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对公路钢桥结构的作用和抗力进行了统计分析并基于现行公路钢桥规范对其进行了可靠度校准.通过误差分析和现场实测得出了恒载效应的概率分布和统计参数,其中分别考虑了沥青混凝土和水泥混凝土桥面铺装层自重的不同影响.抗力分析中分别就材料性能不定性、材料及构件几何尺寸不定性和结构计算模式不定性进行了计算,从而得出了我国常用的两种桥梁用钢的抗力统计参数.按照现行规范,分别考虑不同作用效应组合、不同汽车运行状态和活载服从不同概率分布类型的情况下,采用JC法对轴拉、轴压、偏心受压、受弯和受剪等5种构件进行了可靠指标校准.最后经综合分析得出了各级结构在脆性破坏和延性破坏下的目标可靠指标建议值.
The function and resistance of highway steel bridge structure are statistically analyzed and the reliability is calibrated based on the current highway steel bridge specifications.The probability distribution and statistical parameters of dead load effect are obtained by error analysis and field measurement, The different effects of asphalt pavement and cement concrete deck pavement weight.Through the analysis of the resistance of the material, the uncertainty of the material properties, the uncertainty of the geometric dimensions of the material and the structure, and the uncertainty of the structural calculation mode, Two kinds of bridges steel resistance statistical parameters.According to the current code, considering different combinations of effects, different vehicle operating status and live load with different probability distribution types, the JC method is used to calculate the axial pull, axial compression, eccentric compression , Flexure and shear, and other five kinds of components were calibrated.At last, the recommended values of the target reliability index of the structures at all levels under brittle failure and ductile failure were obtained through comprehensive analysis.