摘要
三维多模态pushover分析方法(即三维MPA方法)为评估不规则结构的抗震性能提供了一种简便的方法。本文以与荷载相关的Ritz(LDR)向量组代替传统三维MPA方法中的振型向量组,自动滤除了对结构反应无贡献的相关模态,从而提高了结构三维MPA方法的计算效率。另一方面,本文提出了增大除"基本模态组"之外的高阶模态对应的目标位移,以考虑被截断的高阶模态对结构反应的影响,从而改善了结构三维MPA方法的计算精度。算例结果表明,改进后的结构三维MPA方法的计算效率效率大大提高,而结构反应计算结果的准确度有了显著的改善,可用于包括不规则高层建筑结构在内的各种房屋建筑结构的抗震变形验算及抗震性能评估。
Three dimensional modal pushover analysis （3D MPA） is a simple method for evaluating the seismic performance of irregular structures. The improvements of existing 3D MPA were done and outline that. （1）the exact vibration modes were replaced by load-dependent Ritz （LDR） vectors, the lateral load patterns based on the LDR vectors were established; （2）the target displacements corresponding to high order LDR vectors were magnified to include the influence of omitted load vectors. The example shows that the improved MPA method is of notable enhancement to accuracy and efficiency, and it is applicable to seismic response analysis of irregular high-rise structures.
出处
《力学季刊》
CSCD
北大核心
2009年第3期439-444,共6页
Chinese Quarterly of Mechanics
