高G值铅芯隔震橡胶支座水平性能的反复加载次数相关性试验研究

Experimental Research on the Repeated Loading Dependency of Horizontal Mechanical Property of Lead Rubber Bearings

铅芯隔震橡胶支座被广泛应用于建筑隔震、桥梁隔震及特别重要结构隔震中,以保护其在地震时免遭破坏。在地震多发地带,上述隔震结构会经常遭遇地震作用。支座反复加载试验是用来模拟支座较长时间地震作用时其力学性能随加载圈数增加而变化的情况。采用三种较高G值的铅芯隔震橡胶支座,试验研究了不同加载频率、温度、竖向压力、水平应变对其反复加载规律的影响。探讨了支座在反复加载前后不同时间其基本抗震力学性能的变化情况。给出了高G值铅芯支座在标准温度下力学参数的反复加载变化情况的拟合公式。

Lead-rubber bearings were widely used in bridges,buildings and critical structures to protect them from damage in the earthquake.In an earthquake-prone area,the isolation structure may often encounter the earthquake.Load bearing repeatedly test was used to simulate for the bearings to undergo a long time earthquake,and to investigate the change of their mechanical properties.In this paper,the lead-rubber bearings with three diffreent G values were used,experimental study on different loading frequencies,temperatures,vertical pressures and horizontal strain effect on the repeated loading dependency.The changes of the basic seismic mechanical properties of bearings in different time before and after repeated loading were discussed.The fitting formulas of repeated loading dependency about mechanical parameters of the lead-bearings with high G value under normal temperature were given.