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钢管混凝土KK型节点疲劳性能试验

吴庆雄 罗健平 杨益伦 陈康明 缪承谕 中村聖三

吴庆雄, 罗健平, 杨益伦, 陈康明, 缪承谕, 中村聖三. 钢管混凝土KK型节点疲劳性能试验[J]. 交通运输工程学报, 2024, 24(1): 100-116. doi: 10.19818/j.cnki.1671-1637.2024.01.006
引用本文: 吴庆雄, 罗健平, 杨益伦, 陈康明, 缪承谕, 中村聖三. 钢管混凝土KK型节点疲劳性能试验[J]. 交通运输工程学报, 2024, 24(1): 100-116. doi: 10.19818/j.cnki.1671-1637.2024.01.006
WU Qing-xiong, LUO Jian-ping, YANG Yi-lun, CHEN Kang-ming, MIAO Cheng-yu, NAKAMURA Shozo. Fatigue performance experiment of concrete-filled steel tubular-KK joint[J]. Journal of Traffic and Transportation Engineering, 2024, 24(1): 100-116. doi: 10.19818/j.cnki.1671-1637.2024.01.006
Citation: WU Qing-xiong, LUO Jian-ping, YANG Yi-lun, CHEN Kang-ming, MIAO Cheng-yu, NAKAMURA Shozo. Fatigue performance experiment of concrete-filled steel tubular-KK joint[J]. Journal of Traffic and Transportation Engineering, 2024, 24(1): 100-116. doi: 10.19818/j.cnki.1671-1637.2024.01.006

钢管混凝土KK型节点疲劳性能试验

doi: 10.19818/j.cnki.1671-1637.2024.01.006
基金项目: 

国家自然科学基金项目 52078137

国家自然科学基金项目 51678154

详细信息
    作者简介:

    吴庆雄(1973-),男,福建南靖人,福州大学研究员,工学博士,从事组合桥梁与结构工程研究

    通讯作者:

    陈康明(1985-),男,福建霞浦人,福州大学研究员,工学博士

  • 中图分类号: U441.4

Fatigue performance experiment of concrete-filled steel tubular-KK joint

Funds: 

National Natural Science Foundation of China 52078137

National Natural Science Foundation of China 51678154

More Information
  • 摘要:

    为研究钢管混凝土KK(CFST-KK)型节点疲劳性能,开展了CFST-KK型节点模型疲劳试验,分析了CFST-KK型节点热点应力分布规律和疲劳性能演化过程;建立了CFST-KK型节点实体有限元模型,结合试验和有限元结果,分析了CFST-KK型节点与钢管混凝土K(CFST-K)型节点疲劳性能的差异性;研究了不同参数对KK型节点疲劳性能影响,探讨了适用于CFST-KK型节点疲劳寿命的评价方法。研究结果表明:采用二次外推方式计算的CFST-KK型节点,最大热点应力位于受拉支管相贯焊缝的主管侧冠点偏外鞍点15°处;计算CFST-KK型节点应力集中系数时,支管名义应力可仅考虑轴力和面内弯矩的影响而不考虑面外弯矩的影响,其应力集中系数为6.36,比CFST-K型节点大80.2%;CFST-KK型节点的疲劳裂纹萌生于最大热点应力处,在反复加载过程中裂纹沿焊趾根部向两侧与主管壁厚方向延伸,裂纹向外鞍点扩展的速度要略快于向内鞍点扩展的速度,停止反复加载后裂纹并未贯穿主管管壁;受支管面外弯矩与支管间空间效应的影响,CFST-KK型节点的抗疲劳性能与CFST-K型节点有明显差异;主管内填混凝土能提升CFST-KK型节点径向刚度,缓解应力集中情况;支管面外夹角增大会增大支管间空间效应的影响;考虑钢管内混凝土影响的CFST-K型节点的热力应力与疲劳寿命曲线在评价CFST-KK型节点疲劳寿命时具有良好的精度。

     

  • 图  1  CFST-K型节点模型(单位:mm)

    Figure  1.  Model of CFST-K joint (unit: mm)

