Strain driven mode-switching analytical framework for estimating flexural strength of RC box girders strengthened by prestressed CFRP plates with experimental validation

被引:2
作者
Deng, Yu [1 ]
Ling, Daoyuan [1 ]
Guo, Zhen [1 ]
Sukontasukkul, Piti [2 ]
Yuen, Terry Y. P. [3 ]
Wong, Simon H. F. [4 ]
Adom-Asamoah, Mark [5 ]
Limkatanyu, Suchart [6 ]
Hansapinyo, Chayanon [7 ]
Osei, Jack Banahene [5 ]
Owusu-Twumasi, Jones [5 ]
Kuang, J. S. [8 ]
Zhang, Hexin [9 ]
机构
[1] Guangxi Univ Sci & Technol, Sch Civil Engn & Architecture, Liuzhou 545006, Peoples R China
[2] King Mongkuts Univ Technol North Bangkok, Construct & Bldg Mat Res Ctr, Dept Civil Engn, Bangkok 10800, Thailand
[3] Natl Yang Ming Chiao Tung Univ, Dept Civil Engn, Hsinchu, Taiwan
[4] Technol Higher Educ Inst Hong Kong, Dept Construct Technol & Engn, Tsing Yi Isl, 20A Tsing Yi Rd, Hong Kong, Peoples R China
[5] Kwame Nkrumah Univ Sci & Technol, Dept Civil Engn, Kumasi, Ghana
[6] Prince Songkla Univ, Fac Engn, Dept Civil & Environm Engn, Hat Yai 90112, Thailand
[7] Chiang Mai Univ, Excellence Ctr Infrastructure Technol & Transporta, Dept Civil Engn, Chiang Mai 50200, Thailand
[8] Hong Kong Univ Sci & Technol, Dept Civil & Environm Engn, Kowloon, Hong Kong, Peoples R China
[9] Edinburgh Napier Univ, Sch Comp Engn & Built Environm, 10 Colinton Rd, Edinburgh EH10 5DT, Scotland
关键词
RC box girder; prestressed CFRP plate; Strengthening; Shear lag effect; Analytical model; BEAMS; BEHAVIOR;
D O I
10.1016/j.engstruct.2023.116084
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
This paper presents a pioneering study that developed the first analytical model to analyse and design reinforced concrete (RC) box girders strengthened by prestressed CFRP plates. The proposed analytical model considered and addressed prestress loss, shear lag effect and failure modes under different design configurations at elastic, elastoplastic and plastic stages. An experimental study was also conducted to validate the proposed analytical model. The study was motivated by the increasing demand for the structural strengthening of aged and over-used hollow RC box girders in transport and other infrastructure systems, as well as the lack of previous attempts to incorporate prestressed CFRP plate strengthening for hollow RC beams. It is very common in many developing countries, the traffic flow increased dramatically due to the economic growth. The original design under-estimated the traffic loads. When demolition and re-building may not always be the best option, thus, strengthening and enhanced maintenance have become promising alternatives. But the lack of existing analytical models that can guide the engineers to analyse and design this type of structures effective, has become an urgent need from the industry. In the experimental study, eight box girders with different types, cross-section sizes, and prestress levels were prepared and tested. Two samples were preloaded to create damaged beams before strengthening to simulate the aged or over-used members. The experimental results are in good agreement with the analytical prediction. The proposed analytical framework provides a comprehensive yet practical method for designing the prestressed CFRP strengthened RC box girders in bending and laid the foundation for further studies on shear and torsion behaviours.
引用
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页数:16
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