Bond-slip constitutive model of steel bars and reactive powder concrete under standard curing

被引：0

作者：

Cheng D.-H. ^{[1
]}

Fan Y.-X. ^{[1
]}

Wang Y.-S. ^{[1
]}

机构：

[1] School of Civil Engineering, Northeast Forestry University, Harbin

来源：

| 1600年 / Editorial Board of Jilin University卷 / 51期

关键词：

Bond properties; Bond stress distribution; Constitutive mode; Reactive powder concrete;

D O I：

10.13229/j.cnki.jdxbgxb20200427

中图分类号：

学科分类号：

摘要：

In this paper, 22 groups of center pull-out tests of reactive powder concrete were carried out. The effects of concrete compressive strength, steel fiber volume content, steel bar diameter and bond length between steel bar and reactive powder concrete (RPC) on bond performance between deformed steel bar and RC RPC are analyzed. The occurrence conditions of three failure modes, such as steel bar pull-out failure, concrete splitting failure and simultaneous occurrence of steel bar pull-out and concrete splitting failure, are summarized. Combined with the test data, the calculation formula of the characteristic value of each bond anchorage under RC curing mode is obtained, and the average bond stress-slip constitutive model of RC RPC reinforcement is established., This model is verified by the test results, and the effect is good. Through the pull-out test of the center of the strain gauge attached to the steel bar, the distribution law of bond stress is analyzed, and the bond position function is obtained by fitting. The test results show that the bond strength between deformed steel bars and RPC increases with the increase of compressive strength of concrete. With the increase of steel fiber content, τu and τr tend to increase. With the increase of rebar diameter, τ0 decreases first and then increases, while τu and τr decrease. With the increase of bond length of steel bars, τ0 and τr increase, while τu decreases. With the increase of load, the peak value of bond stress moves from the loading end to the free end. The longer the bond length, the more uneven the bond stress distribution. The formula obtained by combining the average bond stress-slip constitutive model with the paste position function can fully reflect the bond stress-slip constitutive model of RC RPC and deformed steel bars. © 2021 Editorial Board of Journal of Jilin University (Engineering and Technology Edition). All right reserved.

引用

页码：1317 / 1330

页数：13

共 16 条

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