建筑结构学报2025，Vol.46Issue(3)：12-23,12.DOI:10.14006/j.jzjgxb.2024.0315
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
摘要
Abstract
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 0.3,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Key words
large-span roof/isolated structures/mass ratio/frequency ratio/ground motion intensity measures分类
土木建筑引用本文复制引用
邱意坤,李纪影,牛奔,张龑华,李伟,王轶,甄伟,盛平..大跨度屋盖隔震结构动力响应与减震效果研究[J].建筑结构学报,2025,46(3):12-23,12.基金项目
北京市科技计划课题(Z221100005222009). （Z221100005222009）
