大跨度自锚式悬索桥地震响应分析

发布时间：2018-04-14 17:38

本文选题：自锚式悬索桥 + 有限元模型　；参考：《郑州大学》2015年硕士论文

【摘要】：随着社会的进步和经济的发展,人们要求桥梁工程不仅仅作为跨越障碍的构筑物,而且应该具有景观效应,并能成为地标建筑物,自锚式悬索桥正是兼具这些要求,因而受到很多国家和地区的工程师青睐。然而,地震的发生,造成大量的桥梁结构的破坏,使人民生命财产遭受巨大损失。因此,如何保证自锚式悬索桥能够经受地震作用的考验是一个值得深入研究的问题。本文基于上述背景,以桃花峪黄河大桥为依托,针对大跨度自锚式悬索桥的地震动力响应进行分析研究,所做的主要工作和得到的结论如下:(1)利用桥梁专用分析软件建立有限元数值分析模型,确定大桥成桥合理状态,然后在成桥状态的基础上进行动力特性分析。(2)借鉴已有的自锚式悬索桥自由振动微分方程频率计算公式求出桃花峪黄河大桥自振频率的解析解,并与有限元求得的数值解进行对比,对比得出解析解与数值解相应振型的自振频率最大偏差不超过10%,吻合很好。(3)利用反应谱法对该自锚式悬索桥进行地震响应分析,得到了结构在纵向+竖向和横向+竖向工况下主梁和主塔关键位置处的内力和位移响应。(4)利用时程分析法,考虑一致激励、行波激励和随机地震动多点激励的情况下对大桥进行地震响应分析,将一致激励的结果分别与反应谱、行波激励和多点激励的分析结果进行对比,分析行波效应、部分相干效应等对大跨度自锚式悬索桥地震响应的影响。
[Abstract]:With the progress of society and the development of economy, people require that bridge engineering should not only be used as a structure for crossing obstacles, but also have landscape effect and become a landmark building. Self-anchored suspension bridge has these requirements.As a result, engineers in many countries and regions favor.However, the earthquake caused a great deal of damage to the bridge structure and caused great loss of people's lives and property.Therefore, how to ensure that self-anchored suspension bridge can withstand the test of earthquake action is a problem worthy of further study.Based on the above background, based on the Taohuayu Yellow River Bridge, the seismic dynamic response of the long-span self-anchored suspension bridge is analyzed and studied in this paper.The main work done and the conclusions obtained are as follows: 1) the finite element numerical analysis model is established by using the special analysis software for the bridge to determine the reasonable state of the bridge.Then on the basis of the state of the completed bridge, the dynamic characteristics of the bridge are analyzed. (2) the analytical solution of the natural vibration frequency of the Taohuayu Yellow River Bridge is obtained by using the existing formula of differential equation frequency calculation for the free vibration of the self-anchored suspension bridge.Compared with the numerical solution obtained by the finite element method, it is concluded that the maximum deviation of the natural vibration frequency of the analytical solution and the numerical solution is not more than 10, which is in good agreement with that of the finite element method, and the response spectrum method is used to analyze the seismic response of the self-anchored suspension bridge.The internal force and displacement response of the main beam and the main tower at the key position of the main beam and the main tower under longitudinal and transverse vertical working conditions are obtained. The time-history analysis method is used to consider the uniform excitation.In the case of traveling wave excitation and random ground motion multi-point excitation, the seismic response of the bridge is analyzed. The results of uniform excitation are compared with the results of response spectrum, traveling wave excitation and multi-point excitation, respectively, and the traveling wave effect is analyzed.The effect of partial coherence effect on the seismic response of long span self-anchored suspension bridge.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55;U448.25

【参考文献】