Experimental Study on the Damage Characteristics and Laws of RC Beams under Close-in Blast Loading of Thermobaric Explosives

doi:10.12382/bgxb.2022.0897

Abstract

Abstract:

As a high-energy density explosive, the blast damage effect and mechanism of thermobaric explosive are different from traditional explosives. First of all, the characteristics and propagation law of thermobaric explosive blast shock wave are studied through the open space thermobaric explosive blast shock wave and thermal effect test. High-speed camera technology and fiber optic multispectral line temperature measurement technology are used to analyze the evolution characteristics of explosive fireball and the fireball surface temperature change pattern. Secondly, in order to study the destructive effect of the blast loads of thermobaric explosives on reinforced concrete structures, two typical reinforced concrete beams were subjected to explosion tests with different proportional blast distances. The damage characteristics and laws of two kinds of reinforced concrete (RC) beams with different charges and distances were elucidated. The research results show that, compared to TNT, the blast shock wave of thermobaric explosive has a large overpressure peak, long positive pressure action time and slow decay of peak characteristics, the thermobaric explosive blast temperature reaches up to 2400K, more than 1000K high temperature duration is more than 160ms, and the high impulse blast impact and sustained high temperature action lead to a greater degree of damage to reinforced concrete structures. Combining the effect of charges on the pattern of destruction, a damage criterion based on the proportional scaled distance and the amount of charge is proposed for reinforced concrete beams under the close-in (0.2-0.75m) blast loading of thermobaric explosives.

Key words: thermobaric explosive, reinforced concrete beam, damage characteristics, damage criterion

CLC Number:

TJ301

LIU Ju, ZHANG Guokai, WANG Zhen, YAO Jian, LI Jie, YU Siyuan, JI Yuguo. Experimental Study on the Damage Characteristics and Laws of RC Beams under Close-in Blast Loading of Thermobaric Explosives[J]. Acta Armamentarii, 2024, 45(3): 864-874.

Figures/Tables 20

References 32

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梁类型	缩比内容	原型梁尺寸/ mm	缩比试验梁尺寸/mm
	跨度	6000	2000
框架结构梁A	箍筋间距	200	70
	截面尺寸	350×600	117×200
	跨度	6000	2000
高层结构梁B	箍筋间距	200	70
	截面尺寸	250×500	83×167

梁类型	缩比内容	原型梁尺寸/ mm	缩比试验梁尺寸/mm
	跨度	6000	2000
框架结构梁A	箍筋间距	200	70
	截面尺寸	350×600	117×200
	跨度	6000	2000
高层结构梁B	箍筋间距	200	70
	截面尺寸	250×500	83×167

构件编号	构件尺寸/mm	配筋参数	爆距/m	药量/kg	比例爆距/(m·kg^-1/3)
A1	83×167×2000	截面配筋率1.2% 受压钢筋2ϕ6mm 受拉钢筋4ϕ6mm 箍筋ϕ6mm@70mm	0.75	2	0.595
A2			0.50	2	0.397
A3			0.40	2	0.317
A4			0.30	2	0.238
A5			0.50	3	0.347
A6			0.40	3	0.277
A7			0.20	1	0.200
B1	117×200×2000	截面配筋率1.2% 受压钢筋4ϕ6mm 受拉钢筋6ϕ6mm 箍筋ϕ6mm@70mm	0.40	2	0.317
B2			0.30	2	0.238
B3			0.20	2	0.158
B4			0.40	3	0.277

构件编号	构件尺寸/mm	配筋参数	爆距/m	药量/kg	比例爆距/(m·kg^-1/3)
A1	83×167×2000	截面配筋率1.2% 受压钢筋2ϕ6mm 受拉钢筋4ϕ6mm 箍筋ϕ6mm@70mm	0.75	2	0.595
A2			0.50	2	0.397
A3			0.40	2	0.317
A4			0.30	2	0.238
A5			0.50	3	0.347
A6			0.40	3	0.277
A7			0.20	1	0.200
B1	117×200×2000	截面配筋率1.2% 受压钢筋4ϕ6mm 受拉钢筋6ϕ6mm 箍筋ϕ6mm@70mm	0.40	2	0.317
B2			0.30	2	0.238
B3			0.20	2	0.158
B4			0.40	3	0.277

编号	药量/kg	爆距/m	比例爆距/ (m·kg^-1/3)	迎爆面破坏区长度/mm	背爆面震塌区长度/mm	纵向破坏深度/mm	跨中挠度/ mm	钢筋裸露长度/ mm	裂纹数量
A1	2	0.75	0.595	0	0	0	2	0	2
A2	2	0.50	0.397	224	0	50	5	0	6
A3	2	0.40	0.317	243	0	80	11	50	6
A4	2	0.30	0.238	353	431	167	23	200	8
A5	3	0.50	0.347	240	300	167	45	210	10
A6	3	0.40	0.277	360	520	167	120	420	10
A7	1	0.20	0.200	320	360	167	75	260	8