Numerical Analysis of Gas Explosion Resistance of Two-way Masonry Walls Strengthened by Spraying Polyurea

doi:10.12382/bgxb.2023.0733

Abstract

Abstract:

In order to study the anti-explosion performance of two-way masonry wall and the reinforcement performance of polyurea on wall under the action of gas explosion, the finite element dynamic analysis software LS-DYNA is used to analyzethe dynamic response andanti-explosion capability of the unreinforced masonry wall and the walls reinforced by spraying the polyurea on the front, back and double-side under uniform loads with different peak values and action time of 100ms. The results show that: the unreinforced wall collapses under the gas explosion load with the peak overpressure of 50kPa, and its peak resistance to 100ms explosion impact load is between 40kPa and 50kPa; compared with the two-way wall reinforced by spraying the polyurea on its front, the backside reinforcement method is more economical and practical. The wall strengthened on the front cracks and collapses under 50kPa load, while the displacements of the back reinforced wall and the double-sided reinforced wall are only 35.3mm and 33.6mm, respectively, and the polyurea spraying on the back can effectively prevent debris splashing.

Key words: polyurea, masonry, explosion load, finite element simulation

CLC Number:

TU362

LIU Jinchun, WANG Yuying, SUN Ni. Numerical Analysis of Gas Explosion Resistance of Two-way Masonry Walls Strengthened by Spraying Polyurea[J]. Acta Armamentarii, 2023, 44(S1): 138-143.

Figures/Tables 14

Fig.1 Geometric model of masonry wall

Table 1 Wall material parameter

材料	ρ/ (kg·m^-3)	E/ MPa	μ	σ_b/ MPa	σ_τ/ MPa	σ_s/ MPa	K_IC/ (N·m^-1)	τ
砌块	1150	380	0.15	1.00	0.50	9.0	120	0.03
砂浆	2100	4644	0.25	1.76	0.90	17.6	140	0.03

Table 2 Material parameters of concrete frame

材料	ρ'/(kg·m^-3)	E'/MPa	μ'
混凝土	2500	30000	0.2

Fig.2 Mid-span displacement-time curve of SWW wall

Fig.3 Failure pattern of SWW wall

Table 3 Polyurea material parameters

ρ_p/(kg·m^-3)	E_p/MPa	μ_p	ε_m	N
1000	212	0.4	0.5	2

Table 4 σp-εp values

有效塑性应变ε_p	0	0.23	0.50
有效应力σ_p/MPa	11.5	15.5	24.4

Fig.4 Mid-span displacement-time curve of SWY wall

Fig.5 Failure pattern of SWY wall

Fig.6 Mid-span displacement-time curve of SWB wall

Fig.7 Failure pattern of SWB wall

Fig.8 Mid-span displacement-timecurve of SWS wall

Fig.9 Failure pattern of SWS wall

Table 5 Wall mid-span displacement statistics

荷载/kPa	位移/mm
荷载/kPa	SWW	SWY	SWB	SWS
30	13.1	12.8	12.4	12.1
40	25.3	23.5	21.9	20.7
50	倒塌	倒塌	35.3	33.6
60	-	-	倒塌	倒塌

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