大型储液罐摩擦摆基底隔震控制分析

Controlling analysis of friction pendulum system for the seismic isolation of liquid storage tanks

针对弹性钢制圆柱储液罐,基于Haroun-Housner模型,将连续流体质量等效为3种集中质量,分别为:对流质量、脉冲质量和刚性质量,与这些集中质量连接的相应刚度取值依赖于储罐壁和流体质量。在水平地震激励下,在储罐底部加摩擦单摆支座,给出了简化的液体-储罐-隔震支座的力学分析模型,建立了摩擦摆支座基底隔震体系的振动控制方程,并利用Newmark逐步积分法对控制方程进行了数值求解,研究了摩擦摆支座基底隔震的储液罐地震反应,验证了FPB隔震的有效性。

Based on Haroun-Housner model of cylindrical liquid storage steel tanks, the continuous liquid mass is lumped respectively as convective mass, impulsive mass and rigid mass. The corresponding stiffness associated with the lumped mass is calculated depending upon the properties of the tank wall and the liquid mass. The mechanical model and the governing equation of motion of the liquid storage steel tanks isolated with friction pendulum bearings are presented under earthquake ground motions. And the governing equations of motion are solved by using Newmark＇ s step-by-step method assuming linear variation of acceleration over small time interval. Earthquake response of the liquid storage tanks isolated with the friction pendulum bearing （FPB） is investigated under the earthquake ground motions. It is observed that FPB is quite effective for reducing the earthquake response of tanks.