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针对成都博物馆不规则基础隔震结构,分别建立8度(0.2g)地震作用隔震模型及7度(0.15g)地震作用非隔震模型,在多遇地震作用下,对两种模型结构体系的振型(包括平动分量和扭转分量)、扭转位移、扭转加速度、扭转剪力以及结构构件扭矩进行了对比分析。研究结果表明:基础隔震措施有效地控制了不规则结构的扭转效应;以前二阶振型的扭平分量比(扭转振型分量与平动振型分量之比)小于0.15,扭转位移比(楼层最大弹性水平位移与该楼层两端弹性水平位移平均值之比)小于1.2,扭转剪力比(垂直于地震输入方向的构件扭转剪力与地震输入方向的构件剪力之比)小于0.2为控制指标来控制结构的扭转效应。
According to the irregular base isolation structure of Chengdu Museum, the seismic isolation model of 8 degrees (0.2 g) and the non-isolation model of 7 degrees (0.15 g) earthquake are established respectively. Under the action of many earthquakes, (Including translation component and torsional component), torsional displacement, torsional acceleration, torsional shear force and torque of structural members were compared. The results show that the base isolation measures effectively control the torsional effect of the irregular structure. The torsional component ratio (the ratio of the torsional vibration mode to the translational vibration mode) of the second-order modes is less than 0.15 and the torsional displacement ratio The ratio between the maximum elastic horizontal displacement of the floor and the average horizontal elastic displacement of the floor is less than 1.2, and the torsional shear ratio (the ratio of the member shear force perpendicular to the direction of seismic input to the member shear force in the direction of seismic input) is less than 0.2 Control indicators to control the torsional effect of the structure.