梁间链杆对斜拉桥结构行为的影响分析

发布时间：2018-01-06 19:02

本文关键词：梁间链杆对斜拉桥结构行为的影响分析　出处：《西南交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：我国交通基础建设迅猛发展,城市桥梁的发展也越来越快,而且更加重视美观和行人的通行能力。斜拉桥这种桥型作为一种大跨径结构和城市地标性建筑得到了广泛应用,其使用性和安全性受到格外重视,而桥梁荷载试验是一种重要的评判方法。设置人行桥和车行桥的双层桥梁既能满足通行能力又体现了人文关怀。链杆作为连接双层斜拉桥中的一种辅助结构,在改善结构性能方面发挥着相当重要作用。本文以绵阳一号桥荷载试验为工程背景,详细叙述了斜拉桥和异形斜拉桥的发展历史及人行斜拉桥和双层斜拉桥的发展概况,简要介绍了有限元相关原理,结合国内外目前研究现状介绍了行人步频特性,以及人行桥振动舒适性评价方法和三种比较常用的求解特征值向量的方法,为本文研究提供的理论依据。本文关于链杆对桥梁结构行为影响的讨论分析所做的主要工作如下：1、利用有限元程序对绵阳一号桥成桥状态仿真计算分析,全面模拟下在成桥状态下该桥的受力状态,为桥梁荷载试验提供理论依据。2、通过绵阳一号桥的两次桥梁荷载试验来评价该桥在添加链杆前后的使用性和安全性,并对有无链杆的有限元模型进行计算,对比两种状态下的受力特点。3、改变链杆的刚度、数量、位置等参数以及桥梁的结构体系,探讨对该桥的人行桥和车行桥在安全性和使用性的影响,以“避开敏感频率法”讨论了链杆的有无对人行桥舒适性的影响,给出了合理的链杆布置方式。
[Abstract]:With the rapid development of transportation infrastructure in China, the development of urban bridges is also getting faster and faster. The cable-stayed bridge has been widely used as a kind of long-span structure and urban landmarks, and its usability and safety have been paid more attention to. The bridge load test is an important evaluation method. The double-deck bridge with pedestrian bridge and vehicular bridge can not only meet the traffic capacity but also reflect the humanistic concern. The chain bar is a kind of auxiliary structure in connecting double-deck cable-stayed bridge. It plays an important role in improving the structure performance. This paper takes the load test of Mianyang No.1 Bridge as the engineering background. The development history of cable-stayed bridge and special-shaped cable-stayed bridge and the development of pedestrian cable-stayed bridge and double-deck cable-stayed bridge are described in detail. Combined with the current research situation at home and abroad, this paper introduces pedestrian walking frequency characteristics, pedestrian bridge vibration comfort evaluation methods and three more commonly used methods to solve eigenvalue vectors. The main work of this paper is as follows: 1. The finite element program is used to simulate and analyze the bridge state of Mianyang No.1 bridge. In order to provide theoretical basis for the bridge load test, the load state of the bridge is simulated comprehensively under the condition of the completed bridge. Through two bridge load tests of Mianyang No. 1 Bridge to evaluate the use and safety of the bridge before and after adding the link bar, and to calculate the finite element model with or without the link bar, and to compare the stress characteristics of the two states. 3. By changing the stiffness, quantity, position and the structure system of the bridge, the influence on the safety and serviceability of the footbridge and the vehicular bridge is discussed. In this paper, the influence of chain rod on comfort of footbridge is discussed by "avoiding sensitive frequency method", and a reasonable arrangement of link rod is given.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.27

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