Ⅲ类季节性冻土场地对圆柱形储液罐地震反应的影响

Influence of the Third Kind Seasonally Frozen Ground on Seismic Response of Cylindrical Tanks

季节性冻土场地从未冻结状态过渡到冻结状态或反向循环,土体的物理力学性质将发生巨大变化,各种强度指标大幅度提高或衰减。中国东北、华北及西北大部分地区烈度在7度以上。立式圆柱形储液罐一旦在地震中遭受破坏,其损失不仅为罐体本身和所储存的介质,更为严重的是它所产生的次生灾害。以Ⅲ类季节性冻土场地上的八种立式储罐为研究对象,计算了场地在非冻结期和冻结期两种情况下储罐的地震反应,并对计算结果进行了对比分析。结果表明Ⅲ类季节性冻土场地上的储罐,冻结期的地震反应要比非冻结期的地震反应明显增大。

The soil of the frozen ground transit from un-frost state to frost state or on the reverse cycle, property of the soil will occur a great transformation and the strength target will increase or decrease dramatically. The thickness of the frost-thaw layer in the northeast,north-china and the most area in the northwest, the intensity exceed 7 degree. The standing cylindrical tanks are the main facility to contain liquid now. Once the tanks are destroyed in the earthquake, the lost are not only the tanks and the liquid, but also the hypo-make disaster. In this paper, we study eight kinds of liquid-storage steel tanks on the third kind of soil site, compute the seismic responses of the tanks on the sites with or without the frozen layer and compare the computing results. The results indicate that the seismic response of tanks on the site with frozen layer is much larger than that of tanks on the site without frozen layer.