爆炸荷载作用下钢筋混凝土梁毁伤判据研究

doi:10.3969/j.issn.1000-1093.2016.08.012

摘要/Abstract

摘要： 为研究钢筋混凝土梁在爆炸波作用下的毁伤判据，对两种尺寸的钢筋混凝土梁在缩比条件下进行了不同爆炸距离作用和装药量下的试验研究。试验中以高层和框架结构中最常见的两种梁为研究对象，通过11次独立的爆炸试验，观测了钢筋混凝土梁在不同装药量下的破坏模式和破坏特征。研究结果表明：钢筋混凝土梁在近区爆炸荷载作用下，在同一爆高下，随着装药量的增加，梁的破坏程度逐渐增加，破坏模式由迎爆面中心两侧少量混凝土脱落和背爆面少量断裂裂纹逐渐增加为迎爆面倒三角锥形式混凝土压碎弯曲破坏，背爆面出现三角锥裂纹和背爆面少量混凝土脱落破坏，最终迎爆面和背爆面三角锥破坏区域贯通形成中心区域压碎崩塌弯曲破坏；崩塌区域的尺寸随着装药量增加而逐渐增加。近区爆炸（以爆距0.5 m为例）作用下，试验钢筋混凝土梁的毁伤判据为：当比例爆高Z>0.4 m/kg^1/3 时，梁遭受到轻微破坏；当比例爆高0.3 m/kg^1/31/3 时，梁遭受到中等破坏；当比例爆高0.28 m/kg^1/31/3时，混凝土梁遭受重度破坏；当比例爆高Z<0.28 m/kg^1/3，梁遭受严重破坏。在近区爆炸作用下，钢筋混凝土梁的破坏不仅依赖于爆炸比例距离，还与爆高有关，同一比例距离下爆高越大，梁试件的破坏越严重。研究结果可为工程应用及毁伤评估提供参考。

关键词: 兵器科学与技术, 爆炸荷载, 钢筋混凝土梁, 破坏模式, 毁伤判据

Abstract: In order to investigate the damage criteria of reinforced concrete (RC) beams under blast loading, the experimental study of two different dimensions of RC beams under different blast distances and charge masses is carried out. Two common RC beams designed for tall buildings and frame structures are taken as the research objects. The damage mode and characteristics of RC beams are got through 11 independent blast experiments. The results show that, when RC beams are subjected to close-in blast loading, the damage level increases with the increase in explosive mass at the same blast distance, the damage mode of RC beams changes from a few fall-off of concrete on the two sides of upper side and a few ruptures on the rear face to the compressed flexural damage of reverse triangle cone-shaped concrete on the upper side and triangle cone-shaped crack and a fall-off of concrete on the rear face, and finally the triangle cone-shaped damage areas on both upper side and rear face are perforated to result in a crushed and punched damage of concrete in the middle area. The damage area increases with the increase in explosive mass. Under close-in blast loading (blast distance= 0.5 m for example), the damage criteria of the RC beams used in the experiment are: the beam suffers from minor damage for scaled burst distance Z>0.4 m/kg^1/3; it suffers from moderate damage for scaled burst distance 0.3 m/kg^1/31/3; it suffers from high damage for scaled burst distance 0.28 m/kg^1/31/3; it suffers from serious damage for scaled burst distance Z<0.28 m/kg^1/3. It is also found that the damage of RC beam not only depends on the scaled burst distance under close-in blast loading, but also depends on the burst distance. At the same scaled burst distance, the more the burst distance is, the damage of RC beam is more serious. The results can be useful for engineering application and damage assessments.

Key words: ordnance science and technology, explosion load, reinforced concrete beam, damage mode, damage criterion

中图分类号:

O383

汪维, 刘瑞朝, 吴飚, 李林, 黄家蓉, 王幸. 爆炸荷载作用下钢筋混凝土梁毁伤判据研究[J]. 兵工学报, 2016, 37(8): 1421-1429.

WANG Wei, LIU Rui-chao, WU Biao, LI Lin, HUANG Jia-rong, WANG Xing. Damage Criteria of Reinforced Concrete Beams under Blast Loading[J]. Acta Armamentarii, 2016, 37(8): 1421-1429.

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