设置三维摩擦摆支座的北京工人体育场单层网壳罩棚竖向隔震性能研究  

Research on vertical isolation performance of lattice shell canopy with three-dimensional FPB of Beijing Workers’Stadium

作　　者：李伟 甄伟[1] 张龑华 王猛 牛奔 张磊[1] 潘鹏[4] LI Wei;ZHEN Wei;ZHANG Yanhua;WANG Meng;NIU Ben;ZHANG Lei;PAN Peng(Beijing Institute of Architectural Design,Beijing 100045,China;Beijing Construction Engineering Group,Beijing 100055,China;Zhonghe Gongti(Beijing)Commercial Operation Management Co.,Ltd,Beijing 100020,China;Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry,Tsinghua University,Beijing 100084,China)

机构地区：[1]北京市建筑设计研究院有限公司,北京100045 [2]北京建工集团有限责任公司,北京100055 [3]中赫工体(北京)商业运营管理有限公司,北京100020 [4]清华大学土木工程安全与耐久教育部重点实验室,北京100084

出　　处：《建筑结构学报》2023年第4期23-31,共9页Journal of Building Structures

基　　金：国家自然科学基金项目(52078275)。

摘　　要：北京工人体育场为设置三维摩擦摆隔震支座(3D-FPB)的大跨网壳高位隔震结构。由于三维摩擦摆隔震支座的竖向刚度远小于传统摩擦摆隔震支座,可减小竖向地震作用,并调节不同支座之间的不均匀抬升。在有限元软件ABAQUS中建立了包含3D-FPB的大跨网壳模型,可准确考虑滑块在滑动面上抬升。进行罕遇地震弹塑性时程分析,并与采用普通FPB的模型对比,结果表明:3D-FPB可以降低网壳的竖向地震作用及悬挑端竖向加速度,减小对竖向荷载敏感的网壳构件的应力水平,并使相邻支座之间的竖向作用力分布更加均匀;当考虑支座不均匀抬升效应后,上部网壳的竖向地震作用及悬挑端竖向加速度增大;网壳构件在加载过程中始终保持弹性,在承载能力方面有充足安全储备。Beijing Workers’Stadium is a large-span lattice shell structure with steel roof isolated by three-dimensional friction pendulum bearings(3D-FPB)at high position.Compared with traditional FPB,3D-FPB shows much lower stiffness in vertical direction,which can reduce vertical earthquake action and adjust uneven vertical uplift between bearings.A finite element model of isolated large-span lattice shell was established in ABAQUS,which contained 3D-FPB to simulate the uplift of slider on sphere surface.The results of elastoplastic time history analysis under rare earthquake action indicate that,compared with the same lattice shell model equipped with traditional FPB,the vertical earthquake reaction force of lattice shell equipped with 3D-FPB and vertical acceleration of overhang components are reduced.Meanwhile,the stress level of components sensitive to vertical earthquake is decreased,and the vertical force of adjacent bearings distributes more evenly.Considering the non-uniform uplift of bearings during sliding,the vertical earthquake reaction force of lattice shell and vertical acceleration of overhang components are increased.The lattice shell of this project keeps elastic during loading process,thus is associated with enough sufficient safety reserve.

关 键 词：单层网壳罩棚 三维摩擦摆隔震支座 有限元分析 竖向隔震性能 不均匀抬升 

分 类 号：TU352.11[建筑科学—结构工程] TU317.2