FRP橡胶隔振器水平剪切特性的初步研究

应用小波变换及自助理论对多自由度系统进行模态参数辨识。通过对结构系统响应信号进行小波变换将其表示在时频域内，在分析了小波变换的时频分辨率特性后，利用最小Shannon熵获取最优小波参数，并运用自助理论估计出模态参数分布的置信区间范围。数值仿真表明了该方法对模态参数估计的有效性。将所提方法应用于一个振动台的模态分析，实验结果表明，提出的小波自助模态参数辨识方法降低了模态参数辨识的难度，提高了模态频率和阻尼比的辨识精度。

Pilot study on the horizontal shear behaviour of FRP rubber isolators

FRP rubber isolators are composed of rubber layers bonded to interleaving reinforcing plates. Former experimental studies have shown that the equivalent damping, shear deformation capacity and vertical loading capacity of FRP rubber isolators are superior to those of other isolators, so broad application prospects of FRP rubber isolators should be expected. Because former theoretical investigations of the isolator focus on the vertical compression and bending performances and investigations of horizontal shear characteristic and its mechanism are insufficient, practice application of the isolator is limited therefore. In this paper, a theoretical research on the horizontal shear behavior of rectangular FRP rubber isolators is conducted and the relation between total horizontal shear force and the shear strain of rectangular FRP rubber isolators is presented. The nonlinear characteristic of the horizontal shear force and its formation cause are investigated then, and it’s found that the horizontal shear stiffness would descend with the increase of shear strain. At last, it is shown with a numerical example that vibration isolation efficiency of FRP rubber isolator is enhanced along with the increase of shear strain.