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高强度耐火钢高温冷却后力学性能试验研究

楼国彪 费楚妮 王彦博 陈林恒

楼国彪, 费楚妮, 王彦博, 陈林恒. 高强度耐火钢高温冷却后力学性能试验研究[J]. 工程力学, 2022, 39(9): 153-159. doi: 10.6052/j.issn.1000-4750.2021.05.0380
引用本文: 楼国彪, 费楚妮, 王彦博, 陈林恒. 高强度耐火钢高温冷却后力学性能试验研究[J]. 工程力学, 2022, 39(9): 153-159. doi: 10.6052/j.issn.1000-4750.2021.05.0380
LOU Guo-biao, FEI Chu-ni, WANG Yan-bo, CHEN Lin-heng. EXPERIMENTAL STUDY ON POST-FIRE MECHANICAL PROPERTIES OF HIGH STRENGTH FIRE-RESISTANT STEEL[J]. Engineering Mechanics, 2022, 39(9): 153-159. doi: 10.6052/j.issn.1000-4750.2021.05.0380
Citation: LOU Guo-biao, FEI Chu-ni, WANG Yan-bo, CHEN Lin-heng. EXPERIMENTAL STUDY ON POST-FIRE MECHANICAL PROPERTIES OF HIGH STRENGTH FIRE-RESISTANT STEEL[J]. Engineering Mechanics, 2022, 39(9): 153-159. doi: 10.6052/j.issn.1000-4750.2021.05.0380

高强度耐火钢高温冷却后力学性能试验研究

doi: 10.6052/j.issn.1000-4750.2021.05.0380
基金项目: 国家自然科学基金项目(5201001048);应急管理部消防救援局重点攻关项目(2019XFGG10)
详细信息
    作者简介:

    楼国彪(1975−),男,浙江人,副教授,博士,博导,从事多高层钢结构及钢结构抗火研究(E-mail: gblou@tongji.edu.cn)

    费楚妮(1997−),女,浙江人,硕士生,从事钢结构抗火研究(E-mail: fcn611@163.com)

    陈林恒(1983−),男,湖北人,高工,博士,南钢研究院副院长,从事先进钢材及加工制备(E-mail: chenlinheng@njsteel.com.cn)

    通讯作者:

    王彦博(1983−),男,河南人,副教授,博士,硕导,从事高强钢结构和高性能组合结构研究(E-mail: ybwang@tongji.edu.cn)

  • 中图分类号: TU541

EXPERIMENTAL STUDY ON POST-FIRE MECHANICAL PROPERTIES OF HIGH STRENGTH FIRE-RESISTANT STEEL

  • 摘要: 该文对国产Q460FR、Q420FR、Q345FR等高强度耐火钢进行了200℃~800℃高温过火、自然冷却后的拉伸试验,在获得高强度耐火钢高温冷却后的应力-应变关系曲线和力学性能参数,并与普通结构钢的高温冷却后力学参数进行对比后,给出了屈服强度和抗拉强度变化系数拟合公式。研究表明:国产高强度耐火钢在高温冷却后的屈服强度和抗拉强度均得到提高,弹性模量基本稳定。该文研究的结果可以用来评估耐火钢结构火灾后的承载性能。
  • 图  1  试样尺寸

    Figure  1.  Specimen dimensions

    图  2  试验设备

    Figure  2.  Test equipment

    图  3  高温冷却后拉伸试样破坏情况

    Figure  3.  Failure of tensile specimen after fire

    图  4  耐火钢过火后的应力-应变关系曲线

    Figure  4.  Post-fire stress-strain curves of fire-resistant steel

    图  5  耐火钢过火后力学参数变化曲线

    Figure  5.  Variation curves of mechanical parameters of fire-resistant steel after fire

    图  6  屈服强度对比曲线

    Figure  6.  Contrast curve of yield strength

    图  7  抗拉强度对比曲线

    Figure  7.  Contrast curve of tensile strength

    图  8  过火后屈服强度变化系数拟合公式曲线

    Figure  8.  Recommended formula curve of yield strength variation coefficient after fire

    图  9  过火后抗拉强度变化系数拟合公式曲线

    Figure  9.  Recommended formula curve of tensile strength variation coefficient after fire

    表  1  耐火钢的化学成分表[3]

    Table  1.   Chemical composition of fire-resistant steel

    牌号 化学成分质量分数/(%)
    PCMnNbSiMoTiCrVSAl
    Q460FR 0.01 0.05 0.78 0.09 0.19 0.20 0.01 0.50 0.03 0.001 0.03
    Q420FR 0.01 0.05 0.60 0.05 0.19 0.20 0.01 0.46 0.03 0.001 0.02
    Q345FR 0.01 0.04 0.40 0.05 0.17 0.19 0.02 0.42 0.03 0.001 0.04
    下载: 导出CSV

