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某超限高层建筑采用钢筋混凝土框架-剪力墙结构,存在高位转换层,其楼板平面开洞尺寸过大,造成楼板平面刚度不连续。弹性分析时,楼层竖向构件最大水平位移与楼层水平位移平均值之比为1.31,属结构扭转不规则,为此结构设计采用了软钢阻尼器来提供附加刚度及阻尼。为研究该高层建筑结构抗震性能,进行了1∶20缩尺模型的振动台试验,获得了模型结构的动力特性及在地震作用下的动力反应,分析了原型结构的地震反应。试验及分析结果表明,该结构满足现行建筑抗震设计规范的抗震设防要求;阻尼器减小了结构的扭转反应,对加速度反应起到了一定的减小作用;转换层上刚度变化较大,应逐步减缓刚度变化,改善相邻楼层的延性;出屋面层的鞭梢效应严重,应重视出屋面层的抗震设计。
An overrun high-rise building with reinforced concrete frame-shear wall structure, there is high conversion layer, the floor plank hole size is too large, resulting in floor stiffness discontinuity. In the elastic analysis, the ratio of the maximum horizontal displacement of the vertical component of the floor to the average value of the horizontal displacement of the floor is 1.31, which belongs to the structure which is irregularly twisted. Therefore, the mild steel damper is adopted for the structural design to provide additional rigidity and damping. In order to study the seismic behavior of the tall building, a shaking table test of 1:20 scale model was carried out. The dynamic characteristics of the model structure and the dynamic response of the model under earthquake were obtained. The seismic response of the prototype structure was analyzed. The results of the test and analysis show that the structure meets the seismic fortification requirements of the current codes for seismic design of buildings. The damper reduces the torsional response of the structure and plays a role of reducing the acceleration response. The stiffness of the transfer layer varies greatly and should be gradually Slow down the change of stiffness and improve the ductility of adjacent floors. The effect of whiplash on the roof is serious, and the seismic design of the roof should be emphasized.