The Damage Effect of Reinforced Concrete Beams Subjected to Synchronous Explosion of Double Charges

doi:10.12382/bgxb.2023.0286

Abstract

Abstract:

To study the damage effect of synchronous explosive loading of double charges on reinforced concrete (RC) beams, the experiments were conducted on RC beams subjected to the synchronous explosive loading of double charges. The damage characteristics and displacement response of RC beams were obtained through the experiments. Based on the experimental results, a corresponding RC beam synchronous explosion simulation model with double charges is established using finite element simulation software, considering the influence of simply supported boundary conditions. The reliability of the simulation model is verified by comparing the local failure characteristics and maximum displacement responses of RC beams from experiments and simulation. Based on this, the effects of charge spacing and blast height on the failure characteristics and displacement of concrete beams during synchronous explosion of double charges are further studied. In addition, the damage effects of double charges and equivalent single charges on the concrete beams at the same blast height are compared. The results show that the failure mode of concrete beams gradually changes from local failure to punching shear failure with the increase of charge spacing. As the charge spacing increases, the displacement response and front surface failure of concrete beam shows a trend of first increasing and then decreasing, mainly due to the enhancement effect of shock wave superposition during synchronous explosions of two charges. Besides, compared to the destructive effect of a single charge with the same total mass on concrete beams, the local damage of RC beams under the action of double charges is more uniform. Moreover, there exists a range of intervals related to charge spacing, within which the displacement response of RC beams under double charges is greater than that under equal mass single charge: the smaller the blast height, the larger the range of this interval; The larger the charge mass, the larger the range of this interval.

Key words: double charges, synchronous explosion, RC beams, superimposed shock wave, charge spacing, damage range

CLC Number:

TJ301

XU Yingliang, LIU Yan, YAN Junbo, BAI Fan, YU Hao, LI Xu, WANG Hongfu. The Damage Effect of Reinforced Concrete Beams Subjected to Synchronous Explosion of Double Charges[J]. Acta Armamentarii, 2023, 44(12): 3719-3732.

Figures/Tables 30

Fig.1 Details of reinforced concrete beam[23]

Fig.2 Schematic diagram of test system

Fig.3 Hinged support

Fig.4 Displacement sensor

Fig.5 Free field pressure sensor

Fig.6 Explosion test setup for RC beams

Table 1 Test program

序号	装药质量M/kg	H/cm	L/cm
1	1
2	0.5+0.5	25	20
3	0.5+0.5		50

Fig.7 Beam 1∶1kg TNT

Fig.8 Beam 2∶0.5kg+0.5kg,L=20cm

Fig.9 Beam 3∶0.5kg+0.5kg,L=50cm

Table 2 Results of local failure

序号	M/kg	H/cm	L/cm	L_c/cm	L_p/cm	L_s/cm
1	1			18	35	96.4
2	0.5+0.5	25	20	26	49	76
3	0.5+0.5		50		49

Fig.10 Comparison of displacement responses

Fig.11 FE model of RC beams under double explosion

Table 3 aterial model and EOS parameters of TNT explosives[23]

ρ_e/(g·cm^-3)	D/(cm·μs^-1)	p_CJ/MPa	A/MPa	B/MPa	R₁	R₂	ω	e₀/MPa
1.63	6.93	0.21	3.712	0.03231	4.15	0.95	0.30	0.07

Table 4 Material model and EOS parameters of air[23]

ρ_a/(g·cm^-3)	C₀	C₁	C₂	C₃	C₄	C₅	C₆	E₀/MPa
1.225	0	0	0	0	0	0.4	0.4	2.5×10⁶

Fig.12 Comparison of simulated and test results of local failure

Fig.13 Comparison of simulated and test results of displacement

Fig.14 Comparison of simulated and test results of pressure

Fig.15 Effect of charge space L on the damage mode of RC beams for H=25cm

Fig.16 Effect of charge space L on the side peeling-off failure span and top crushing depth

Fig.17 Effect of charge space L on the max displacement

Fig.18 Schematic diagram of the action principle of synchronous explosion shock wave of double charges

Fig.19 Comparisons of peak reflected overpressure distribution and shock wave arrival time on RC beams

Fig.20 Effect of burst height on the failure modes

Fig.21 Effect of stand-off distance on maximum displacement

Fig.22 Comparison of failure characteristics of RC beams under the action of double charges and single charge

Fig.23 Comparison of local failure spans

Fig.24 Comparison of stress waves at locations where spallation occurs

Fig.25 Comparison of maximum displacements of RC beams under the action of two charges and an equivalent single charge

Fig.26 Relationship between displacement enhancement coefficient γ and charge space

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