悬索桥成桥主缆线形计算研究

基于分段悬链线理论,推导了成桥线形计算方法和迭代格式.以此编制程序并围绕解析法中成桥线形分析中吊索力的确定,结合施工中加劲梁的架设特点,采用三种不同的近似方法来计算吊索力.对各种不同方法下得到的成桥线形进行了研究和比较.研究结果表明,基于解析的悬链线理论,吊索力虽然近似计算所得,但计算精度远比参数方程法和抛物线法高,在方法上也比有限元法简便.为以后采用类似方法计算偏差状况提供了参考.

Determination of main cable shape under dead load state of suspension bridge

Based on the theory of sectional catenary,the method of calculation and iteration of main cable under dead load state is deduced,and a program is developed upon this method.By surrounding the determination of suspension cable force and considering the ways of stiff girder construction,three different ways are provided for calculating the force of suspension cable.At last,the analysis and contrast is done among the three ways and other different ways.From the result,it indicate that,compared to the method of parameter,parabola method,and finite-element method,the method adopted in this paper,which is based on the theory of catenary,is shown more accurate or convenient,although the suspension cable force is obtained approximately.