桁架转换钢筋混凝土井塔结构抗震性能研究  

Study on Seismic Performance of RC Well Tower Structure with Transferring Truss

作　　者：侯俊锋[1] 陈光 苏三庆[2] 王志杰 李江 肖楚怀 HOU Junfeng;CHEN Guang;SU Sanqing;WANG Zhijie;LI Jiang;XIAO Chuhuai(School of Architecture and Civil Engineering,Xi'an University of Science and Technology,Xi'an 710054,China;School of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;China Coal Xi'an Design Engineering Co.,Ltd.,Xi'an 710054,China;China Railway 19th Bureau Group Co.,Ltd.,Beijing 100176,China)

机构地区：[1]西安科技大学建筑与土木工程学院,陕西西安710054 [2]西安建筑科技大学土木工程学院,陕西西安710055 [3]中煤西安设计工程有限责任公司,陕西西安710054 [4]中铁十九局集团轨道交通工程有限公司,北京100176

出　　处：《防灾减灾工程学报》2022年第6期1294-1303,共10页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51578449)资助。

摘　　要：为研究罕遇地震作用下桁架托柱转换井塔结构的抗震性能,通过PERFORM-3D、PKPM/SATWE与SAP2000软件,分别对某桁架托柱转换井塔结构进行了静力弹塑性分析和动力弹塑性分析。研究抽柱前后井塔结构整体和关键构件的地震响应及破坏机制,得到了在罕遇地震作用下的层间位移角、基底剪力、顶点位移、结构塑性状态过程及转换桁架、框架柱、框架梁、连梁、剪力墙的内力变化和破坏状况。结果表明:在罕遇地震作用下,抽柱后结构的动力特性变化不大,整体结构具有良好的抗震性能,最大层间位移角为4.4‰,符合规范要求;抽柱后基底剪力较抽柱前有所减小,但结构刚度满足要求;抽柱后的顶点位移略大于抽柱前的顶点位移,证明抽柱后结构的整体刚度略有降低;抽柱后屈服机制与原结构基本相同;转换桁架弯曲、剪切、轴向变形均未进入基本运行状态,具有良好的抗震性能;框架梁和连梁截面的抗剪承载力利用率变化不大,框架柱截面最大抗剪承载力利用率均值有所增大但依然满足要求,不会产生剪切脆性破坏,而剪力墙整体的抗剪承载力利用率均值偏低,建议适当减小剪力墙厚度,提高截面抗剪承载力利用率;抽柱后剪力墙扶壁柱的纤维应变发生了变化,最大拉应变小于钢筋的极限拉应变,钢筋未发生严重屈服,最大压应变小于混凝土的极限压应变。In order to study the seismic performance of a well tower structure with transferring truss under rare earthquakes,the static and dynamic elastoplastic analyses of a well tower structure with transferring truss were carried out by using PERFORM-3D,PKPM/SATWE and SAP2000 software.The seismic response and failure mechanism of the structure and its key members before and after columns removal were studied.The story displacement angle,base shear,top displacement,and plastic state process of the structure under rare earthquakes were obtained,and the internal force changes and failure conditions of the transfer truss,frame column,frame beam,coupling beam and shear wall were obtained.The results show that:under the rare earthquakes,the dynamic characteristics of the structure after columns removal change little,the overall structure has good seismic performance,the maximum inter story displacement angle is 4.4‰,which meets the requirements of the code;the base shear force after the columns removal is reduced compared with that before the columns removal,but the structural stiffness meets the requirements;the vertex displacement after the columns removal is slightly larger than that before the columns removal,proving the overall stability of the structure despite the stiffness is slightly reduced;the yield mechanism is basically the same as the original structure after columns removal;the bending,shear and axial deformation of the transfer truss do not enter the basic operation state,showing good seismic performance;the shear capacity utilization rate of the frame beam and coupling beam section changes little,and the maximum shear capacity utilization rate of the frame column section increases,but it is still in the safe range,and will not produce shear brittle fracture.It is suggested that the thickness of the shear wall should be reduced to improve the utilization ratio of shear capacity;the fiber strain of the buttress column of the shear wall changes after columns removal,and the maximum tensile strain is less than

关 键 词：井塔 抽柱 转换结构 抗震性能 弹塑性分析 

分 类 号：TU375[建筑科学—结构工程]