高烈度地区高层基础隔震结构模型振动台试验研究  

Shaking table test study of high-rise base-isolated structures in high-intensity area

作　　者：许航莉[1] Xu Hang-li(Fujian Jiangxia University,Fuzhou 350108,China)

机构地区：[1]福建江夏学院,福建福州350108

出　　处：《工程抗震与加固改造》2024年第5期62-70,共9页Earthquake Resistant Engineering and Retrofitting

基　　金：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：高层基础隔震结构在我国高烈度地区城市应用前景广阔,开展此类型结构地震反应研究十分必要。以一幢典型办公楼为原型,开展1/15缩尺地震模拟振动台试验,通过不同地震波输入,获得模型结构的动力特性、绝对加速度响应、层间位移响应及隔震层响应等参数,并对结构高层部分特殊的突变放大现象进行分析。结果表明:高层基础隔震结构总体具有良好的耗能能力及减震性能;结构可能存在由于高层部分自振频率与整体结构某高阶频率相同而产生的高阶效应,同时高阶效应可能由于结构高层部分自振频率与场地卓越频率相近而愈发强烈;高阶效应使得隔震层上部结构突变处在罕遇地震作用下超越弹塑性层间位移角,同时加剧提离摇摆效应,带动隔震支座受拉超限,需采取振动控制措施以抑制高阶效应。The application prospect of high-rise base-isolated structures in high-intensity cities of China is broad,and it is necessary and pressing to study on the seismic response of this high-rise base-isolated structures.Taking a real office building as a prototype,shaking table tests for its one-fifteen scale model were conducted.Its dynamic characteristics and dynamic responses under different earthquakes were measured.By inputting different seismic waves,the dynamic characteristics,acceleration response,displacement response and isolated layer response of the model were obtained,and the special sudden amplification phenomenon at the upper part of the structure was analyzed.The results indicate that the high-rise base-isolated structure has good overall energy dissipation and seismic performance.The structure may have high-order effects due to the fact that the natural frequency of some high-rise structure is the same as a certain high-order frequency of the whole structure,and the high-order effects may become increasingly strong due to the similarity between the natural frequency of this high-rise structure and the dominant frequency of the site.The high-order effect causes the upper structure of the isolation layer to suddenly change beyond the elastic-plastic interlayer displacement angle under rare earthquake actions,while exacerbating the uplift and sway effects,causing the isolation support to exceed the tensile limit.Therefore,vibration control measures must be taken to suppress the higher order effect.

关 键 词：高层基础隔震 振动台试验 高阶效应 地震响应 

分 类 号：TU973[建筑科学—结构工程] TU352.1