【摘要】 为研究钢筋钢纤维混凝土梁柱节点抗震性能数值模拟方法,基于OpenSEES有限元平台中的梁柱节点单元(beam-column joint element, BCJE)模型,通过修正模型中剪切块和钢筋滑移弹簧的参数修正方法,提出适用于钢筋钢纤维混凝土梁柱节点的数值模型,并基于6个梁柱节点的拟静力试验结果进行模型验证分析,数值模拟结果与试验结果吻合较好,提出的数值模型能够较精确地反映节点滞回行为。在此基础上,分析了轴压比、钢纤维体积率和配箍量对梁柱节点抗震性能的影响规律,建立了节点受剪承载力的计算公式。结果表明:掺入钢纤维和增加配箍可明显改善梁柱节点的抗震性能,钢纤维体积率从0.5%增加到2.0%,极限荷载提高了18%;箍筋从1Φ8增加到3Φ8时,极限荷载提高了19.7%。更多还原

【Abstract】 Based on the OpenSEES standard solver, a numerical simulation method was presented for investigating the seismic behavior of steel fiber reinforced concrete beam column joints through modifying the calculation method of shear deformation in the core area of joints and bond slip deformation of the longitudinal reinforcement of the beam. And then, a set of experimental data was collected to verify the accuracy of the numerical modeling approach, in terms of the hysteresis curves and skeleton curves. It is found that the numerical simulation can accurately reflect the evolution process of beam-column joints, and the predicted curves agree well with the experimental results. Furthermore, the influences of some key parameters on the seismic performance of beam-column joints were investigated and discussed in detail, and a design formula for calculating the ultimate shear capacity was also presented. The parametric analysis clearly indicates that both adding the steel fiber and increasing the stirrups ratio can significantly improve the seismic behavior of beam-column joints. With the increase of the volume ratio of steel fiber, the ultimate load is improved by 18%. Besides, the ultimate load is improved by 19.7%, with the increase of stirrup diameter.更多还原