摘要
本文利用有限元方法,分析了平面刚架结构对地震载荷的随机动力响应问题。一个具体算例的数值结果表明:当平面刚架结构受水平或竖向地震的单独作用时,位移的响应值均与载荷保持线性关系,但后者比前者在数值上高一至二个量级;当结构受水平和竖向地震共同作用时,位移的响应值主要决定于竖向地震的大小,只有当水平地震的强度远大于竖向地震时,才需考虑水平地震的影响;再者,正确地模拟结构的基础约束,对响应值的正确预测关系甚大。
Stochastic dynamic responses of planar rigid-frame structures to quake loads are investigated by using the finite element approach. It is revealed by the numerical results of a specific example that, when a planar rigid-frame is subjected to horizontal or vertical quake loads respec tively, linear node displacements are witnessed, those due to the latter being one or two orders higher; when the frame is subjected to horizontal and vertical quake loads in combination, the response are mainly decided by the latter, and not by the former unless the former far exceeds the latter in intensity. Moreover, base constraints of the structure have to be correctly simulated before correct predictions can be achieved for response values
