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空间结构压杆的套管加固失效模式试验研究

曾滨 许庆 陈映 王春林

曾滨, 许庆, 陈映, 王春林. 空间结构压杆的套管加固失效模式试验研究[J]. 工程力学, 2022, 39(11): 212-221. doi: 10.6052/j.issn.1000-4750.2021.08.0598
引用本文: 曾滨, 许庆, 陈映, 王春林. 空间结构压杆的套管加固失效模式试验研究[J]. 工程力学, 2022, 39(11): 212-221. doi: 10.6052/j.issn.1000-4750.2021.08.0598
ZENG Bin, XU Qing, CHEN Ying, WANG Chun-lin. EXPERIMENTAL STUDY ON FAILURE MODES OF COMPRESSION MEMBERS IN SPACE STRUCTURES STRENGTHENED WITH SLEEVES[J]. Engineering Mechanics, 2022, 39(11): 212-221. doi: 10.6052/j.issn.1000-4750.2021.08.0598
Citation: ZENG Bin, XU Qing, CHEN Ying, WANG Chun-lin. EXPERIMENTAL STUDY ON FAILURE MODES OF COMPRESSION MEMBERS IN SPACE STRUCTURES STRENGTHENED WITH SLEEVES[J]. Engineering Mechanics, 2022, 39(11): 212-221. doi: 10.6052/j.issn.1000-4750.2021.08.0598

空间结构压杆的套管加固失效模式试验研究

doi: 10.6052/j.issn.1000-4750.2021.08.0598
基金项目: 国家自然科学基金重点项目(52038010);国家工业建筑诊断与改造工程技术研究中心开放基金课题项目(YZA2017KY04)
详细信息
    作者简介:

    许 庆(1978−),男,山西人,教授级高工,硕士,主要从事预应力诊治研究(E-mail: xuqing@cribc.com)

    陈 映(1990−),男,四川人,博士生,主要从事预应力预制结构研究(E-mail: chenying90@seu.edu.cn)

    王春林(1980−),男,江苏人,教授,博士,博导,主要从事预应力预制结构研究(E-mail: chunlin@seu.edu.cn)

    通讯作者:

    曾 滨(1968−),男,福建人,教授级高工,博士,博导,总工,主要从事预应力技术研究(E-mail: zengbin@cribc.com)

  • 中图分类号: TU392.3

EXPERIMENTAL STUDY ON FAILURE MODES OF COMPRESSION MEMBERS IN SPACE STRUCTURES STRENGTHENED WITH SLEEVES

  • 摘要: 空间结构压杆失稳是结构失效的重要原因之一。利用套管加固空间结构压杆以抑制压杆屈曲,增加构件的极限承载能力和延性。通过对不同壁厚、套管与内压杆间隙和内压杆外伸段长度的12根试件进行轴压试验,得到加固前后试件的极限承载能力、破坏模式和延性变化。加固后试件的极限承载能力最大提高了147%,且外套管壁厚越大,内压杆外伸段越短,承载力越高;内压杆与外套管间隙越大,承载力略有下降。加固试验中构件的破坏模式由加固前的整体屈曲失稳变化为加固后的整体失稳、内压杆端部外伸段失稳和两种耦合失稳,且壁厚越小,易发生整体失稳,外伸段越长,易发生内压杆端部失稳,间隙对失稳形态影响不明显。此外,加固后试件延性均大于未经加固内压杆,经过合理设计延性指标能够增加一倍以上。
  • 图  1  空间结构模型腹杆失稳

