桥梁异型拱装饰结构强度分析

发布时间：2018-06-03 22:12

本文选题：桥梁装饰结构 + 结构强度　；参考：《长安大学》2014年硕士论文

【摘要】：近些年来，桥梁的实用性功能逐渐不能满足人们日益增长的精神文化的追求，桥梁美学研究逐渐成为桥梁研究的重要组成部分，其中桥梁的景观设计更加成为了桥梁美学不可或缺的部分。目前来说，在我们国家尚没有非常成熟和完善的桥梁景观设计的相应规范，在本文中主要工作是对某一桥梁装饰结构进行结构分析，为桥梁装饰结构的设计提供一定数据支持。本文主要进行以下几个方面的工作，1)首先在有限元软件中建立了某大桥景观的有限元模型，已知桥梁装饰结构的相关参数，跨度为100m，高度为21m，拱肋为沿纵桥向呈对称的拱形结构，拱肋通过三道k撑相互连接，拱肋和桥面通过吊杆连接。2）根据桥梁装饰结构所在的地理条件，确定影响装饰结构的主要静力载荷的因素，求解结构在自重、温度和风力作用下结构的应力和位移响应。3）对结构进行动力学分析，在有限元软件中对结构进行自振特性分析，并以此为基础，利用谱分析法求解装饰结构在横向、纵向、竖向三向共同的地震载荷作用下的动力响应。4）将天津波的加速度记录做修正，在动力学方程中将变化的加速度作为惯性加速度，对装饰结构进行时程分析，并和谱分析结果进行对比与验证，并分析装饰结构在静力载荷和动力载荷的共同作用下结构的响应是否满足结构的强度要求。在静力分析中，计算了结构在自重、风载荷和温度载荷下结构的响应，通过计算，该结构在静力载荷的作用下，最大位移及最大应力都发生在承受风载荷一侧的拱肋的拱顶处附近，并且在拱顶与斜撑的连接处产生较大的应力集中。并使拱角处的轴力及弯矩都相对偏高。在结构动力学分析中，通过对结构自振特性的分析，可知该结构的基频较高，整体刚度较大，第一阶振型为横向侧倾，横向刚度相对较低，在前十阶振型中，出现三次风撑的振动，出现的次数较多。在时程分析中计算了横向、纵向以及竖向的地震振动对结构的影响。横向作用下对结构整体的横向变形影响较大，尤其在1/4拱肋处；竖向地震振动主要作用于结构两侧的横撑结构产生较大的竖向变形；纵向地震振动主要作用于1/4拱肋及横撑处。通过以上的计算与分析，无论在时程分析或者在谱分析中，结构的1/4拱肋处以及两侧横撑的位移变形较大，横撑变形比拱肋的大，，易受到载荷的影响，容易引起破坏。
[Abstract]:In recent years, the practical function of bridge can not satisfy the increasing pursuit of spiritual culture, and the study of bridge aesthetics has gradually become an important part of bridge research. The landscape design of bridges has become an indispensable part of bridge aesthetics. At present, in our country, there is not a very mature and perfect corresponding norms of bridge landscape design. In this paper, the main work is to analyze the structure of a bridge decoration structure, to provide certain data support for the design of bridge decoration structure. Firstly, the finite element model of a bridge landscape is established in the finite element software, and the relevant parameters of the bridge decoration structure are known. The span is 100 m, the height is 21 m, the arch rib is a symmetrical arch structure along the longitudinal bridge, the arch rib is connected with each other through three k braces, and the arch rib and the bridge deck are connected with each other through the suspenders. 2) according to the geographical conditions of the bridge decoration structure, The main static load factors affecting the decorative structure are determined, and the stress and displacement response of the structure under the action of deadweight, temperature and wind are solved. The dynamic analysis of the structure is carried out, and the natural vibration characteristics of the structure are analyzed in the finite element software. On this basis, the acceleration records of Tianjin wave are corrected by using spectral analysis method to solve the dynamic response of decorative structures under the common lateral, longitudinal and vertical seismic loads. In the dynamic equation, the varying acceleration is taken as the inertial acceleration, and the time history analysis of the decorative structure is carried out, and the results are compared and verified with the spectrum analysis. The response of decorative structure under both static and dynamic loads is analyzed. In the static analysis, the response of the structure under deadweight, wind load and temperature load is calculated. By calculation, the structure is subjected to static load. Both the maximum displacement and the maximum stress occur near the arch roof of the arch rib under wind load, and there is a greater stress concentration in the connection between the arch roof and the diagonal brace. The axial force and bending moment at the arch angle are relatively high. In the dynamic analysis of the structure, through the analysis of the natural vibration characteristics of the structure, it can be seen that the structure has higher fundamental frequency and larger overall stiffness, the first vibration mode is lateral tilting, and the transverse stiffness is relatively low, in the first ten vibration modes, The vibration of three air braces occurs more frequently. In the time history analysis, the influence of transverse, longitudinal and vertical seismic vibration on the structure is calculated. The transverse action has a great influence on the transverse deformation of the whole structure, especially at the 1 / 4 arch rib; the vertical earthquake vibration mainly acts on the transverse deformation of the transverse braced structure on both sides of the structure; and the longitudinal earthquake vibration mainly acts on the 1 / 4 arch rib and the transverse braces. Through the above calculation and analysis, whether in the time history analysis or in the spectrum analysis, the displacement deformation of the one-fourth arch rib and both sides of the structure is larger than that of the arch rib, and the deformation of the transverse bracing is larger than that of the arch rib, which is easy to be affected by the load and easily cause damage.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.4

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