Abstract

A nonlinear analysis approach is newly proposed to obtain the configurations of suspension bridges in both construction and completed status, and the effects of the pylon saddles are considered in this algorithm. With the expression determining the position of the cable’s attachment point on the saddle, the approach can automatically take the saddle into account in the analysis process. In order to verify the accuracy, the analytical methods, which respectively describing the whole bridge completed status and the main cable completed status, are established to obtain the comparative results. Finally, a bridge case is adopted to illustrate the application of the proposed approach. The comparative analysis shows that the proposed algorithm and analytical method can obtain the results with high consistence. What is more, the results indicate that the saddles can significantly change the effective length of the cable, which can have a non-negligible effect on the bridge’s configuration. With the proposed scheme, the accuracy of the calculated parameters can be further improved for the suspension bridge.

摘要

提出了一种非线性分析方法来获得悬索桥在施工和完工状态下的构型，并考虑了塔架鞍座的影响。通过表达式确定电缆固定点在鞍座上的位置，该方法可以在分析过程中自动考虑鞍座。为了验证准确性，建立了分别描述整个桥完成状态和主缆完成状态的分析方法以获得比较结果。最后，采用桥梁案例来说明所提出方法的应用。对比分析表明，所提算法和解析方法可以获得较高的一致性。更，结果表明，鞍座可显着改变电缆的有效长度，这对桥的结构影响不可忽略。利用所提出的方案，可以进一步提高悬索桥的计算参数的准确性。