不规则性对基础隔震结构抗连续倒塌性能影响研究  

Effect of Irregularity on the Progressive Collapse Resistance of Base-isolated Structures

作　　者：包超[1] 张尚荣[1] 马肖彤 杜永峰[3] 张立新 BAO Chao , ZHANG Shangrong , MA Xiaotong , DU Yongfeng, ZHANG Lixin(1. School of Civil Engineering and Hydraulic Engineering, Ningxia University, Yinchuan 750021 , Ningxia, China 2. School of Civil Engineering, North Minzu University, Yinchuan 750021 , Ningxia, China 3. Institute of Earthquake Protection and Disaster Mitigation, Lanzhou University of Technology, Lanzhou 730050, Gansu, China)

机构地区：[1]宁夏大学土木与水利工程学院,宁夏银川750021 [2]北方民族大学土木工程学院,宁夏银川750021 [3]兰州理工大学防震减灾研究所,甘肃兰州730050

出　　处：《地震工程学报》2018年第3期480-489,共10页China Earthquake Engineering Journal

基　　金：国家自然科学基金项目(51608283;51778276);北方民族大学重点科研项目(2017KJ38);宁夏大学自然科学研究基金(ZR1718);宁夏回族自治区重点研发计划项目(2016KJHM126)

摘　　要：为研究基础隔震结构抗连续倒塌性能,以备用荷载路径法为基础,采用静力非线性Pushdown方法和静力线性方法对一栋典型的收进式竖向不规则钢筋混凝土基础隔震结构进行分析,从备用荷载路径的抗连续倒塌机制和需求能力比两个角度研究竖向不规则钢筋混凝土基础隔震结构的抗连续倒塌性能,为基础隔震结构抗连续倒塌设计提供参考;为进一步研究结构布置形式不规则性以及裙楼和塔楼层数变化对竖向不规则基础隔震抗连续倒塌性能的影响,分别建立塔楼布置不同、裙楼与塔楼层数变化的模型进行对比研究。研究表明:除角柱失效工况自身无法产生悬链线机制外,其余底层框架柱失效工况中备用荷载路径在整个推覆倒塌过程中均表现出明显的悬链线机制;当隔震支座失效时,由于隔震层水平刚度小,相邻支座无法提供足够的侧向约束作用而难以形成明显的悬链线机制;增加结构冗余度和备用荷载路径中参与荷载传递的构件数量可以有效提高剩余结构抗连续倒塌能力;除角柱和角支座外,隔震支座失效工况DCR值普遍大于对应位置底层框架柱失效工况,备用荷载路径中某些构件的失效风险相对较大。To study the anti-progressive collapse performance of base-isolated structures,the static nonlinear and static linear methods are used to analyze the structure of a typical vertical,irregular reinforced concrete foundation using static load method.Based on the anti-progressive collapse mechanism and the demand ability of the backup load path,the anti-progressive collapseperformance of the vertical,irregular reinforced concrete base-isolated structure was studied to provide a reference for the anti-progressive collapse design of base-isolated structures.To further study the irregularity of structural arrangements and the influence of the change of podium and tower layers on the progressive collapse of the vertical,irregular isolated structure,the corresponding models were established,and a comparative study was performed.The result shows that except for the corner column,the alternative load path showed a significant catenary mechanism in the Pushover process after the initial failure occurrence of all other columns.When the isolation bearing failed because of the small horizontal stiffness of the isolation layer,adjacent bearings could not provide sufficient lateral constraints to form a catenary mechanism.The ability of the remaining structures to resist progressive collapse can be effectively improved by increasing the structural redundancy and the number of components with alternative load paths.Except the corner column and the corner bearing the initial failure condition,the DCR value of the isolation bearing failure condition is generally larger than the value of the bottom frame failure condition at the corresponding position,and the failure risk of some components in the alternative load path of the isolation bearing failure condition was relatively large.

关 键 词：连续倒塌 竖向不规则结构 基础隔震结构 备用荷载路径法 梁机制 悬链线机制 

分 类 号：TU313.3[建筑科学—结构工程] TU352.1