大跨度屋盖隔震结构动力响应与减震效果研究  

Dynamic response and seismic isolation effect of large-span roof-isolated structures

作　　者：邱意坤 李纪影 牛奔 张龑华 李伟 王轶 甄伟 盛平 QIU Yikun;LI Jiying;NIU Ben;ZHANG Yanhua;LI Wei;WANG Yi;ZHEN Wei;SHENG Ping(Beijing Institute of Architectural Design(Group)Co.,Ltd,Beijing 100045,China;School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Sinobo Gongti(Beijing)Commercial Operation Management Co.,Ltd,Beijing 100020,China)

机构地区：[1]北京市建筑设计研究院股份有限公司,北京100045 [2]北京建筑大学土木与交通工程学院,北京100044 [3]中赫工体(北京)商业运营管理有限公司,北京100020

出　　处：《建筑结构学报》2025年第3期12-23,共12页Journal of Building Structures

基　　金：北京市科技计划课题(Z221100005222009)。

摘　　要：通常,大跨度屋盖隔震结构体系的隔震层位置高、屋盖质量轻。为研究大跨度屋盖隔震结构动力响应与减震效果,从大跨度屋盖隔震结构动力特征角度,揭示屋盖隔震结构减震机理,基于两质点模型对隔震层上下结构的质量比、频率比和阻尼比等关键参数提出设计建议;使用OpenSees程序建立多自由度集中质量模型,研究结构层间位移角、楼层加速度、基底剪力变化规律;以北京工人体育场结构为对象,对比了屋盖铰接和屋盖隔震两种方案的结构动力响应。结果表明:隔震后屋盖减震系数约为0.3,体育场下部结构层间位移角与楼层剪力均会减小,但是基底剪力会增大6%左右;针对大跨度屋盖隔震对地震动特征敏感特性,研究了17种地震动强度指标与大跨度屋盖隔震结构响应之间的有效性,提出一种考虑隔震上下层质量比的地震动强度指标,可减小选波差异带来的响应离散性,适用于大跨度屋盖隔震结构抗震设计。Large-span roof isolation structural systems have a high position of the isolation layer and a lightweight roof.From the perspective of dynamic characteristics of large-span roof isolation structures,the damping mechanism of roof isolation structures was revealed.Design recommendations were proposed in terms of the key parameters such as mass ratio,frequency ratio,and damping ratio between the upper and lower structures of the isolation layer using a two-mass model.A multi-degree-of-freedom lumped mass model was established using the OPENSEES program to study the rule of change of the displacement angle between structural layers,floor accelerations,and base shear variations between the roof and lower structure.Taking the Beijing Workers Stadium structure as an example,structural dynamic responses were compared among three schemes:equivalent roof mass,hinged roof,and roof isolation.The results show that with roof isolation,the seismic absorption coefficient of the roof is about O.3,and the interstory drift ratio and floor shear force of the stadium substructure decreases,but the base shear force increases by about 6%.From the perspective of seismic sensitivity of large-span roof isolation to seismic characteristics,the adequacies between 17 seismic intensity indices and the structural responses of large-span roof isolation structures were studied.A seismic intensity index considering the mass ratio between upper and lower isolation layers was proposed,which can reduce the response dispersion caused by variations in the selected ground motions,and thus was suitable for seismic design of large-span roof isolation structures.

关 键 词：大跨度屋盖 隔震结构 质量比 频率比 地震动强度指标 

分 类 号：TU352[建筑科学—结构工程] TU311