钢筋混凝土框架结构超强研究  

Study on overstrength of RC frame structures

作　　者：翟长海[1] 谢礼立[1] 

机构地区：[1]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090

出　　处：《建筑结构学报》2007年第1期101-106,共6页Journal of Building Structures

基　　金：国家自然科学基金资助项目(50608024;50538050);高等学校博士学科点专项科研基金(20030213042);黑龙江省自然科学重点基金资助项目(ZJG03-03)

摘　　要：结构超强对结构在强烈地震中保持良好的性能具有重要的作用。本文首先给出了严格按我国抗震规范设计的几个典型钢筋混凝土框架结构,用大量经过筛选的地震动记录,分别利用动力时程分析法和Pushover方法确定了结构的整体能力曲线,并研究了结构在非弹性阶段由于内力重分布而形成的超强,得出结论:利用时程分析法建立结构的整体能力曲线时,地震动记录的场地条件对结构的能力曲线影响不大;动力时程分析法和Pushover方法给出的超强的差别随层数的增多而增加;在还没有进行大量细致的工作和研究之前,可以保守地认为严格按我国抗震规范设计的钢筋混凝土框架结构的超强系数最小值为2。Overstrength plays an important role in keeping satisfactory performance of structures during strong earthquake. Using a number of ground motions and the RC frame structures designed according to Chinese seismic code, the global capacity envelopes and overstrength of RC frame structures attributing to redistribution of intemal forces are studied by means of incremental dynamics analysis and Pushover analysis. It is concluded that when using incremental dynamic analysis to determine the global capacity envelopes of structures, the difference between the capacity envelopes caused by different local site conditions is small. And the difference between the overstrength obtained from incremental dynamics analysis and Pushover analysis increases with the stories. Before further detailed investigations, it can be conservatively considered that the minimum overstrength factor of RC frame structures, which are designed according to Chinese seismic code, is 2.

关 键 词：结构超强 钢筋混凝土框架结构 动力时程分析法 PUSHOVER方法 内力重分布 合理建议值 

分 类 号：TU375.4[建筑科学—结构工程] TU352.11