大跨劲性骨架钢管混凝土拱桥新型栓焊节点叠合构件偏压力学性能研究  

Study on Eccentric Compressive Mechanical Performance of New Bolt-welded Joint Composite Member of Large-span Rigid-frame CFST Arch Bridge

作　　者：于鹏 郭子康[1] 云惟经 郭晓 YU Peng;GUO Zikang;YUN Weijing;GUO Xiao(School of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures(Guangxi University),Nanning 530004,China;Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,Guangxi University,Nanning 530004,China;Engineering Mechanics Research Center,Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]省部共建特色金属材料与组合结构全寿命安全国家重点实验室(广西大学),广西南宁530004 [3]广西大学工程防灾与结构安全教育部重点实验室,广西南宁530004 [4]广西大学工程力学研究中心,广西南宁530004

出　　处：《湖南大学学报(自然科学版)》2025年第3期29-46,共18页Journal of Hunan University:Natural Sciences

基　　金：青年人才托举工程资助项目(YESS20210178);广西重点研发计划资助项目(桂科AB22036007);广西高校引进海外高层次人才“百人计划”;广西大学自然科学与技术创新发展倍增计划(2023BZRC020)。

摘　　要：在地形复杂、条件恶劣地区的大跨钢管混凝土拱桥建设中,拱肋采取传统焊缝连接施工难度高且节点质量无法保障.在此基础上提出了一种新型栓焊节点,有效降低施工难度的同时保障了节点质量.采用钢管混凝土新型栓焊节点与外包混凝土组成的劲性骨架(叠合构件)作为拱肋不仅能提升结构承载力,还能改善节点与外包混凝土之间的黏结性能,具有广阔应用前景.由于拱肋受力特点为小偏心受压,为研究钢管混凝土新型栓焊叠合构件的偏压力学性能,开展了缩尺钢管混凝土叠合构件偏压试验,研究不同节点形式下(焊缝连接、栓焊连接)叠合构件之间的力学性能差异,并通过有限元分析进一步探讨了叠合构件的力学行为以及栓焊节点设计的影响.结果表明,小偏压下钢管混凝土部分提供叠合构件的主要承载力,增加外包混凝土中配筋数量能有效提高叠合构件承载力.新型栓焊节点在满足节点安全施工的前提下为叠合构件提供了更加优良的节点性能,提高节点稳定性的同时增强了节点与外包混凝土之间的相互作用,保证叠合构件承载力的同时又提升了延性.当采用钢管混凝土栓焊节点连接形式时,栓焊弧长比应控制在2.00以内.In the construction of large-span concrete-filled steel tube(CFST)arch bridges in complex terrain and harsh conditions,the construction of traditional welded joint connection of arch ribs is of high difficulty and unstable quality assurance.To address this,a new bolt-welded joint connection was proposed,which effectively reduced the difficulty of joint construction and ensured the quality of the joint.Furthermore,by using the rigid-frame(composite member)composed of CFST with the new bolt-welded joint and the outer reinforced concrete as the ribs of the arch bridge,the bearing capacity of the entire structure was improved,along with the adhesive property between the steel tube joint and the outer concrete,offering broad application prospect.Given the characteristic of small eccentric compression in arch ribs,this study investigates the mechanical performance of composite members with the new bolt-welded joint through eccentric compression tests.The mechanical differences between the composite members with different connection forms(welded joint and bolt-welded joint)were compared,and the finite element analysis was performed to further discuss the mechanical behaviour of composite members and effects of the design of the bolt-welded joint.The results indicate that the inner CFST of composite members primarily contributes to the bearing capacity under small eccentric compression.Increasing the amount of the reinforcements in the outer concrete can effectively improve the bearing capacity of composite members.New bolt-welded joint can provide superior joint performance for composite members while ensuring the safety of joint construction,which enhances the stability of the joint and improves the interaction with the outer concrete,further ensuring bearing capacity and improving ductility of composite members.When adopting the bolt-welded joint for CFST connections,the bolt-welded arc length ratio should be within 2.00.

关 键 词：劲性骨架钢管混凝土拱桥 栓焊节点 叠合构件 偏压 力学性能 数值分析 

分 类 号：TU389.9[建筑科学—结构工程]