基于ANSYS和FINAL的储液池抗震性能分析

发布时间：2018-03-30 13:43

本文选题：储液池　切入点：震度法　出处：《天津大学》2014年硕士论文

【摘要】：近年来,随着地下结构数量的增多和震害的频繁出现,储液池因功能的特殊性和重要性,其抗震设计和安全性评价日益受到重视。由于复杂场地土的动力特性直接影响储液池结构的抗震性能,因此考虑土层动力特性的变化对储液池受力性能的影响,其必要性十分显著;同时,随着储液池内部结构日趋复杂,罕遇地震作用下储液池的三维静力弹塑性分析已成为工程技术人员面临的重要课题,这就是本文研究的初衷。本文在两阶段设计法、应答震度法、抗震计算和耐震检测方法的基础上,对某净水厂地下储液池的抗震计算进行全过程分析整理。本文首先依据场地土类别和结构的固有周期计算结构的基准水平震度Kh0,使用震度法依据Kh0计算动荷载并对整体模型进行线弹性计算,得到两级震、四个加震方向共八个工况下与结构相邻各侧土层的平均剪切角γ;其次依据土层G/G0-γ曲线,计算每个工况下各侧土层动剪切模量值G并分析变化情况和影响因素,由G计算土弹簧刚度来模拟不同工况下土和储液池的动力相互作用;最后使用FINAL软件对储液池逐级施加静荷载和地震引起的水平动荷载,基于能量守恒法则计算设计水平震度,以此对罕遇地震作用时的储液池进行静力弹塑性分析,并从各种工况中分别得到最不利的地震响应以进行承载能力极限状态下的校核。基于G/G0-γ曲线,用土弹簧等效地反应结构与土相互作用的主要动力特性;基于能量守恒法则计算设计水平震度,用静力弹塑性分析方法反应罕遇地震时储液池的破坏过程和屈服机制。本文的研究思路及流程,能够为特种储液池结构的抗震性能设计提供一种简易、可行的方法。
[Abstract]:In recent years, with the increase of the number of underground structures and the frequent occurrence of earthquake damage, the seismic design and safety evaluation of liquid storage tanks have been paid more and more attention due to the particularity and importance of their functions.Because the dynamic characteristics of the soil in complex sites directly affect the seismic performance of the reservoir structure, it is necessary to consider the influence of the dynamic characteristics of the soil layer on the mechanical performance of the reservoir, and at the same time,With the internal structure of liquid storage tank becoming more and more complex, the three-dimensional static elastic-plastic analysis of liquid storage tank under rare earthquake has become an important subject for engineers and technicians, which is the original intention of this paper.On the basis of two-stage design method, seismic response method, seismic calculation and seismic detection method, the whole process of seismic calculation of underground liquid storage tank in a water purification plant is analyzed and sorted out in this paper.In this paper, the reference horizontal seismicity Kh0 of the structure is calculated according to the site soil type and the natural period of the structure, the dynamic load is calculated by using the seismic degree method based on Kh0 and the linear elastic calculation of the whole model is carried out, and the two-magnitude earthquake is obtained.The average shear angle 纬 of each side soil layer adjacent to the structure is calculated under eight working conditions with four seismic directions, and the dynamic shear modulus value G of each side soil layer is calculated according to the G / G0- 纬 curve of soil layer, and the variation and influencing factors are analyzed.The soil spring stiffness is calculated by G to simulate the dynamic interaction between soil and liquid storage tank under different working conditions. Finally, FINAL software is used to apply the static load and horizontal dynamic load caused by earthquake to the reservoir step by step, and the design horizontal earthquake degree is calculated based on the energy conservation law.The static elastic-plastic analysis of liquid storage tank under rare earthquake is carried out, and the most unfavorable seismic response is obtained from various working conditions for checking under the limit state of load-carrying capacity.Based on the G / G0- 纬 curve, the main dynamic characteristics of the interaction between the structure and the soil are equivalent with the soil spring, and the design horizontal earthquake degree is calculated based on the energy conservation law.The failure process and yield mechanism of liquid storage tank under rare earthquake are analyzed by static elastoplastic analysis method.The research idea and flow of this paper can provide a simple and feasible method for the seismic performance design of the special storage tank structure.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU352.11

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