低速冲击下混凝土少筋梁断裂性能

宋敏 张杰 陈青青 王志勇 王志华

宋敏, 张杰, 陈青青, 王志勇, 王志华. 低速冲击下混凝土少筋梁断裂性能[J]. 爆炸与冲击, 2021, 41(6): 063102. doi: 10.11883/bzycj-2020-0121
引用本文: 宋敏, 张杰, 陈青青, 王志勇, 王志华. 低速冲击下混凝土少筋梁断裂性能[J]. 爆炸与冲击, 2021, 41(6): 063102. doi: 10.11883/bzycj-2020-0121
SONG Min, ZHANG Jie, CHEN Qingqing, WANG Zhiyong, WANG Zhihua. Fracture behaviors of lightly reinforced concrete beams under different loading rates[J]. Explosion And Shock Waves, 2021, 41(6): 063102. doi: 10.11883/bzycj-2020-0121
Citation: SONG Min, ZHANG Jie, CHEN Qingqing, WANG Zhiyong, WANG Zhihua. Fracture behaviors of lightly reinforced concrete beams under different loading rates[J]. Explosion And Shock Waves, 2021, 41(6): 063102. doi: 10.11883/bzycj-2020-0121

低速冲击下混凝土少筋梁断裂性能

doi: 10.11883/bzycj-2020-0121
基金项目: 国家自然科学基金(11702186;11390362);青海省科技计划项目(2017-ZJ-783)
详细信息
    作者简介:

    宋 敏(1991- ),男,博士研究生,songmin595@163.com

    通讯作者:

    王志华(1977- ),男,博士,教授,wangzh077@163.com

  • 中图分类号: O383

Fracture behaviors of lightly reinforced concrete beams under different loading rates

  • 摘要: 动态加载下,混凝土中钢筋的阻裂性能一直是冲击动力学研究领域的难点之一。利用落锤试验机对含缺口的混凝土少筋梁进行三点弯曲试验,分析了不同加载速率下梁的冲击力、跨中挠度、混凝土起裂应变率和钢筋应变。实验结果表明:在一定加载速率范围内(0.885~1.252 m/s),混凝土预制裂缝尖端的裂纹起裂应变率、冲击力最大值、跨中挠度峰值与加载速率呈线性增长关系,当加载速率增至1.771 m/s时,增长趋势减弱;冲击力卸载时,钢筋部分弹性变形恢复导致裂纹产生闭合,裂纹嘴张开位移逐渐减小至恒定值,对裂纹嘴张开位移峰值前的部分曲线进行拟合后得到裂纹嘴张开位移率,结果表明裂纹嘴张开位移率随加载速率的提高而线性增大。
  • 图  1  试件设计

    Figure  1.  Specimen design

    图  2  落锤加载装置

    Figure  2.  Drop hammer equipment

    图  3  梁跨中截面应力

    Figure  3.  The section stress at mid-span of beam

    图  4  混凝土切口根部应变时程曲线

    Figure  4.  Typical strain-time curves of concrete at the notch root

    图  5  加载速率和裂纹起裂应变率的关系

    Figure  5.  Relationship between crack initiation strain rate and loading rates

    图  6  不同加载速率下的裂纹扩展

    Figure  6.  Crack propagation of concrete beams under different loading rates

    图  7  不同加载速率下冲击力时程曲线

    Figure  7.  Impact force versus loading rates

    图  8  不同加载速率下跨中挠度时程曲线

    Figure  8.  Mid-span deflection versus loading rates

    图  9  冲击力峰值、跨中挠度最大值与加载速率的关系

    Figure  9.  Peak load and maximum of mid-span deflection versus loading rates

    图  10  不同加载速率下冲击力、跨中挠度和钢筋应变时程曲线

    Figure  10.  Impact force, mid-span deflection and steel strain versus time under different loading rates

    图  11  水平位移场

    Figure  11.  Horizontal displacement field in DIC

    图  12  不同加载速率下裂纹嘴张开位移及其变化率

    Figure  12.  Crack mouth opening displacement and its changing rate at different loading rates

    图  13  不同加载速率下裂纹扩展

    Figure  13.  Final cracks under different loading rates

    表  1  裂纹起裂应变率试验结果

    Table  1.   Crack initiation strain rate versus loading rates

    v/(m·s−1${\dot \varepsilon _{{\rm{ini}}}}$/s−1${\dot \varepsilon _{{\rm{ini}}}}$平均值/s−1$\Delta {\dot \varepsilon _{{\rm{ini}}}}/\Delta v$
    0.8850.2330.255
    0.276
    1.0840.6320.6552.010
    0.678
    1.2520.9570.9621.827
    1.023
    0.906
    1.7711.3531.3540.755
    1.403
    1.307
    下载: 导出CSV

    表  2  实验结果

    Table  2.   Experimental results

    加载速率/(m·s−1)冲击力跨中挠度钢筋应变
    峰值/kN峰值时刻/ms峰值/mm峰值时刻/ms峰值/10−6峰值时刻/ms
    0.885 59.390.331.2523.0 92.490.33
    1.084 85.480.291.85 3.41489.270.54
    1.252130.160.142.53 4.03773.430.69
    1.771154.680.123.29 4.44473.320.71
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-04-24
  • 修回日期:  2020-10-29
  • 网络出版日期:  2021-06-01
  • 刊出日期:  2021-06-05

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