碟形弹簧竖向隔震装置的恢复力模型及其试验验证

为研究碟形弹簧竖向隔震装置(DSI装置)的恢复力模型,对DSI装置的受力机理及变形特征进行深入分析;在此基础上,建立DSI装置的原点指向恢复力模型(OO恢复力模型).此外,对典型DSI装置进行往复荷载作用下的力学性能试验,分析其荷载-位移滞回曲线特征,并利用试验结果对OO恢复力模型的有效性进行验证.研究表明:OO恢复力模型具有典型的非对称性特征,摩擦力对其恢复力特性影响较大;往复荷载试验工况下,DSI装置的荷载-位移滞回曲线具有典型的非对称性特征,加载频率对其力学特性影响较小,动荷载幅值和加载预压位移的大小对其力学特性影响较大.随着动荷载幅值的增加,DSI装置的荷载-位移滞回曲线饱满度逐渐减小,因加、卸载刚度不同呈明显不对称性形状;随着加载预压位移的增大,DSI装置的荷载-位移滞回曲线趋于饱满,其耗能能力逐渐增强.OO恢复力模型能够有效模拟DSI装置的力学行为,利用OO恢复力模型计算的DSI装置的等效刚度及等效阻尼与试验结果的误差在8%之内.

Hysteretic model of disc spring isolation bearings and its experimental verification

To study the hysteretic model of disc spring isolation (DSI) bearings, the mechanical property and deformation performance of DSI bearings were investigated,and the Origin-oriented (OO) hysteretic model of DSI bearings was proposed. The mechanical performance of a typical DSI bearing under reversed loadings was studied, and the OO hysteretic curves of the DSI bearing were investigated, whose results were used to verify the OO hysteretic model of the DSI bearings. The results indicate that the OO hysteretic model of the DSI bearings had the characteristic of asymmetry, and the friction forces had significant influence on the OO hysteretic force characteristic. The tested load-displacement hysteretic curves of the DSI bearing had the characteristic of asymmetry under reversed loadings.The loading frequency had little influence on the mechanical property of the DSI bearings, while the loading amplitude and vertical load had great influence on that of the DSI bearings. As the dynamic load amplitude increased, fullness of the load-displacement hysteresis curves of Model E gradually decreased, and the asymmetry of the curves gradually increased.As the preloading displacement increased, the load-displacement hysteresis curves of Model E tended to be full, indicating that its energy dissipation capacity gradually increased.Moreover, the OO hysteretic model can simulate the mechanical performance of the DSI bearings effectively, and the errors between the simulated results and the experimental results were within 8%.