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为研究型钢与再生混凝土界面之间的黏结滑移性能,以再生粗骨料取代率、型钢与再生混凝土的黏结部位、型钢保护层厚度、横向配箍率、再生骨料母料强度和再生骨料粒径等为变化参数,设计了22个型钢再生混凝土试件,采用位移控制的加载方法进行推出试验。通过观察试件的受力破坏过程,分析型钢与再生混凝土界面黏结失效机理,获取其裂缝发展形态、应力分布情况、加载端和自由端滑移分布规律;分析不同参数对型钢再生混凝土黏结滑移性能的影响规律。研究结果表明:型钢不同黏结部位与混凝土的黏结应力不同,翼缘内侧黏结应力最高,翼缘外侧次之,腹板黏结应力最小;黏结应力沿型钢埋置长度方向呈指数分布;再生骨料的母料混凝土使用时间越长,用其生产的骨料配置的同条件的混凝土强度越低;再生混凝土骨料粒径越小,再生混凝土与型钢的极限黏结强度越小。
In order to study the bond slippage between the section steel and recycled concrete, the ratio of recycled coarse aggregate, the bonding area between steel and recycled concrete, the thickness of steel section, the transverse stirrup ratio, the strength of recycled aggregate masterbatch, Material particle size and other parameters for the change, designed 22 sections steel recycled concrete specimens, the use of displacement control loading method for launch test. By observing the process of specimen failure, the failure mechanism of interface between steel and recycled concrete was analyzed, and the development pattern of fractures, stress distribution and slip distribution at the free end and the free end were obtained. The influence of different parameters on the bond and slip of recycled concrete The law of performance. The results show that the bond stress between the different sections of the section steel and the concrete is different, the internal bond stress of the flange is the highest, the outer edge of the flange is the second, and the web bond stress is the smallest. The bond stress distributes exponentially along the length of the steel section. The longer the concrete used for the masterbatch, the lower the concrete strength is. The smaller the aggregate size of the recycled concrete, the smaller the ultimate bond strength between the recycled concrete and the section steel.