长周期地震动作用下高层隔震结构减震性能试验研究

发布时间：2018-11-23 07:38

【摘要】：近、远场长周期地震动中的长周期和近场脉冲特性的存在,可能导致长周期的高层隔震结构产生隔震层位移放大效应。通过振动台试验分析与验证其对长周期的高层隔震结构减震性能带来的不利影响,首先分析近、远场长周期地震动的反应谱特性;接着设计制作一个具有典型工程意义的大底盘单塔楼缩尺模型,进行有限元分析与振动台试验,探讨长周期地震动对楼层加速度、层间位移和隔震层位移等减震性能的影响;最后针对可能出现的隔震层位移超限问题,提出在隔震层增设黏滞阻尼器组成的复合减隔震体系,分析验证其减震和限位保护效果。结果表明:远场长周期地震动下隔震结构的响应明显大于普通周期地震动;近场脉冲长周期地震动作用下结构减震效果较差,隔震层位移明显大于位移容许值;复合减隔震体系有效地控制了隔震层的最大位移,降低了大底盘的加速度和层间位移响应,同时对上部塔楼也具有较好的减震效果。
[Abstract]:The existence of long period and near field pulse characteristics in the near and far field long period ground motions may lead to the isolation layer displacement amplification effect of long period tall isolated structures. The vibration table test is used to analyze and verify its adverse effect on the vibration absorption performance of long-period high-rise isolated structures. Firstly, the response spectrum characteristics of near-and far-field long-period ground motions are analyzed. Then a large chassis single tower scale model with typical engineering significance is designed and fabricated. Finite element analysis and shaking table test are carried out to study the effect of long-period ground motion on the seismic absorption performance such as floor acceleration, floor displacement and isolation layer displacement. Finally, a composite isolation system composed of viscous dampers is put forward to solve the possible problem of the displacement of the isolation layer, and the effect of the damping and limiting protection is analyzed and verified. The results show that the response of the isolated structure is obviously larger than that of the ordinary periodic ground motion under the long period ground motion in the far field, the damping effect of the structure under the action of the near field pulse long period ground motion is poor, and the displacement of the isolated layer is obviously larger than the allowable displacement value. The composite isolation system can effectively control the maximum displacement of the isolation layer, reduce the acceleration of the large chassis and the response of the displacement between the floors. At the same time, it also has a better seismic absorption effect on the upper tower.
【作者单位】：福州大学土木工程学院;福建工程学院土木工程学院;上海大学土木工程系;
【基金】：国家自然科学基金资助项目(51678158)
【分类号】：TU973.31

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