【摘要】 以安装风振控制TMD的某标志塔为原型,研究了TMD系统地震响应控制效果.根据塔的自振特性考虑无TMD、1TMD、2TMD和3TMD四种TMD安装方案.首先从塔的SAP2000三维模型中抽取X方向的二维串联模型并按此分析和计算了安装不同方案TMD前后标志塔各模态传递函数,研究不同TMD方案对结构各阶模态响应的影响;另外文中选用31条地震加速度记录进行数值模拟,研究不同TMD方案的地震控制效果.计算结果表明,低阶模态TMD对高阶模态的振动没有控制效果,采用一个TMD进行风振控制的结构,在遭遇高频含量丰富的地震加速度时程时,需要增加控制高阶模态的TMD,以提高其对地震响应的控制效果.更多还原

【Abstract】 Taking a steel symbolic tower with wind control TMD as prototype,this paper studied the seismic control effectiveness of TMD systems.Considering that earthquake may stimulate more structural modes than one,four TMD schemes,namely,without TMD,one TMD,two TMD and three TMD,were selected respectively.Firstly,according to SAP2000 3D model,a 2D serial concentrated mass model was established. Then,the modal transfer functions of structure with different TMD schemes were analyzed and calculated to study the influence of different TMD scheme on different mode response indirectly.Secondly,31 earthquake waves were chosen to study the seismic control effectiveness of different TMD schemes directly and comprehensively.Simulation results demonstrate that under earthquake waves with high frequency components,the high frequency modes of structures will be motivated and in this case,TMD for high frequency is needed to improve the overall control effectiveness of TMD system.更多还原