Abstract：In order to simulate the mechanical response and energy dissipation capacity of aluminium alloy structures and elements under earthquake action more accurately, a variety of loading tests were conducted on structural aluminium alloy, and the monotonic behavior and cyclic loading performance were investigated. Ramberg-Osgood model was used to fit the curve of cyclic loading, and then the key parameters of skeleton curves of three aluminium alloy materials were obtained. Based on the Chaboche plastic constitutive model, the material parameters of aluminium alloy constitutive model were calibrated according to experimental data and applied to finite element analysis, and the analysis results agreed well with the computational results. By using the user-defined material interface provided in Abaqus software, the Uniaxial Two-Surface Model Program (TSMP) was developed for analyzing the elastic-plastic process of beam elements. Eventually, the accuracy and applicability of UTSMP were verified by comparing analysis results of Abaqus with those of Chaboche model.
