焦  柯，  吴桂广，  赖鸿立，  赵云龙

(广东省建筑设计研究院，广州510010)

 

[摘要] 针对建筑结构弹塑性分析软件在抗震设计中存在的一些问题进行分析讨论。比较了梁柱构件采用纤维束单元与塑性铰单元进行计算的差异。采用不同加载模式下静力推覆分析结果差异较大，建议采用给定水平力加载模式计算。当结构第一振型参与质量大于70%，推覆分析与时程分析结果比较接近。对存在明显软弱层的高层结构进行推覆分析，软弱层的位移角结果偏大，此类结构建议采用时程分析。时程分析中不宜通过增加峰值加速度或放大地震力方法来满足规范选波要求，宜通过地震波修正软件选波。分析了造成弹塑性分析模型与弹性设计模型不一致的几个因素。

[关键词] 弹塑性分析软件；推覆分析；时程分析；地震波；加载模式

中图分类号：TU973 +.2    文献标识码：A  文章编号：1002-848X(2012) S2-0197-05

 

Jiao Ke, Wu Guiguang, Lai Hongli, Zhao Yunlong

( The Arclutectural Design and Research Institute of Guangdong Province,  Guangzhou 510010,  China)

 

Abstract: Some practical problems about elasto-plastic analysis software for building structures were discussed. The differences between fiber bundle model and plastic hinge model of beam element had been compared. The results of different load pattems by push-over analysis are great different, and the given horizontal force pattern is suitable.  Push-over analysis should be used on building structures which first modal participation mass is more than 70% of the total mass.  Story drifts of the lugh-rise structures owrung obvious weak layer by push-over analysis are bigger than story drifts by time-lustory analysis, and the later is suggested to use for that kind of structures. In time-history analysis, artificially increasing peak acceleration or the seismic force to meet the requirements of the codes are not suitable, using the corrected software of seismic waves is a better choice. The factors that give rise to differences between elasto-plastic model and elastic model were analyzed.

Keywords: elasto-plastic analysis software; push-over; time history analysis; seismic waves; load pattems