大型立式储罐竖向基础隔震研究

Vertical base isolation of large-scale vertical storage tanks

摘要:

为了降低立式钢制储罐竖向地震响应,从罐液耦联运动出发,依据储罐内液体满足的边界条件和势流体理论,选择合理的速度势,给出动水压力的理论表达;考虑动水压力和土与结构相互作用的影响,建立罐液耦联振动方程、隔震层控制方程和基础的竖向振动方程;给出储罐侧壁剪力、侧壁弯矩和应力的理论表达．选取150 000 m³储罐,采用Wilson-θ法对其进行地震动响应分析,结果表明:储罐竖向基础隔震体系能够降低储罐的径向应力、轴向应力和环向应力地震响应,设计时需要综合考虑各种因素选择最佳场地、隔震周期、阻尼比和高径比．

Abstract:

To reduce the vertical seismic response of vertical storage tanks with fluid-structure coupling motion,according to the boundary conditions and potential theory,the hydrodynamic was given by selecting reasonable velocity potential. Considering hydrodynamic and soil-structure interaction,the control equation of vertical isolation storage tanks was established and the theoretical expression of wall shear, bending moment and stress were given. Seismic response analysis was carried out with Wilson-θ method selecting 150 000 m³ storage tanks. The results showed that: a vertical base isolation system storage tank could reduce the seismic response of radius, axial and hoop stress. It is necessary to take various factors into account to select the best site, isolation period, damping ratio and height-radius ratio in design of different storage tanks.