Seismic response of liquid storage tanks isolated by sliding bearings
Seismic response of liquid storage tanks isolated by sliding bearings
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DOI：
10.1016/s0141-0296(02)00009-3
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发表时间：
2002-07
影响因子：
5.5
通讯作者：
M. Shrimali;R. S. Jangid
中科院分区：
文献类型：
--
作者：
M. Shrimali;R. S. Jangid
研究了在真实的地震动水平分量作用下，滑移隔震储液罐的反应。将连续液体质量分为对流质量、冲击质量和刚性质量。根据罐壁和液体质量的性质计算与这些集中质量相关联的相应刚度。推导了带滑移系统贮箱的运动控制方程，并用Newmark逐步迭代法求解。在滑动系统的界面处动员的摩擦力被假定为速度依赖的，并且它们在两个水平方向上的相互作用被适当地考虑。通过参数分析，研究了重要系统参数对储液罐隔震效果的影响。所考虑的各种参数是（i）隔离期（ii）隔离支座的阻尼和（iii）滑动支座的摩擦系数。已经发现，摩擦力的双向相互作用具有显著的影响，并且如果忽略这些影响，则滑动基座位移将被低估，这从设计的角度来看是至关重要的。此外，摩擦系数对滑动轴承相对速度的依赖性对隔震储液罐的峰值响应没有显著影响。
The response of liquid storage tanks isolated by the sliding systems is investigated under two horizontal components of real earthquake ground motion. The continuous liquid mass is lumped as convective mass, impulsive mass and rigid mass. The corresponding stiffness associated with these lumped masses is calculated depending upon the properties of the tank wall and liquid mass. The governing equations of motion of the tank with a sliding system are derived and solved by Newmark's step-by-step method with iterations. The frictional forces mobilized at the interface of the sliding system are assumed to be velocity dependent and their interaction in two horizontal directions is duly considered. A parametric study is also conducted to study the effects of important system parameters on the effectiveness of seismic isolation of the liquid storage tanks. The various parameters considered are (i) the period of isolation (ii) the damping of isolation bearings and (iii) the coefficient of friction of sliding bearings. It has been found that the bi-directional interaction of frictional forces has noticeable effects and if these effects are ignored then the sliding base displacements will be underestimated which can be crucial from the design point of view. Further, the dependence of the friction coefficient on relative velocity of the sliding bearings has no significant effects on the peak response of the isolated liquid storage tanks.