斜交网格外支撑超高层结构罕遇地震动力弹塑性时程分析  

Elastic-plastic Time-history Analysis of A High-rise Building with Diagonal Gird External Braces Under Rare Earthquakes

作　　者：冷斌 邓扬[2] 

机构地区：[1]江苏省建筑设计研究院有限责任公司,江苏南京210019 [2]长沙理工大学土木与建筑学院,湖南长沙410004

出　　处：《水利与建筑工程学报》2015年第6期58-64,69,共8页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金项目(51308073);湖南省自然科学基金(14JJ3087);湖南省教育厅科学研究项目(13C1017);长沙理工大学土木工程重点学科创新性项目(13ZDXK03)

摘　　要：超高层复杂建筑在罕遇地震下的结构响应分析与预测仍是结构工程领域的热点问题。以带有斜交网格桁架外支撑的框架—核心筒超高层建筑为研究对象,基于梁柱塑性铰和剪力墙纤维模型,采用MIDAS/Building软件开展罕遇地震下动力弹塑性时程分析。分析结果表明,结构层间位移角未超出规范限值;加强层位置的部分斜交网格桁架发生塑性变形,其他部位则保持弹性状态;连梁在罕遇地震作用下损伤较大,钢管混凝土柱、混凝土核心筒等抗侧力构件应变较小。研究表明结构满足"大震不倒"的设防要求,分析结果可为同类型建筑结构设计提供参考。Structural response analysis and prediction of high-rise complex buildings under rare earthquakes is still a hot topic in structural engineering. A core-wall high-rise building with diagonal gird external braces was taken as the research object in this study,elastic-plastic time-history analysis under rare earthquakes was performed by Midas Building software based on plastic hinges in the beams and shear wall fiber model. The results indicate that the largest inter-story displacement angle is smaller than the limit value defined in the code. The main part of the external braces maintains elastic while only a small part near the strengthened stories experiences plastic strain. The damage to the coupled beams is obvious under the action of rare earthquakes,while the strains of the components,which are used to resist the lateral forces including concrete-filled tubular columns and concrete core-walls,are relatively small. The results reveal that this structure can remain stable under the action of rare earthquakes and the results can be used as a reference in the design of the buildings of the same type.

关 键 词：超高层建筑 弹塑性时程分析 斜交网格支撑 纤维模型 塑性铰 

分 类 号：TU241.8[建筑科学—建筑设计及理论]