变曲率摩擦摆隔震LNG储罐的地震响应分析  

Seismic response analysis of LNG storage tank with variable curvature friction pendulum system

作　　者：林树潮 LIN Shuchao(Post-Doctoral Mobile Station of Civil Engineering,School of Civil Engineering,Tianjin University,Tianjin 300072;College of Mechanical and Architectural Engineering,Taishan University,Taian 271000;Shaanxi Key Laboratory of Safety and Durability of Concrete Structures,Xijing University,Xi'an 710123)

机构地区：[1]天津大学建筑工程学院土木工程博士后流动站,天津300072 [2]泰山学院机械与建筑工程学院,山东泰安271000 [3]西京学院陕西省混凝土结构安全与耐久性重点实验室,陕西西安710123

出　　处：《福建建筑》2023年第11期40-46,共7页Fujian Architecture & Construction

基　　金：2023年泰山学院博士科研启动基金项目(第一批);西京学院2021年国家级“大学生创新创业训练计划”项目(202112715007X)。

摘　　要：为了避免长周期地震动作用下隔震液化天然气(liquefied natural gas,以下简称LNG)储罐共振现象的发生,提出一种新型变曲率摩擦摆系统(Variable Curvature Friction Pendulum System,以下简称VCFPS)。以某16×10^(4)m^(3)LNG储罐为背景,建立其简化力学模型,利用拉格朗日方程推导相应的运动控制方程,对长周期地震动作用下LNG储罐的隔震性能进行分析。研究结果表明:无论长周期地震动还是短周期地震动,变曲率摩擦摆隔震LNG储罐可以有效地控制基底剪力,但不能降低液体晃动波高。在0.06~0.08摩擦系数范围内,基底剪力达到最优;在0.06~0.12摩擦系数范围内,液体晃动波高变化不显著。随着平衡位置附近滑动面水平段长度增大,液体晃动波高显著降低。由此可见,合理选取VCFPS的力学性能参数,有利于LNG储罐抗震设计。To avoid the occurrence of the resonance phenomenon of the base isolation liquefied natural gas(LNG)storage tank under long-period ground motions,a new variable curvature friction pendulum isolation system(VCFPS)has been put forward for the first time in this study.Based on a LNG storage tank with a capacity of 16×10^(4)m^(3),the simplified mechanical model is built and its corresponding motion control equations are deduced by using Lagrange equation to study the isolation performance of the LNG storage tank under long-period ground motions.The results show that whether it is long-period ground motion or not,the LNG storage tank with the VCFPS system can effectively control the base shear,but cannot reduce the height of sloshing wave.The base shear is optimal in friction coefficient within the range from 0.06 to 0.08.The height of sloshing wave does not change significantly with the friction coefficient ranging from 0.06 to 0.12.The height of sloshing wave decreases significantly with the increase in the length of the horizontal segment of the sliding surface near the equilibrium position.In view of this,the reasonable selection of the mechanical properties parameters of the VCFPS is conducive to the earthquake resistant design of the LNG storage tank.

关 键 词：LNG储罐 简化力学模型 变曲率摩擦摆系统 长周期地震动 液体晃动 

分 类 号：TU3[建筑科学—结构工程]