【摘要】 分析了一栋已建悬挂建筑在不同地震动输入下的结构响应规律.首先,根据其特点,建立了相应的数值分析模型.其次,在3组远断层地震波和3组近断层地震波输入下,分析了地震动特性对悬挂结构减振效果的影响;最后,给出了阻尼器分布对减振效果的影响.分析结果表明:在远断层和近断层地震波作用下,存在最优的阻尼系数使得筒体的动力响应最小.虽然地震波频谱特性不同,但优化得到的最优阻尼系数差别不大.在近断层地震波作用下,主结构的动力响应较大,且减振效果相对较差.阻尼器连接悬挂楼面和主结构筒体时,能够较好地约束悬挂楼面的层间位移和相对于筒体的位移.近断层地震波作用下悬挂楼面的层间位移和相对于筒体位移比远断层地震波作用下大得多.当阻尼器的总量一定时,按三角形或悬挂楼面的基本振型布置阻尼器比均匀分布能取得更好的减振效果,且能够更好地抑制悬挂楼面的位移.更多还原

【Abstract】 The influence of the earthquake motions on the responses of the suspended-floor building are evaluated.First,based on the structural features,its numerical model was built.Secondly,time history analyses were employed to evaluate the effect of characteristics of earthquake motions on the controlling results of the suspended-floor structures under near-fault and far-fault earthquakes.Finally,the influence of the locations of the dampers was addressed.Numerical results show that the optimum damping coefficient of dampers can be obtained to minimize dynamic responses of the core-tube under near-fault and far-fault earthquakes and the optimum values are nearly identical in spite of the different features of earthquake motions.Moreover,under near-fault earthquakes,dynamic responses of the core-tube are relatively large but the vibration-controlling effect is small.The relative displacement of suspended floors to the core-tube and the story drift of suspended floors can be well constrained when the dampers are used to link the suspended floor with the core-tube.However,the relative displacements of suspended floors under near-fault earthquakes are larger than those under far-fault earthquakes.If the total quantity of dampers is given,the triangle or basic-mode distribution patterns of dampers are better than the uniform distribution pattern,the former would be beneficial to better controlling effect and decrease relative displacements of suspended floors.更多还原