基于极限平衡理论的钢与混凝土组合框架结构抗震分析

基于极限平衡理论建立一种钢与混凝土组合框架结构罕遇地震作用时简化分析方法。通过理论分析和试验现象，确定组合框架破坏机制；基于极限平衡原理，根据结构在地震作用下达到极限状态时变形和内力分布规律，分别计算框架顶部侧移等于H/50、H/40和极限荷载对应侧移值时组合框架抗震强度，计算结果与国内外十九榀组合框架低周反复荷载试验结果吻合较好，说明此计算方法可有效地预测组合框架结构在罕遇地震下的抗震强度；提出通过对组合框架变形能力和抗震强度同时进行控制，以使结构满足罕遇地震下抗震要求的简化方法。

SEISMIC ANALYSIS OF STEEL-CONCRETE COMPOSITE FRAME STRUCTURES BASED ON THE ULTIMATE BALANCE THEORY

A simplified analysis method of steel-concrete composite frame structures under rare earthquake action is established based on the ultimate balance theory. The failure mechanism of composite frames is determined by theoretical analysis and experimental phenomena. Based on the ultimate balance theory and according to the distribution law of the deformation and internal force when the structure reaches the ultimate strength under earthquake action, the seismic strength of the composite frames is calculated when the top horizontal displacement of the frame is equal to H/50, H/40 and the lateral displacement corresponding to the limit load. The calculation results agree well with the low cyclic loading test results of 19 composite frames at home and abroad. It shows that the method can effectively predict the seismic strength of composite frame structures under rare earthquakes. A simplified method is proposed to control the deformation capacity and seismic strength of the composite frame at the same time to make the structure meet the seismic requirement under rare earthquakes.