Study on the interfacial bond slip constitutive relation of I-section steel and fully recycled aggregate concrete
Study on the interfacial bond slip constitutive relation of I-section steel and fully recycled aggregate concrete
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工字钢与全再生骨料混凝土界面粘结滑移本构关系研究
DOI：
10.1016/j.conbuildmat.2019.117688
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发表时间：
2020-03-30
影响因子：
7.4
通讯作者：
Chen, Xiaona
中科院分区：
文献类型：
--
作者：
Bai, Guoliang;Ma, Jinfeng;Chen, Xiaona
为研究粗骨料置换率为100%的工字型钢与钢筋再生混凝土的界面粘结滑移行为，设计了17个标准推拔试件。试验参数为再生骨料混凝土强度、工字钢保护层厚度、工字钢埋设长度和配箍比。试验结果表明，工字截面钢在SRRC界面处的应变和应力呈指数分布，4个试验参数对SRRC界面结合强度有一定影响。在对试验数据进行分析的基础上，建立了SRRC界面结合强度的计算公式。建立了加载端粘结滑移的本构关系，多级线性计算结果比幂型计算结果更符合试验结果。最后，引入了粘结滑移的位置函数F (x)和粘结应力G(x)，建立了粘结滑移随位置变化的本构关系，为相关规范设计和工程施工提供参考。(C) 2019 Elsevier Ltd.版权所有。
17 standard push-out specimens which are designed to study the interfacial bond-slip behavior of I-section steel and reinforced recycled concrete with 100% replacement ratio of coarse aggregate (SRRC). The parameters of test are strength of recycled aggregate concrete, thickness of I-section steel protective layer, embedded length of I-section steel and ratio of stirrups. The test results show that the strain and stress of the I-section steel at the interface of SRRC distribute exponentially, and the four test parameters have a certain influence on the interfacial bond strength of SRRC. Based on the analysis of the test data, the calculation formulas of the interfacial bond strength of SRRC are established. The constitutive relations of the bond-slip at the loading end are established, and the multistage linear results are more satisfied with the test results than power-type. Finally, the position function of the bond-slip F (x) and the bond stress G(x) are introduced, and the bond-slip constitutive relation with changes of position are established, which provides a reference for related specification design and engineering construction. (C) 2019 Elsevier Ltd. All rights reserved.