桥墩形式对曲线形高墩大跨连续刚构桥的动力特性及稳定性影响分析

发布时间：2018-03-12 13:49

本文选题：桥墩形式　切入点：曲率半径　出处：《长沙理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：最近几十年来,高等级公路随着交通事业的日益发达,获得了极大的发展,并且高等级公路上的桥梁也开始逐渐向着高墩大跨的形式发展,曲线形高墩大跨连续刚构桥由于其独特的优势而得到大量的推广与应用,在城市立交以及山区复杂地形之中尤为体现。而最近,随着地震的发生的愈加频繁,让人们更多的意识到桥梁结构抗震的重要性,并且对于曲线形高墩大跨连续刚构这种较为新颖的桥型,震害经验还相对较少,在我国的规范之中对于跨径超过150m的大跨径梁桥仅仅只是简单的提供了抗震设计原则。此外,桥墩形式以及曲率半径对结构的动力特性有着很大的影响很,因此对曲线形连续高墩大跨连续刚构进行动力特性研究是很有必要的。并且,随着科学技术的发展,各类高强度材料得到了广泛的应用,各类结构也都朝着轻薄方向发展,因此,为了让保证结构的可靠,稳定性也是高墩大跨结构中必须得到重点关注的问题。对桥梁结构在桥墩、最大悬臂以及成桥阶段进行稳定性分析能够有效保证桥梁在施工阶段的稳定、施工人员的安全以及成桥阶段桥梁的安全运营。通过对不同的桥墩形式以及曲率半径下,对曲线形高墩大跨连续刚构桥的动力特性以及稳定性分析进行对比分析,以对这类桥梁的施工设计方案优化带来些许帮助。本文以实际工程—广西西牛大桥为依托,结合现阶段曲线形高墩大跨连续刚构桥的研究现状,进行了以下工作:(1)对动力特性方面的计算理论进行了介绍,并且在理论的基础上,改变西牛大桥的曲率半径以及桥墩形式,对其建立模型,对曲线形高墩大跨连续刚构这一桥型进行动力特性方面的分析。(2)对地震反应理论进行了介绍,并且详尽的介绍了时程分析计算方法,之后对西牛大桥进行了地震作用下时程分析,在分别改在分别改变其曲率半径和桥墩形式下,建立相应的模型。对曲线形连续高墩大跨连续刚构桥欧这一桥型进行分析,以期给工程的抗震设计提供些许帮助。(3)对稳定理论进行了介绍,并且对不同桥墩形式在自重、风载作用下高墩自体稳定进行了分析;对西牛大桥的最大悬臂阶段在不同桥墩形式下进行了稳定性对比分析;对不同桥墩形式在成桥阶段的稳定性进行了稳定性对比分析。(4)对曲线形高墩大跨连续刚构桥的动力特性以及稳定性的分析研究进行了总结与展望。
[Abstract]:In recent decades, with the development of traffic, high-grade highways have been greatly developed, and the bridges on high-grade highways are gradually developing towards the form of high piers and long spans. Curved long-span continuous rigid frame bridges with high piers have been popularized and applied widely because of their unique advantages, especially in urban interchanges and complex terrain in mountainous areas. Recently, with the increasing frequency of earthquakes, To make people more aware of the importance of aseismic bridge structure, and for curved high-pier long-span continuous rigid frame, the earthquake damage experience is relatively less. In the code of our country, the aseismic design principle of long-span beam bridge with span more than 150m is simply provided. In addition, the form of piers and the radius of curvature have great influence on the dynamic characteristics of the structure. Therefore, it is necessary to study the dynamic characteristics of curved continuous high pier and long span continuous rigid frame, and with the development of science and technology, all kinds of high strength materials have been widely used, and all kinds of structures have been developed in the direction of light and thin. Therefore, in order to ensure the reliability of the structure, stability is also a problem that must be paid attention to in the long-span structure with high piers. The stability analysis of the maximum cantilever and bridge stage can effectively ensure the stability of the bridge in the construction stage, the safety of the constructor and the safe operation of the bridge in the completion stage. The dynamic characteristics and stability analysis of curved high pier and long span continuous rigid frame bridge are compared and analyzed in order to bring some help to the optimization of the construction design scheme of this kind of bridge. This paper relies on the actual project of Guangxi Xiniu Bridge. According to the current research situation of curved high pier continuous rigid frame bridge with long span, the following work is done: 1) the calculation theory of dynamic characteristics is introduced, and on the basis of the theory, the curvature radius and pier form of Xiniu Bridge are changed. In this paper, the dynamic characteristics of curved high pier and long span continuous rigid frame are analyzed. The seismic response theory is introduced, and the time-history analysis method is introduced in detail. After that, the time-history analysis of Xiniu Bridge under earthquake action is carried out, and the corresponding model is established under changing the curvature radius and pier form of Xiniu Bridge respectively. The bridge type of curved continuous high pier continuous rigid frame bridge with long span is analyzed. In order to provide some help to the aseismic design of the project, the stability theory is introduced, and the autologous stability of the high pier under the action of self-weight and wind load is analyzed. The stability of Xiniu Bridge in the maximum cantilever stage under different piers is compared and analyzed. The stability of different piers in the stage of bridge completion is compared and analyzed. (4) the dynamic characteristics and stability of curved high piers and long span continuous rigid frame bridges are summarized and prospected.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.23

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