冲击荷载下钢筋混凝土梁的性能及损伤评估

赵武超 钱江 张文娜

赵武超, 钱江, 张文娜. 冲击荷载下钢筋混凝土梁的性能及损伤评估[J]. 爆炸与冲击, 2019, 39(1): 015102. doi: 10.11883/bzycj-2017-0288
引用本文: 赵武超, 钱江, 张文娜. 冲击荷载下钢筋混凝土梁的性能及损伤评估[J]. 爆炸与冲击, 2019, 39(1): 015102. doi: 10.11883/bzycj-2017-0288
ZHAO Wuchao, QIAN Jiang, ZHANG Wenna. Performance and damage evaluation of RC beams under impact loading[J]. Explosion And Shock Waves, 2019, 39(1): 015102. doi: 10.11883/bzycj-2017-0288
Citation: ZHAO Wuchao, QIAN Jiang, ZHANG Wenna. Performance and damage evaluation of RC beams under impact loading[J]. Explosion And Shock Waves, 2019, 39(1): 015102. doi: 10.11883/bzycj-2017-0288

冲击荷载下钢筋混凝土梁的性能及损伤评估

doi: 10.11883/bzycj-2017-0288
基金项目: 

国家自然科学基金 51438010

详细信息
    作者简介:

    赵武超(1992-), 男, 博士研究生

    通讯作者:

    钱江, jqian@tongji.edu.cn

  • 中图分类号: O342

Performance and damage evaluation of RC beams under impact loading

  • 摘要: 基于落锤冲击试验,通过数值模拟研究钢筋混凝土梁在冲击荷载下的抗冲击性能和损伤机理。针对冲击荷载局部效应明显和持时短暂等特点,提出基于截面损伤因子的损伤评估方法;采用参数分析方法研究了箍筋间距、边界条件、冲头形状和面积以及冲击位置对钢筋混凝土梁的动态响应和损伤程度的影响。结果表明:基于截面的损伤评估方法能够比较直观地描述梁体损伤沿长度方向的分布;端部的固支约束可以有效地改变钢筋混凝土梁的耗能机制,并能提高梁的抗冲击承载潜力;冲击位置会直接影响梁体的裂缝分布和破坏模式;碰撞接触面积和冲头形状也对梁的损伤分布具有一定的影响。
  • 图  1  落锤冲击试验装置

    Figure  1.  Drop hammer impact test setup

    图  2  梁截面尺寸及钢筋分布(单位:mm)

    Figure  2.  Beam geometry with rebar arrangment(mm in unit)

    图  3  冲击试验有限元模型

    Figure  3.  Finite element model of impact test

    图  4  连续帽盖模型屈服面形状[9]

    Figure  4.  Shape of continuous surface cap model yield surface[9]

    图  5  不同冲击高度时RC梁的裂缝分布对比

    Figure  5.  Comparison of RC cracking patterns at different impact heights

    图  6  不同冲击高度下碰撞力和跨中挠度时程曲线对比

    Figure  6.  Comparison of impact force and midspan deflection at different impact heights

    图  7  冲击高度为1.2 m时RC梁截面损伤状态

    Figure  7.  Damage of RC beam section at drop height of 1.2 m

    图  8  不同碰撞时刻RC梁截面损伤因子

    Figure  8.  Sectional damage factors of RC beams at different impact time

    图  9  不同冲击高度时RC梁截面损伤因子

    Figure  9.  Sectional damage factors of RC beamsat different drop heights

    图  10  跨中挠度时程曲线

    Figure  10.  Midspan deflection time histories

    图  11  不同网格尺寸时截面损伤因子

    Figure  11.  Sectional damage factors for different mesh sizes

    图  12  不同箍筋间距下RC梁的动态损伤

    Figure  12.  Dynamic damage of RC beams at different spacings of stirrups

    图  13  不同箍筋间距下RC梁的截面损伤因子

    Figure  13.  Sectional damage factors of RC beams at different spacings of stirrups

    图  14  不同边界条件下RC梁的动态损伤

    Figure  14.  Dynamic damage of RC beams under different boundary conditions

    图  15  不同边界条件下RC梁的截面损伤因子

    Figure  15.  Sectional damage factors of RC beams under different boundary conditions

    图  16  不同边界条件下RC梁的碰撞力和跨中挠度时程曲线

    Figure  16.  Histories of impact force and midspan deflection of RC beams under different boundary conditions

    图  17  不同边界条件下RC梁各部分材料的能量耗散

    Figure  17.  Energy dissipation of the different parts under different boundary conditions

    图  18  不同冲头形状的落锤

    Figure  18.  Drop hammers with different impact noses

    图  19  不同冲击体下RC梁的碰撞力和跨中挠度时程曲线

    Figure  19.  Histories of impact force and midspan deflection of RC beams with different impactors

    图  20  不同冲击体下RC梁的碰撞力和跨中挠度时程曲线

    Figure  20.  Histories of impact force and midspan deflection of RC beams with different impactors

    图  21  不同撞击位置下RC梁的动态损伤

    Figure  21.  Dynamic damage of RC beams with different impact positions

    图  22  不同碰撞位置下RC梁的截面损伤因子

    Figure  22.  Sectional damage factors of RC beams with different impact positions

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出版历程
  • 收稿日期:  2017-08-06
  • 修回日期:  2017-09-21
  • 刊出日期:  2019-01-05

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