带拱式转换层高层结构弹塑性分析  

Elastoplastic analysis of high-rise buildings with arch transition floor

作　　者：张敏[1] 凌志彬[2] 

机构地区：[1]广西工学院土木建筑工程学院,广西柳州545006 [2]华东交通大学土木建筑学院,江西南昌330013

出　　处：《广西大学学报（自然科学版）》2012年第5期853-862,共10页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(50868006)

摘　　要：为了给带拱式转换层高层结构的抗震设计提供参考依据,分析了带拱式转换层高层结构地震反应的动力弹塑性性能,研究了该结构薄弱层位置以及塑性铰在结构中的分布,表明该结构若满足抗震要求,应对结构进行加强:对Ⅰ、Ⅱ、Ⅲ类场地,转换层底部柱承载力增大系数分别取1.3、1.9和2.2;而转换层相邻上部柱及转换层下弦杆跨中的承载力增大系数分别取1.25和3.5;由此采用Pushover法分析了该结构楼层最大侧移与楼层最大层间位移角,以及结构达到最大层间位移角时塑性铰分布,结果表明采用上述加强措施后该结构薄弱部位转移到上部楼层中,且该结构塑性铰分布较合理。最后,根据Pushover法对该结构进行了抗震性能评估,结果表明该结构采用上述措施加强后,能满足7度(0.15 g)设防烈度的抗震要求。The objective of the paper is to provide some basis for the seismic design of highrise buildings with arch transition floor. Based on the earthquake response of the highrise buildings, their dynamic elastoplastic characteristics were studied. The location of weak zones and the distribu tion of plastic hinges were analyzed, and the results indicated that the following reinforcement meas ures should be taken for seismic resistance ： the reinforcement coefficients of bearing capacity of the columns under the transition floor were 1.3, 1.9 and 2. 2 for sites of Ⅰ , Ⅱ and Ⅲ, respectively, and the reinforcement coefficients of the columns in the adjacent storey above the transition floor and of the midspan of the lower chord were 1.25 and 3.5, respectively. According to the aforementioned researches, the maximum lateral displacement and displacement angle of storey and the distribution of plastic hinges when the displacement angle of storey reached the maximum value were analyzed by Pushover method, and the results indicated that the weak zone transferred to the storey above the transition floor and plastic hinges were distributed more rationally after the reinforcement of the struc ture. Finally, the seismic performance of the structure was evaluated by the Pushover method, which indicated that the reinforced structure satisfied the seismic requirement of seismic precautionary in tensity of 7（0. 15 g）.

关 键 词：转换层 推覆法 塑性铰 抗震性能评估 弹塑性 

分 类 号：TU375[建筑科学—结构工程]