桥梁高阻尼隔震橡胶支座性能试验研究

Behavior of high damping seismic isolation rubber bearings for bridges

高阻尼隔震橡胶支座是一种具有耗能性能的新型隔震支座,已经开始应用于桥梁减隔震控制中。为了研究这种新型隔震支座的滞回性能,选取用于某高速公路桥梁的高阻尼隔震支座进行竖向压缩和水平剪切加载试验研究,研究其竖向压应力、水平极限剪切应变、加载频率及加载次数对滞回性能的影响。研究结果表明:高阻尼隔震橡胶支座的滞回曲线较为饱满,耗能效果较好,且多次循环加载后其耗能能力未出现降低的趋势;加载频率对于支座的等效刚度和等效阻尼有一定的影响。

High damping seismic islolaton rubber bearings（ HDRBS） as a new kind of isolation rubber with the good performance of consuming energy have been used in bridge seismic isolation control recently. In order to study the hysterertic behavior of this new kind of isolation rubber,high damping seismic islolaton rubber bearings used in a highway bridge were taken as objects in vertical compression and horizontal shear loading tests. The effects of vertical stress,horizontal ultimate shear strain,loading frequency and loading times on hysteretic properties were investigated. The results show that the hysteretic curve of HDRBS is rather plump,describing good energy comsuming character and after repeated cyclic loading the performance of consuming energy does not appear decreasing trend. In addition loading frequency has some effect on the equivalent bearing stiffness and equivalent damping ratio.