大高宽比橡胶垫隔震结构振动台试验研究(1)

On large height-width ratio rubber bearings isolation structure

介绍了相似比为5、高宽比为3.1的模型结构振动台试验结果及初步分析.首先介绍了铅芯橡胶垫的隔震设计及橡胶垫静力研究结果,橡胶垫隔震模型结构振动台试验的试验计划,给出了8度多个地震波作用下的试验结果.试验结果的分析表明,模型结构在8度E l-Centro波罕遇地震作用下,位移和加速度反应都很大.橡胶垫在垂直方向的刚度已经进入到非线性阶段,橡胶垫存在承载力失效的危险,且模型竖向颠动和水平晃动现象都很严重,被迫停止试验,说明隔震结构在高烈度地震作用下是存在倾覆危险的.

The shaking table test and analysis on a model structure are done. The resemble ratio of model structure is 5, and its height -width ratio is 3.1. At first, the design process and the static test result of the designed lead - plug rubber bearings are introduced. Secondly, the load plan of the shaking table test on the rubber bearing isolation model structure is put out. Then the test result of intensity of fortification level 8 in many earthquake waves is introduced mostly. The analysis on test result indicates that the acceleration and displacement of model structure are very large in intensity of seldom occurred earthquake of fortification level 8 in El -Centro wave. The vertical stiffness of rubber bearings is nonlinear. The rubber bearings have potential danger of default bearing capacity. And the model bumps in vertical and shakes in horizon. The test has to be stopped. So the result shows that isolation structure has overturning danger in zone of high fortification level.