接触爆炸荷载对钢筋混凝土梁的局部毁伤效应

王辉明; 刘飞; 晏麓晖; 汪剑辉; 尚伟; 吕林梅

doi:10.11883/bzycj-2020-0171

接触爆炸荷载对钢筋混凝土梁的局部毁伤效应

doi: 10.11883/bzycj-2020-0171

王辉明^{1, 2,},
刘飞^2, ,,
晏麓晖³,
汪剑辉²,
尚伟^{2, 4},
吕林梅²

1.
国防科技大学空天科学学院，湖南长沙 410072
2.
军事科学院国防工程研究院，河南洛阳 471023
3.
国防科技大学军事基础教育学院，湖南长沙 410073
4.
南京理工大学机械工程学院，江苏南京 210094

详细信息

作者简介:
王辉明（1995－　），男，硕士研究生，whui_ming@126.com

通讯作者:
刘　飞（1977－　），男，博士，高级工程师， 13525944181@163.com

中图分类号: O383
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- 被引次数: 0
出版历程
- 收稿日期: 2020-05-28
- 修回日期: 2020-09-01
- 刊出日期: 2020-12-05

Local damage effects of reinforced concrete beams under contact explosions

WANG Huiming^{1, 2
,},
LIU Fei^{2
, ,},
YAN Luhui³,
WANG Jianhui²,
SHANG Wei^{2, 4},
LYU Linmei²

1.
College of Aerospace Science, Nation University of Defense Technology, Changsha 410072, Hunan, China
2.
Research Institute of Defense Engineering, Academy of Military Science, Luoyang 471023, Henan, China
3.
College of Military Basic Education, Nation University of Defense Technology, Changsha 410073, Hunan, China
4.
Institute of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China

摘要

摘要: 为得到接触爆炸下钢筋混凝土（reinforced concrete，RC）梁的局部破坏模式和毁伤效应，对同一尺寸的RC梁进行了不同装药量的接触爆炸试验研究。试验中采用框架结构中典型工程尺度RC原型梁为研究对象，通过4次爆炸试验，观测了RC梁在不同装药量下的局部破坏模式和破坏特征，分析了装药量对局部毁伤效应的影响。研究结果表明：接触爆炸荷载作用下，RC梁将发生正面成坑、侧面崩落、背面震塌和截面冲切等局部破坏模式，爆坑深度、震塌厚度、表面毁伤面积以及受压区纵筋变形均与装药量立方根近似呈线性增加关系。在试验数据基础上，将RC梁局部毁伤程度划分为轻度毁伤、中度毁伤、重度毁伤和严重毁伤4个等级，采用比例装药量判据进行评估。研究成果可为抗爆结构设计和结构毁伤评估提供理论依据。
- 接触爆炸 /
- 钢筋混凝土梁 /
- 局部毁伤 /
- 破坏模式
Abstract: In order to investigate the local failure modes and damage effects of reinforced concrete (RC) beams under contact explosion, the experimental studies of RC beams with the same size under different TNT charge masses were conducted. In the tests, the typical engineering scale RC prototype beams designed for frame structures were used as research objects. Through four independent explosion tests, the failure modes and damage characteristics of the RC beams were observed at different TNT charge masses, and the influence of different TNT charge masses on the local damage was analyzed. The results show that RC beams undergo four types of local failure modes such as front crater, side breakdown, back collapse and section punching under contact detonations. The depth of crater, thickness of the spallation, surface damaged area, and the deformation of the steel bars exhibited a linear increase with the cubic root of TNT charge masses. Based on the experimental data, the local damage degree could be divided into four grades: slight, moderate, serious and severe, that could be evaluated by the proportional charge criterion. The research results can provide a theoretical basis for designing the anti-blast structures and assessing the damage of components subjected to explosive loading.
- contact explosion /
- reinforced concrete beam /
- local damage /
- failure mode

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图 1 试验梁结构尺寸及配筋图（单位：mm）

Figure 1. Dimensions and reinforcment diagram of RC beam (unit in mm)