    表  2  耐火钢过火后弹性模量参数

    Table  2.   Elastic modulus parameters of fire-resistant steel after fire

    T/(℃)Q345FRQ420FRQ460FR
    E/GPa$ {\eta }_{\mathrm{E}} $E/GPa$ {\eta }_{\mathrm{E}} $E/GPa$ {\eta }_{\mathrm{E}} $
    20 205.8 1.00 211.7 1.00 201.8 1.00
    200 1.03 1.02 0.99
    400 1.02 1.01 0.98
    600 1.01 1.00 0.98
    800 1.02 1.01 0.98
    注:T为温度;E为弹性模量;$ {\mathrm{\eta }}_{\mathrm{E}} $为弹性模量折减系数。
    下载: 导出CSV

    表  3  耐火钢过火后屈服强度参数

    Table  3.   Yield strength parameters of fire-resistant steel after fire

    T/(℃)Q345FR Q420FR Q460FR
    fy/MPa$ {\eta }_{f\mathrm{y}} $fy/MPa$ {\eta }_{f\mathrm{y}} $fy/MPa$ {\eta }_{f\mathrm{y}} $
    20 440 1.00 438 1.00 492 1.00
    200 443 1.01 438 1.00 507 1.03
    300 450 1.02 440 1.00 475 0.97
    400 440 1.00 375 0.86 487 0.99
    450 446 1.01 416 0.95 496 1.01
    500 451 1.03 443 1.01 502 1.02
    550 457 1.04 457 1.04 528 1.07
    600 511 1.16 476 1.09 565 1.15
    650 543 1.23 538 1.23 610 1.24
    700 550 1.25 529 1.21 601 1.22
    750 529 1.20 484 1.11 524 1.07
    800 456 1.04 373 0.85 347 0.71
    注:T为温度;fy为屈服强度;$ {\eta }_{f\mathrm{y}} $为屈服强度折减系数。
    下载: 导出CSV

    表  4  耐火钢过火后抗拉强度参数

    Table  4.   Tensile strength parameters of fire-resistant steel after fire

    T/(℃)Q345FR Q420FR Q460FR
    fu/MPa$ {\eta }_{{f}_{\text{u}}} $fu/MPa$ {\eta }_{{f}_{\text{u}}} $fu/MPa$ {\eta }_{{f}_{\text{u}}} $
    20 550 1.00 570 1.00 653 1.00
    200 534 0.97 568 1.00 649 0.99
    300 550 1.00 568 1.00 614 0.94
    400 537 0.98 545 0.96 613 0.94
    450 545 0.99 573 1.01 602 0.92
    500 540 0.98 565 0.99 592 0.91
    550 530 0.96 569 1.00 605 0.93
    600 569 1.03 582 1.02 633 0.97
    700 584 1.06 593 1.04 628 0.96
    750 539 0.98 538 0.94 579 0.89
    800 482 0.88 474 0.83 516 0.79
    注:T为温度;fu为抗拉强度;$ {\eta }_{{f}_{\text{u}}} $为抗拉强度折减系数。
    下载: 导出CSV

    表  5  耐火钢过火后伸长率参数

    Table  5.   Elongation parameters of fire-resistant steel after fire

    T/(℃)Q345FR Q420FR Q460FR
    A/(%)ηAA/(%)ηAA/(%)ηA
    20 25.6 1.00 23.5 1.00 27.3 1.00
    200 25.9 1.01 27.1 1.16 23.4 0.86
    300 25.7 1.00 24.5 1.04 22.7 0.83
    400 21.8 0.85 24.7 1.05 21.0 0.77
    450 23.8 0.93 25.5 1.09 22.7 0.83
    500 33.0 1.29 27.3 1.16 24.6 0.90
    550 32.7 1.28 28.7 1.22 29.8 1.09
    600 25.6 1.00 27.2 1.16 26.3 0.96
    650 29.2 1.14 27.3 1.16 25.2 0.92
    700 27.5 1.07 27.3 1.16 27.3 1.00
    750 27.5 1.07 25.3 1.08 29.4 1.08
    800 31.5 1.23 32.0 1.36 30.5 1.12
    注:T为温度;A为伸长率;ηA为伸长率折减系数。
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-05-22
  • 录用日期:  2021-11-05
  • 修回日期:  2021-09-28
  • 网络出版日期:  2021-11-05
  • 刊出日期:  2022-09-01

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