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基于解析方法的FRP增強混凝土梁失穩前斷裂過程分析

劉決丁 范向前 葉宇霄 葛菲

劉決丁, 范向前, 葉宇霄, 葛菲. 基于解析方法的FRP增強混凝土梁失穩前斷裂過程分析[J]. 工程力學, 2023, 40(10): 129-140. doi: 10.6052/j.issn.1000-4750.2022.01.0081
引用本文: 劉決丁, 范向前, 葉宇霄, 葛菲. 基于解析方法的FRP增強混凝土梁失穩前斷裂過程分析[J]. 工程力學, 2023, 40(10): 129-140. doi: 10.6052/j.issn.1000-4750.2022.01.0081
LIU Jue-ding, FAN Xiang-qian, YE Yu-xiao, GE Fei. FRACTURE PROCESS ANALYSIS OF FRP REINFORCED CONCRETE BEAMS BEFORE INSTABILITY BASED ON ANALYTICAL METHOD[J]. Engineering Mechanics, 2023, 40(10): 129-140. doi: 10.6052/j.issn.1000-4750.2022.01.0081
Citation: LIU Jue-ding, FAN Xiang-qian, YE Yu-xiao, GE Fei. FRACTURE PROCESS ANALYSIS OF FRP REINFORCED CONCRETE BEAMS BEFORE INSTABILITY BASED ON ANALYTICAL METHOD[J]. Engineering Mechanics, 2023, 40(10): 129-140. doi: 10.6052/j.issn.1000-4750.2022.01.0081

基于解析方法的FRP增強混凝土梁失穩前斷裂過程分析

doi: 10.6052/j.issn.1000-4750.2022.01.0081
基金項目: 國家自然科學基金項目(52171270,51879168);黃河水科學研究聯合基金項目(U2243223)
詳細信息
    作者簡介:

    劉決丁(1994?),男,安徽桐城人,博士生,主要從事混凝土斷裂力學研究(E-mail: liujd2020@163.com)

    葉宇霄(1992?),男,江西九江人,博士生,主要從事混凝土斷裂力學研究(E-mail: yeyuxiao1992@163.com)

    葛 菲(1999?),女,江蘇南通人,碩士生,主要從事混凝土斷裂力學研究(E-mail: gfe991123@163.com)

    通訊作者:

    范向前(1982?),男,河南登封人,正高工,博士,碩導,主要從事水工混凝土開裂與控制研究(E-mail: xqfan@nhri.cn)

  • 中圖分類號: TU528

FRACTURE PROCESS ANALYSIS OF FRP REINFORCED CONCRETE BEAMS BEFORE INSTABILITY BASED ON ANALYTICAL METHOD

  • 摘要: 為研究FRP增強混凝土梁失穩前斷裂過程,該文基于混凝土斷裂力學理論和非線性FRP-混凝土界面粘結滑移規律,建立了一個跨中裂縫導致界面脫粘的粘聚區模型,采用解析方法推導了FRP增強混凝土梁界面剪切應力、FRP拉應力以及失穩前斷裂韌度的公式,為分析FRP-混凝土界面脫粘提供了一種有效的方法,并開展了動態荷載下4種不同初始縫高比(0.2、0.3、0.4和0.5)的FRP增強混凝土梁三點彎曲試驗。結果表明,FRP增強混凝土梁的起裂荷載和阻裂荷載隨著初始縫高比的增大而逐漸減小,但初始縫高比為0.4時,試件起裂最晚;起裂韌度和阻裂韌度不隨初始縫高比的變化而變化,表現出與其他文獻類似的規律,驗證了斷裂韌度解析解的正確性。
  • 圖  1  FRP增強混凝土梁模型示意圖

    Figure  1.  Schematic diagram of FRP reinforced concrete beam model

    圖  2  FRP增強混凝土梁1/2模型分析圖

    Figure  2.  1/2 model analysis diagram of FRP reinforced concrete beam

    圖  3  FRP增強混凝土梁界面微單元示意圖

    Figure  3.  Schematic diagram of interface micro-unit of FRP reinforced concrete beam

    圖  4  雙線性粘結滑移模型

    Figure  4.  Bilinear bond slip model

    圖  5  FRP-混凝土界面線彈性階段

    Figure  5.  Linear elastic phase of FRP-concrete interface

    圖  6  FRP-混凝土界面彈性-軟化階段

    Figure  6.  Elastic-softening phase of FRP-concrete interface

    圖  7  無限長等寬跨中帶裂縫模型

    Figure  7.  Crack model for infinite length and equal width

    圖  8  試驗加載裝置

    Figure  8.  Test loading device

    圖  9  P-CMOD曲線

    Figure  9.  P-CMOD curves

    圖  10  斷裂韌度隨初始縫高比的變化

    Figure  10.  Variation of fracture toughness with initial crack-depth ratio

    表  1  試驗數據表

    Table  1.   Experimental data sheet

    試件起裂荷載/kN阻裂荷載/kN起裂荷載/阻裂荷載
    FRP-0.2-12.55016.10450.4177
    FRP-0.2-22.79956.86990.4075
    FRP-0.2-32.50266.35960.3935
    平均值2.61746.44470.4061
    FRP-0.3-11.88724.73190.3988
    FRP-0.3-22.21095.10210.4333
    FRP-0.3-31.81384.91850.3688
    平均值1.97064.91750.4007
    FRP-0.4-11.57233.51470.4473
    FRP-0.4-21.82613.51770.5191
    FRP-0.4-21.65323.52210.4694
    平均值1.68383.51820.4786
    FRP-0.5-11.11032.78070.3993
    FRP-0.5-21.11323.01920.3687
    FRP-0.5-31.04152.80660.3711
    平均值1.08832.86880.3794
    下載: 導出CSV

    黑人大屌丝逼逼
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  • 收稿日期:  2022-01-17
  • 修回日期:  2022-05-16
  • 錄用日期:  2022-06-24
  • 網絡出版日期:  2022-06-24
  • 刊出日期:  2023-10-10

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