近断层水平地震激励下巨-子三维隔震结构振动台模型试验
发布时间：2019-01-26 19:44
【摘要】：将三维隔震层从地面标高上移至巨-子结构(巨型框架-子框架结构体系)的各子结构底部,可以解决高层三维隔震结构摇摆反应明显的问题,且整体隔震结构不再受高宽比限值的制约。设计加工了一个3层巨型框架结构模型,底层大空间,上部含有2个次框架。在2个次框架底部与主框架楼板相连部位安装4个三维隔震支座;进行了近断层及远场罕遇水平地震激励下,巨-子抗震结构和巨-子三维隔震结构的地震模拟振动台对比试验和数值分析。结果表明:巨-子三维隔震结构将隔震层上移至次框架底部并未延长结构的基本周期。次框架和主框架的动力响应减震效果显著,近、远场及场地类型对隔震率没有明显影响。由于近断层地震动的脉冲效应及其长周期成分与结构周期更接近,近断层激励下次框架和主框架的动力响应比相同场地的远场地震动大10%~20%,Ⅲ类场地近断层地震激励下的结构响应比Ⅱ类场地大10%~25%。
[Abstract]:Moving the three dimensional isolation layer from the ground elevation to the bottom of each substructure of the mega-substructure (giant frame-sub-frame structure system) can solve the problem of the obvious rocking response of the high-rise three-dimensional isolated structure. And the whole isolated structure is no longer restricted by the limit value of aspect ratio. A three-story mega-frame structure model is designed and fabricated, with a large space at the bottom and two sub-frames in the upper part. Four three dimensional isolation supports are installed at the bottom of two subframes connected to the main frame floor. The seismic simulation shaking table tests and numerical analysis of the mega-sub-seismic structure and the mega-sub-3-D isolated structure under the excitation of near-fault and far-field rare horizontal earthquakes are carried out. The results show that moving the isolation layer up to the bottom of the secondary frame does not extend the basic period of the structure. The seismic response of the secondary frame and the main frame is remarkable, but the near, far field and site type have no obvious influence on the isolation rate. Because the pulse effect of near-fault earthquake and its long-period components are closer to the structural period, the dynamic response of the next frame and the main frame excited by the near fault is 10% and 20% larger than that of the far-field ground motion in the same site. The structural response of type 鈪，
本文编号：2415842
[Abstract]:Moving the three dimensional isolation layer from the ground elevation to the bottom of each substructure of the mega-substructure (giant frame-sub-frame structure system) can solve the problem of the obvious rocking response of the high-rise three-dimensional isolated structure. And the whole isolated structure is no longer restricted by the limit value of aspect ratio. A three-story mega-frame structure model is designed and fabricated, with a large space at the bottom and two sub-frames in the upper part. Four three dimensional isolation supports are installed at the bottom of two subframes connected to the main frame floor. The seismic simulation shaking table tests and numerical analysis of the mega-sub-seismic structure and the mega-sub-3-D isolated structure under the excitation of near-fault and far-field rare horizontal earthquakes are carried out. The results show that moving the isolation layer up to the bottom of the secondary frame does not extend the basic period of the structure. The seismic response of the secondary frame and the main frame is remarkable, but the near, far field and site type have no obvious influence on the isolation rate. Because the pulse effect of near-fault earthquake and its long-period components are closer to the structural period, the dynamic response of the next frame and the main frame excited by the near fault is 10% and 20% larger than that of the far-field ground motion in the same site. The structural response of type 鈪，
本文编号：2415842
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