子结构拟动力试验边界条件模拟方法

针对框架结构体系研究了基于有限元软件OpenSEES的子结构拟动力试验方法.以单层单跨钢框架为例进行了3种不同边界条件模拟方案下的子结构拟动力试验,其中严格边界条件下的试验结果与整体结构时程分析结果完全吻合,表明了该方法的正确性.在此基础上,针对单层、5层与8层3个四跨钢筋混凝土框架,采用杆系模型进行3种不同边界条件模拟方案下的子结构拟动力试验.试验结果表明,仅考虑水平位移边界条件时对试验子结构柱的滞回曲线模拟误差较大,同时考虑水平位移与转角边界条件则能很好地模拟试验子结构柱的滞回曲线.各种简化边界条件对基底剪力影响较小,而对底层水平位移的影响则基本可以忽略.研究结果可以为子结构拟动力试验方案设计提供参考.

Boundary Condition Simulation Method of Substructure Pseudo-dynamic Test

Based on the finite element analysis software OpenSEES, substructure pseudo-dynamic test (PDT) method for frame structures was investigated. Substructure PDTs of a one-story one-bay steel frame was conducted, in which three different kinds of boundary conditions were simulated. The correctness of the PDT method was demonstrated by the agreement between the test results with complete boundary condition and time history analysis results. For one-story, five-story, and eight-story four-bay reinforced concrete frames, substructure PDTs were also conducted with three different kinds of boundary conditions. The considerable discrepancy between the test and simulation results occurs in hysteresis curve of substructure columns when only horizontal displacement boundary condition was simulated. The simulation accuracy of the hysteresis curve of substructure columns can be improved when both the horizontal displacement and rotation boundary conditions are considered. The base shear was much less affected by using simplified boundary condition, while its effect on first story drift can be ignored. The results can be used for the design of substructure pseudo-dynamic tests.