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基于性能的抗震设计要求对结构的变形能力能够进行计算,以确保不同的性能目标要求得以满足。该文研究地震荷载作用下纤维增强复合材料(FRP)加固钢筋混凝土(RC)圆柱截面曲率延性和柱顶侧向位移角计算方法。根据数值计算结果,得到了截面屈服曲率计算方法,由试验结果得到了FRP加固RC圆柱截面极限曲率计算方法。试验结果表明加固柱塑性铰长度和FRP用量密切相关,通过对29个大比例柱试验结果进行回归,得到了加固柱塑性铰长度计算方法,并分析了高FRP用量导致加固柱塑性铰长度减小的原因。经参数分析,探讨了FRP用量、轴压比与加固柱顶侧向变形能力的关系,提出了具有理想加固效率的FRP用量上限范围。
Performance-based seismic design requires that the deformation capability of the structure be calculated to ensure that different performance objectives are met. In this paper, the method of calculating the curvature ductility and lateral displacement of column top of reinforced concrete (RC) columns strengthened with FRP under seismic load is studied. According to the results of numerical calculation, the calculation method of the yield curvature of the section is obtained, and the calculation method of the ultimate curvature of the section of the RC cylinder reinforced by FRP is obtained from the experimental results. The results show that the plastic hinge length of reinforced column is closely related to the amount of FRP. By calculating the test results of 29 large-scale columns, the calculation method of the plastic hinge length of the reinforced column is obtained, and the plastic hinge length of the reinforced column is reduced s reason. Based on the parameter analysis, the relationship between the FRP dosage, the axial compression ratio and the top lateral deformation capacity of the reinforcement column was discussed. The upper limit of the FRP dosage with ideal reinforcement efficiency was proposed.