    图  2  CFST-KK型节点模型(单位:mm)

    Figure  2.  Model of CFST-KK joint (unit: mm)

    图  3  CFST-KK型节点试验加载整体布置

    Figure  3.  Overall arrangement of CFST-KK joint test loading

    图  4  应变与位移测点布置

    Figure  4.  Measurement points arrangement of strain and displacement

    图  5  材性试验

    Figure  5.  Material properties test

    图  6  FST-KK型节点实体有限元模型

    Figure  6.  Solid finite element model of CFST-KK joint

    图  7  主管轴向荷载-位移曲线

    Figure  7.  Axial load-displacement curves of chord

    图  8  CFST-KK型节点受拉侧主支管测点应变

    Figure  8.  Strains of measurement points of chord and brace on tension side of CFST-KK joint

    图  9  CFST-KK型节点热点应力外推方法

    Figure  9.  Extrapolation method of hot spot stresses of CFST-KK joint

    图  10  受拉支管相贯焊缝主管侧热点应力对比

    Figure  10.  Comparison of hot spot stresses on chord side of intersecting weld of tension brace

    图  11  名义应力分解

    Figure  11.  Nominal stress decomposition

    图  12  不同工况下CFST-KK型节点简图与边界条件

    Figure  12.  Schematics and boundary conditions of CFST-KK joint under different working conditions

    图  13  不同工况下CFST-KK型节点热点应力

    Figure  13.  Hot spot stresses of CFST-KK joints under different working conditions

    图  14  受拉支管加载次数-应变曲线

    Figure  14.  Loading times-strain curves of tension branch

    图  15  反复加载次数-动应变曲线

    Figure  15.  Repeated loading times-dynamic strain curves

    图  16  无损检测

    Figure  16.  Nondestructive testing

    图  17  疲劳裂纹发展

    Figure  17.  Development of fatigue crack

    图  18  CFST-KK型节点疲劳裂纹

    Figure  18.  Fatigue crack of CFST-KK joint

    图  19  CFST-KK与CFST-K型节点疲劳裂缝扩展过程对比

    Figure  19.  Comparison of fatigue crack propagation processes between CFST-KK and CFST-K joints

    图  20  CFST-KK与CFST-K型节点应力集中系数对比

    Figure  20.  Comparison of stress concentration factors between CFST-KK and CFST-K joints

    图  21  应力集中机理分析

    Figure  21.  Analysis on stress concentration mechanism

    图  22  KK型节点相贯区域变形

    Figure  22.  Deformations in intersectional region of KK joints

    图  23  θp对CFST-KK型节点热点应力与SCF的影响

    Figure  23.  Effects of θp on hot spot stresses and SCFs of CFST-KK joint

    图  24  疲劳设计S-N曲线

    Figure  24.  Fatigue design S-N curves

    表  1  钢材材性试验结果

    Table  1.   Test results of steel material properties

    钢材类型 弹性模量/GPa 屈服强度/MPa 极限强度/MPa 泊松比
    主管 205 368 512 0.3
    支管 206 361 501 0.3
    下载: 导出CSV

    表  2  混凝土材性试验结果

    Table  2.   Test results of concrete material properties

    混凝土标号 立方体抗压强度/MPa 棱柱体抗压强度/MPa 弹性模量/ GPa
    C40 42.8 38.1 34.5
    下载: 导出CSV

    表  3  试验模型疲劳寿命与计算值对比

    Table  3.   Comparison of fatigue life between test model and calculated values

    节点类型 出处 预测寿命/104 实测寿命/104 误差百分比绝对值/%
    钢管 CIDECT 140.87 94.00 49.86
    API 30.95 67.07
    DNV 67.00 28.72
    钢管混凝土 文献[1] 48.83 48.05
    文献[24] 91.05 3.14
    文献[25] 118.96 26.55
    文献[26] 101.92 8.43
    下载: 导出CSV
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  • 收稿日期:  2023-09-11
  • 网络出版日期:  2024-03-13
  • 刊出日期:  2024-02-25

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