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BFRP筋钢-混组合梁高温后力学性能试验

武芳文 陈中村 何岚清 左剑 樊州

武芳文, 陈中村, 何岚清, 等. BFRP筋钢-混组合梁高温后力学性能试验[J]. 复合材料学报, 2023, 40(5): 2938-2950. doi: 10.13801/j.cnki.fhclxb.20220804.004
引用本文: 武芳文, 陈中村, 何岚清, 等. BFRP筋钢-混组合梁高温后力学性能试验[J]. 复合材料学报, 2023, 40(5): 2938-2950. doi: 10.13801/j.cnki.fhclxb.20220804.004
WU Fangwen, CHEN Zhongcun, HE Lanqing, et al. Mechanical properties experiment of steel-concrete composite beams reinforced with BFRP bars after high temperature[J]. Acta Materiae Compositae Sinica, 2023, 40(5): 2938-2950. doi: 10.13801/j.cnki.fhclxb.20220804.004
Citation: WU Fangwen, CHEN Zhongcun, HE Lanqing, et al. Mechanical properties experiment of steel-concrete composite beams reinforced with BFRP bars after high temperature[J]. Acta Materiae Compositae Sinica, 2023, 40(5): 2938-2950. doi: 10.13801/j.cnki.fhclxb.20220804.004

BFRP筋钢-混组合梁高温后力学性能试验

doi: 10.13801/j.cnki.fhclxb.20220804.004
基金项目: 中央高校基本科研业务费(300102212212);陕西省自然科学基础研究计划重点项目(2022 JZ-32)
详细信息
    通讯作者:

    武芳文,工学博士,副教授,博士生导师,研究方向为钢-混凝土组合结构理论与应用 E-mail: wufangwen@chd.edu.cn

  • 中图分类号: TB332;U441.4

Mechanical properties experiment of steel-concrete composite beams reinforced with BFRP bars after high temperature

Funds: Fundamental Research Funds for the Central Universities, CHD (300102212212); Natural Science Basic Research Program of Shaanxi (2022 JZ-32)
  • 摘要: 设计了常温(25℃)、200℃、400℃和600℃四个工况,通过模型试验方法探究了玄武岩纤维增强树脂复合材料(Basalt fiber reinforced polymer,BFRP)筋钢-混组合梁高温后的破坏形态和力学性能。通过分析试验梁裂缝开展、挠度变形、温度场和破坏过程规律,研究BFRP筋和普通钢筋钢-混组合梁的破坏模式和承载能力。结果表明:经历400℃高温后,BFRP筋劣化导致力学性能大幅降低;筋体膨胀导致混凝土板开裂,其裂缝开展与普通钢筋钢-混组合梁显著不同,主裂缝沿横向筋材规律开展,且裂缝较宽。温度低于400℃时,由于混凝土的包裹,BFRP筋未达到劣化温度,两种钢-混组合梁承载能力和外观差别较小;600℃后,BFRP筋劣化,削弱了混凝土板刚度和强度,导致BFRP筋钢-混组合梁承载能力比普通钢筋钢-混组合梁降低更多;BFRP筋钢-混组合梁因整体刚度较小,加载后变形更大。高温后两种钢-混组合梁破坏模式相似,均为剪切破坏,有明显弹性、弹塑性和破坏阶段;600℃时,两种钢-混组合梁延性大幅降低,塑性变形减少,破坏较为突然。研究成果可为BFRP筋在钢-混组合梁中的应用提供参考。

     

  • 图  1  试验梁尺寸

    Figure  1.  Test beam size

    图  2  高温试验

    Figure  2.  High temperature test

    图  3  变形测点布置

    Figure  3.  Layout of deformation measuring points

    图  4  高温炉升温曲线

    Figure  4.  Heating curves of furnace

    图  5  热电偶布置

    Figure  5.  Thermocouple arrangement

    图  6  加载装置图

    Figure  6.  Loading scheme

    图  7  高温后的玄武岩纤维增强树脂复合材料(BFRP)筋

    Figure  7.  Basalt fiber reinforced polymer (BFRP) bars after high temperature

    图  8  材料力学性能试验

    Figure  8.  Material mechanical properties test

    图  9  高温后各材料力学性能

    Figure  9.  Mechanical properties of materials after high temperature

    ftu—Ultimate tensile strength of steel; fy—Yield strength of steel; fcu—Ultimate compressive strength of concrete cube

    图  10  高温后钢-混组合梁外观

    Figure  10.  Appearance of steel-concrete composite beams after high temperature

    图  11  600℃时温度沿钢-混组合梁梁长的变化

    Figure  11.  Temperature changes along beam length of steel-concrete composite beam at 600℃

    h—Distance from the bottom of the beam

    图  12  温度沿钢-混组合梁梁高的变化

    Figure  12.  Temperature change along the height of steel-concrete composite beam

    T—Furnace temperature

    图  13  钢-混组合梁混凝土板升温曲线

    Figure  13.  Heating curves of steel-concrete composite beam concrete slab

    图  14  钢-混组合梁破坏图

    Figure  14.  Failure diagram of steel-concrete composite beams

    图  15  钢-混组合梁荷载-挠度曲线

    Figure  15.  Load-deflection curves of steel-concrete composite beams

    图  16  钢-混组合梁跨中截面应变分布

    Figure  16.  Strain distribution at mid-span section of steel-concrete composite beams

    表  1  C50混凝土配合比

    Table  1.   C50 concrete mix proportion kg/m3

    CementMineral finesSandCrushed stoneWaterWater reducer
    335.283.265511161708.1
    下载: 导出CSV

    表  2  钢-混组合梁设计参数

    Table  2.   Design parameters of steel-concrete composite beams

    NumberMaterial compositionTest temperature/℃
    S-SCB-25C50+HRB400 25
    S-SCB-200C50+HRB400200
    S-SCB-400C50+HRB400400
    S-SCB-600C50+HRB400600
    BFRP-SCB-25C50+BFRP bars 25
    BFRP-SCB-200C50+BFRP bars200
    BFRP-SCB-400C50+BFRP bars400
    BFRP-SCB-600C50+BFRP bars600
    Notes: S, BFRP—Type of reinforcement; SCB—Steel-concrete composite beam; Figure—Test temperature; such as BFRP-SCB-200—Steel-concrete composite beam with BFRP bars at 200℃.
    下载: 导出CSV

    表  3  钢-混组合梁残余承载能力

    Table  3.   Residual bearing capacity of steel-concrete composite beams

    Test beamPu (25℃)/kNPu (200℃)/kNPu (400℃)/kNPu (600℃)/kN
    S-SCB512.8476.2439.1390.0
    BFRP-SCB506.3465.9441.1332.7
    Note: Pu—Ultimate bearing capacity.
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-05-10
  • 修回日期:  2022-07-18
  • 录用日期:  2022-07-20
  • 网络出版日期:  2022-08-05
  • 刊出日期:  2023-05-15

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