半地下式LNG储罐地震响应的离心试验研究

Centrifugal model tests study on seismic response of semi-underground LNG storage tank

以半地下式LNG储罐的地震响应和桩基础对半地下式LNG储罐的抗震性能影响为研究目的,设计并开展动力离心模型试验,通过对比有桩和无桩储罐的地震响应加速度、摆角、储液晃动波高等差异,验证桩基础对半地下式LNG储罐抗震性能的提升效果。结果表明:以自振周期为控制参数的大型LNG储罐离心试验设计方法满足设计原则和要求;0.05g、0.1g、0.3g El Centro波荷载下,桩基础减小了储罐罐顶5.0%~36.6%的水平加速度、13.8%~33.6%最大摆角和8.4%~18.8%储液晃动波高等地震响应,桩基础有利于提高半地下式LNG储罐的抗震性能。

In order to study the seismic response laws of a semi-underground LNG storage tank and the influences of pile foundation on its seismic performance,a dynamic centrifugal model test is designed and carried out.By comparing the acceleration,swing angle and liquid slosh wave height of pile and non-pile tanks under earthquake,the improvement effects of pile foundation on the seismic performance of the semi-underground LNG storage tank are discussed.The results show that the experimental design method for the large LNG storage tank centrifuge with natural vibration period as the control parameter meets the design principles and requirements.Under the loadings of El Centro waves of 0.05g,0.1g and 0.3g,the pile foundation reduces the horizontal acceleration of 5.0%~36.6%,the maximum swing angle of 13.8%~33.6%and the slosh wave height of 8.4%~18.8%.The pile foundation is beneficial to improve the seismic performance of semi-underground LNG storage tank.