长周期地震动下大跨空间结构空气弹簧-摩擦摆三维隔震体系振动控制分析  

VIBRATION CONTROL ANALYSIS OF THE AIR SPRING-FPS THREEDIMENSIONAL ISOLATED STRUCTURE OF LARGE-SPAN SPATIAL STRUCTURE SUBJECTED TO LONG-PERIOD GROUND MOTIONS

作　　者：景铭 韩庆华[1,2,3] 芦燕 齐朋[1,4] JING Ming;HAN Qing-hua;LU Yan;QI Peng(School of Civil Engineering,Tianjin University,Tianjin 300350,China;Key Laboratory of Earthquake Engineering Simulation and Seismic Resilience of China Earthquake Administration(Tianjin University),Tianjin 300350,China;Key Laboratory of Coast Civil Structure Safety of China Ministry of Education(Tianjin University),Tianjin 300350,China;China Construction Eighth Engineering Bureau First Construction Co.,Ltd,Jinan,Shandong 250000,China)

机构地区：[1]天津大学建筑工程学院,天津300350 [2]中国地震局地震工程综合模拟与城乡抗震韧性重点实验室(天津大学),天津300350 [3]滨海土木工程结构与安全教育部重点实验室(天津大学),天津300350 [4]中建八局第一建设有限公司,山东济南250000

出　　处：《工程力学》2023年第11期31-45,共15页Engineering Mechanics

基　　金：国家自然科学基金项目(U1939208,52022067)。

摘　　要：该文将新型空气弹簧-摩擦摆三维隔震支座应用于大跨单层球面网壳中,探讨了长周期地震动对三维隔震体系振动控制效果的影响规律。该三维隔震支座可有效降低结构在地震动作用下的响应,当地震动峰值加速度(PGA)相同时,普通地震动下的隔震效果最优,近断层脉冲型地震动下隔震效果次之,远场长周期地震动下隔震效果最差。该现象与长周期地震动与和长周期隔震结构之间的类共振效应有关。随着支座刚度的减小,普通地震动和近断层脉冲地震动作用下的隔震效果提高,远场长周期地震动作用下的隔震效果降低。远场长周期地震动低频分量丰富,其反应谱具有典型的双峰特性,导致结构响应在长周期段随结构周期的延长而增大。进行三维隔震设计时,建议传递比TR取值大于0.2,既保证隔震效果,又能控制三维隔震支座竖向位移响应在设计极限位移内。The seismic behavior of a large-span single-layer spherical reticulated shell with the novel air spring-FPS three-dimensional(3D)isolation bearing is investigated.The influence of long-period ground motions on the vibration control effect of the 3D isolated structure is discussed.The dynamic time-history analysis indicated that 3D isolation bearings can effectively reduce the structural seismic response under various ground motions.With the same peak ground acceleration(PGA),the isolation effect of ordinary ground motions is better than near-fault pulse-like ground motions and much better than far-field long-period ground motions.This phenomenon is related to the quasi-resonance effect between the long-period ground motions and the long-period isolated structures.With the decrease of the bearing stiffness,the isolation effect is improved for ordinary ground motion and near-fault pulse-like ground motion while it is reduced for far-field long-period ground motions.The abundant low-frequency characteristics of far-field long-period ground motion make its response spectra have bimodal characteristics,resulting in the increase of the structural response with the period prolongation.TR is suggested to be larger than 0.2 in order to not only obtain a good isolation effect but also limit the vertical bearing displacement with an allowable value for a three-dimensional isolated structure.

关 键 词：三维隔震支座 长周期地震动 单层球面网壳 振动控制效果 节点加速度 杆件等效应力 

分 类 号：TU352.1[建筑科学—结构工程]