Experimental Study on Interaction between Bubble and Concrete Composite Slab in Near-field Underwater Explosion

doi:10.12382/bgxb.2023.1074

Abstract

Abstract:

The response characteristics of concrete composite slab,as the basic component in hydraulic structure under the action ofnear-fieldunderwater explosion and the law of itsinfluence on bubble motion are the key scientific issues to evaluate the damage of underwater explosion to engineering structures. The dynamic process of interaction among bubbles and two types of slab members at different blast distances is studied through a series of underwater explosion tests of reinforced concrete slab and steel-concrete-steel composite slab. The results show that the maximum radius of cylindrical charge with aspect ratio of 1 is consistent with the result calculated by empirical formula. Under the same wall conditions, the pulsation period of bubble increaseswith the decrease of the blast distance, the bubble is gradually adsorbed by the wall, and the damage effect caused by the pulsation and high-speed jet is enhanced. The influence of reinforced concrete slab on the bubble pulsation process is weaker than that of steel-concrete-steel composite slab under the same working conditions. The higher the wall stiffness is, the more obvious the directivity and effect of high-speed jet are.

Key words: underwater explosion, bubble pulsation, high-speed jet, reinforced concrete slab, steel-concrete-steel composite slab

CLC Number:

O383.1

LI Xu, YUE Songlin, QIU Yanyu, WANG Mingyang, DENG Shuxin, LIU Niannian. Experimental Study on Interaction between Bubble and Concrete Composite Slab in Near-field Underwater Explosion[J]. Acta Armamentarii, 2023, 44(S1): 79-89.

Figures/Tables 23

Fig.1 Dimensions and reinforcement of reinforced concrete slab(unit: mm)

Fig.2 Dimensions and structural form of steel-concrete-steel composite slab(unit: mm)

Table 1 Mechanical property parameters of specimen materials

材料类别	强度等级	弹性模量/ GPa	抗压强度/MPa	屈服强度/MPa	抗拉强度/MPa
混凝土	C40	32.5	40
钢板	Q235B	206		390	535
钢筋	HRB400	200		659	422
螺钉	8.8	212		640	800

Fig.3 Experimental setup

Table 2 Experimental conditions

编号	试件类型	浮力参数δ	无量纲距离
编号	试件类型	浮力参数δ	γ_f	γ_b
1		0.187	3.38
2	钢筋混凝土板	0.187	3.38	1.2
3	钢筋混凝土板	0.187	3.38	1.3
4	钢筋混凝土板	0.187	3.38	1.4
5	钢筋混凝土板	0.187	3.38	1.5
6	钢-混凝土-钢组合板	0.187	3.38	1.4
7	钢-混凝土-钢组合板	0.187	3.38	1.5

Fig.4 Underwater explosion bubble pulsationin free field

Fig.5 History curves of radius, upper surface, lower surface and center position of bubble in free field

Fig.6 Pressure-time curve of free field underwater explosion

Fig.7 1.5Rmax underwater explosion bubble pulsationabove the reinforced concrete slab

Fig.8 History curve of 1.5Rmax bubble radius, upper surface, lower surface and center position above the reinforced concrete slab

Fig.9 1.4Rmax underwater explosion bubble pulsationabove the reinforced concrete slab

Fig.10 History curve of 1.4Rmax bubble radius, upper surface, lower surface and center position above the reinforced concrete slab

Fig.11 1.3Rmax underwater explosion bubble pulsationabove the reinforced concrete slab

Fig.12 Time-history curve of 1.3Rmax bubble radius, upper surface, lower surface and center position above the reinforced concrete slab

Fig.13 1.2Rm underwater explosion bubble pulsation above the reinforced concrete slab

Fig.14 Time-history curve of 1.2Rmax bubble radius, upper surface, lower surface and center position above the reinforced concrete slab

Fig.15 1.5Rmax underwater explosion bubble pulsationabove the steel-concrete-steel composite slab

Fig.16 Time-history curve of 1.5Rmax bubble radius, upper surface, lower surface and center position above the steel-concrete-steel composite slab

Fig.17 1.4Rmax underwater explosion bubble pulsationabove the steel-concrete-steel composite slab

Fig.18 Time-history curve of 1.4Rmax bubble radius, upper surface, lower surface and center position above the steel-concrete-steel composite slab

Fig.19 Time-history curves of bubble lower surface position

Fig.20 Relationship between bubble pulsation period and distance parameter

Fig.21 Relationship between vertical displacement of slab and distance parameter

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