Study on Seismic Simulation Shaking Table Tests of a Complex Museum with Combined Seismic Isolation and Shock Absorpation Structure
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摘要: 为研究某博物馆隔减震联合方案,对采用橡胶隔震支座基础和上部屈曲约束支撑的结构进行了1/30缩尺模型的地震模拟振动台试验。试验研究表明:在各水准地震作用后,联合隔减震结构仅出现轻微损伤,在设防地震后Y向第一平动自振频率降低了9.1%,罕遇地震后第一扭转自振频率降低了6.1%;加速度放大系数在隔震层为0.45,上部结构也均小于1.0;随着地震作用的增加隔震支座的耗能表现越来越好,从多遇地震下耗能仅约4 kN·mm,到罕遇地震下耗能最大值约达426 kN·mm。该结构的隔减震方案实现了预期减震目标。Abstract: In order to study the seismic performance of a museum adopting a measure of seismic isolation and shock absorption, a 1/30 scale model of the structure with rubber isolation bearings beneathe column bottoms of ground floors and buckling-restrainted braces in the upper structure was conducted on a shaking table for earthquake simulation tests. Experimental research showed that subjected to various levels of earthquakes, the combined seismic isolation and shock absorption structure was only slightly damaged, the first of translation natural vibration frequency in the Y-direction was reduced by 9.1% subjected to the fortification earthquake, and the first torsional frequency reduced by 6.1% subjected to the rare earthquake. The acceleration amplification factor was 0.45 in the isolation storey, and the upper structure was also less than 1.0. The energy consumption performance of isolation bearings became better and better with the increase of earthquake intensities. From the energy consumption of only about 4 kN·mm under frequent earthquakes to the maximum energy consumption of about 426 kN·mm under rare earthquake, the combined measure for the structure achieved the expected shock absorption goal well.
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Key words:
- combined damping /
- isolation /
- energy dissipation /
- shaking table test /
- feasibility scheme
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