基于参数敏感性分析的斜拉桥转体施工线形控制

Line shape control of cable-stayed bridge with rotating construction based on parameter sensitivity analysis

以福建龙岩大桥为背景,依照大桥实际施工过程,建立该斜拉桥转体施工有限元分析模型。由于场地限制,大桥施工需要二次转体阶段。为确定斜拉桥转体施工中敏感性因素的影响,在二次转体阶段,选取不同的施工影响因素进行施工控制参数敏感性分析,利用归一化分析方法,得出对主梁线形影响程度最大的施工敏感性因素。基于有限元计算建立学习样本,以BP神经网络为基础,建立斜拉桥转体施工线形控制参数识别模型,将识别结果应用到斜拉桥实际转体施工控制中,以确保转体合龙顺利进行。

Based on Longyan bridge,Fujian province,this paper uses finite element calculation software to establish the finite element analysis model of cable-stayed bridge with rotating construction.Due to the limitation of the site,the bridge construction needs a second rotation.In order to determine the influence of sensitive factors in the swivel construction of cable-stayed bridge,different construction influencing factors are selected for sensitivity analysis of construction parameters,and the construction sensitivity factors with the greatest influence on the main girder line shape are obtained by using the normalization analysis method in the second rotation stage of the bridge.Based on the finite element calculation,learning samples are established,and the identification model of line shape control parameters of cable-stayed bridge rotation construction is established based on BP neural network.The identification results are applied to the actual construction control of cable-stayed bridge to ensure the smooth turning closure.