Experimental Study on Cumulative Damage of Shear Wall Under Multiple Internal Explosions

doi:10.12382/bgxb.2023.0768

Abstract

Abstract:

With the improvement of guidance precision and penetration capability of missile weapons, multiple internal explosions have gradually become an important form of attacking buildings. Shear wall is an important structural component in buildings, and its damage mechanism and failure mode need to be further studied under internal explosions. In order to reproduce the constraint conditions and load scenarios of shear wall, a 1/3 scaled reinforced concrete structure was used to conduct multiple internal explosion tests with different TNT charge masses. By analyzing the crack pattern, damage level and mid-span displacement of structure component, the influence of internal explosion strength and loading times on the failure mode and damage level of the shear wall is studied. The results indicated that when the internal explosive load is small, the failure mode of shear wall would change from bending to bending-shear. However, when the internal explosive load is large, the failure mode of shear wall would change from bending-shear to complete shear. Under the multiple explosive loading scenarios, the deformation resistance of shear wall with initial mild damage is larger than that of the shear wall without initial damage. On the other hand, the deformation resistance of shear wall with the initial moderate or higher-level damage is lower than that of the shear wall without initial damage. Therefore, the correlation between multiple damages should be considered in order to evaluate the cumulative damage of shear wall component.

Key words: shear wall, internal explosion, cumulative damage, damage assessment

CLC Number:

O383

BAI Zhun, HU Yutao, QIAN Bingwen, YAO Hang, LI Xian, GUO Xuekang. Experimental Study on Cumulative Damage of Shear Wall Under Multiple Internal Explosions[J]. Acta Armamentarii, 2023, 44(S1): 50-58.

Figures/Tables 13

Fig.1 Three-dimensional view of reinforced concrete shear wall structure

Fig.2 Installation of blast pressure transducer

Fig.3 Installation of displacement gauge and velocity gauge

Table 1 Setting of test scenarios

工况编号	装药位置(内部空间几何中心)	TNT当量/g
1-1	房间1	250
1-2	房间1	400
1-3	房间1	400
2-1	房间2	400
3-1	房间3	800
3-2	房间3	800

Fig.4 Overpressure-time history curve of shear walls under internal explosion scenarios

Table 2 Crack pattern and damage of shear walls in Room 1 after internal explosion

Table 3 Crack pattern and damage of shear walls in Room 2 after internal explosion

Table 4 Crack pattern and damage of shear walls in Room 3

Table 5 Damage levels of shear walls

θ/(°)	x_max/mm	毁伤等级
θ≤0.5°	x_max≤6.1	无毁伤
0.5°<θ≤2°	6.1<x_max≤24.4	轻度毁伤
2°<θ≤6°	24.4<x_max≤73.6	中度毁伤
6°<θ≤12°	73.6<x_max≤148.8	重度毁伤
θ>12°	x_max>148.8	完全毁伤

Fig.5 Time-history curve of mid-span displacement of shear wall in scenario 1-1

Fig.6 Damage level in scenarios 1-1, 1-2 and 2-1

Fig.7 Damage level in scenarios 1-2, 1-3, 3-1 and 3-2

Fig.8 Relationship between ideal resistance-displacement curve and damage grade of shear wall

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