Advances in Steel Structures

recent findings in numerical, theoretical and experimental research, as well as its practical implementation in design practice in the areas of Assembled Structure, Bridge, Cold-formed Steel, Composite, Connections, Corrosion, Fracture & Collapse, Design & Analysis, Direct Analysis, Fatigue, Fire, High-Strength Steel, Impact and Protection, Intelligent Construction, New Material, Seismic Resistance, Stability, Stainless Steel, Structure Systems, Testing & Monitoring, Abstract : Wire arc additive manufacturing (WAAM) has significant potential to produce freeform, but structurally efficient geometries out of stainless steel, for use in the construction industry, however, there is currently no standardisation of the manufacturing parameters used to produce WAAM structures. This paper discusses an experimental programme carried out on WAAM 316L stainless steel plated structures to assess the effects of the deposition rate, which is directly associated with productivity. This programme comprises tensile tests on coupons extracted along different printing directions, geometric imperfection measurement (including surface roughness, waviness and overall out-of-straightness), and stub column tests designed to determine the local stability of unstiffened plates manufactured with different deposition rates. The applicability of current Eurocode design rules for stainless steel structures, including the ductility requirements and effective width equations, have been assessed based on the obtained experimental data. Abstract : Exquisite calibration of model parameter is crucial for simulation accuracy of cyclic constitutive model. This paper is aiming to clarify the influence of different calibration factors on the calibration results and simulation performances of Chaboche combined isotropic/kinematic hardening constitutive model. The influencing calibration factors include the definition of proof strength point on unloading-reloading path, the definition of unloading elastic modulus, the relative proportion of initial back stress and saturation back stress. Based upon different influencing factors, the Chaboche model parameters of LYP225 steel and Q460 steel are calibrated. Accordingly, the main cyclic behavior curves, including the hysteretic stress-strain curves, the evolutionary curves of stress amplitude and plastic work are simulated. Through analyzing the errors between experimental and simulated results, rational suggestions for the valuation of each influencing factor are provided. By taking these suggestions, the calibration of model parameters are able to yield favorable simulation performances and promising convenience for subsequent comparative studies. Abstract: As an advanced high-performance bimetallic steel, metallurgically bonded stainless-clad (SC) bimetallic steel has been increasingly used in engineering structures in recent years. Its combination use with concrete in composite structures is beneficial to not only the corrosion resistance and economy, but also to the loading capacity. However, at present, the numerical analysis model suitable for the SC bimetallic steel is still in the lack stage. In order to study the deformation and mechanical properties of concrete-filled stainless-clad bimetallic steel square tubular (CFBSST) stub columns under axial compression, two finite element (FE) models are established based on the FE software ABAQUS. The simulation results are compared and validated according to the experimental results. Finally, the advantages, disadvantages and application scope of each model are summarized to provide reference for subsequent research.