近场地震作用下巨-子隔震结构振动台试验  

SHAKING TABLE TEST OF THE ISOLATED MEGA-SUB STRUCTURE UNDER NEAR-FIELD GROUND MOTION

作　　者：颜学渊[1] 祁皑[1] 毛会敏 张超[1] 徐小勇[1] 

机构地区：[1]福州大学土木工程学院,福建福州350116 [2]福建工程学院生态环境与城市建设学院,福建福州350118

出　　处：《工程力学》2017年第11期109-115,144,共8页Engineering Mechanics

基　　金：国家自然科学基金项目(51578160);福建省教育厅科技项目(JA15050);福建省高校杰出青年科研人才计划项目(810104)

摘　　要：基于子框架隔震的巨-子结构可以解决高层隔震结构受限于高宽比限值的问题,现有研究主要集中在理论、数值分析及远场地震作用。该文设计制作了一个具有三个巨型结构层的巨-子结构实验模型,将铅芯隔震支座设置在子框架底部,对巨-子结构进行了近、远场地震作用下无控和有控的振动台对比试验。试验结果表明:在子框架与主框架的连接部位设置隔震层,对主框架的地震反应具有明显的调谐减震作用,对子框架的地震反应也具有显著的隔震作用;近场地震作用下主框架和子框架的地震反应都要大于相同场地的远场地震动。超设防烈度近场地震作用下,隔震子框架与主框架发生碰撞,对结构的舒适性和安全性产生不利影响。Mega-sub structures based on the sub-structure isolation can solve the problem of height-width ratio limitation of the base isolated high-rise structures. The existing studies mostly focus on the theoretical and numerical analysis of the mega-sub structure under far-field ground motions. An experimental model of mega-sub structure was designed and manufactured, which had three mega floors. Lead rubber bearings were installed at the bottom of the sub-structure, then comparison shaking table tests of the uncontrolled and controlled mega-sub structure under near-field and far-field ground motions were performed. The results showed that setting isolation layer at the connection between the sub-structure and the main-structure had obvious damping effect of Tuned Mass Damper （TMD） on the main-structure＇s seismic responses and significant isolation effect on the sub-structure＇s seismic reactions. The seismic responses of the main-structure and the sub-structure under near-field ground motions are bigger than that under far-field ground motions. Under strong near-field ground motion, there is pounding between isolated sub-structures and main-structure, which has disadvantages towards structure＇s degree of comfort and safety.

关 键 词：近场地震 巨-子结构(巨型框架-子框架结构体系) 隔震 振动台试验 碰撞 

分 类 号：TU352.1[建筑科学—结构工程]