悬挂结构模拟振动台试验研究  

Shaking table test study on suspended structure

作　　者：蔡文华[1] 郁步军[2] 吴发红[1] 荀勇[1] CAI Wenhua;YU Bujun;WU Fahong;XUN Yong(College of Civil Engineering,Yancheng Institute of Technology,Yancheng 224051,China;Infrastructure Department,Yancheng Institute of Technology,Yancheng 224051,China)

机构地区：[1]盐城工学院土木学院,江苏盐城224051 [2]盐城工学院基建处,江苏盐城224051

出　　处：《地震工程与工程振动》2024年第5期71-81,共11页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51508491)。

摘　　要：为研究设置黏滞阻尼器的悬挂结构在地震作用下的抗震性能,对采用刚性连接杆连接和采用黏滞阻尼器连接的悬挂结构进行了1/20比例缩尺模型振动台试验,主要研究了模型结构的动力特性、阻尼比、结构响应及其减振效果。研究结果表明:与普通悬挂模型结构相比,悬挂减振模型结构自振频率有所降低,结构的阻尼比得到提高,特别是第一阶频率和对应阻尼比;悬挂减振模型结构的主体结构顶部和第五层悬挂楼层的加速度峰值响应均小于普通悬挂模型结构,其中悬挂楼层的加速度峰值响应最佳减振幅度可达94.34%。悬挂减振结构主体结构顶部位移峰值响应较普通悬挂结构有明显地降低,且不同的地震波输入有着不同的减振效果,其中Taft波的减振效果最好,El Centro波次之,最后是人工波;主体结构与悬挂楼面的最大相对位移却大于普通悬挂结构,说明主次结构之间的连接越强,其相对位移就越小。同时也说明悬挂减振结构正是利用悬挂楼层的摆动和黏滞阻尼器来耗散能量,从而有着较好的耗能减振效果。In order to investigate the seismic performance of the suspended structure with viscous damper during earthquakes,the shaking table tests were carried out on two 1/20 scaled models of suspended structures,which were equipped with rigid rods and viscous dampers respectively.The dynamic characteristics,damping ratio,structural response and damping effect of model structures were researched.The test results show that compared with the common suspended model structure,the natural frequency of the suspension damping model structure is reduced,while the damping ratio is improved,especially the first frequency and the corresponding damping ratio.The peak accelerations of the top of the main structure and the fifth suspended-floor of the suspension damping model structure are less than those of the common suspended model structure,but the damping amplitude of the peak acceleration of the fifth suspended-floor is even up to 94.34%.The maximum displacement of the top of the main structure is also distinctly smaller than that of the common suspended model structure.Different seismic wave input has different damping effect,in which the effect of Taft wave is the best,the El Centro wave is the second,and the last is artificial wave.However,the maximum relative displacement between the main structure and the suspended-floor is greater than that of the common suspended model structure,which shows that the stronger the connection between the main and secondary structures,the smaller the relative displacement.It also indicates that the suspension damping model structure takes advantage of the swing of the suspended-floors and the viscous dampers to consume energy,so that the suspended structure with viscous dampers has better effect of energy dissipation and vibration reduction.

关 键 词：悬挂减振结构 黏滞阻尼器 振动台试验 减振效果 减振幅度 

分 类 号：TU351[建筑科学—结构工程] TU317.1