钢筋混凝土梁抗震可靠度影响因素

目的研究钢筋混凝土梁抗震可靠度的影响因素，分析各因素对钢筋混凝土梁抗震可靠度计算的影响规律，为钢筋混凝土梁设计和加固提供参考．方法采用考虑变量随机分布的JC验算点法，对钢筋混凝土梁的抗弯和抗剪可靠度进行计算，统计可靠度随各因素的变化规律．结果梁抗弯可靠度随配筋率和应变速率的增大而增大，随荷载比的增大而减小．梁抗剪可靠度随应变率和剪力增大系数的增加而增加，随配箍率和荷载比的增大而减小．钢筋混凝土梁抗弯可靠度和抗剪可靠度随几何尺寸（宽、高、保护层厚度，箍筋间距）的变化有微小变化或无变化．结论梁抗弯可靠度受配筋率、荷载比以及应变速率的影响较大，受几何尺寸的影响很小；梁抗剪可靠度受配箍率、荷载比、应变速率及剪力增大系数取值的影响较大，不受几何尺寸的影响．

The Analysis of Influencing Factors in the Aseismic Reliability of the Reinforced Concrete Beam

The article researches the influencing factors in seismic reliability of reinforced concrete beam and analyzes the influential regular pattern of factors on the calculation of the seismic reliability to provide reference for design and reinforcement of reinforced concrete beam. The JC checking point method considering the distribution of variables is used to analyze the bending reliability and sheafing reliability of the reinforced concrete beam. Study shows that bending reliability increases with the increase of reinforcement ratio and strain rate and decreases with the increase of load ratio. Shearing reliability increases with the increase of strain rates and the amplifying coefficient of shear force and increases with the decrease of stirrup ratio and load ratio . What＇ s more, the bending reliability and shearing reliability have little or no change with the change of the geometry （ width, height, the thickness of protective layer, stirrup spacing）. Obviously, the reinforcement ratio, load ratio and strain rate have great influence on the bending reliability and the geometry has little influence on it. In addition, stirrup ratio, load ratio, strain rate and the amplifying coefficient of shear force have great influence on sheafing reliability and geometry has little influence on it.