1. Guangzhou Municipal Engineering Group Co., Ltd., Guangzhou Guangdong 510060, China;
2. South China University of Technology, Guangzhou Guangdong 510640, China
Research on the Calculation Methods for the Carrying Capacity of the Cross-section of the Bending Member Reinforced with an Enlarged Section
YANG Bin1, AN Guan-feng1, SHAN Cheng-lin2
1. Guangzhou Municipal Engineering Group Co., Ltd., Guangzhou Guangdong 510060, China;
2. South China University of Technology, Guangzhou Guangdong 510640, China
摘要Regulations on relevant design specifications are comparatively analyzed to expediently calculate the carrying capacity of the cross section of the bending member of a bridge reinforced with an enlarged section. Five different failure forms of the bending member strengthened with the enlarged section are analyzed, along with the advice on modifications propounded by some experts and professors who apply the said regulations. Results lead to the conclusion that the B-class failure form of a suitable reinforced beam is impossible. This failure occurs when new tension steels do not yield but old tension steels do yield. Based on the conclusion of the present study on damage forms, the calculation formula for the carrying capacity of the cross section of bending beams strengthened with enlarged sections is obtained, and the scope of application is extended to increasing the concrete sections on the tension and compressive zones, as tested by engineering examples. The calculation method is simple and relatively safe and has already been adopted in the technical specifications for the strengthening of urban bridges, which will be enacted soon.
Abstract：Regulations on relevant design specifications are comparatively analyzed to expediently calculate the carrying capacity of the cross section of the bending member of a bridge reinforced with an enlarged section. Five different failure forms of the bending member strengthened with the enlarged section are analyzed, along with the advice on modifications propounded by some experts and professors who apply the said regulations. Results lead to the conclusion that the B-class failure form of a suitable reinforced beam is impossible. This failure occurs when new tension steels do not yield but old tension steels do yield. Based on the conclusion of the present study on damage forms, the calculation formula for the carrying capacity of the cross section of bending beams strengthened with enlarged sections is obtained, and the scope of application is extended to increasing the concrete sections on the tension and compressive zones, as tested by engineering examples. The calculation method is simple and relatively safe and has already been adopted in the technical specifications for the strengthening of urban bridges, which will be enacted soon.
通讯作者:
YANG Bin, E-mail:yangbin2345@126.com
E-mail: yangbin2345@126.com
引用本文:
杨斌, 安关峰, 单成林. 增大截面加固受弯构件的正截面承载力计算方法[J]. Journal of Highway and Transportation Research and Development, 2015, 9(4): 41-49.
YANG Bin, AN Guan-feng, SHAN Cheng-lin. Research on the Calculation Methods for the Carrying Capacity of the Cross-section of the Bending Member Reinforced with an Enlarged Section. Journal of Highway and Transportation Research and Development, 2015, 9(4): 41-49.
[1] GB 50367-2013, Code for Design of Strengthening Concrete Structure[S]. (in Chinese)
[2] JTG/T J22-2008, Specifications for Strengthening Design of Highway Bridges[S]. (in Chinese)
[3] CHEN Huan-yong, SHAN Cheng-lin, LIANG Li-nong, et al. Research about the Design Principle of Flexural Member Strengthened with Reinforced Concrete for Existing Codes[J]. Earthquake Resistant Engineering and Retrofitting, 2010,32(2):87-90, 111. (in Chinese)
[4] WU Xiao-guang, BAI Qing-xia, LEI Zi-xue. The Calculation Example for Specifications for Strengthening Design of Highway Bridges[M]. Beijing:China Communications Press, 2011. (in Chinese)
[5] YE Jian-shu. Structure Design Principle[M]. Beijing:China Communications Press, 2007. (in Chinese)
[6] GUO Zhen-hai,SHI Xu-dong. Principle and Analyze of Reinforced Concrete[M]. Beijing:Tsinghua University Press, 2007. (in Chinese)
[7] GB 50010-2010, Code for Design of Concrete Structures[S]. (in Chinese)
[8] JTG D62-2004, Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts[S]. (in Chinese)
[9] LIU Si-meng. Research on Bearing Capacity and Failure Modes of RC Beam after Strengthening by Section Enlargement under Twi-Loading Condition[C]//Proceedings of the 20th National Structural Engineering Conference (Ⅱ). Beijing:Engineering Mechanics Press, 2011:449-453. (in Chinese)
[10] YUAN Guang-lin, XU Yuan-yuan. Experimental Research on the Beams Strengthened by Section Enlargement under Secondary Loading Condition[J]. Journal of Shandong University of Science and Technology:Natural Science Edition, 2007, 26(5):40-45. (in Chinese)
[1]
常柱刚, 王林凯, 夏飞龙. 基于CV NewMark-b法桥梁风致振动FSI数值模拟[J]. Journal of Highway and Transportation Research and Development, 2019, 13(2): 28-37.
2015, Vol. 9 
