Calculation Method for Optimal Prestressing of Reinforced Concrete Beams Strengthened with Prestressed TRM

被引：0

作者：

Ren W. ^{[1
]}

Huang P.-M. ^{[1
]}

Li X.-L. ^{[2
]}

Zhao Y. ^{[1
]}

Liu H. ^{[3
]}

机构：

[1] Key Laboratory of Transport Industry of Bridge Detection Reinforcement Technology, Chang'an University, Shaanxi, Xi'an

[2] Guangdong Provincial Transport Planning and Research Center, Guangdong, Guangzhou

[3] Jining Hongxiang Highway Survey and Design Institute Co. Ltd., Shandong, Jining

来源：

Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2022年 / 35卷 / 09期

关键词：

bridge engineering; calculation method; model test; optimal failure criterion; optimal prestress; prestressed TRM;

D O I：

10.19721/j.cnki.1001-7372.2022.09.024

中图分类号：

学科分类号：

摘要：

To broaden the application range of textile-reinforced mortars (TRMs) in reinforced concrete (RC) beams, the mechanism of RC beams strengthened with prestressed TRMs was examined, the reasonable value range of fiber prestress was explored, and the calculation accuracy in reinforcement design was improved in this study. Based on an interactive verification of the model test and nonlinear damage numerical test of RC beams strengthened with prestressed TRMs, the mechanisms of the original structure and the reinforced structure during the entire bearing process were compared. Based on an investigation of the influence of parameters, an analysis model was established and a calculation method was proposed. The following conclusions were drawn: prestressed TRMs can effectively improve the stress state of the reinforced beam section and the utilization rate of fiber material strength. With increasing fiber prestress, the bearing capacity of the reinforced beam can reach an extreme point, corresponding to the optimal prestress. The optimal prestress ratio is not constant, it increases with increasing fiber reinforcement and decreases with increasing concrete strength, and the effect of an initial load can be ignored. The optimal failure mode is that the strength of the three materials are utilized, that is, the tensile reinforcement yield, concrete crushing in a compression zone, and TRM fracture. The calculation method and simplified calculation formula for the normal section bearing capacity of RC beams strengthened by prestressed TRMs are determined after parameter optimization, and the accuracy is verified, demonstrating that the model can be directly applied for design and calculation. This paper presents the optimal prestress of RC beams strengthened with prestressed TRMs, and the proposed calculation and analysis methods, which can be directly utilized for the design of RC beams strengthened with prestressed TRMs. © 2022 Xi'an Highway University. All rights reserved.

引用

页码：311 / 320

页数：9

共 24 条

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