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图 2 试验布置

Figure 2. Experimental arrangement

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图 3 试验用TNT装药

Figure 3. TNT charges used in experiment

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图 4 4 kg装药接触爆炸下梁1^# 破坏形态

Figure 4. Failure patterns of beam 1^# under contact explosion of 4 kg charge

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图 5 6 kg装药接触爆炸下梁2^# 破坏形态

Figure 5. Failure patterns of beam 2^# under contact explosion of 6 kg charge

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图 6 8 kg装药接触爆炸下梁3^# 破坏形态

Figure 6. Failure patterns of beam 3^# under contact explosion of 8 kg charge

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图 7 16 kg装药接触爆炸下梁4^# 破坏形态

Figure 7. Failure patterns of beam 4^# under contact explosion of 16 kg charge

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图 8 爆坑形状

Figure 8. Crater shape

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图 9 震塌投影变化

Figure 9. Change tendency of L_z/L

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图 10 表面毁伤形状示意图

Figure 10. Schematic diagram of surface damage shape

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图 11 横截面破坏面积比

Figure 11. Ratios of damage area to cross-section

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图 12 迎爆面X₁、$X'_1 $、X₂随装药变化

Figure 12. Changes of X₁, $X'_1 $ and X₂ with charge

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表 1 表面毁伤特征参数（单位：mm）

Table 1. Surface damage characteristic parameters (unit: mm)

试验	$L_1/L'_1 $	$L_2/L'_2 $	$L_3/L'_3 $	L₄	$H_1/H'_1 $	$H_2/H'_2 $	B₁	B₂
1	1 210/1 500	800/850	1 100/1 300	560	175/150	100/90	100	130
2	1 260/1 400	1 000/800	1 480/1 450	710	90/125	100/125	170	100
3	1 470/1 440	1 270/1 250	1 450/1 500	1 000	100/85	100/120	150	130
4	1 810/1 900	1 500/1 380	1 570/1 690	1 040	100/80	150/150	111	57

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表 2 RC梁接触爆炸局部毁伤等级

Table 2. Local damage grades of RC beam under contact explosion

试验编号	毁伤等级	破坏形态	主要特征	判别标准	毁伤判据
−	轻度毁伤		迎爆面形成爆坑，纵向钢筋轻微变形；背爆面混凝土无层裂；侧面混凝土轻微剥落；梁整体无明显变形	$h {\simfont\text{＞}} 0,\;{h_{\rm z}} = 0$	${Q^{1/3}}/H {\simfont\text{＜}} 2.1$
−	中度毁伤		迎爆面形成爆坑，纵向钢筋适量变形；背爆面混凝土有碎块震塌、纵向钢筋外露但变形较小，或混凝土出现层裂裂纹（加强型）；侧面混凝土部分剥落；梁整体轻度变形轻微变形（加强型）	$0 {\simfont\text{＜}} h + {h_{\rm z}} {\simfont\text{＜}} H/2$	$2.1 {\simfont\text{＜}} {Q^{1/3}}/H {\simfont\text{≤}} {\rm{2}}{\rm{.5}}$
1^#、2^#	重度毁伤		迎爆面爆坑较大，纵向钢筋较大变形；背爆面混凝土震塌脱落、爆坑与震塌坑连通，或混凝土有碎块脱落、局部钢筋外露（加强型）；侧面混凝土严重剥离；梁整体变形明显或轻度变形（加强型）	$H/2 {\simfont\text{≤}} h + {h_{\rm z}} {\simfont\text{＜}} H$	$2.{\rm{5}} {\simfont\text{≤}} {Q^{1/3}}/H {\simfont\text{＜}} {\rm{3}}{\rm{.8}}$
3^#、4^#	严重毁伤		混凝土贯穿破坏，迎爆面纵向钢筋变形很大或断裂；背爆面混凝土大量震塌脱落、纵向钢筋大变形。特别严重时，横截面冲切破坏，迎、背爆面纵向钢筋都有剪断，梁倒塌	$h + {h_{\rm z}} {\simfont\text{＞}} H$	${Q^{1/3}}/H {\simfont\text{＞}} {\rm{3}}{\rm{.8}}$
注：所谓加强型，指本文研究的采用腰筋和侧面底筋加固的梁

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