallet racks, used for industrial and commercial activities. In the last years, pallet rack code provisions for seismic loads have been significantly improved, but there are still relevant aspects that need attention for guaranteeing a safer structural design. For example, in the current European and American standards, no indications are given

The important claim that the presence of the structural damping considerably lessens or even eliminates the effectiveness of the embedded shape memory elements in the dissipation of the vibration/impact energies of the structures, is stated and proven here for the first time. The finite-element-based governing equations of thick composite sandwich plates with homogeneous/FG soft viscoelastic cores

A 0.25-scale three-storey stacked modular steel structure with a novel slider device used at each floor level was built and subjected to seismic biaxial base excitation. This was tested in a shake table and performed well, satisfying the desired characteristics of the slider device and the modular steel structure. The test structure was then modeled and analyzed numerically, and the analysis results

The effect of polyurea coating on the structural response of metallic plates is still a challenge for the industry and scientific community. In this paper, experimental and numerical investigations were carried out to study the influence of polyurea coating as a strengthening layer on the dynamic plastic response and resistance of aluminum plates under gas detonation load. A single-stage Gas Detonation

Free axisymmetric vibrations of composite annular sandwich plates with thick isotropic core and orthotropic facings have been studied using Reddy's higher-order shear deformation theory. Core is assumed to be of uniform thickness while the face sheets are treated as membranes. Equations of motion and natural boundary conditions are developed using Hamilton's principle. Chebyshev collocation technique

This paper presents an experimental investigation of the load-carrying capacities of stainless steel hybrid tubular X-, T- and Y-joints with square braces and circular chord under monotonic loading. In total, 18 tests are reported on hybrid tubular X-, T- and Y-joints, including 9 tests on X-joints, 4 tests on T-joints and the remaining 5 tests on Y-joints. All test specimens were made from austenitic

In this study, the experiments of 800 MPa high strength steel (HSS) welded I-section columns under axial compression are performed to investigate their local buckling behavior. The effects of width-to-thickness ratio and slenderness on the local buckling load are considered. Four different buckling modes of columns (i.e., web buckling, flange buckling, web and flange buckling, and global buckling)

This paper presents an investigation into the energy absorption behaviour of splitting multiple circular tubes by theoretical, experimental and numerical methods. A theoretical solution for the steady-state crushing force of splitting multiple circular tubes is derived by applying the deformation theory. To explore the energy absorption of splitting multiple circular tubes and to validate the finite

The response of non-slender flax fibre reinforced polymer (FFRP)-skinned foam filled tubes under axial compression was investigated using 39 specimens. Different cross-ply fibre arrangements and foam densities (33–65 kg/m3) were tested; the responses were compared to hollow FFRP tubes and Glass-FRP (GFRP) skinned tubes. Although axial behaviour was not significantly affected by changing foam density

The nonlinear parametric resonance of a cantilever under axial base excitation is examined while capturing extremely large oscillation amplitudes for the first time. A geometrically exact model is developed for the cantilever based on the Euler-Bernoulli beam theory and inextensibility condition. In order to be able to capture extremely large oscillation amplitudes accurately, the equation of motion

The crumpling of aluminium alloy AA6060 T4 thin-walled tubes when subjected to axial and oblique impact is often experienced in collisions. Tubes with holes (so-called windows) and multi-cell tubes are efficient in terms of the structure's energy absorption. This paper proposes a combination of rectangular windows and multi-cell square tubes to improve the structure's crashworthiness. The advantages

The current investigation deals with the nonlinear oscillation response of conical microshells made of a composite material with functional graded (FG) in-plane heterogeneity is studied in the presence of the size dependency. To accomplish this purpose, various types of homogenization schemes including Voigt model, Reuss model, Mori-Tanaka model, and Hashin-Shtrikman bounds model are employed. The

Honeycombs based composites are applied in a wide spectrum of applications. In the present study, the performance of novel foam concrete filled auxetic aluminium honeycombs subjected to quasi-static and low velocity compression is experimentally and numerically investigated. The response mode, crushing resistance and energy absorption capacity of hollow and foam concrete filled auxetic honeycombs are

