钢筋混凝土梁抗冲击性能和设计方法研究

赵德博,易伟建

振动与冲击 ›› 2015, Vol. 34 ›› Issue (11) : 139-145.

PDF(2797 KB)
PDF(2797 KB)
振动与冲击 ›› 2015, Vol. 34 ›› Issue (11) : 139-145.
论文

钢筋混凝土梁抗冲击性能和设计方法研究

  • 赵德博,易伟建
作者信息 +

Study on impact response and design method of reinforced concrete beams

  •  Zhao De-bo,YI Wei-jian
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摘要

为研究钢筋混凝土梁在冲击荷载作用下的性能,进行了4根钢筋混凝土梁的落锤冲击试验,试验变量为冲击质量和冲击速度。试验中量测了冲击力、支反力和跨中位移,并用高速摄像机记录了冲击过程中的裂缝发展。试验梁呈现了两种不同的梁锤接触区域破坏模式。随冲击速度提高和冲击质量减小,落锤动能转化为梁整体变形耗能的比例减小,更多能量消耗在梁锤接触区域的局部破坏上。通过对本次试验和前人试验结果的统计分析,提出了估算冲击荷载作用下梁体最大挠度的经验公式。公式中考虑了冲击体质量的影响,其准确度较先前研究者提出的经验公式有所提高。

Abstract

 In order to research the performance of reinforced concrete (RC) beams under impact loading, drop hammer tests were carried on 4 RC beams and experimental variables were impact mass and impact velocity. Impact force, reaction force and mid-span deflection were measured. The crack propagation was recorded using a high-speed video camera. The specimens show two different failure patterns of the beam-hammer contact zone. With impact velocity increasing and impact mass decreasing, proportion of the beam overall deformation energy translated from the hammer kinetic energy reduce, more energy is consumed by local damage of the beam-hammer contact zone. Based on this and previous experimental results, an empirical formula for estimating maximum deflection of the beam is derived. The formula considers influence of the impact mass and its accuracy is improved.

关键词

钢筋混凝土梁 / 落锤试验 / 低速冲击 / 设计方法

Key words

 RC beam / drop hammer test / low velocity impact / design method

引用本文

导出引用
赵德博,易伟建. 钢筋混凝土梁抗冲击性能和设计方法研究[J]. 振动与冲击, 2015, 34(11): 139-145
Zhao De-bo,YI Wei-jian. Study on impact response and design method of reinforced concrete beams[J]. Journal of Vibration and Shock, 2015, 34(11): 139-145

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