ELM响应面在大跨度刚构桥悬臂施工可靠度研究中的应用  

Application of ELM Response Surface in Cantilever Construction Reliability Research of Long Span Rigid Frame Bridge

作　　者：谢旭 曹宇辞 XIE Xu;CAO Yu-ci(Hunan Lianzhi Technology Co.,Ltd.,Changsha,Hunan 410203,China;Hunan Academy of Transportation Sciences Co.,Ltd.,Changsha,Hunan 410015,China)

机构地区：[1]湖南联智科技股份有限公司,湖南长沙410203 [2]湖南省交通科学研究院有限公司,湖南长沙410015

出　　处：《黑龙江交通科技》2023年第10期78-80,96,共4页Communications Science and Technology Heilongjiang

摘　　要：为研究大跨度预应力钢筋混凝土连续刚构桥悬臂施工阶段结构可靠度,提出了一种基于极限学习机(ELM)响应面法的可靠度计算方法,以沱江大桥为工程背景,在有限元数值计算模型的基础上生成了随机变量分布与结构主梁挠度响应的训练集与验证集,采用极限学习机模型进行学习拟合,并根据建立的响应面模型进行可靠度分析计算。结果表明:基于极限学习机拟合的大跨度刚构桥挠度响应精度较高,验证集平均误差仅为2.01%;在一定区间内结构可靠度与悬臂端挠度容许值呈线性相关关系;保证结构悬臂施工阶段可靠度大于4.0的前提下,短、中、长悬臂施工阶段最大挠度容许值分别为4、9、19 mm。In order to study the structural reliability of long span prestressed reinforced concrete continuous rigid frame bridges during cantilever construction,a reliability calculation method based on the Extreme Learning Machine(ELM)response surface method was proposed.Taking the Tuojiang bridge as an engineering background,a training set and a verification set for the distribution of random variables and the deflection response of the main beam of the structure were generated based on the finite element numerical calculation model,and the ELM model was used for learning fitting,reliability analysis and calculation are conducted based on the established response surface model.The results show that the deflection response accuracy of long span rigid frame bridges based on limit learning machine fitting is high,and the average error of the validation set is only 2.01%;There is a linear correlation between structural reliability and allowable cantilever end deflection within a certain range;On the premise that the reliability of the structural cantilever construction stage is greater than 4.0,the maximum allowable deflection values for short,medium and long cantilever construction stages are 4,9,19 mm,respectively.

关 键 词：连续刚构桥 可靠度 极限学习机 响应面法 悬臂施工 

分 类 号：U445.4[建筑科学—桥梁与隧道工程]