立式储罐与地基相互作用地震反应分析

Seismic response analysis of interaction between stand storage tank and its base

在考虑地基与储罐相互作用的情况下,采用有限元法对储罐在水平地震荷载作用下的反应进行了计算。推导了系统刚度矩阵及质量矩阵的计算过程。通过对四种场地条件下的地震响应分析,得出了储罐各种参数对地震反应的影响。分析表明:不同的地震激励对储罐系统的反应是不同的;地基刚度对系统的动力响应的影响也很大:即地基越“柔”,基底弯矩、罐壁轴向应力越小,但环向应力和底板变形却在增加。

Seismic response of stand storage tank-fluid-foundation interaction is calculated under action of strong earthquake. The effects of parameters on the seismic response of the tank is analyzed under four site conditions. The results show that seismic response of the tank is different in different sites; the effect of base modulus on its seismic response is obvious, the base is softer, the base moment and axial stress are more small, while the hoop stress and base uplift are greater.