Recently, a new generation of cold-formed steel (CFS) channel sections with edge-stiffened circular holes have been developed by industry in New Zealand. No previous research, however, has considered the web crippling strength of CFS channel sections with edge-stiffened circular web holes under the interior-two-flange (ITF) loading conditions. In this paper, a combination of experimental investigation

This paper presents an investigation on the performance degradation of circular thin-walled concrete-filled steel tubular stub columns in the high-latitude offshore region. 24 specimens were loaded axially after freeze-thaw cycles and salt spray corrosion. The results show that with the increase of corrosion rate and concrete grade, the strength degradation of the specimens after the peak point becomes

The shear strength, shear distortion, failure mode, and energy absorption performance of irregular circular and box-shaped tubular column panel zones (PZs) were investigated using experimental and analytical methods on the seven steel frame structures. The main parameters include the beam height ratio of left and right beams, the column cross-section, and the configuration of external diaphragm. The

It has been shown that fire disaster normally occurs following an earthquake disaster, which might cause even more serious losses than the earthquake itself. This study investigates the post-earthquake fire performance of concrete-filled steel tube (CFST) columns. The experimental programme contains two parts - quasi-static tests and fire tests. During the quasi-static tests, the square CFST columns

This paper deals with wave propagation and vibration of a porous beam embedded via nanocomposite piezoelectric layers. Various patterns of reinforcement of the face sheets by non-uniform graphene nanoplatelets (GPLs) are considered through modified Halpin-Tsai micromechanics model to approximate the Young modulus and Poisson's ratio of graphene/piezoelectric polymer layers. The sandwich's face sheets

The Continuous Strength Method (CSM) provides accurate resistance predictions for both stocky and slender stainless steel cross-sections; in the case of the former, allowance is made for the beneficial effects of strain hardening, while for the latter, design is simplified by the avoidance of effective width calculations. Although the CSM strain limits can be used in conjunction with advanced analysis

The static stability of clamped-free columns resting on elastic foundation is investigated under a nonconservative subtangential follower force. The higher-order shear deformation beam theories are applied to treat structural instability of a clamped-free rectangular and circular beam resting on Winkler foundation. Based on Engesser's assumption, a single governing equation is derived for divergence

Considerable research progress has been made in the investigation of the structural performance of steel and composite members with round-ended oval hollow sections (ROHSs). However, few studies have focused on the joint behaviour of ROHSs, despite their advantages, i.e. high structural efficiency, excellent flow smoothness, and outstanding aesthetic appearance. This paper presents a series of experimental

The manufacturing process of cold-formed steel members induces cold work which has a significant effect on their structural performance. In order to assess this cold-working effect, residual stresses and equivalent plastic strains need to be quantified. A finite element-based method was recently proposed by the authors for predicting the coexistent residual stresses and plastic strains in cold-formed

This paper proposes a numerical and an approximate analytical method for the in-plane non-linear elastic stability of arches under the multi-pattern distributed load. There are six key parts in this paper. Firstly, the approximate analytical solution for funicular axis of arches subjected to the multi-pattern distributed load is derived from the approximations of linear elastic bending moment and horizontal

Fatigue crack propagation behaviours of Z2CND18.12N austenitic stainless steel pressurised elbow pipes were studied under cyclic bending. The results show that the evolutions of crack depth with the number of cycles at both intrados and crown present logarithmic growth, while the evolutions of crack length with the number of cycles present exponential growth. The aspect ratios of crack increment, Δ(2c)/Δa

Corrosion-induced durability has become a critical issue for aging spatial structures using steel tubes as primary load-carrying structural components. Tremendous efforts have been made in predicting the ultimate strength of steel tubes under axial compression but understanding corrosion-induced buckling remains a challenge due to uncertainty of localized defects. To experimentally investigate the

This paper aims to ex perimentally study the residual seismic resistance (RSR) of Ultra high performance cementitious composite filled steel tube (UHPCC-FST) specimen after contact explosion. Firstly, six 1/4 scaled circular UHPCC-FST were fabricated with the column height, outer diameter and core concrete compressive strength being 2000 mm, 203 mm and 131.5 MPa, respectively. Then, four of which were

With the rapid development of the offshore wind power industry, large-diameter grouted connections (GCs) with high-strength grout have become a developing trend. Previous studies on ordinary-strength and small-scale GCs may not meet current engineering needs. A numerical study was carried out to investigate how the axial mechanical properties of a large-diameter GC that has high-strength grout are

