FRP Flexural Strengthened Concrete Member Design Method of Based on Early-Warning Fuses
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pISSN 1226-7988, eISSN 1976-3808 www.springer.com/12205
DOI 10.1007/s12205-020-0016-3
Structural Engineering
FRP Flexural Strengthened Concrete Member Design Method of Based on Early-Warning Fuses Rong Guo
a
, Shuo Ning
a
, Shaowei Zhao
a
, and Minghao Wang
a
a
School of Civil Engineering and Transportation, Hebei University of Technology, Tianjin 300401, China
ARTICLE HISTORY
ABSTRACT
Received 6 January 2020 Accepted 17 June 2020 Published Online 28 August 2020
The bearing capacity of members strengthened with prestressed carbon fiber reinforced plastic is improved significantly, however, the ductility of the members strengthened are reduced obviously. Moreover, no sign are observed before the failure and the failure process rapidly. The current study proposed a reinforcement method based on early-warning fuses theory to address this issue and took carbon fiber reinforced plastic as an example. First, it's necessary to determine the area of carbon fiber board and the application of prestressed in each part of the member (early-warning fuses part and load-bearing part). This needs to be determined by the basic safety reserve and the additional safety reserve of the carrying capacity, then the calculation formula are derived; Second, designing six simulation beams and four test beams. Based on the comparison of the computation of the derived formula with the simulation and test results, the calculated values of the early-warning load agree well with the simulated and experimental values, and the calculated values of the ultimate load are less than the simulated and experimental values. This showed that the theoretical calculation method has high accuracy. In addition, various evaluation index prove that the members strengthened have sufficient reserves.
KEYWORDS CFRP Reinforcement Ductility Early-warning fuses Early-warning
1. Introduction Fiber reinforced plastic (FRP) has the advantages of light weight, high strength, and corrosion resistance (Bonacci and Maalej, 2001; Mazzotti et al., 2008; Orton et al., 2009; Lou et al., 2012; Lou et al., 2014; Al-Allaf et al., 2016; Lou et al., 2017), so prestressed FRP reinforcement technology has been used more and more widely in engineering area. Some scholars studied the mechanical properties of prestressed FRP strengthened members under different working conditions in the laboratory, and the results showed that the load-bearing capacity of the members strengthened by prestressed FRP and the utilization ratio of FRP material strength are improved significantly (Triantafillou and Deskovic, 1991; Garden and Hollaway, 1998; Wight et al., 2001; Al-saidy et al., 2007; Badawi and Soudki, 2009; Ali et al., 2014; Correia et al., 2015; Cao et al., 2019). However, some literatures (Meier, 1995; Arduini et al., 1997; Buyukozturk and Hearing, 1998) showed that the ductility of FRP strengthened members will be significantly reduced, and different parameters on the members may lead to the crushing of CORRESPONDENCE Shuo Ning
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