曲线斜拉桥地震响应特征及影响因素分析

发布时间：2018-03-25 18:38

本文选题：曲线斜拉桥　切入点：地震响应分析　出处：《西南交通大学》2017年硕士论文

【摘要】：曲线斜拉桥是主梁沿线路走向呈曲线型布置的斜拉桥,由于其具有曲线形的主梁,从而在弯扭耦合效应下表现出空间耦联性。这使得斜拉索的空间布置和受力复杂化,塔、梁、索三者组成的整体结构在动力作用下的受力状态变得十分复杂。因此,有必要对曲线斜拉桥在地震动作用下的响应特征进行深入地研究分析。本文以刚果布拉柴.维尔滨河大道曲线斜拉桥为实际工程依托,建立了该桥的有限元模型,对其进行了地震响应特征及其影响因素分析。本文主要进行了以下几个方面的工作:1.总结了桥梁结构在地震作用下的主要灾害类型,对现有的桥梁结构地震响应分析方法进行了概括和综述,并专门对斜拉桥地震响应的研究现状做了分析和综述。2.针对曲线斜拉桥的特点,建立了有限元模型,在此基础上对依托工程曲线斜拉桥的动力特性进行了深入分析。分析了主梁圆心角和塔梁连接形式两个不同的结构参数对曲线斜拉桥动力特性的影响规律。3.基于Bresler屈服面函数,利用水平双向反应谱法考虑了水平方向内两个正交方向的地震动,并且基于振型组合的CQC法,推导了曲线斜拉桥地震动的最不利入射角度,利用反应谱法对不同入射角度进行计算,得出了最不利的地震动入射方向。在此基础上分析研究了该曲线斜拉桥的位移和内力响应特征。4.考虑桩-土效应、地震动的行波效应,对在不同主梁圆心角和不同塔梁连接形式情况下的曲线斜拉桥地震响应的变化规律进行了深入细致的研究。
[Abstract]:Curved cable-stayed bridge is a cable-stayed bridge with curved direction along the main beam. Because of its curved main beam, it shows spatial coupling under the coupling effect of bending and torsion, which makes the spatial arrangement and force of the stay cable more complicated. The stress state of the whole structure made up of three cables under dynamic action becomes very complicated. It is necessary to deeply study and analyze the response characteristics of curved cable-stayed bridge under ground motion. In this paper, the finite element model of the curved cable-stayed bridge is established, which is based on the curved cable-stayed bridge of Congo Brazzhai River Boulevard. The characteristics of earthquake response and its influencing factors are analyzed. The main work of this paper is as follows: 1. The main disaster types of bridge structure under earthquake action are summarized. The existing seismic response analysis methods of bridge structures are summarized, and the current research situation of seismic response of cable-stayed bridges is analyzed and summarized. 2. According to the characteristics of curved cable-stayed bridges, a finite element model is established. On this basis, the dynamic characteristics of curved cable-stayed bridge supported on engineering are analyzed in depth, and the influence of two different structural parameters of main beam center-angle and pylon girder connection on the dynamic characteristics of curved cable-stayed bridge is analyzed. Based on Bresler yield surface function, the dynamic characteristics of curved cable-stayed bridge are analyzed. The horizontal bidirectional response spectrum method is used to consider the ground motion of two orthogonal directions in the horizontal direction, and the most unfavorable incident angle of the curved cable-stayed bridge ground motion is derived based on the CQC method of mode combination. The most unfavorable incident direction of ground motion is obtained by using the method of response spectrum. On this basis, the characteristics of displacement and internal force response of the curved cable-stayed bridge are analyzed. 4. Considering the pile-soil effect, the traveling wave effect of ground motion is studied. The variation law of seismic response of curved cable-stayed bridge with different center angle of main beam and different connection form of tower beam is studied in detail.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U448.27

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