Crack Width Formulas for Flexural Concrete Members Reinforced with Fiber-Reinforced Polymer Bars

doi:10.11908/j.issn.0253-374x.22013

Home > Archive>Volume 51, Issue 7, 2023 >1065-1072. DOI:10.11908/j.issn.0253-374x.22013

Crack Width Formulas for Flexural Concrete Members Reinforced with Fiber-Reinforced Polymer Bars
DOI:
                        10.11908/j.issn.0253-374x.22013
                    
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Author:
                        PENG Fei1,2PENG Fei
Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education， Hunan University， Changsha 410082， China;College of Civil Engineering， Hunan University， Changsha 410082， China
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XUE Weichen3XUE Weichen
College of Civil Engineering， Tongji University， Shanghai 200092， China
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Affiliation:1.Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education， Hunan University， Changsha 410082， China;2.College of Civil Engineering， Hunan University， Changsha 410082， China;3.College of Civil Engineering， Tongji University， Shanghai 200092， China
Clc Number:TU377.94
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Abstract:

To evaluate and calibrate the maximum crack width formulas for flexural concrete members reinforced with fiber-reinforced polymer （FRP） bars in current design standards， available literature on crack width tests of FRP reinforced concrete （RC） flexural members was extensively surveyed. After applying multiple filtering criteria， a database including 111 FRP-RC flexural members was developed. Then， the database was used to evaluate the accuracy of the crack width provisions from three design guidelines by comparing the tested widths with predictions. It was determined that GB 50608—2010 highly underestimated the maximum crack width， especially for the GFRP-RC and BFRP-RC members. In contrast， CJJ/T 280—2018 was more predictive than the other guidelines， while ACI 440.1R-15 provided conservative predictions. Based on this database， modifications were made to the non-uniform strain coefficient formula for tensile FRP bars in GB 50608—2010 by introducing an elastic modulus ratio E_f/E_s. Furthermore， the bond-dependent coefficients in the three design guidelines were calibrated to account for the effect of surface treatment.

Key words:fiber-reinforced polymer (FRP) bar;flexural concrete member;crack width;experimental database;calibration

Reference

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PENG Fei, XUE Weichen. Crack Width Formulas for Flexural Concrete Members Reinforced with Fiber-Reinforced Polymer Bars[J].同济大学学报(自然科学版),2023,51(7):1065~1072

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Received:January 10,2022
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Online: July 25,2023
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