Huiyong Ban

Residual Stress Tests of High-Strength Steel Equal Angles

AbstractResidual stress is one of the most important imperfections of steel structure members because of its significant effects on buckling behavior. To quantify the residual stresses in 420-MPa high-strength steel hot-rolled equal angle sections, an experimental study was conducted by using the sectioning method. The residual stress magnitudes and distributions for 15 sections were obtained, and the effects of the width-thickness ratios were clarified. Based on the test results, it was found that the ratio between the residual stress and the steel yield strength for 420-MPa steel equal angles was much smaller than that of normal strength steel angles; however, the distribution was analogous. The residual magnitudes significantly correlated with the width-thickness ratios of the legs. In addition, calculation formulas for the residual stress magnitudes were proposed in which the width-thickness ratios of the angle legs were taken into account, and three distribution models were established to be incorpor...

Elastoplastic Cross-Sectional Behavior of Composite Beams with High-Strength Steel: Analytical Modeling

AbstractComposite steel-concrete beams that use high-strength (HS) steel sections are more sustainable from an environmental low-carbon perspective than those that use mild steel because less steel is needed. Quantifying the elastoplastic cross-sectional behavior of composite beams using HS steel sections is important because HS steel has significant differences in its plastic properties when compared with conventional mild steel. It is also important to establish this behavior in order to apply the principles of rigid plastic design. This paper develops a new analytical model for the cross-sectional analysis of HS steel-concrete composite beams to elucidate this elastoplastic response, so as to ascertain the validity of applying rigid plastic design. Both material nonlinearity and partial shear connection are incorporated in the analysis. The constitutive model for the steel is specified by using a multilinear stress-strain relationship, and that of the concrete is based on a model in terms of its axial ...

A Novel Cast Aluminum Joint for Reticulated Shell Structures: Experimental Study and Modeling

Aluminum has been increasingly used in reticulated shell structures for large span applications. The joint configuration in such space structure is essentially important for both architectural and structural performance. A novel cast aluminum joint was introduced in this paper. Full-scale specimens were examined under three loading conditions to study the mechanical performance and failure mechanism. The rotational stiffness, critical sections, and failure modes of the specimens assembled with this novel cast aluminum joint were investigated. Finite element analysis was further performed and validated by the experimental results in order to examine the local stress distributions. Based on the experimental and numerical results, it was found that out-of-plane rotational stiffness of this novel joint was larger than that of in-plane and the joint in both directions was semi-rigid according to Eurocode 3. The cross sections of the joint end and beam end with bolt holes were the critical sections. The comparison of calculated results from elastic FEA and Euler beam theory indicated that reliable safety factors should be considered if the latter is used in design, because of the stress concentration at critical sections.