自锚式悬索桥主缆线形计算及温度影响分析

Calculation and analysis of temperature influence of the main cable shape of self-anchored suspension bridge

目前,自锚式悬索桥主缆线形的计算理论主要有抛物线法、分段悬链线法和迈达斯软件(非线性有限元)法3种.其中抛物线法为粗略算法,分段悬链线法和迈达斯软件算法为较抛物线法更加精确的近似算法.本文首先对3种理论方法进行了分析总结,分别利用其对自锚式悬索桥工程实例进行了计算,并将计算结果进行对比分析,得出3种理论方法特点的同时验证了计算结果的准确可用性;然后对该自锚式悬索桥基准索在不同温度下的线形数据进行整理分析,研究温度对主缆线形的影响作用,为自锚式悬索桥主缆施工监控提供部分理论依据及经验成果.

At present, the major computational theories of the main cable shape of the self-anchored suspension bridge include the parabola method,the segmental catenary method and the Midas Civil software （nonlinear finite element） algorithm. The parabola method is rough, and the segmental catenary method and the Midas Civil software algorithm are more approximate than the parabola method. In this paper, we have analyzed three kinds of theoretical methodsfirstly, and calculatedthe self-anchored suspension bridge engineering examples by the three methods respectively.The calculation results are compared and analyzed to get the characteristics of the three theoretical methods and verify the accuracy and availability of the calculation results; Then we have studied the temperature effect of the main cable shape by collating the data of the reference cable shapeat variety of temperatures so as to provide some theoretical basis and experience for the main cable construction control of the self-anchored suspension bridge.