钢管混凝土斜拉索拱桥地震响应分析

发布时间：2018-05-12 04:02

本文选题：有限元 + 模态　；参考：《华东交通大学》2014年硕士论文

【摘要】：地震是一种天然的灾害，不可避免但可以减轻破坏的程度，在地震作用下，桥梁的破坏应该保证在发生高于本地区的设防烈度的大地震时，可以继续使用，桥梁作为地震后的灾后救灾与重建的生命线，应该增大设计中安全储备系数。本文采用天子山斜拉索钢管混凝土拱桥实际工程项目，建立适应研究的有限元模型。主要研究了以下内容： 1.建立了天子山桥的模型，采用简化的单脊梁模型（鱼骨型），分析自振频率，通过改变钢管拱的刚度及钢管拱之间的横向联系的方式，比较分析各个参数的改变，对自振频率的变化，以便优化横撑的作用方式。 2.本文介绍了人工合成多点激励地震波的拟合分析方法，对互谱模型、相干函数、强度包络线等模拟中的参数和模型进行了讨论，，采用专业软件SIMQKE拟合出符合场地特征的人工波。 3.考虑两种不同的EL-Centro与Taft天然地震波，采用了时程分析，比较分析桥梁不同场地条件下的总响应（包括斜拉索的初始张力。 4.考虑天子山桥斜拉索拱的特殊性，比较分析在有索力作用下的天子山桥和无索力作用下的区别，采用EL-Centro三维地震波。
[Abstract]:Earthquake is a natural disaster, inevitable but can reduce the degree of damage, in the earthquake, the damage of bridges should be guaranteed to occur above the intensity of the strong earthquake in the region, can continue to use, As the lifeline of post-earthquake disaster relief and reconstruction, bridge should increase the safety reserve coefficient in design. In this paper, a finite element model for the study of concrete filled steel tube arch bridge with stay cables is established by using the actual project of Tianzishan cable-stayed cable arch bridge. The main contents are as follows: 1. The model of Tianzishan Bridge is established, and the simplified single ridge beam model (fish bone type) is used to analyze the natural vibration frequency. By changing the stiffness of the steel tube arch and the transverse connection between the steel tube arch, the change of each parameter is compared and analyzed. The change of natural vibration frequency in order to optimize the mode of action of transverse brace. 2. In this paper, the fitting and analysis method of synthetic multi-point excitation seismic wave is introduced. The parameters and models in cross-spectral model, coherence function and intensity envelope are discussed, and the artificial waves which accord with the site characteristics are fitted by professional software SIMQKE. 3. Considering two kinds of natural seismic waves of EL-Centro and Taft, the total response (including the initial tension of stay cables) of the bridge under different site conditions is analyzed by time-history analysis. 4. Considering the particularity of cable-stayed arch of Tianzi Mountain Bridge, the difference between Tianzi Mountain Bridge with cable force and that without cable force is compared and analyzed. EL-Centro 3-D seismic wave is adopted.
【学位授予单位】：华东交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55

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