液体粘滞阻尼器及套索位移放大装置在小位移下的性能试验研究

Experimental study on mechanical property of vicious damper and toggle-brace-damper system under small displacement

目前液体粘滞阻尼器用于大震下结构的耗能减振,已取得较好的成果并得到广泛的认可。但对于结构的小震反应或风振反应,由于振幅及结构层间变形较小,液体粘滞阻尼器及其连接件是否能在小幅振动变形的情况下保持紧凑的连接,从而正常的工作,常被怀疑。为此进行了常规建筑用型号的液体粘滞阻尼器在微小位移(小于1mm)下的性能试验,以及,对于连接件精度要求和工作紧凑性要求均较高的套索位移放大装置在小位移下的简谐加载试验,由于非线性阻尼器的特殊性,本试验采用1:1原型试验。得出结论,常规型号的泰勒液体粘滞阻尼器在小幅值的简谐加载试验下,耗能情况良好,其力学性能与设计参数及设计理论本构曲线吻合较好;套索阻尼器系统在小幅值的简谐加载工况下,耗能情况良好,位移放大作用与设计要求基本一致。此外,还介绍了套索阻尼器在工程应用中的经验和需要注意的问题。

It is now accepted widely and proved to be effective that using viscous damper to control the seismic response of structures under rare earthquake.But for the frequency earthquake and the wind-induced vibration response of structures,whether the viscous damper can work effectively is questioned,because at these situations,the story drift induced by the vibration is very small,it can't be sure that the connections between dampers and structures are compact enough to make the dampers work as anticipated.So,the following experiments are conducted,one is the mechanical performance test of a 75MT viscous damper under the small amplitude(less than 1mm)cyclic loading,the other is the test of toggle-brace-damper system under the similar loading.Only when the fabrication and installation precision is enough,the toggle-brace-damper system work normally.Giving the particularity of the nonlinear damper,the full-scale tests are chose.It is concluded that:the energy dissipation capacity of Taylor dampers is still better and the damper's mechanical property is still consistent with the design parameters even under very small displacement;the energy dissipation capacity of the toggle-brace-damper system is also better,and its displacement magnification coefficient is almost identical to the design value.The application and design experience of the toggle-brace-damper system is introduced at last.