昆明市某特殊设防类建筑隔震结构一体化设计与性能分析

Integrated design and performance analysis of seismic isolation structures for a special fortification building in Kunming

摘要:

结合云南省昆明市某特殊设防类建筑设计项目,介绍一种基于《建筑隔震设计标准》的特殊设防类建筑一体化隔震设计方法。采用YJK软件进行结构设计,选取7条符合规范要求的地震动时程,借助ETABS分析平台对结构分别进行设防、罕遇与极罕遇地震作用下的动力弹塑性时程分析,讨论特殊设防类隔震结构在极罕遇地震作用下隔震橡胶支座的拉、压极限应力控制指标。分析发现:隔震技术有效降低了结构的水平向地震响应;在设防地震作用下结构的最大层间位移角、最大楼面水平加速度均满足规范要求;在罕遇地震作用下结构的最大层间位移角、最大楼面水平加速度,以及隔震橡胶支座的拉、压应力与水平位移均满足规范要求;在极罕遇地震作用下结构最大层间位移角和隔震橡胶支座水平位移均满足规范要求,隔震橡胶支座的拉、压力限值分别以1MPa、20 MPa控制,结果偏于安全。动力弹塑性时程分析结果表明所提隔震结构达到了“设防地震不坏、罕遇地震可修、极罕遇地震不倒”的抗震设防目标。

Abstract:

This study presents an integrated seismic isolation design methodology tailored for special fortification buildings in compliance with the Standard for Seismic Isolation Design of Buildings.The approach was applied to a design project for a special fortification building situated in Kunming City. The structural design process was executed using the YJK software. Subsequently, seven seismic-motion time histories that meet the specified criteria were selected, and a dynamic elastic-plastic time-history analysis of the structure was conducted under seismic fortification, rare, and extremely rare earthquake scenarios using the ETABS analysis platform. The inter-story displacement angle and the floor horizontal acceleration under seismic fortification align with regulatory standards. During rare seismic events, the structure's inter-story displacement angle, floor horizontal acceleration, tensile and compressive stresses, and horizontal displacement of the isolated rubber bearings also conform to specifications. In the event of extremely rare earthquakes, the inter-story displacement angle and horizontal displacement of the isolated rubber bearings meet the prescribed requirements.The tensile and compressive stress limits of the isolated rubber bearings are maintained at 1 MPa and 20 MPa, respectively, indicative of a safety-focused approach. Results from the dynamic elastic-plastic time-history analysis confirmed that the isolation structure has effectively met the seismic fortification objectives by remaining intact during earthquakes, being repairable in rare seismic events, and averting collapse in extremely rare seismic circumstances.