The Open Civil Engineering Journal




ISSN: 1874-1495 ― Volume 13, 2019
RESEARCH ARTICLE

Assessment of the Current State of Internal Force and the Optimization of Cable Force for an Existing Long-span Pre-Stressed Concrete (PC) Cable-stayed Bridge



Xijun Ye1, *, Zhuo Sun1, Guoqing Huang2
1 School of Civil Engineering, Guangzhou University, Guangzhou, 510006, P.R. China
2 Guangdong Province Communications Planning & Design Institute Co. Ltd, Guangzhou, 5100507, P.R. China

Abstract

Introduction:

Due to the influence of load, fatigue, corrosion, natural material aging and other long-term adverse factors, the state of the internal force of a cable-stayed bridge will be changed. These long-term effects can result in the bridge not meeting specified functional requirements, and potentially resulting in structural failure. This investigation focuses on the parameter identification of a girder for a pre-stressed concrete (PC) cable-stayed bridge. Without considering the influence of cable relaxation and temperature on the girder’s geometric shape, an improved method based on the “cable force-girder’s displacement” relationship is proposed.

Method:

In this method, measurement variations of displacement and cable force are simultaneously obtained, enabling the use of an optimization method to identify parameters which need to be resolved. To verify the proposed method, a single pylon PC cable stayed bridge (2×160m) is selected as a case study. For the state of internal force, results from the case study bridge indicate that the crack resistance value of the girder no longer satisfies the demand of Generalized codes for design of highway bridges and culverts(JTG D60-2004,in Chinese). In order to adjust the internal force, cable force optimization was undertaken, whereby bending energy was taken as the objective function.

Result:

Using these results the geometric shape of the girder was restored to its initial state. The results also show that neither the crack resistance value nor the compression resistance value of the girder exceeded specified limits, and that the stress of the girder was effectively controlled.

Keywords: PC cable-stayed bridge, Parameter identification, Cable force-girder’s displacement, Cable force, Optimization, Internal force.


Article Information


Identifiers and Pagination:

Year: 2017
Volume: 11
First Page: 572
Last Page: 585
Publisher Id: TOCIEJ-11-572
DOI: 10.2174/1874149501711010572

Article History:

Received Date: 08/02/2017
Revision Received Date: 15/06/2017
Acceptance Date: 16/06/2017
Electronic publication date: 28/07/2017
Collection year: 2017

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© 2017 Xijun et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


* Address correspondence to this author at the School of Civil Engineering, Guangzhou University, Guangzhou City, 510006, P.R. China; Tel: +86-13751772773; Fax: +86-20-39366667; E-mail: xijun_ye@gzhu.edu.cn


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