Abstract
Currently, the down-warping flexure of the main girders is a common and serious bridge disease, and the commonly adopted reinforcement scheme is to first conduct jacking and then employ prestressed reinforcement and other measures. At present, the stiffness of the main girder during the jacking is usually a constant, with relatively little research on utilizing variable stiffness to simulate the jacking process of the main girders. However, objectively speaking, the actual stiffness of the main girders during the jacking varies, and the stiffness of the main girders gradually increases with the continuously closing cracks. For prestressed concrete girders, when compressive stress occurs at the lower edge of the main girder, or when the crack is completely closed, it can be approximated that the stiffness has basically restored to the stiffness value before down-warping flexure. Based on Branson's effective moment of inertia calculation formula, this paper employed Midas/Civil finite element software to propose a simple method for simulating the stiffness changes during the jacking of concrete girders. Based on the Shangri-La Bridge treatment project in Daocheng County, Sichuan Province, comparative analysis of calculated values and measured data was conducted to show that this method is simple, effective, and applicable.
Publication Date
11-8-2022
DOI
10.14048/j.issn.1671-2579.2022.05.016
First Page
88
Last Page
91
Submission Date
April 2025
Recommended Citation
Haijun, Wu; Haitao, Tang; Tao, Chen; and Chunyan, Luo
(2022)
"Study on Simulation Method of Stiffness of Prestressed Concrete Girder with Down-Warping Flexural Cracking during Jacking Process,"
Journal of China & Foreign Highway: Vol. 42:
Iss.
5, Article 16.
DOI: 10.14048/j.issn.1671-2579.2022.05.016
Available at:
https://zwgl1980.csust.edu.cn/journal/vol42/iss5/16
Reference
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