铝合金板混凝土界面的粘结滑移性能及其本构关系
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TU746.3

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湖南省自然科学基金(2018JJ3161);湖南省研究生科研创新项目(CX2018B666);湖南建工集团基础研究项目(JGJTK-2018003)


Bond-slip performance and constitutive curve of aluminum alloy sheet-concrete interface
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    摘要:

    铝合金板具有轻质高强、耐腐蚀性和延展性好等优点,是复杂恶劣环境中加固混凝土结构的理想材料。基于双剪试验进行铝合金混凝土界面粘结滑移性能研究,完成了45个构件的双面纯剪试验,得到了其破坏形态、荷载应变关系曲线、粘结界面剪应力分布曲线、荷载滑移关系曲线以及界面极限承载力,分析了不同的混凝土强度等级、铝合金板表面粗糙度、铝合金板粘结长度和粘结宽度条件下界面粘结滑移性能的演化规律。研究表明:加载过程中,界面应力从加载端向自由端逐步传递,且随着混凝土强度等级、铝合金板的粘结长度和宽度的增加,试件的剥离承载力也有所提高。但铝合金的粘结长度存在一个有效粘结长度值,超过该值试件的剥离承载力将不再增加,同时,铝合金表面粗糙度对试件剥离承载力的提高没有实质影响。通过测量铝合金板的应变得到了不同参数条件下铝合金板混凝土粘结滑移本构曲线,结果表明:铝合金板混凝土粘结滑移本构曲线存在明显的界面软化特征和非线性行为。

    Abstract:

    Aluminum alloy plate has the advantages of light weight, high strength, corrosion resistance and good extensibility. It is an ideal material for strengthening concrete structure in complex and harsh environment. In this paper, the study of bond-slip behavior of aluminum alloy-contrete interface was carried out by conducting double-sided pure shear tests on 45 members. The failure form, load-strain relationship curve, bond interface shear stress distribution curve, load-slip relationship curve and interfacial ultimate bearing capacity were obtained. The evolution of interfacial bond-slip behavior under different concrete strength grades, surface roughness of aluminum alloy plate, bond length and bond width of aluminum alloy plate were analyzed. The results show that the interfacial stress is gradually transferred from the loading end to the free end during loading. With the increase of the strength grade of concrete, and the length/width of bonding interface, the peeling capacity of the specimen is improved. But there is an effective bond length value for the aluminum alloy, beyond which the peeling bearing capacity of the specimen will not increase. Meanwhile, the surface roughness of the aluminum alloy has no substantial effect on the peeling bearing capacity of the specimen. By measuring the strain of aluminum alloy plate, the bond slip test curve of aluminum alloy plate and concrete under different parameters was obtained. The results show that the curve is of obvious interfacial softening characteristics and nonlinear behavior, which can be used to guide the actual engineering design of aluminum alloy plate reinforced concrete.

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姜德文,黄海林,刘光伟,张明亮,黄曙.铝合金板混凝土界面的粘结滑移性能及其本构关系[J].土木与环境工程学报(中英文),2020,42(3):80-89.

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  • 收稿日期:2019-09-07
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  • 在线发布日期: 2020-06-13
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