带有填充墙的LNG储罐抗震性能数值模拟分析

Seismic performance numerical simulation analysis of LNG storage tank with filled wall

为了研究桩土、填充墙与内外罐相互作用对16×104m3全容式LNG储罐地震响应的影响,桩土与填充墙采用弹簧阻尼单元,预应力混凝土外罐体采用三维实体单元,钢制内罐采用壳单元,流体采用势流体单元,基于ADINA建立三维空间有限元模型,在峰值地震加速度为0.34gEl Centro地震动激励下,应用Newmark数值积分方法进行地震响应分析,并与理论解进行对比。结果表明:内外罐之间的填充墙对于地震响应具有一定的耗能减震效果,但对晃动波高影响较小;有限元解与理论解的基底剪力、基底弯矩比较接近,晃动波高理论解小于有限元解。从反映实际情况出发,有限元解是可行的。LNG储罐抗震设计时,不考虑填充墙的作用是偏于安全的。

To study pile-soil,filled wall and inner tank and outer tank interaction effect on seismic responsees of16 × 104m3full-containment LNG tanks,pile-soil and filled wall use spring damper element,prestressed concrete outer tank uses 3D solid element,inner tank uses shell element,and fluid uses potential flow element,based on ADINA,three-dimensional finite element model is established.Peak acceleration 0.34g El Centro ground motion is adopted to analyze seismic response by using Newmark numerical integration method,and it is compared with the theory solution.The results show that:filled wall between inner tank and outer tank could reduce seismic response,but has little effect on the sloshing height; finite element solutions are compared with the theoreticat solutions; base shear and base bending moment are coinciclent; sloshing height is less than the theoretical solution.From actual conditions,the finite element solution is feasible.On the safe side,the filled wall may be ignored in seismic design of LNG storage tank.