| 铝合金筋加固混凝土梁界面黏结性能与剥离承载力研究 |
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| 引用本文： | 邢国华,罗小宝,马 军,常召群,党会学. 铝合金筋加固混凝土梁界面黏结性能与剥离承载力研究[J]. 建筑科学与工程学报, 2021, 0(1): 41-50. DOI: 10.19815/j.jace.2020.08053 |
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| 作者姓名： | 邢国华 罗小宝 马 军 常召群 党会学 |
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| 作者单位： | (长安大学 建筑工程学院,陕西 西安 710061) |
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| 摘 要： | 通过试验研究与有限元模拟计算,分析了铝合金筋嵌入式加固混凝土梁的破坏模式和承载能力,对比了不同的剥离承载力计算模型,获得了铝合金筋应力和应变以及界面黏结应力沿梁跨度方向的分布曲线,推导出界面黏结-滑移关系和剥离承载力计算公式.结果 表明:铝合金筋加固混凝土梁界面剥离破坏模式分为界面剥离破坏和混凝土保护层剥离破坏,混凝土...
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| 关 键 词： | 混凝土梁 嵌入式加固 铝合金 有限元 黏结-滑移关系 剥离承载力 |
Study on Bonding Performance and Debonding Capacity of RC Beam Strengthened with NSM Aluminum Alloy Bars |
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| XING Guo-hua,LUO Xiao-bao,MA Jun,CHANG Zhao-qun,DANG Hui-xue. Study on Bonding Performance and Debonding Capacity of RC Beam Strengthened with NSM Aluminum Alloy Bars[J]. Journal of Architecture and Civil Engineering, 2021, 0(1): 41-50. DOI: 10.19815/j.jace.2020.08053 |
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| Authors: | XING Guo-hua LUO Xiao-bao MA Jun CHANG Zhao-qun DANG Hui-xue |
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| Affiliation: | (School of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China) |
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| Abstract: | Through experimental research and finite element analysis, the failure mode and bearing capacity of concrete beams strengthened with near surface mounted(NSM)aluminum alloy(AA)bars were analyzed, different debonding capacity calculation models were compared, the distribution curves of stress and strain of the AA bars and interface bond stress along the beam span direction were obtained, and the interface bond stress-slip relationship and the calculation formula of debonding capacity were derived. The results show that there are two modes of interface debonding failure of concrete beams strengthened with AA bars, namely, the intermediate crack debonding and concrete cover separation. The flexural performance and deformation performance of concrete beams are improved after the beams being strengthened. The intermediate crack-induced debonding between NSM bars and concrete is induced by the extension of bending cracks in the constant moment region. The concrete cover separation occurs because of the extension of several cracks induced by the stress concentration at the end of the NSM bars. Along the direction from mid-span to beam end, the stress and strain of the AA bars gradually decrease, the interface bonding stress firstly increases and then decreases, and the maximum stress increases with the increase of the load. The debonding process of RC beam strengthened with NSM AA bars can be divided into four stages, namely, elastic stage, elastic softening stage, elastic softening debonding stage and softening debonding stage. The proposed calculation model can accurately predict the debonding capacity of concrete beams strengthened with AA bars. |
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| Keywords: | concrete beam NSM aluminum alloy finite element bond stress-slip relationship debonding capacity |
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