各国规范中RC框架自振周期的对比和探讨  

Comparison and comment for computing natural vibration period of RC frames in codes of some countries

作　　者：阎红霞[1,2] 杨庆山[1] 秦敬伟[1] 李明[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]河北大学建筑工程学院,河北保定071002

出　　处：《振动与冲击》2012年第11期108-113,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金杰出青年基金项目(50725826)

摘　　要：抗震设计时,框架结构的自振周期是决定其地震作用的重要因素之一。各国规范均考虑了填充墙对框架结构自振周期的折减作用,但有的考虑了填充墙布置的影响,另外一些则没有。为了能比较各国规范计算自振周期的准确性,首先归纳了国内外规范中关于框架结构自振周期的计算方法,并对有、无填充墙的两个框架自振周期的实测值和规范计算值进行了比较,结果表明考虑填充墙布置得到的自振周期较接近实测值,否则误差较大;考虑填充墙的框架有限元模型,通过对这两个框架结构自振周期的实测值和动力振型分析值的对比,验证了模型的正确性;同时采用这种建模方式,分析了填充墙的布置对框架结构自振周期的影响,并参照国外考虑填充墙布置的自振周期计算方法,为我国规范的修正提出了合理的建议。Natural vibration period of a frame is one of main factors to judge earthquake action in seismic design. The presence of infill walls can significantly reduce natural vibration periods of a frame, they are considered in codes of many countries and China. Some codes do not consider layout of infill walls. Here, computational codes of natural vibration period of a frame both domestic and abroad were summarized. The computational values and the measured ones of the fundamental vibration periods for two frames were compared, one frame had infill walls while the other without them. It was shown that the result considering the layout of infill walls is more reasonable. Then, the influence of infill walls on natural vibration period of a frame was studied using finite element dynamic analysis, its validity was verified through comparison between measured values and dynamic analysis ones. In the end, reasonable suggessions for computation of natural vibration period of a frame were put forward for revision of China codes.

关 键 词：自振周期 填充墙 框架结构 规范 有限元模型 

分 类 号：TU352[建筑科学—结构工程]