多维地震下考虑土—结构相互作用的混凝土烟囱抗震性能研究

发布时间：2018-02-23 12:42

本文关键词： 钢筋混凝土烟囱多维地震作用地震易损性区域地震易损性地震方向性土-结构相互作用　出处：《北京交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：烟囱是具有排走烟气功能的特种结构,被广泛应用于工业领域中。长期的使用会使得烟囱结构存在一定程度的损伤,在遇到地震时可能发生局部破坏或者完全倒塌,造成巨大的经济损失。本文通过数值模拟方法,对高耸钢筋混凝土烟囱在多维地震作用下的地震易损性、烟囱不同部位的区域易损性以及地震波入射的方向性和考虑土-结构相互作用对烟囱结构抗震性能的影响进行研究,主要内容如下:(1)通过有限元软件ABAQUS对某高耸钢筋混凝土烟囱结构建模,基于增量动力分析方法对该烟囱结构进行一维、二维和三维地震动作用的地震易损性分析,从而得到烟囱结构的各级损伤概率和烟囱结构的倒塌概率。(2)采用区域地震易损性分析方法,研究了在一维、二维和三维地震作用下,该烟囱结构不同部位的易损性概率,从而得到该结构的最不利位置。(3)研究了不同角度的地震波对烟囱结构抗震性能的影响,通过不同角度的三维地震作用下烟囱结构的地震易损性分析,得到了烟囱结构在不同角度地震作用下的损伤概率,从概率的角度对该烟囱结构的地震波最不利入射角进行了讨论。(4)建立考虑土-结构相互作用的烟囱结构有限元精细化模型,对该烟囱结构考虑土-结构相互作用前后的动力特性以及地震作用下的不同响应进行了对比分析;并对不同土体参数下考虑土-结构相互作用对烟囱结构地震响应的影响进行了讨论。
[Abstract]:Chimney is a special structure with the function of removing flue gas, which is widely used in industrial field. The long-term use of chimney structure will cause some damage to the chimney structure, which may occur local damage or complete collapse in the event of earthquake. In this paper, the seismic vulnerability of high-rise reinforced concrete chimney under the action of multi-dimensional earthquake is studied by means of numerical simulation. The vulnerability of different parts of chimney, the direction of incident seismic wave and the influence of soil-structure interaction on seismic performance of chimney structure are studied. The main contents are as follows: (1) A tall reinforced concrete chimney structure is modeled by the finite element software ABAQUS, and the seismic vulnerability of the chimney structure is analyzed based on the incremental dynamic analysis method. Thus, the damage probability of the chimney structure at different levels and the collapse probability of the chimney structure are obtained. The vulnerability probability of different parts of the chimney structure under the action of one-dimensional, two-dimensional and three-dimensional earthquakes is studied by using the method of regional seismic vulnerability analysis. Thus, the most unfavorable position of the structure is obtained. The influence of seismic waves at different angles on the seismic performance of chimney structure is studied, and the seismic vulnerability of chimney structure under the action of three dimensional earthquake at different angles is analyzed. The damage probability of chimney structure under earthquake action at different angles is obtained. From the angle of probability, the most unfavorable incident angle of seismic wave of chimney structure is discussed. 4) the finite-element fine model of chimney structure considering soil-structure interaction is established. The dynamic characteristics of the chimney structure before and after considering soil-structure interaction and the different responses under seismic action are compared and analyzed. The influence of soil-structure interaction on the seismic response of chimney structure under different soil parameters is discussed.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU311.3;TU435

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