Application of Annular Damper Reaction Wall in Seismic Isolated LNG Tank
Application of Annular Damper Reaction Wall in Seismic Isolated LNG Tank
复制标题
DOI：
10.1115/pvp2010-25419
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
Ruifu Zhang;D. Weng;W. Ni
中科院分区：
文献类型：
--
作者：
Ruifu Zhang;D. Weng;W. Ni
大多数大型液化天然气储罐的基频在2到10赫兹之间，这涉及到大多数地震地面运动的共振范围。事实上，坦克在地震中很容易损坏，这在过去几十年的许多案例中得到了证明。对于大型LNG储罐采用隔震系统，在强地震作用下降低反应是一种有效的方法。但实际工程中软场地隔震层的位移较大，使得连接构件的设计相对困难。为了解决这一问题，本文提出了由环形阻尼器反力墙、粘性阻尼器和安装在桩顶的铅橡胶支座组成的隔震系统。环形减振器反力墙不与桩相连，独立嵌入地下。采用多自由度集总质量模型求解包含对流质量、脉冲质量和刚性质量的运动控制方程。采用隔振器和环形阻尼器反应壁，对实际可容160000m3气体的LNG储罐的简化模型进行了分析。通过对隔震层位移、基底剪力等参数的分析，考察了隔震体系的有效性。结果表明，隔震系统对隔震层位移的控制非常有效，同时基底剪力等参数也得到了有效控制。ASME版权所有©2010
Most of the large LNG tanks have a fundamental frequency between 2 and 10 Hz which involves range of resonance of most earthquake ground motions. It is a fact that tanks could be damaged easily in the earthquake, which had been proved in many cases in the past few decades. It is an effective way to reduce the response for an isolation system being used for large LNG storage tanks in the strong earthquake. However, the displacement of the isolation story for actual project is very large in soft site so that the design of connection components is relatively difficult. In order to solve this problem, isolation system which is composed of annular damper reaction wall, viscous dampers, and lead rubber bearings mounted on the top of the piles is presented in this paper. The annular damper reaction wall which is not connected with the piles is embedded into the ground independently. The multi-degree-of-freedom lumped mass model is used to solve the governing equations of motion in which convective, impulsive and rigid masses are included. Simplified model of an actual LNG tank which can contain 160000m3 gases is analyzed by using isolators and annular damper reaction wall. The efficiency of the isolation system is investigated by analyzing various parameters such as displacement of the isolation story, base shear and so on. The results show that isolation system is very effective to control the displacement of isolation story, and at the same time base shear and other parameters are also effectively controlled.Copyright © 2010 by ASME