爆炸荷载在圆截面桥梁墩柱上的分布规律

彭玉林 吴昊 方秦

彭玉林, 吴昊, 方秦. 爆炸荷载在圆截面桥梁墩柱上的分布规律[J]. 爆炸与冲击, 2019, 39(12): 122201. doi: 10.11883/bzycj-2018-0317
引用本文: 彭玉林, 吴昊, 方秦. 爆炸荷载在圆截面桥梁墩柱上的分布规律[J]. 爆炸与冲击, 2019, 39(12): 122201. doi: 10.11883/bzycj-2018-0317
PENG Yulin, WU Hao, FANG Qin. Blast loading distributions on the circular sectional bridge columns[J]. Explosion And Shock Waves, 2019, 39(12): 122201. doi: 10.11883/bzycj-2018-0317
Citation: PENG Yulin, WU Hao, FANG Qin. Blast loading distributions on the circular sectional bridge columns[J]. Explosion And Shock Waves, 2019, 39(12): 122201. doi: 10.11883/bzycj-2018-0317

爆炸荷载在圆截面桥梁墩柱上的分布规律

doi: 10.11883/bzycj-2018-0317
基金项目: 国家自然科学基金(51522813)
详细信息
    作者简介:

    彭玉林(1995- ),男,硕士研究生,happyasam@163.com

    通讯作者:

    吴 昊(1981- ),男,博士,教授,博导,abrahamhao@126.com

  • 中图分类号: O383

Blast loading distributions on the circular sectional bridge columns

  • 摘要: 墩柱是桥梁结构的主要承载构件,研究爆炸荷载在墩柱上的分布规律是分析爆炸荷载作用下桥梁结构动态响应的前提。以圆截面桥梁墩柱为研究对象,基于LS-DYNA软件建立了桥梁墩柱的有限元模型,综合考虑炸药当量、爆心高度、爆炸距离和墩柱直径等影响因素,基于数值模拟得到爆心高度低于0.3倍墩柱高度,比例距离为0.5~2.1 m/kg1/3和墩柱直径为0.15~1 m时,爆炸荷载冲量沿墩柱高度和横截面方向上的分布。结果表明:沿墩柱高度方向,地面爆炸或爆心高度为0.1倍柱高时,墩柱前表面冲量近似“单线性”分布,当爆心高度距地面0.2和0.3倍柱高时,墩柱前表面冲量近似“双线性”分布;沿横截面方向的平均净冲量与其前表面冲量之比为常数。基于上述爆炸荷载冲量分布规律,进一步提出了爆炸荷载作用在桥梁墩柱上总净冲量的计算方法,从而为桥梁墩柱抗爆响应分析与设计提供一定的理论基础。
  • 图  1  爆炸荷载作用下倒塌的桥梁[2-3]

    Figure  1.  Collapse of bridges under blast loading[2-3]

    图  2  SC-1墩柱爆炸试验布置[20]

    Figure  2.  SC-1 bridge column blast test setup[20]

    图  3  有限元模型

    Figure  3.  Finite element model

    图  4  爆炸冲击波传播云图

    Figure  4.  Blast wave propagation contour

    图  5  各测点反射超压时程曲线的试验和数值模拟结果对比

    Figure  5.  Comparisons of the experimental and numerical simulated reflected overpressure time-history for each gauge

    图  6  数值模拟中墩柱表面测点分布[10, 15]

    Figure  6.  Gauging points in numerical simulation[10, 15]

    图  7  不同爆心高度时爆炸荷载冲量沿墩柱高度和横截面方向的分布(Z=1.1 m/kg1/3)

    Figure  7.  Blast loading impulse distributions along column height and cross-section directions for different heights of burst (Z=1.1 m/kg1/3)

    图  8  柱前表面冲量分布的简化模型

    Figure  8.  Simplified models for blast loading impulse distributions on the column front surface

    图  9  不同比例距离下的柱前表面冲量(hb/Hm=0)

    Figure  9.  Blast loading impulses on the column front surface for different scaled distances (hb/Hm=0)

    图  10  不同比例距离下的柱前表面冲量(hb/Hm=0.1)

    Figure  10.  Blast loading impulses on the column front surface for different scaled distances (hb/Hm=0.1)

    图  11  不同比例距离下的柱前表面冲量(hb/Hm=0.2)

    Figure  11.  Blast loading impulses on the column front surface for different scaled distances (hb/Hm=0.2)

    图  12  不同比例距离下的柱前表面冲量(hb/Hm=0.3)

    Figure  12.  Blast loading impulses on the column front surface for different scaled distances (hb/Hm=0.3)

    图  13  αZD的变化曲线

    Figure  13.  Variation of α with Z and D

    图  14  净冲量的一般计算流程

    Figure  14.  General calculation process of the net impulse

    表  1  刚体材料模型参数

    Table  1.   Parameters for rigid material model

    ρ/(kg·m−3)E/GPav
    3×1032100.3
     注:ρ为密度;E为弹性模量;v为泊松比。
    下载: 导出CSV

    表  2  空气材料模型及状态方程参数

    Table  2.   Parameters for air material model and equation of state

    ρ/(kg·m−3)c0c1c2c3c4c5c6E0/(J·m−3)
    1.2900000.40.400.25
     注:ρ 为密度;E 为弹性模量。
    下载: 导出CSV

    表  3  TNT炸药材料模型及状态方程参数

    Table  3.   Parameters for TNT material model and equation of state

    ρ/(kg·m−3)D/(m·s−1)pCJ/GPaA/GPaB/GPaR1R2ωE0 /(MJ·m−3)V
    1.63×1036.93×103213713.234.150.950.371
     注:为密度;D 为爆轰速度;pCJ 为C-J爆压。
    下载: 导出CSV
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出版历程
  • 收稿日期:  2018-08-27
  • 修回日期:  2018-11-27
  • 网络出版日期:  2019-09-25
  • 刊出日期:  2019-12-01

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