A Simplified Model for Crack Width Prediction of Flexural-Strengthened High Pre-Damaged Beams with CFRP Sheet
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pISSN 1226-7988, eISSN 1976-3808 www.springer.com/12205
DOI 10.1007/s12205-020-2316-z
Structural Engineering
A Simplified Model for Crack Width Prediction of Flexural-Strengthened High Pre-Damaged Beams with CFRP Sheet Feng Yu
a
, Yuan Fang
a
, Hao Zhoua, Rui Bai
b
, and Changfeng Xiea
a
Dept. of Civil Engineering and Architecture, Anhui University of Technology, Maanshan 243032, China Dept. of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong 999077, China
b
ARTICLE HISTORY
ABSTRACT
Received 17 December 2019 Revised 1st 4 February 2020 Revised 2nd 21 April 2020 Accepted 23 July 2020 Published Online 2 October 2020
Fibre reinforced polymer (FRP) is extensively applied in the field of maintenance and reinforcement. In the actual reinforcement of concrete structures, most reinforced concrete (RC) members are in a cracked state and the existing calculation methods seldom consider the initial damage of concrete, especially the effect of severe damage on the crack of RC members. Therefore, it is necessary to propose a model for accurately evaluating the crack width of the repaired different damage state concrete members with carbon fiber reinforced plastic (CFRP) sheet. This study presents an experimental investigation on the crack behaviors of the CFRP sheet flexural-strengthened pre-damaged RC beams based on the results of an experimental program involving ten specimens. The influence of the pre-damaged level, reinforcement ratio and CFRP sheet strengthening layer on the crack development, failure characteristics, crack spacing and crack width is analyzed and discussed. Taking into account the influence of the CFRP sheet strengthening layer and pre-damaged level, a formula for predicting the average crack spacing is proposed, and then an analytical model for the crack width prediction of the flexural-strengthened high pre-damaged beams is established based on the calculation model of the crack width of the ordinary RC beams. The predicted results agree well with test values including data of this study and experimental data of 64 sets of references.
KEYWORDS Fibre reinforced polymer Beams Reinforcement Crack Reinforcement ratio Pre-damaged level
1. Introduction In recent decades, fibre reinforced polymer (FRP) has been extensively applied in civil applications, especially in the field of maintenance and reinforcement (Teng et al., 2009; Kalfat et al., 2013; Pankaj et al., 2014; Gao et al., 2018; Mugahed et al., 2018; Cao et al., 2019; Siddika et al., 2019; Zhang et al., 2019). A large number of analytical and experimental investigations on the RC members reinforced with FRP strips or sheets have been carried out to investigate their mechanical behaviors and fruitful achievements have been made (Newhook et al., 2002; Li et al., 2006; Attari et al., 2012; Sayed et al., 2014; Giuseppe et al., 2015; Yu et al., 2018; Yu et al., 2020), some of which have been adopted by several national standards (Japan Society of Civil Engineering (JSCE), 1997; FIB TG9
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