中文摘要：

为了给大跨径斜拉桥宽幅钢箱梁的悬拼施工方法提供参考,针对斜拉桥宽幅钢箱梁悬拼匹配过程中横向错缝过大的问题,以港珠澳大桥主体工程中跨径最大的青州航道桥为研究背景,采用大型通用有限元程序ABAQUS建立了青州航道桥悬拼梁段的精细化板壳单元分析模型,并在保证分析精度的基础上尽量采用维度较小的单元类型模拟结构,研究了钢箱梁悬拼匹配过程中悬臂梁段和起吊梁段的横向变形规律,分析了斜拉索索力、悬臂梁段自重、吊机自重与起吊梁段引起的吊机前支点反力的影响程度,探讨了青州航道桥中钢箱梁的合理悬拼匹配工序及现场应对策略。研究结果表明：钢箱梁悬拼过程中的横向变形以横向弯曲变形为主,畸变、扭转等变形较小;起吊梁段引起的吊机前支点反力是引起悬臂梁段和起吊梁段横向错缝过大的最主要因素;传统的从桥面中心线处向两边逐步施焊或通过焊接连接边腹板逐步向桥面中线处焊接的联系方式均不能适应青州航道桥宽幅钢箱主梁的悬拼匹配施工,应优先连接横向刚度较大的边腹板,再通过采取对吊机卸载的方式,待悬臂梁段和起吊梁段横向变形接近一致,完成全截面的临时匹配时;港珠澳大桥青州航道桥的桥面吊机卸载比例为40%。

英文摘要：

To provide a reference for cantilever erection construction for wide steel box girder of long-span cable-stayed bridge,aimed at the problem of large lateral breaking joint of wide steel box girder in cantilever erection matching,the Qingzhou Channel Bridge,which has the largest span in Hong Kong-Zhuhai-Macao Bridge project,was used as research background.Large general finite element program ABAQUS was used to establish the refined plate and shell element analysis model of cantilever beam section in Qingzhou Channel Bridge.Under the ensuring of the analysis precision,smaller unit types were adopted to simulate the structure as much as possible.Transverse deformation laws of lifting and cantilever girders were investigated in the process ofthe steel box girder cantilever matching.The influence degrees from several factors including cable force of the stayed cable,dead weights of cantilever section and crane,and counterforce of first pivot of crane caused by lifting girder were analyzed.Reasonable cantilever matching process and field coping strategies in steel box girder of Qingzhou Channel Bridge were also discussed.The results show that,transverse bending deformation is the most obvious in the process of steel box girder cantilever horizontal deformation,in the meantime,distortion and torsion deformation is very small.Counterforce of first pivot of crane caused by lifting girder is the main factor which causes too much transverse staggered joints in lifting and cantilever girders.Tradition welding sequence,from the center line to both sides or from edge web to the center line,can’t adapt to the wide steel box girder matching cantilever construction of Qingzhou Channel Bridge.Larger web side with big transverse stiffness should be preferential attached. When the lateral deformations of cantilever and lifting girders are close to agreement by crane unloading,the temporary matching of whole cross section can be completed.Crane unloading ratio of is 40%in Qingzhou Channel Bridge of Hong Kong-Zhuhai-Macao Bridge.