地下管廊管线支吊架隔震支座设计与试验研究

Design and Experimental Study of Isolation Bearing for Underground Pipe Gallery Support Hanger

为了提高地下管廊管线抵抗地震灾害作用的能力,本文基于隔震支座设计理论与有限元分析,优化设计了2种小型橡胶支座。采用不同的工艺对橡胶支座进行试制,测试其主要性能指标,并将隔震支座安装在承重支吊架上,进行了减隔震性能试验。结果表明:优化的支座实现了减小水平刚度和确保竖向刚度的最大平衡;采用橡胶硫化压注的支座性能明显好于橡胶分层粘结的方法;铅芯隔震橡胶支座具有更好的耗能能力,插入铅芯越多,耗能能力越好,但水平刚度也随之增大;冲击振动荷载作用下,相比于无隔震支座情况,安装隔震橡胶支座的吊架上方管线加速度减小93.9%,减隔震效果显著。设计的减隔震支座体积小、参数可调、生产工艺简单、减隔震效果好,具有较好的工程应用前景。

In order to improve the anti-seismic ability of underground pipeline corridor pipeline,two kinds of small rubber bearings are designed and optimized based on the design theory of isolation bearings and finite element analysis.These rubber bearings were trial-manufactured using different processes and the main performance indicators were tested.The isolation bearings were installed on the support hangers and the seismic isolation performances were tested.The results show that:The optimized bearings have reached the best balance of minimized the horizontal stiffness and ensure the vertical stiffness.The bearings manufactured using rubber vulcanized pressure injection have better performances than that of rubber layered bonding method.The rubber bearings with lead isolation show better energy dissipation capacity,and more inserted lead results better energy dissipation capacity.However,the horizontal stiffness also increases.Compared with no isolation bearing,the isolation rubber bearings can reduce the acceleration of the supported pipeline up to 93.9%under the impact load,the isolation effect is remarkable.The proposed seismic isolation bearing has advantages of small volume,adjustable parameters,simple manufacturing technique,and good seismic isolation performances,It has good application in engineering.