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分析了映射变换法与插值法的嵌套循环特性,提出了抗力分项系数的双重迭代求解算法,应用VB编制了计算程序,计算了活恒载效应比为0.10、0.25、0.50、1.00、1.50、2.50六种工况下的构件抗力分项系数,将分项系数乘以荷载效应组合值后得到修正抗力值,针对修正抗力与荷载效应进行了可靠指标校核验算。计算结果表明:应用双重迭代算法求得构件的可靠指标均大于目标可靠指标,汽车一般运营状态下构件的可靠指标计算值与目标值的相对误差在0.62%~0.92%之间,汽车密集运行状态下两者相对误差在0.62%~0.74%之间,说明双重迭代算法计算结果可靠,且偏于安全。
The nested loop characteristics of mapping transformation and interpolation are analyzed. A double iterative algorithm is proposed to solve the resistance sub-coefficient. The calculation program is compiled by VB, and the effect of live-load effect ratio is 0.10,0.25,0.50,1.00,1.50 , 2.50 six components under the conditions of sub-item resistance factor, the sub-coefficient multiplied by the load effect combination value obtained by correcting the resistance value, the correction of resistance and load effect of a reliable indicator check calculation. The calculation results show that the reliability index of the component obtained by the double iteration algorithm is larger than the target reliability index. The relative error between the calculated value and the target value of the component in the general operation state of the automobile is between 0.62% and 0.92% The relative error between the two is between 0.62% ~ 0.74%, indicating that the double iterative algorithm is reliable and partial to safety.