考虑高阶效应的高层基础隔震结构振动与控制  

Vibration and control of high-rise base-isolated structures considering high-order effects

作　　者：郑国琛[1] 曹凌涛 吴应雄[2] 祁皑[2] 许航莉[1] 蒋国平[1] ZHENG Guochen;CAO Lingtao;WU Yingxiong;QI Ai;XU Hangli;JIANG Guoping(College of Engineering,Fujian Jiangxia University,Fuzhou 350108,China;College of Civil Engineering,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]福建江夏学院工程学院,福建福州350108 [2]福州大学土木工程学院,福建福州350108

出　　处：《建筑结构学报》2023年第9期93-103,共11页Journal of Building Structures

基　　金：福建省科技重大专项项目(2019HZ07011);福建省自然科学基金项目(2020J01940);福建省自然科学基金项目(2023J011111);福建省教育厅中青年基金项目(JAT210357)。

摘　　要：为了研究高层基础隔震结构的高阶效应及其控制方法,揭示了高层基础隔震结构的高阶效应机理。以实际工程为原型,进行了1/15比例的缩尺模型地震振动台试验,同时建立有限元模型,通过时程分析方法获得加速度与位移响应,并将分析结果与试验数据进行对比验证了有限元模型的有效性。研究结果表明:在一定条件下,高层基础隔震结构高位部分可能产生较明显的高阶效应,其响应突变层位置基本置于高位部分质量与结构总质量占比约为1/5处;8度罕遇地震作用下,结构顶部加速度放大系数超过2,响应突变层附近层间位移角超过1/100,该类型结构可能具有较大安全隐患;提出的基础隔震与TMD混合减震方案和基础与层间混合隔震方案均能有效的解决高层基础隔震结构的高阶效应,其中基础隔震与TMD混合减震方案振动控制效果能达50%左右;基础与层间混合隔震方案的最佳减震效果可接近50%。In order to study the high-order effect of high-rise foundation isolation structure and its control method,the working mechanism of high-order effect of high-rise foundation isolation structure is revealed.Seismic shaking table test was carried out based on a 1/15 scaled practical project,and a finite element model was established.The acceleration and displacement responses were obtained by time history analysis method.The effectiveness of the finite element model was verified by comparing the analysis results with the test data.The results show that,under certain conditions,the higher part of the high-rise foundation isolation structure may produce obvious high-order effect,and the mutation layer is basically located at the place where the mass ratio of the higher part to the total mass of the structure is about 1/5.Under action of 8 dagree rare earthquakes,the acceleration amplification coefficient at the top of the structure is larger than 2,and the interlayer displacement angle near the mutation layer is larger than 1/100.Both the proposed base-TMD hybrid isolation scheme and the base-floor hybrid isolation scheme can effectively solve the high-order effect of the high-rise foundation isolation structure,among which the vibration control effect of the base-TMD hybrid isolation scheme can reach about 50%.The optimal isolation effect of base-layer mixed isolation scheme is close to 50%.

关 键 词：高层隔震结构 高阶效应 振动台试验 混合减震 质量比 

分 类 号：TU973[建筑科学—结构工程]