钢纤维增强多孔混凝土板水下接触爆炸防爆机理及损伤等级预测

汤长兴 曹克磊 赵瑜 张建伟 黄锦林 吕孟杰

汤长兴, 曹克磊, 赵瑜, 张建伟, 黄锦林, 吕孟杰. 钢纤维增强多孔混凝土板水下接触爆炸防爆机理及损伤等级预测[J]. 爆炸与冲击. doi: 10.11883/bzycj-2024-0239
引用本文: 汤长兴, 曹克磊, 赵瑜, 张建伟, 黄锦林, 吕孟杰. 钢纤维增强多孔混凝土板水下接触爆炸防爆机理及损伤等级预测[J]. 爆炸与冲击. doi: 10.11883/bzycj-2024-0239
TANG Changxing, CAO Kelei, ZHAO Yu, ZHANG Jianwei, HUANG Jinlin, LYU Mengjie. Study on explosion-proof mechanism and damage level prediction of steel fiber reinforced cellular concrete slab in underwater contact explosion[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2024-0239
Citation: TANG Changxing, CAO Kelei, ZHAO Yu, ZHANG Jianwei, HUANG Jinlin, LYU Mengjie. Study on explosion-proof mechanism and damage level prediction of steel fiber reinforced cellular concrete slab in underwater contact explosion[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2024-0239

钢纤维增强多孔混凝土板水下接触爆炸防爆机理及损伤等级预测

doi: 10.11883/bzycj-2024-0239
基金项目: 国家自然科学基金(51779168);河南省高等学校重点科研项目(24A570002);天津大学水利工程智能建设与运维全国重点实验室开放基金(HESS-2230)
详细信息
    作者简介:

    汤长兴(1999- ),男,硕士研究生,tangchangxing2023@163.com

    通讯作者:

    曹克磊(1990- ),男,博士,讲师,caokelei456@163.com

  • 中图分类号: O383; TJ55

Study on explosion-proof mechanism and damage level prediction of steel fiber reinforced cellular concrete slab in underwater contact explosion

  • 摘要: 为探究钢纤维增强多孔混凝土材料的水下抗爆防护效果,采用光滑粒子流体动力学与有限元耦合方法建立了“水体-炸药-防护层-钢筋混凝土板”的三维精细化仿真模型,研究了不同纤维配比钢纤维增强多孔混凝土防护层(SAP10S5、SAP10S10、SAP10S15和SAP10S20)和不同炸药质量影响下被防护钢筋混凝土板的损伤演化过程、破坏模式及失效机理,并构建了钢筋混凝土板的损伤等级预测曲线。研究结果表明:水下接触爆炸荷载下,增设钢纤维增强多孔混凝土防护层能够有效降低被防护钢筋混凝土(reinforced concrete,RC)板的损伤程度,且其对RC板损伤程度的影响随防护层中钢纤维体积分数的增加呈先减小后增大的规律,其中SAP10S15配比防护层的抗爆防护效果最优;炸药量在一定范围内增大时,SAP10S15配比防护层依然能维持较高的耗能占比,有效降低RC板的损伤程度;当炸药量为0.25 kg时,相较于无防护方案,SAP10S15配比防护层加固下RC板的损伤指数衰减最明显,为42.5%,损伤等级由严重破坏降为中度破坏。构建的损伤等级预测曲线能够直观评估钢纤维体积分数和炸药量对RC板损伤等级的影响。
  • 图  1  水下接触爆炸试验及钢筋布置

    Figure  1.  Underwater contact explosion experiment and reinforcement arrangement

    图  2  水下接触爆炸下钢筋混凝土板的数值模型

    Figure  2.  Numerical model of reinforced concrete slab subjected to underwater contact explosion

    图  3  水下接触爆炸荷载作用下混凝土板损伤破坏形态的试验与数值模拟结果对比

    Figure  3.  Comparison of experimental and numerical simulation results of damage and failure modes of concrete slabs under underwater contact explosion load

    图  4  炸药-水体-防护层-混凝土板的防爆模型

    Figure  4.  Explosion-proof model of explosive-water-protective layer-concrete slab

    图  5  钢筋混凝土板的损伤演化过程

    Figure  5.  Damage evolution in reinforced concrete slabs

    图  6  钢纤维增强多孔混凝土的结构毁伤机理

    Figure  6.  Structural damage mechanism of steel fiber reinforced cellular concrete

    图  7  无防护层RC板的破坏模式

    Figure  7.  Damage patterns of RC panels without protective layers

    图  8  RC板的破坏模式

    Figure  8.  Damage patterns of RC panels

    图  9  失效体积率

    Figure  9.  Failure volume rate

    图  10  耗能分担率

    Figure  10.  Energy consumption sharing ratio

    图  11  损伤指数

    Figure  11.  Damage index

    图  12  RC板损伤等级与防护层配比、炸药量关系的预测曲线

    Figure  12.  Prediction curves of RC plate damage level in relation to protective layer ratio and explosive volume

    图  13  由经验公式求得的拟合曲面

    Figure  13.  The fitted surface derived from the empirical formula

    图  14  仿真结果与经验公式拟合结果的关系

    Figure  14.  Relationship between simulation results and empirical formula fitting results

    表  1  炸药的材料参数

    Table  1.   Material parameters of explosive

    ρ/(kg·m−3) A/GPa B/GPa R1 R2 ω1 Etnt/(GJ·m−3)
    1650 373.77 3.75 4.15 0.9 0.35 8
    下载: 导出CSV

    表  2  水体的材料参数

    Table  2.   Material parameters of water

    ρ/(kg·m−3) C/(m·s−1) S1 S2 S3 γ0 α
    1000 1647 1.921 −0.096 0 1 0
    下载: 导出CSV

    表  3  不同配比钢纤维增强多孔混凝土的改进K&C模型参数

    Table  3.   Improved K&C model parameters for steel fibers cellular concrete reinforced in different ratios

    防护方案配比 ρ/(g·cm−3) fc/MPa ν b1 b2 b3 a0/MPa
    SAP10S5 2.189 34.46 0.19 1.6 1.96 1.15 8.22
    SAP10S10 2.232 39.35 0.19 1.6 2.04 1.15 9.18
    SAP10S15 2.270 42.86 0.19 1.6 2.09 1.15 10.03
    SAP10S20 2.307 41.04 0.19 1.6 2.06 1.15 9.63
    防护方案配比 a1 a2/GPa−1 a0y/MPa a1y a2y/GPa−1 a1f a2f/GPa−1
    SAP10S5 0.38 4.26 6.80 0.53 12.91 0.38 6.23
    SAP10S10 0.38 3.77 7.66 0.53 11.45 0.38 5.52
    SAP10S15 0.38 3.46 8.36 0.53 10.49 0.38 5.06
    SAP10S20 0.38 3.61 8.02 0.53 10.94 0.38 5.28
    下载: 导出CSV

    表  4  防护方案设计

    Table  4.   Protection program design

    工况 炸药质量/kg 防护层板厚/mm 防护方案配比 RC板厚/mm
    1 0.250 100 SAP10S5 150
    2 0.250 100 SAP10S10
    3 0.250 100 SAP10S15
    4 0.250 100 SAP10S20
    5 0.375 100 SAP10S15
    6 0.500 100 SAP10S15
    7 0.625 100 SAP10S15
    8 0.750 100 SAP10S15
    下载: 导出CSV
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  • 收稿日期:  2024-07-16
  • 修回日期:  2024-09-05
  • 网络出版日期:  2024-09-06

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