Numerical simulation of dynamic response of reinforced masonry wall strengthened with polyurea under gas explosion

LIU Jinchun; WANG Yuying; SUN Ni

doi:10.11883/bzycj-2024-0077

Volume 44 Issue 10

Oct. 2024

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LIU Jinchun, WANG Yuying, SUN Ni. Numerical simulation of dynamic response of reinforced masonry wall strengthened with polyurea under gas explosion[J]. Explosion And Shock Waves, 2024, 44(10): 101405. doi: 10.11883/bzycj-2024-0077

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LIU Jinchun, WANG Yuying, SUN Ni. Numerical simulation of dynamic response of reinforced masonry wall strengthened with polyurea under gas explosion[J]. Explosion And Shock Waves, 2024, 44(10): 101405. doi: 10.11883/bzycj-2024-0077

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Numerical simulation of dynamic response of reinforced masonry wall strengthened with polyurea under gas explosion

doi: 10.11883/bzycj-2024-0077

Department of Civil and Airport Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, Jiangsu, China

Received Date: 2023-12-26
Rev Recd Date: 2024-05-12

Available Online: 2024-05-14

Publish Date: 2024-10-30

Abstract

Abstract

In order to study the anti-explosion ability of reinforced masonry wall and the reinforcement performance of polyurea on the wall, LS-DYNA software was used to numerically simulate the dynamic response of unreinforced masonry wall, reinforced masonry wall, and masonry wall strengthened with polyurea respectively. The anti-gas explosion performance of different walls under gas explosion load with peak value of 5, 10, 20 and 30 kPa was obtained. The reinforcing effect of vertical reinforcement in ash joint and polyurea were compared and analyzed. The results show that: (1) The anti-gas explosion capability of the unreinforced wall is relatively weak, which generally causes irreparable damage under the load of 20 kPa and collapses under the load of 30 kPa. (2) The explosion resistance of the masonry wall can be enhanced by the vertical displacement of rebar in the ash joint and the spraying of polyurea on the wall surface. Under the load of 20 kPa, the peak displacement at mid-span of each reinforced wall is smaller than that of the unreinforced wall, and the damage is lighter, which is repairable. Among them, the anti-explosion effect of double-sided spraying polyurea on unreinforced wall surface is the best, and there is no collapse damage under the load of 30 kPa. The reinforcing effect of vertical reinforcement in ash joint and polyurea spraying on the back surface are the second. (3) The three groups of reinforced walls with polyurea can all withstand 30 kPa gas explosion load. Cracks occur in the middle of the wall strengthened by spraying on the explosive side, fragments splash, the mid-span peak displacement is the largest. Local damage occurs at both ends of the wall strengthened by back side and double-sided spraying, and the walls are basically complete, and the mid-span peak displacement of the wall strengthened by double-side spraying is the smallest. It is shown that spraying polyurea on both sides on the basis of vertical reinforcement in ash joint has the best explosion resistance effect, and can also bear greater gas explosion load. The research results can provide reference for the reinforcement of reinforced masonry wall against gas explosion.
- polyurea,
- reinforced masonry wall,
- gas explosion,
- LS-DYNA

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References(24)

References

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