近场地震下立式隔震储罐试验研究及理论分析

Experimental Investigation and Theoretical Analysis of Isolation Storage Tanks Subjected to Near Field Earthquake

针对近场地震激励下隔震储罐响应的问题,采用简化后的三质点力学模型,分别对铅芯橡胶支座隔震储罐模型在近、远场地震作用下的响应进行了对比分析,并将理论分析结果和振动台试验结果进行了对比。对比结果显示,理论分析得出的加速度响应与振动台试验结果相近,但理论分析结果会略微偏小。进一步的理论分析结果表明:近场地震下基础隔震能有效降低储罐的基底剪力和基底弯矩,而晃动波高有所增大;隔震后储罐加速度峰值位于液固耦合质点附近。

Aiming at the problem of the dynamic responses of LRB isolated storage tank under near field seismic excitation, the simplified three particle mechanical model was adopted to analyze and compare the near and far field seismic responses of LRB isolation model tank. the results of theoretical analysis and shaking table test were compared. The comparison results show that the acceleration response of the theoretical analysis is similar to those of the shaking table test, but the results of theoretical analysis are slightly smaller. Further theoretical analyses show that the base shear force and base bending moment can be effectively reduced by base isolation under near field earthquakes, while the height of sloshing wave increases. The peak acceleration of isolation storage tank locates near the liquid-solid coupling joint.