考虑高阶振型影响的非自适应Pushover分析方法的研究进展

近年来,Pushover分析方法作为一种评估建筑结构抗震性能的方法得到了广泛的应用,而且已经被列入许多国家的建筑抗震设计规范之中。由于传统的Pushover分析方法存在许多不足之处,为此很多学者进行了深入的研究并提出了一系列的改进方法。本文结合模态非耦联弹塑性时程分析方法的基本理论,简述了多种考虑高阶振型影响的非自适应Pushover分析方法,并将其中一些方法的分析结果与采用非线性时程分析方法所得的结果进行比较,评价了它们的准确性,最后指出这些Pushover分析方法存在的问题和未来发展方向。

Advances in non-adaptive Pushover analysis methods addressing higher modes effects

In recent years,Pushover analysis procedure has become a favorite method for estimation seismic demands of buildings and has been employed by many countries＇ codes for seismic design of buildings. Since conventional Pushover analysis method has some drawbacks, a series of improved procedures have been investigated for seismic evaluation of structures in recent decade. In combination with the basic theory of uncoupled modal response history analysis for nonlinear structures ,the paper presents a brief review of kinds of non-adaptive Pushover analysis procedures considering the effects of higher modes. Subsequently, a comparison between estimates from some of these methods and the respective exact values obtained by nonlinear response history analysis is carried out to evaluate the accuracy of these methods. Finally, it points out their existing problems and directions for further development.