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等效塑性铰长度是确定压弯钢筋混凝土柱塑性转动能力和极限位移能力的重要指标.为准确计算等效塑性铰长度,首先通过截面分析推导得出塑性铰长度的影响参数,根据计算分析结果,建立考虑弯曲作用的等效塑性铰长度计算公式;收集PEER数据库30个弯曲破坏柱极限水平位移数据,在此基础上进一步提出考虑纵筋滑移影响的等效塑性铰长度计算公式;最后,采用所提公式与现有其他等效塑性铰长度计算公式,计算得出柱极限水平位移,并与试验数据进行对比.研究结果表明:压弯钢筋混凝土柱塑性铰长度主要与轴压比n、受拉纵筋配筋率ρ有关,随着n的增大和ρ的减小,塑性铰长度不断减小;所提公式与试验数据吻合良好,可以用于压弯钢筋混凝土柱抗震设计分析.
The equivalent plastic hinge length is an important index to determine the plastic rotation capacity and the ultimate displacement capacity of the RC column. To accurately calculate the equivalent plastic hinge length, the influence parameters of the plastic hinge length are deduced first through the section analysis. According to the calculation and analysis results , The equivalent plastic hinge length calculation formula considering the bending effect is established. The ultimate horizontal displacement data of 30 bending failure columns in the PEER database are collected. On the basis of this calculation, the equivalent plastic hinge length calculation formula considering the influence of longitudinal reinforcement is proposed. Finally, The formula of the equivalent plastic hinge length is used to calculate the horizontal displacement of the column, and compared with the experimental data.The results show that the length of the plastic hinge of the CFRP column is mainly related to the axial compression ratio n, The length of plastic hinge decreases with the increase of n and the decrease of ρ. The proposed formula is in good agreement with the experimental data and can be used to analyze the aseismic design of the RC columns.