不同脱空缺陷对栓焊连接钢管混凝土轴压力学性能的影响研究  

Influence Study of Different Gap Imperfection on the Axial Compression Properties of Bolt-welded CFST

作　　者：黄蓉 何发青 于思柳 云惟经 HUAN GRong;HEFa-qing;YU Si-liu;YUN Wei-jing(Guangxi Tourism Development Group Co.Ltd.,Nanning 530201,China;Luocheng Mulao Autonomous County Development and Reform Bureau,Hechi 546400,China;Guangxi Polytechnic of Construction,Nanning 530007,China;School of Civil Engineering/Key Laboratory of Engineering Disaster Prevention and Structural Safety of the Ministry of Education of Guangxi University/Guangxi Key Laboratory of Disaster Prevention and Mitigation and Engineering Safety/Engineering Mechanics Research Center of Guangxi University,Nanning 530004,China)

机构地区：[1]广西旅游发展集团有限公司,南宁市530201 [2]罗城仫佬族自治县发展和改革局,河池市546400 [3]广西建设职业技术学院,南宁市530007 [4]广西大学土木建筑工程学院/广西大学工程防灾与结构安全教育部重点试验室/广西防灾减灾与工程安全重点试验室/广西大学工程力学研究中心,南宁市530004

出　　处：《公路》2024年第12期149-156,共8页Highway

基　　金：国家自然科学基金面上项目,项目编号51878786;国家自然科学基金重点项目,项目编号51738004;广西重点研发计划项目,项目编号AB22036007。

摘　　要：大跨钢管混凝土拱桥施工过程中,钢管与核芯混凝土之间容易存在初始缺陷。本研究基于天峨龙滩特大桥拱肋栓焊节点拟设计方案,以栓焊连接钢管混凝土中球冠形与月牙形两种脱空缺陷为研究对象,从破坏形态、荷载~竖向位移曲线、荷载~应变曲线等方面分析两种缺陷对钢管混凝土短柱力学性能的影响。结果表明,与无缺陷试件相比,球冠形脱空率分别为2.3%、4.6%和6.9%时,栓焊节点短柱的极限强度分别降低了7.63%、8.40%和15.41%;月牙形环向脱空角度为90°、180°、270°对应的构件承载力分别降低了2.52%、5.88%及7.56%;月牙形环向脱空缺陷对承载力的降低程度低于球冠形脱空缺陷,且轴压作用下,栓焊节点的存在使短柱中部鼓曲位置转移至节点偏上或偏下位置。Initial defects may occur between the steel tube and the core concrete during the construction of large-span Concrete-Filled Steel Tubular(CFST)arch bridge.This paper is based on the proposed design scheme of the arch rib bolt-welded joints of the Tian'e Longtan Bridge,taking the spherical-cap gap and circumferential gap in bolt-welded CFST as the research object,the influence of defects on the mechanical properties of CFST short columns is analyzed from the failure mode,load displacement curve,load-strain curve,etc.The results show that when the defects ratios of spherical-cap gap are 2.3%,4.6%and 6.9%,the ultimate strength of the members decreases 7.63%,8.40%,and15.41%respectively compared with the no-imperfection specimens.The bearing capacity drops 2.52%,5.88%,and 7.56%with the circumferential gap angles 900,1800,and 2700 of circumferential gap.The reduction degree of the bearing capacity of the circumferential gap is lower than that of the spherical-cap gap,and under the action of axial pressure,the bolt-welded joint shifts the bulging position in the middle of the stub to the top and bottom of the joints.

关 键 词：桥梁工程 钢管混凝土 脱空缺陷 栓焊连接节点 轴压力学性能 

分 类 号：U448.222[建筑科学—桥梁与隧道工程] U445.57[交通运输工程—道路与铁道工程]