现代索道桥结构分析

发布时间：2018-04-25 01:21

本文选题：索道桥 + 悬索　；参考：《重庆交通大学》2014年硕士论文

【摘要】：现代索道桥是以承重索和锚碇为主要受力构件、以钢横梁和桥面板等作为局部受力构件的一种新型悬索体系桥梁，主要由承重索系统、稳定结构、桥面系、索塔锚碇四大部分组成，具有结构简单、载重量大、材料用量小、建设周期短、建造成本低等特点。本文从现代索道桥的结构特点出发，首先对悬索和横梁等受力构件进行了静力分析，然后研究了索道桥的几何非线性特征，最后分析了其自振频率及影响因素。具体研究内容如下： ①结合现代索道桥的结构特点，分析了各构件的受力特征；对索道桥的承重索进行理论计算，得到了悬索的水平拉力、悬索索长、空索状态和成桥状态时悬索拉力和矢度的近似计算公式；分析了现代索道桥稳定横梁的内力及其作用原理，并结合工程实例研究了稳定横梁在降低偏载作用下桥面横向倾斜程度及调配承重索受力等方面起到重要作用。 ②分析了桥梁结构几何非线性计算理论以及对现代索道桥进行非线性有限元分析的重要性，以杆系结构为出发点研究了几何非线性分析的T.L列式法和U.L列式法，并对这两种计算方法进行了对比和总结；针对现代索道桥的悬索结构，计算出平面柔性悬索单元的切线刚度矩阵，然后结合有限元软件的分析方法，给出了Newton-Raphson法求解非线性方程的方法；最后结合工程实例，验证了非线性有限元分析方法在现代索道桥计算中适用性和必要性。 ③分析了现代索道桥的振动特性，并以弦的振动为出发点计算得到悬索的三维动力学方程，根据现代索道桥悬索特点，得到索道桥竖向自振频率和扭转振动频率的近似计算公式；最后结合工程实例，，对索道桥自振频率的影响因素进行计算和对比分析，得到了矢跨比、自重集度、承重索型号和横梁尺寸等因素对索道桥自振频率的影响规律。
[Abstract]:The modern cable-way bridge is a new type of suspension system bridge with load-bearing cable and Anchorage as the main force member, steel cross beam and bridge deck as the local force member, mainly composed of load-bearing cable system, stable structure, bridge deck system, etc. The cable tower Anchorage is composed of four parts. It has the characteristics of simple structure, large load, small material consumption, short construction period and low construction cost. Based on the structural characteristics of the modern cableway bridge, the static analysis of the cable and beam is carried out in this paper, then the geometric nonlinear characteristics of the cableway bridge are studied. Finally, the natural vibration frequency and the influencing factors of the cableway bridge are analyzed. The specific contents of the study are as follows: The main contents are as follows: 1. According to the structural characteristics of the modern cableway bridge, the stress characteristics of each component are analyzed, and the horizontal tension and the length of the suspension cable are obtained by theoretical calculation of the load-bearing cable of the ropeway bridge. The approximate formulas for calculating the tension and vector of the suspension cable in the state of the empty cable and the state of the bridge are given, and the internal force of the stable crossbeam of the modern cableway bridge and its action principle are analyzed. Combined with an engineering example, it is studied that stable beam plays an important role in reducing the transverse slope of the bridge deck under the action of eccentric load and in adjusting the load bearing capacity of the bearing cable. The importance of nonlinear finite element analysis for modern cableway bridges is analyzed. The T.L and U.L formulations of geometric nonlinear analysis are studied from the point of view of the bar structure. The tangent stiffness matrix of the plane flexible cable element is calculated according to the cable structure of the modern cableway bridge, and then the finite element analysis method is combined with the finite element analysis method. The method of solving nonlinear equations by Newton-Raphson method is given, and the applicability and necessity of nonlinear finite element analysis method in modern cableway bridge calculation are verified by an engineering example. 3. The vibration characteristics of the modern cableway bridge are analyzed, and the three-dimensional dynamic equations of the suspension cable are calculated based on the vibration of the string, according to the characteristics of the suspension cable of the modern cableway bridge. The approximate formulas of vertical natural vibration frequency and torsional vibration frequency of cableway bridge are obtained. Finally, the factors affecting the natural vibration frequency of ropeway bridge are calculated and compared with engineering examples, and the ratio of vector to span and the density of gravity are obtained. The influence of bearing cable type and beam size on the natural vibration frequency of ropeway bridge.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.25

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