立式储罐基础隔震力学模型对比分析

Base isolation mechanical model comparative analysis of vertical storage tank

摘要:

为了给立式储罐基础隔震提供设计理论支撑,基于现有储罐弹性理论的抗震模型,引入基础隔震措施,建立了便于工程设计人员应用的储罐基础隔震力学模型,同时与储罐弹性理论三质点隔震力学模型参数进行对比．针对1.5×10⁵ m³大型立式储罐,隔震层采用等效线性本构关系,选取峰值加速度为0.40g的El-Centro水平地震波作为地震动输入,运动方程采用数值积分方法求解,进行储罐弹性理论隔震模型参数及地震响应对比分析．结果表明:不同储罐弹性理论隔震模型的质量参数和高度参数差异不大,设计时可以互相对比参照计算,几种模型中对流质量占总质量70％以上,设计时应给予注意;隔震主要降低的是弹性脉冲分量引起的地震响应,隔震后长周期的对流分量起主导作用;从反映的实际情况出发,所提出的储罐弹性理论三质点隔震力学模型是可行的,适用的．

Abstract:

To provide base isolation design theory support of vertical storage tank, based on existing elastic theory seismic model,introducing the base isolation measures, the base isolation mechanical model was established,which was convenient to engineering design staff, at the same time,base isolation mechanical model was compared to elasticity theory three-mass tank isolation mechanical model which was author put. For 1.5×10⁵ m³ vertical storage tanks, isolation layer using the equivalent linear model, selecting 0.40g El-Centro seismic wave as the ground motion input, the equations of motion using numerical integration method, the model parameters and seismic response were analyzed. The results showed that: several elastic theory tank isolation model mass and height parameters were similar,storage tank design could be compared with reference to calculation. Convective mass of several models more than 70％ total mass,it should be give attention. Isolation reduces the earthquake response of elastic impulse component, while long period convective component plays a leading role. From the actual situation, elasticity theory three-mass tank isolation mechanical model of author was feasible and applicable.