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Effect of Staggering Distances on Splice Strength of New- Generation Glass Fiber-Reinforced Polymer Reinforcing Bars
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Effect of Staggering Distances on Splice Strength of New- Generation Glass Fiber-Reinforced Polymer Reinforcing Bars
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Effect of Staggering Distances on Splice Strength of New- Generation Glass Fiber-Reinforced Polymer Reinforcing Bars
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Journal Article
Effect of Staggering Distances on Splice Strength of New- Generation Glass Fiber-Reinforced Polymer Reinforcing Bars
2025
Overview
This study addressed a critical knowledge gap by examining the influence of staggering on the bond strength of lapped glass fiber-reinforced polymer (GFRP) bars in concrete members. It involved a comprehensive investigation of new-generation GFRP bars with varying staggering configurations in nine large-scale GFRP-reinforced concrete (RC) beams with a rectangular cross section of 300 x 450 mm (11.8 x 17.7 in.) and a length of 5200 mm (204.7 in.). The tests investigated splice strength with three staggering distances: 0, 1.0, and 1.3 times the splice length ([l.sub.s]) from center-to-center of two adjacent splices, and three splice lengths of 28, 38, and 45 times the bar diameter ([d.sub.b]). Results revealed a slight improvement in ultimate load-carrying capacity (less than 10%) for partially and fully staggered splices compared to non-staggered ones, with the latter exhibiting a more ductile failure mode. The effect of staggering was consistent across different splice lengths, demonstrating that splice length was not a factor. Although staggering reduced flexural crack width, it increased the total number of cracks due to expanded splice regions. Bond strength improved with staggering, with gains of 4.0% and 8.0% for partially and fully staggered splices, respectively. ACI CODE-440.11-22 provides more accurate predictions of the bond strength of lap-spliced GFRP bars than the other design codes, showing an average test-to-prediction ratio of 1.03 for non-staggered splices. Nevertheless, it requires some reconsiderations when it comes to staggered splices. To address this, a proposed modification factor was introduced to account for staggering conditions when calculating bond strength and splice length in ACI CODE-440.11-22. Keywords: bond strength; concrete structures; design codes; development length; glass fiber-reinforced polymer (GFRP) reinforcing bars; lap splicing; splice length; splice strength; staggering effect.
Publisher
American Concrete Institute
Subject