This paper investigated experimentally the progressive collapse risk of three one-third scale single story, two-bay steel frames under column-loss event. Progressive collapse was simulated by applying a vertical loading on the middle column. In these tests, three different types of steel beam-to-column connections were studied. These included: one shear-connection specimen that signified the prevalent

Layers of thin metallic sheets and fiber-reinforced composite layers bonded together is known as fiber metal laminates (FMLs). In the current study, titanium Ti–6Al–4V sheets are used with thicknesses 0.2 mm, 0.4 mm and, 0.6 mm along with layers of unidirectional glass-fiber reinforced composite to produce FMLs and the tensile response of these laminates are examined. Four different stacking sequences

Despite the awareness about the hazard gained through the past evidence, fire following an earthquake remains a predominant agent of damage to buildings and life-line structures. Often the damage caused by the subsequent fire can be more severe than the damage caused by the ground motion itself. Concrete filled double skin tube (CFDST) columns as a special composite structure are particularly prone

In the present study, for investigating the elasto-up to yielding behavior of a piezoelectric functionally graded cylindrical panel with simply supported boundary conditions subjected to electro-mechanical loads, a three-dimensional full layer-wise theory is employed. The material properties of the panel based on a power-law function change continuously through the thickness of the panel. The trigonometric

Voids behind linings are a typical problem in the majority of operational tunnels. Previous researches had pointed out a high correlation between the voids and tunnel damages. However, mainly single tunnels have been investigated so far. In fact, few studies focused on the cracking performance of asymmetric double-arch tunnels originating from the relative radial displacements around the void. Herein

Offshore pipelines under both installation and operation are always subjected to tension and torsion. The corrosion causes pipes to be cracked and then collapsed. Therefore, in order to obtain the fracture behavior of pipelines, the modified Mohr-Coulomb (MMC) criterion is applied. By using this criterion, a 3D elastic-plastic finite element model in ABAQUS is established to simulate the mechanical

This study presents the experimental and numerical investigation of the response of hemispherical sandwich shell structure having hexagonal honeycomb core against ogive nosed projectile impact. Aluminum AA-1100 was considered for the front and rear face sheet of 200 and 160 mm diameter whereas AA-3003H19 was used for the honeycomb core of 3.2 mm cell size, 0.05 mm cell wall thickness and 20 mm core

In the present study crashworthiness performance of monolithic and co-axial multi-wall (double, triple, and four layered) frusta tube structures was investigated under the quasi-static axial loading. The developed layered frusta tubular structures having a total equivalent thickness of 2.3 mm were made of aluminium alloy AA-1080 sheet. A series of layered configurations were simulated and analysed

The governing differential equations of thin-walled laminated composite curved beams are derived from the principle of virtual displacement. Curvature effect is fully considered, and various displacement components of curved beams are coupled. Buckling behaviors of both the laminated composite I-section vertically (with horizontal web) and horizontally (with vertical web) curved beams are studied.

This paper presents an experimental and theoretical study on the deformation of small diameter aluminum alloy (AA6063T5) circular tubes under lateral impact loading. Seven specimens classified as three groups were investigated by the drop weight test. The patterns and extent of damage between specimens were compared and discussed. Moreover, the experimental results show that the performance of specimens

Cold-formed steels are replacing conventional building materials in many building applications due to the many benefits including lightweight and low cost of construction. Recent research has focused on the fire resistance of cold-formed steel (CFS) construction at material and member levels and advanced the knowledge of their fire performance significantly. However, the performance of CFS members

Seismic stability of single-layer dome structures is closely related to both the external seismic ground motions and structural properties. The physical mechanism of seismic instability of single-layer reticulated dome structures is investigated from the perspective of energy, which can take into account both the external excitations and structural properties. First, the energy balance equation is

This paper presents experimental and numerical investigations about the transverse bending and in-plane shear behaviours of pultruded bridge deck panels made of E-glass fiber reinforced polymer (GFRP). The analysed panels have a wide multicellular thin-walled cross-section, with panel-to-panel vertical interlocks (snap-fit) at the lateral edges. The study aimed at understanding and quantifying the