板式橡胶支座力学模型参数的时变特性研究

为明确板式橡胶支座力学模型参数的时变特性.以收集到的服役时间分别为3年、7年、10年、25年的公路桥梁板式橡胶支座为研究对象,开展压剪试验,分析支座使用时间对刚度、摩擦因数等力学模型参数的影响规律.试验结果表明:随着使用时间的增加,板式橡胶支座剪切刚度出现不同程度的退化,剪切刚度与使用时间呈非线性关系;临界滑移位移与使...

Time-varying properties of the mechanical model parameters of plate rubber bearings

In order to clarify the time-varying characteristics of the mechanical model parameters of plate rubber bearings,a series of compression shear tests were carried out on used highway bridge rubber bearings with the service time of 3,7,10 and 25 years.The influence of the bearing service time on mechanical model parameters such as shear stiffness and friction coefficient was analyzed.The test results show that the shearing stiffness degrades to different degrees with the increase of use time.The shearing stiffness has a nonlinear relationship with the use time.At the same time,there is no obvious relationship between the critical slip displacement and the use time.Moreover,the friction coefficient increases with the increasing of service time,and there is a nonlinear relationship between them.Based on the above results,a mechanical analysis model of plate rubber bearings considering the time-varying characteristics of mechanical parameters was proposed.