Deflection analysis of pre-stressed concrete beam with local corrosion

IF 4.3 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2025-10-17 DOI:10.1016/j.istruc.2025.110457

Huang Tang , Jianxin Peng , Hui Peng , Yiming Yang , Hai Li , Yaping Ge , Junyi Xiao , Shuhao Yao

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引用次数: 0

Abstract

In order to investigate the influence of local corrosion on the deflection of pre-stress concrete beam, the advanced curvature integral method and the step stiffness method are introduced in this paper, the calculation results are compared with the tested results and the measuring results of practical bridge. At last, the influence of parameters such as the corrosion rate, length of corrosion area, corrosion location and reinforcement ratio on the deflection of local corroded PC beam are analyzed. The results show that the advanced curvature integral method can predict the deflection of corroded tested PC beams and the real main beam of bridge, and which is more accurately than step stiffness method, but the calculated time of step stiffness method is significantly reduced and meeting the needs of engineering inspection for calculating the deflection of real bridge. When the corrosion rate reaches 15 %, the corrosion rate is the main parameter affecting the flexural stiffness of PC beam. For the local corrosion length from 0.5 m to 2 m, the deflection of PC beam with different corrosion length is relatively close. For bridges where the corrosion length is less than 50 % of beam length, the calculation results will be too conservative if the effect of corrosion length is omitted. When the reinforcement rate exceeds 3.5 %, the reduction of deflection is decreased. The local corrosion has a more significant effect on PC beam with lower reinforcement rates.

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局部腐蚀预应力混凝土梁的挠度分析

为了研究局部腐蚀对预应力混凝土梁挠度的影响，本文介绍了超前曲率积分法和阶跃刚度法，并将计算结果与试验结果和实际桥梁实测结果进行了比较。最后，分析了腐蚀速率、腐蚀区域长度、腐蚀位置和配筋率等参数对局部腐蚀PC梁挠度的影响。结果表明：超前曲率积分法能够预测锈蚀试验PC梁和桥梁实际主梁的挠度，且比阶跃刚度法更准确，但阶跃刚度法的计算时间显著缩短，满足工程检验对实际桥梁挠度计算的需要。当腐蚀速率达到15 %时，腐蚀速率是影响PC梁抗弯刚度的主要参数。在局部腐蚀长度为0.5 m ~ 2 m范围内，不同腐蚀长度的PC梁挠度比较接近。对于腐蚀长度小于梁长50% %的桥梁，如果忽略腐蚀长度的影响，计算结果将过于保守。当配筋率超过3.5 %时，减挠度减小。局部腐蚀对配筋率越低的PC梁影响越显著。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Structures Engineering-Architecture

CiteScore

5.70

自引率

17.10%

发文量

1187

期刊介绍： Structures aims to publish internationally-leading research across the full breadth of structural engineering. Papers for Structures are particularly welcome in which high-quality research will benefit from wide readership of academics and practitioners such that not only high citation rates but also tangible industrial-related pathways to impact are achieved.