新型高强钢管格栅拱架接头抗弯性能分析  

Analysis on Flexural Performance of Circumferential Joint of New High-Strength Steel Pipe Grid Arch

作　　者：宋远 黄明利[2] 李然 李怀宾 Song Yuan;Huang Mingli;Li Ran;Li Huaibin(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan,Anhui 232001,P.R.China;Key Laboratory for Urban Underground Engineering of the Education Ministry,Beijing Jiaotong University,Beijing 100044,P.R.China;China Railway No.4 Engineering Group Co.,Ltd.,Hefei 230023,P.R.China;School of Safety Science and Engineering,Anhui University of Science and Technology,Huainan,Anhui 232001,P.R.China)

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001 [2]北京交通大学城市地下工程教育部重点实验室,北京100044 [3]中铁四局集团有限公司,合肥230023 [4]安徽理工大学安全科学与工程学院,安徽淮南232001

出　　处：《地下空间与工程学报》2024年第5期1600-1612,共13页Chinese Journal of Underground Space and Engineering

基　　金：安徽理工大学引进人才科研启动基金(2022yjrc85);安徽省高等学校自然科学研究项目(2023AH051202);云南省重点研发计划(202303AA080014);大学生创新创业训练计划项目(202310361109);安徽省博士后科研活动资助项目(2022B642)。

摘　　要：拱架接头作为整环结构受力及变形的薄弱部位,合理的接头型式是结构设计的关键,其力学特性对准确评价整体承载性能至关重要。为评估高强钢管格栅螺栓端板接头和组合套筒接头的受力性能,开展了接头足尺抗弯试验和数值模拟,探讨了两种接头的破坏形态、变形挠度、承载力及应力应变等特征指标的变化规律,并对接头抗弯刚度和承载力进行了定量评价。结果表明:在加载过程中两种接头呈现出典型的弹性增长阶段、塑性发展阶段、稳定承载阶段或残余强度阶段;螺栓端板接头表现为平滑曲线形破坏模式,组合套筒接头表现为折曲形破坏模式;相较于组合套筒接头,螺栓端板接头的极限弯矩提高了46.4 kN·m,相应的挠度减小了18.5 mm,初始抗弯刚度和使用阶段抗弯刚度分别提高了1011 kN·m 2和877 kN·m 2;两种接头的钢管应变响应规律基本一致,呈现出外环受压、内环受拉的分布特征,外侧受压率先进入屈服阶段;螺栓端板接头变形受力稳定,开口变形量小,螺栓安全系数高;组合套筒接头承载能力较低,可变形程度较高。研究成果可为隧道工程钢管格栅支护结构的接头设计及工程应用提供借鉴。As the weak part of the force and deformation of the whole ring arch structure,the joint type is the key to the structural design,and its mechanical characteristics are very important for accurate evaluation of the overall bearing performance.In order to evaluate the force performance of the bolted endplate joint and the combined sleeve joint of the high-strength steel pipe grid,the bending test of the local full-length joint was carried out,the changeable law of the failure form,vertical deflection,bearing capacity and stress strain of the two joint components was discussed,and the bending stiffness and bearing capacity of the joints were quantitatively evaluated.The results showed that during the whole loading process,the two kinds of joints showed typical elastic growth stage,plastic development stage,stable bearing stage or residual strength stage.The bolted endplate joint showed a smooth curved failure mode,and the combined sleeve joint showed a broken line failure mode.Compared with the combined sleeve joint,and the ultimate bending moment of the bolted endplate joint was 46.4 kN·m higher than that of the combined sleeve joint,the deflection was reduced by 18.5 mm,and the bending stiffness at initial stage and service stage of the bolted endplate joint were also increased by 1011 kN·m 2 and 877 kN·m 2.The strain response law of the steel tube of the two kinds of joints was basically the same,showing the distribution characteristics of the outer ring being compressed and the inner ring being stretched,and will enter the yield stage first due to the outer compression.The stress of bolted endplate joint was stable during the loading process,the opening deformation of the endplate was small,and the safety factor of bolts was high.The bearing capacity of the combined sleeve joint was weak,the deformation range was large.The research results could provide a certain reference for the joint design and engineering application of steel pipe grid support structure in tunnel engineering.

关 键 词：隧道工程 高强钢管格栅 接头型式 抗弯性能 模型试验 数值模拟 

分 类 号：U454[建筑科学—桥梁与隧道工程]