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文章从变形能力的不确定方面研究了圆截面钢筋混凝土桥墩曲率极限状态,首先用直径为1.0m桥墩作为基准桥墩,通过对圆截面钢筋混凝土桥墩的弯矩-曲率分析研究了无量纲屈服、服务和破坏控制曲率极限状态与轴压比、纵筋配筋率和配箍率的关系。结果表明,轴压比是影响无量纲屈服和服务水平曲率极限状态均值的主要因素,轴压比和配箍率是影响无量纲破坏控制水平曲率极限状态均值的主要因素。然后通过回归分析建立了用于计算其它截面直径桥墩对应与不同极限状态的延性的直径调整系数的近似公式。
In this paper, the limit state of the curvature of a circular CFST pier is studied from the point of view of the deformation ability. First, the pier with a diameter of 1.0m is taken as the reference pier. The bending moment-curvature analysis of RC pier is studied. And the relationship between the limit state of failure control curvature and axial compression ratio, longitudinal reinforcement ratio and stirrup ratio. The results show that the axial compression ratio is the main factor that affects the mean value of the yield and service level curvature limit states. The axial compression ratio and the stirrup ratio are the main factors affecting the mean curvature limit state of the dimensionless failure control. Then, by regression analysis, an approximate formula of the diameter adjustment coefficient for calculating the ductility of the pier corresponding to different cross-section diameters and different limit conditions is established.