连续钢箱梁桥顶推施工过程受力分析与方案优化  

Mechanical Analysis and Scheme Optimization of Incremental Launching Construction of Continuous Steel Box Girder Bridges

作　　者：张立 ZHANG Li(Shanxi Lihuo Expressway Co.,Ltd.,Changzhi,Shanxi 046200,China)

机构地区：[1]山西黎霍高速公路有限公司,山西长治046200

出　　处：《山西交通科技》2024年第3期78-80,共3页Shanxi Science & Technology of Transportation

摘　　要：为了研究钢箱梁桥在顶推施工过程中受力与变形规律,采用有限元方法对某三跨连续钢箱梁桥进行施工过程分析。分析结果表明:在未设临时支墩的情况下,钢箱梁顶推至最大悬臂状态时悬臂端最大下挠达127.3 mm,此时钢箱梁悬臂长度为49 m,导梁悬臂端变形已经超过《公路钢结构桥梁规范设计》(JTG D64—2015)限值;在PM1号墩往高速方向前方2 m处设置临时墩后,最大悬臂状态下悬臂端挠度值减小至83.7 mm,满足规范要求,同时导梁和钢箱梁的挠度、支反力、内力和应力均有不同幅度降低,全部满足规范要求。研究结果可为类似桥梁顶推施工提供一定的参考。To study the stress and deformation laws during the incremental launching construction of steel box girder bridges,this paper used the finite element method to analyze the construction process of a three-span continuous steel box girder bridge.According to the analysis results,under the condition without a temporary support pier and the box girder was incrementally launched to the maximum cantilever state,the maximum deflection at the cantilever end reached 127.3 mm and the cantilever length was 49 m.At this moment,the deformation at the cantilever end of the guide girder exceeded the limitation from Specifications for Design of Highway Steel Bridge(JTG D64—2015).After arranging a temporary pier 2 m in front of PM1Pier in the direction of the expressway,under the maximum cantilever state,the deflection at the cantilever end was reduced to 83.7 mm,and the deflection,support reactions,internal force,and stress of guide girders and steel box girders were decreased to different extents as well,which all met the specification requirements.The study results can provide certain references for similar bridge incremental launching constructions.

关 键 词：钢箱梁 顶推技术 有限元 安全分析与控制 

分 类 号：U445.462[建筑科学—桥梁与隧道工程]