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为研究反复荷载下型钢再生混凝土组合柱粘结性能,对17个组合柱进行了拟静力试验。重点分析型钢翼缘应变分布特征,利用粘结应力计算公式获取型钢翼缘粘结应力大小及其分布规律。在此基础上,分析组合柱粘结破坏机理和位移荷载循环次数对其粘结应力的影响规律,并给出粘结应力退化率计算公式。研究结果表明:反复荷载作用下型钢再生混凝土组合柱粘结应力分布规律基本呈抛物线状;柱中部附近的粘结应力最大,柱上下端粘结应力分布复杂,需对这三个部位采取相应的措施以保证型钢与再生混凝土之间的粘结强度;位移循环荷载作用下粘结强度逐渐降低,出现粘结应力退化现象。研究结论可为型钢再生混凝土组合柱的抗震设计提供理论参考。
In order to study the bonding properties of steel reinforced concrete composite columns subjected to repeated loads, pseudo-static tests were performed on 17 composite columns. The stress distribution characteristics of profiled steel flanges are analyzed in detail, and the bond stress and the distribution law of profiled steel flanges are obtained by using the bond stress calculation formula. On this basis, the effects of the bond failure mechanism and the number of displacement load cycles on the bond stress of the composite column were analyzed, and the calculation formula of the bond stress degradation rate was given. The results show that the bond stress distribution rule of steel reinforced concrete composite columns under parabolic loading is basically parabolic; the maximum bond stress near the middle of the column and the distribution of the bond stress at the upper and lower ends of the column are complex, and the three parts need to be correspondingly Measure to ensure the bond strength between steel and recycled concrete; the displacement bond strength decreases gradually under the action of cyclic loading, and the phenomenon of bond stress degradation occurs. The research conclusions can provide a theoretical reference for seismic design of steel reinforced concrete composite columns.