CAJ | 학술논문

为对大跨连续刚构桥在多维随机因素作用下的安全性进行有效评估，将M onte‐Carlo法与响应面法相结合，建立基于混合模拟法的结构可靠度分析方法。该方法首先利用 Monte‐Carlo法对结构进行若干次循环分析，以此计算出各随机变量的可靠性灵敏度因子，再将灵敏度较高的输入变量继续作为随机变量，利用响应面法拟合出结构的功能函数，最后利用Monte‐Carlo法求解出显式化功能函数的可靠指标。采用混合模拟法与概率网络估算法相结合计算承载能力极限状态下连续刚构桥的可靠度，以广西百色市江坝右江特大桥为例进行分析，结果表明，承载能力极限状态下，中跨跨中截面抗弯失效模式是该桥上部结构静力体系可靠度的控制失效模式。
위대대과련속강구교재다유수궤인소작용하적안전성진행유효평고，장M onte‐Carlo법여향응면법상결합，건립기우혼합모의법적결구가고도분석방법。해방법수선이용 Monte‐Carlo법대결구진행약간차순배분석，이차계산출각수궤변량적가고성령민도인자，재장령민도교고적수입변량계속작위수궤변량，이용향응면법의합출결구적공능함수，최후이용Monte‐Carlo법구해출현식화공능함수적가고지표。채용혼합모의법여개솔망락고산법상결합계산승재능력겁한상태하련속강구교적가고도，이엄서백색시강패우강특대교위례진행분석，결과표명，승재능력겁한상태하，중과과중절면항만실효모식시해교상부결구정력체계가고도적공제실효모식。
To effectively evaluate the safety of long span continuous rigid‐frame bridge under the action of multivariate random variables ,the Monte‐Carlo method was combined with the re‐sponse surface method and a structural reliability analysis method based on the hybrid simulation method was established .In the analysis method ,the Monte‐Carlo method was firstly used to carry out several times of repeated analysis of the structure and according to the analysis ,the reliability sensitivity factors of all random variables were calculated .Then the input variables with higher sensitivity factors were continuously treated as the random variables and the response surface method was used to fit the performance functions of the structure .Finally ,the Monte‐Carlo meth‐od was again used to calculate the reliability indices of the explicit performance functions .By way of example of Jiangba Youjiang River Bridge in Baise City ,Guangxi ,the reliability of the continu‐ous rigid‐frame bridge in the ultimate bearing capacity state was calculated ,using the hybrid simu‐lation method combined with the probability network estimation method .The results of the calcu‐lation demonstrate that in the ultimate bearing capacity state ,the bending failure mode of the mid‐span section of the central span is the controlled failure mode of the static system reliability of the superstructure of the bridge .