Bond-slip Constitutive Model of BFRPC and Prestressed Steel Strand

被引：0
|
作者：
Gong Y.-F. [1 ]
Song J.-X. [1 ]
Wu S.-Z. [1 ]
Zhang Y.-W. [1 ]
Ma G.-R. [1 ]
机构：
[1] College of Transportation, Jilin University, Jilin, Changchun
来源：
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2023年 / 36卷 / 09期
关键词：
basalt fiber reactive powder concrete; bond-slip constitutive model; bridge engineering; central pull-out test; steel strand;
D O I：
10.19721/j.cnki.1001-7372.2023.09.008
中图分类号：
学科分类号：
摘要：
The bonding performance between prestressed strands and basalt fiber-reactive powder concrete (BFRPC) significantly affects the performance of prestressed BFRPC bridge structures in terms of flexural load capacity, crack control, and stiffness. Consequently, to clarify the bond-slip failure process between the prestressing strands and BFRPC, the effects of the strand diameter and bond length on the bonding performance between the prestressing steel strands and BFRPC were investigated using a central pull-out test. The bond stress-slip curve characteristics, bond strength, and influencing factors are discussed intensively. A segmented bilinear bond stress-slip constitutive model for the BFRPC and prestressing steel strands was established. The ultimate bond strength calculation model of the prestressed steel strand and BFRPC was modified by comprehensively considering the spiral winding characteristics of the steel strand and the rotational slip failure mode. The results show that for prestressing steel strands with the same diameter, the initial bond stress decreases by 15% to 18%, and the ultimate bond stress decreases by 20% to 23% per 100 mm increase in bond length. The Poisson effect weakens the grip between the concrete and the strand, so the bond strength is inversely proportional to the strand diameter. The bond-slip constitutive model of the steel strand and BFRPC can effectively distinguish the linear and slip segments of the pull-out damage. The accuracy of the established ultimate bond strength correction model is excellent, and the error is controlled within ±8% on both sides of the theoretical calculation control line. © 2023 Xi'an Highway University. All rights reserved.
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页码：96 / 105
页数：9
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