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在对锈蚀钢筋混凝土框架柱进行低周往复荷载试验和滞回性能数值模拟研究的基础上,通过理论分析和数据拟合建立了能较好地反映锈蚀钢筋混凝土框架柱滞回性能的退化三线形恢复力模型。该模型主要包含屈服剪力Py、屈服位移Δy、峰值剪力Pu、峰值位移Δu、破坏剪力Pcu和破坏位移Δcu6个关键参数。在确定模型骨架线上的承载力和位移特征点参数时考虑了钢筋锈蚀率、轴压比等因素的影响。根据拟合恢复力模型计算得到的骨架曲线与试验结果较为接近,最大误差在10%以内。
Based on the low-cycle cyclic loading test and the numerical simulation of hysteretic behavior of corroded reinforced concrete frame columns, a degenerate tri-linear that can well reflect the hysteretic behavior of corroded RC frame columns is established by theoretical analysis and data fitting. Resilience model. The model mainly includes six key parameters, yield stress Py, yield displacement Δy, peak shear force Pu, peak displacement Δu, failure shear force Pcu and failure displacement Δcu. The factors such as the corrosion rate of steel bar, axial compression ratio and other factors were taken into account in determining the bearing capacity and displacement characteristic parameters of the model skeleton line. The skeleton curve calculated from the fitting resilience model is close to the experimental one with the maximum error within 10%.