长周期地震动作用下LNG储罐外罐的动力性能研究

外罐是确保LNG储罐安全的关键设施,研究长周期地震动作用下外罐的动力性能对LNG储罐具有重要意义.本文以160000 m3 LNG储罐为背景,考虑了重力与预应力筋作用,采用集成化的通用结构分析与设计软件SAP2000建立外罐的三维有限元模型,分析了外罐的变形、加速度和基底剪力以便证实长周期地震动作用下外罐受力性能良好并...

Study on Dynamical Performance of Outer Tank under Long-period Ground Motion

The outer tank is the key facility to ensure the safety of the LNG storage tank,and it is of great significance to study the dynamical performance of the outer tank under the long-period ground motion.The outer tank of a 160000m³LNG storage tank was taken as the research object in this study.First of all,the three-dimension finite element model of the outer tank in consideration of the gravity and prestressed tendon effects was set up by using the general structural engineering analysis and design software SAP2000.And then the acceleration,deformation,and base shear of the outer tank were analyzed so as to demonstrate that the mechanical behavior of the outer tank under the long-period ground motion was good and within the controllable range.Finally,a new parallel isolation device consisting of the laminated rubber isolation bearing and the mild steel damper was introduced to study the influence of the long-period ground motion on the base isolation performance of the outer tank.The results proved that the effect of the long-period ground motion must be considered in the base isolation design of the outer tank because of their strong randomness,ambiguity,and uncertainty.The isolation device was effective for the short-period ground motion,but invalid for the long-period ground motion.When the predominant period of Mexican ground motion was close to the base isolation period,resonance phenomenon occurs in the outer tank,the horizontal displacement of the vertex was 2.74 times than that of El Centro ground motion,the base shear was 7.31 times than that of El Centro ground motion,and the displacement of base isolation system reached 385.49 mm.Therefore,it provides technological support and theoretical basis for the design of the outer tank.