参数变异性对PC梁桥施工监控精度影响分析  

Influence Analysis of Parameter Variability on Construction Monitoring Precision of PC Girder Bridge

作　　者：汪远 姜晓勇 梁瑜 冼家荣 蔡林庭 叶锡钧[2] 姜婷 WANG Yuan;JIANG Xiao-yong;LIANG Yu;XIAN Jia-rong;CAI Lin-ting;YE Xi-jun;JIANG Ting(Guangdong Branch of China Railway Shanghai Design Institute Group Co.,Ltd.,Guangzhou 510640;Guangzhou University,Guangzhou 510006;Guangzhou City Polytechnic,Guangzhou 440111)

机构地区：[1]中铁上海设计院集团有限公司广州分院,广州510640 [2]广州大学土木工程学院,广州510006 [3]广州城市职业学院,广州440111

出　　处：《广州建筑》2023年第1期76-80,共5页GUANGZHOU ARCHITECTURE

基　　金：中铁上海设计院集团有限公司科研计划课题(集21-BZ12);广东省重点领域研发计划项目(2020B0101130005)。

摘　　要：大跨径预应力混凝土(Prestress Concrete,PC)梁桥的线形与应力状态会随着施工监控参数的变化而变化,参数的变化会影响桥梁的合龙精度与最终成桥状态的结构内力。为研究参数变异性对施工监控过程的影响,本文以一座大跨径连续刚构桥为背景,借助有限元软件分析主梁悬臂施工过程中材料容重、弹性模量、管道摩阻系数和预应力张拉力四个主要参数的变化对桥梁线形和关键截面应力的影响。结果表明:上述参数的变化主要影响结构跨中合龙段和边跨最大悬臂处的挠度,对桥墩附近节段挠度影响较小;不同参数的组合存在不同程度的耦合作用,施工监控过程中需对每个参数进行实地测试,修正有限元模型,方能更精确地指导施工。The shape and stress state of long-span PC girder bridge will change with the change of construction control parameters,which will affect the closure accuracy and the structural internal force of the final bridge.In order to study the sensitivity of construction control parameters,this paper takes a bridge as an engineering background and uses finite element simulation software,this paper analyzes the influence of material bulk density,elastic modulus and friction coefficient of prestressed pipe on the shape and stress of bridge structure during cantilever construction.The results show that the changes of the above parameters mainly affect the deflection of the closure section in the middle span and the maximum cantilever of the side span,and have little effect on the deflection of the section near the pier.In addition,the two parameter sensitivity factor analysis shows that the combination of different parameters has different degrees of coupling effect.For example,there is a certain degree of combination effect between elastic modulus and material bulk density,material bulk density and pipeline friction coefficient,but there is almost no combination effect between elastic modulus and friction coefficient;Multi factor sensitivity analysis showed that there was a certain degree of combination effect among the four parameters.

关 键 词：桥梁 施工监控 多参数敏感性 挠度 应力 

分 类 号：U448[建筑科学—桥梁与隧道工程]