起波配筋RC梁抗爆作用机理及抗力动力系数的理论计算方法

樊源 陈力 任辉启 冯鹏 方秦

樊源, 陈力, 任辉启, 冯鹏, 方秦. 起波配筋RC梁抗爆作用机理及抗力动力系数的理论计算方法[J]. 爆炸与冲击, 2019, 39(3): 035102. doi: 10.11883/bzycj-2018-0181
引用本文: 樊源, 陈力, 任辉启, 冯鹏, 方秦. 起波配筋RC梁抗爆作用机理及抗力动力系数的理论计算方法[J]. 爆炸与冲击, 2019, 39(3): 035102. doi: 10.11883/bzycj-2018-0181
FAN Yuan, CHEN Li, REN Huiqi, FENG Peng, FANG Qin. Blast-resistant mechanism of RC beam with kinked rebar and calculation method of dynamic resistance coefficient[J]. Explosion And Shock Waves, 2019, 39(3): 035102. doi: 10.11883/bzycj-2018-0181
Citation: FAN Yuan, CHEN Li, REN Huiqi, FENG Peng, FANG Qin. Blast-resistant mechanism of RC beam with kinked rebar and calculation method of dynamic resistance coefficient[J]. Explosion And Shock Waves, 2019, 39(3): 035102. doi: 10.11883/bzycj-2018-0181

起波配筋RC梁抗爆作用机理及抗力动力系数的理论计算方法

doi: 10.11883/bzycj-2018-0181
基金项目: 国家自然科学基金(51622812, 51427807);中国博士后科学基金(2017M613379)
详细信息
    作者简介:

    樊 源(1994- ),男,硕士研究生,fanyuan0@foxmail.com

    通讯作者:

    陈 力(1982- ),男,博士,教授,博导,chenli1360@qq.com

  • 中图分类号: O383.2

Blast-resistant mechanism of RC beam with kinked rebar and calculation method of dynamic resistance coefficient

  • 摘要:

    针对钢筋混凝土(RC)梁,提出了一种通过对抗拉纵筋进行局部弯折,形成钢筋起波,从而提高RC梁抗爆能力的高效新方法。结合已有的实验结果和有限元模型计算,分析了起波配筋RC梁的受荷破坏全过程,揭示了其抗爆作用机理。分析结果表明,在RC梁底部适当位置设置纵筋起波,能增大RC梁在爆炸荷载作用下的允许变形,有效吸收爆炸能量,大幅度提高RC梁的抗爆性能。基于能量法,建立了起波配筋RC梁在爆炸荷载作用下的理论计算模型,给出了抗力动力系数的显示计算公式;讨论了平屈抗力比、平弹变形比以及屈弹变形比3个关键设计参数对起波配筋RC梁抗爆性能的影响规律,以便为进一步工程应用提供理论依据。

  • 图  1  普通平直钢筋和起波钢筋

    Figure  1.  Kinked rebar compared with traditional rebar

    图  2  配起波纵筋RC梁的荷载-挠度曲线

    Figure  2.  Load-deflection curve of the RC beam with local kinked rebar

    图  3  起波钢筋准静态拉伸实验

    Figure  3.  Stretching test of the kinked rebar specimen

    图  4  起波钢筋等效应力应变关系

    Figure  4.  Equivalent stress- strain curves

    图  5  起波配筋梁的受力及破坏过程示意图

    Figure  5.  Failure process of the RC beam with local kinked rebar

    图  6  起波配筋梁简化抗力曲线

    Figure  6.  Theoretical load-deflection curve of the RC beam with local kinked rebar

    图  7  起波配筋梁模型及有限元计算结果

    Figure  7.  Model of RC beam with local kinked rebars and FEM results

    图  8  RC梁有限元计算模型(单位: mm)

    Figure  8.  FE model of RC beam (unit: mm)

    图  9  等效塑性应变云图

    Figure  9.  Equivalent plastic strain

    图  10  跨中钢筋应变与跨中挠度的关系

    Figure  10.  Relation between mid-span deflection and steel strain

    图  11  总吸能与跨中钢筋应变的关系

    Figure  11.  Total absorbed energy vs. steel strain

    图  12  理想弹塑性等效单自由度体系

    Figure  12.  Elastic-perfectly plastic SDOF system

    图  13  突加平台形荷载

    Figure  13.  Platform load

    图  14  瞬息冲量荷载

    Figure  14.  Instantaneous load

    图  15  三角形衰减荷载

    Figure  15.  Triangular declining load

    图  16  爆炸荷载作用下起波配筋梁动态响应

    Figure  16.  Dynamic response for RC beams with local kinked rebar under the blast load

    图  17  刚度比κe,p的拟合结果

    Figure  17.  Fitting results of κe,p

    图  18  平台形荷载作用下起波配筋RC梁的抗力动力系数

    Figure  18.  Dynamic resistance coefficent of RC beams with kinked rebars under platform load

    图  19  瞬息冲量荷载作用下起波配筋RC梁的抗力动力系数

    Figure  19.  Dynamic resistance coefficent of RC beams with kinked rebars under instantaneous load

    表  1  起波配筋RC梁参数

    Table  1.   Parameters of the RC beam with local kinked rebar

    混凝土强度/MPa纵筋屈服强度/MPa纵筋极限强度/MPa箍筋屈服强度/MPa箍筋极限强度/MPa跨长/m梁宽/m梁高/m
    43.4441.1686.2338.1470.12.70.20.3
    下载: 导出CSV

    表  2  $ {\bar K_{1,2}}$Ψ1,eΨ2,eκe,p的主要影响因素

    Table  2.   Major factors of ${\bar K_{1,2}}$, Ψ1,e, Ψ2,e, κe,p

    参数主要影响因素
    $\scriptstyle {\bar K_{1,2}}$钢筋在RC梁中的起波位置
    Ψ1,e钢筋的起波矢高、起波角度
    Ψ2,e钢筋的伸长率,RC梁的配筋率
    κe,p钢筋的强度、起波角度、起波矢高,RC梁的截面高度
    下载: 导出CSV

    表  3  算例参数范围

    Table  3.   Parameter scope for theoretical analysis

    参数$\scriptstyle{\bar K_{1,2}}$Ψ1,eΨ2,e
    范围0, 0.5, 0.9[0,7][0,10]
    下载: 导出CSV
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出版历程
  • 收稿日期:  2018-05-28
  • 修回日期:  2018-07-26
  • 网络出版日期:  2018-07-25
  • 刊出日期:  2019-03-01

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