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Abstract

To solve the problem of determining the cable force of composite girder cable-stayed bridges with stacked girders under the reasonable construction state, this paper proposed the forward difference iteration method for determining the reasonable design state of cable-stayed bridges based on the calculation principles of the forward iteration method and the difference iteration method for determining the cable force of cable-stayed bridges under the reasonable construction state. Meanwhile, a program for cable force calculation during the reasonable construction stage was written, and the automatic optimization function of cable force during the reasonable construction stage was realized. Additionally, after applying this method to a double-tower composite girder cable-stayed bridge with stacked girders, at the tenth iteration, most of the cable force deviations fell within 5%, while at the 15th iteration, most of the cable force deviations were within 3%. At the 20th iteration, the deviation of cable force for each inclined cable was within 0.5%. Compared with the forward iteration method based on the influence matrix method to determine the cable force during the construction stage, the forward difference iteration method does not require multiple extractions of complex influence matrices. Instead, it only needs to take the difference between the calculated bridge cable force and the target bridge cable force for each iteration, and then update the cable force during the construction stage for the next iteration based on the difference. This is convenient and easy to operate, and can satisfy the engineering accuracy requirements.

Publication Date

1-18-2024

DOI

10.14048/j.issn.1671-2579.2023.06.034

First Page

218

Last Page

223

Submission Date

March 2025

Reference

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