Application of sectional yield surface of axial force and bending moment to dynamic elastoplastic analyses of steel frame structures
Chen Yongsheng1,2 Zhang Lingxin1,2 Liu Jieping1,2
1. Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China
2. Key Laboratory of Earthquake Engineering and Engineering Vibration of China Earthquake Administration, Harbin 150080, China
Abstract：In order to consider axial-flexure interaction under current codes, and to balance computational accuracy and efficiency, a new application of sectional yield surface to dynamic elastoplastic analysis of steel frame structures is studied. First of all, yield surface of section axial force and bending moment was formed by section assemblage concept. Secondly, sectional restoring force model (RFM) was established based on classical plastic theory, and the section state determination was introduced. Thirdly, the element state determination invoking the sectional RFM was illustrated. Finally, dynamic elastoplastic analysis of a 4-storey 2-span steel frame was implemented based on alpha-OS integration method. The results show that the sectional yield surface can well account for the effect of existence and variance of axial force on the sectional bending moment capacity. Besides, it can be concluded that the computational accuracy of proposed sectional RFM is better than plastic hinge model while the efficiency is higher than fiber model.
陈永盛 张令心 刘洁平. 截面轴力与弯矩屈服面在钢框架动力弹塑性分析中的应用[J]. 土木工程学报, 2016, 49(S2): 57-62.
Chen Yongsheng Zhang Lingxin Liu Jieping. Application of sectional yield surface of axial force and bending moment to dynamic elastoplastic analyses of steel frame structures. 土木工程学报, 2016, 49(S2): 57-62.