    Figure  1.  The instability of brace in space structure

    图  2  套管侧向支承

    Figure  2.  The lateral constraints by the outer sleeve

    图  3  试件构造

    Figure  3.  Specimen configuration

    图  4  试验装置

    Figure  4.  Testing setup

    图  5  加载制度

    Figure  5.  Loading patterns

    图  6  不同壁厚套管试件荷载-位移曲线

    Figure  6.  Load-displacement curves of different wall thickness

    图  7  不同间隙套管试件荷载-位移曲线

    Figure  7.  Load- displacement curves of different gap

    图  8  不同外伸段长度套管试件荷载-位移曲线

    Figure  8.  Load- displacement curves of different overhang length

    图  9  套管构件变形模式

    Figure  9.  Flexural deformation modes of the sleeved bar

    图  10  延性指标示意图

    Figure  10.  Schematic plot of ductility index

    图  11  有限元模型

    Figure  11.  Finite element model

    图  12  荷载-位移曲线对比

    Figure  12.  Comparison of load-deformation curves

    图  13  失效模式对比

    Figure  13.  Comparison of failure modes

    图  14  装配式套管构件

    Figure  14.  Assembled sleeve member

    表  1  套管设计尺寸

    Table  1.   Design values of sleeves /mm

    试件号试件名外套管
    总长度L
    外套管
    外径R
    外套管
    壁厚T
    内压杆外伸
    端长度L0
    间隙值g
    S2L2400g2.5T2.52400802.51002.5
    S3L2400g2.5T48342.5
    S4L2400g2.5T1095102.5
    S5L2400g5.5T48945.5
    S6L2400g8.5T49548.5
    S7L2400g10T2.5952.510
    S8L2400g2.5T68762.5
    S9L2350g2.5T623508761502.5
    S10L2450g2.5T62450876502.5
    S11L2450g2.5T48342.5
    S12L2450g2.5T1095102.5
    注:LRT分别为外套管总长度、外径和壁厚;L0为内压杆外伸端长度;g为外套管与内压杆之间间隙值,为外套管内径与内压杆外径差值的一半。
    下载: 导出CSV

    表  2  试件实测尺寸

    Table  2.   Measured values of specimens /mm

    试件号外套管
    总长度L
    外套管
    外径R
    外套管
    壁厚T
    内压杆外伸
    端长度L0
    间隙值g
    S1* 2660.53 69.86 4.26
    S2 2400.17 80.05 2.68 100.00 2.34
    S3 2397.60 83.56 4.32 103.40 2.61
    S4 2398.90 96.23 10.93 100.63 2.23
    S5 2397.87 88.95 4.18 103.70 5.26
    S6 2399.13 94.80 4.31 101.93 8.09
    S7 2399.07 94.86 2.54 100.93 9.89
    S8 2389.67 89.02 6.36 101.40 3.24
    S9 2350.07 89.42 6.52 151.47 3.24
    S10 2451.20 89.23 6.48 48.83 3.19
    S11 2451.43 83.44 4.55 49.57 2.23
    S12 2449.40 95.40 10.92 51.33 1.90
    注:S1*行中为所有试件的内压杆实测尺寸平均值。
    下载: 导出CSV

    表  3  材料性能参数

    Table  3.   Material constants

    试样弹性模量E/GPa名义屈服强度σ0.2/MPa抗拉极限强度σb/MPa断后伸长率δ/(%)
    R70T4190.87303.98462.0521.04
    R80T2.5206.51327.56488.0419.66
    R83T4193.03310.89476.5218.81
    R89T4203.62336.56465.9424.33
    R87T6195.55276.02451.1021.42
    R95T2.5206.34342.03471.0919.61
    R95T4205.08276.38459.8521.17
    R95T10209.44314.93476.2218.17
    注:R为试件外径尺寸;T为试件壁厚。
    下载: 导出CSV

    表  4  试件试验结果

    Table  4.   Test results of specimens

    试件号试件名试件峰值承载力Pmax/kN试件延性指标u
    S1107.541.67
    S2L2400g2.5T2.5164.132.55
    S3L2400g2.5T4200.133.04
    S4L2400g2.5T10265.342.07
    S5L2400g5.5T4203.852.12
    S6L2400g8.5T4189.233.95
    S7L2400g10T2.5157.543.22
    S8L2400g2.5T6227.694.28
    S9L2350g2.5T6214.152.71
    S10L2450g2.5T6220.001.82
    S11L2450g2.5T4232.153.45
    S12L2450g2.5T10260.222.35
    注:Pmax为试件峰值承载力;u为试件的延性指标,相关讨论见3.3节。
    下载: 导出CSV

    表  5  试件破坏模式

    Table  5.   Failure modes of specimens

    试件S1S2S3S4
    整体形态
    端部形态
    模式整体失稳整体失稳端部失稳端部失稳
    试件S5S6S7S8
    整体形态
    端部形态
    模式耦合失稳端部失稳整体失稳端部失稳
    试件S9S10S11S12
    整体形态
    破坏形态
    模式端部失稳端部失稳耦合失稳端部失稳
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-08-04
  • 录用日期:  2021-12-14
  • 修回日期:  2021-12-02
  • 网络出版日期:  2021-12-14
  • 刊出日期:  2022-11-01

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