Experimental Study on Damage of Reinforced Concrete Slabs under Natural Gas Explosion Load

doi:10.12382/bgxb.2023.0538

Abstract

Abstract:

The damage characteristics of reinforced concrete slabs under the natural gas explosion load are studied experimentally. A semi-underground gas explosion loading device with a volume of 9.8m³ is constructed for the experimental research on the damage of reinforced concrete slabs with the thicknesses of 80 mm and 100 mm and the strengths of C30, C40 and C50 subjected to methane explosion loading. The distribution characteristics of quasi-static pressure, out-of-plane displacement of concrete slabs, and equivalent strain in the explosion space were obtained. The results reveal that the quasi-static pressure exhibits oscillatory features under the combined effect of explosion pressure accumulation and crack venting of reinforced concrete slabs in an enclosed space. The distribution of equivalent strain coincides with the crack pattern, displaying a symmetrical Y shape, and the equivalent strain has the distinct bimodal and trimodal characteristics. The two reinforced concrete slabs with different thicknesses exhibit significantly different failure modes: the reinforcement structure of 80mm-thick reinforced concrete slab remains intact, and the concrete cracked and dispersed, with localized concrete shearing failure, whereas the fracture of 100mm-thick reinforced concrete slab occurred at the fixed joint, and the concrete slab is thrown as a whole, resulting in extensive shearing failure of the reinforced concrete composite.

Key words: reinforced concrete slab, explosion load, failure mode, gas explosion, pressure accumulation

CLC Number:

O383⁺.2

QIAO Boyang, GU Gongtian, WANG Cheng, SONG Shixiang, GAO Yang. Experimental Study on Damage of Reinforced Concrete Slabs under Natural Gas Explosion Load[J]. Acta Armamentarii, 2024, 45(7): 2393-2403.

Figures/Tables 17

Fig.1 Design drawing of concrete specimen

Fig.2 Schematic diagram of gas explosion loading device

Fig.3 Photograph of gas explosion loading device

Table 1 Experimental cases

试验编号	试件强度	试件厚度/mm
1	C30	80
2	C30	100
3	C40	80
4	C40	100
5	C50	80
6	C50	100

Fig.4 Pressure curves of reinforced concrete slabs with different grades

Fig.5 Variation characteristics of explosion pressure

Fig.6 Peak values of explosion pressures in different cases

Fig.7 Impulse versus time for different cases

Table 2 Cloud chart of out-of-plane displacement

Table 3 Cloud chart of equivalent strain

Fig.8 Equivalent strain curves at lateral distance

Fig.9 Equivalent strain curves at longitudinal distance

Fig.10 Explosion damage diagram of C30-80mm slab

Fig.11 Explosion damage diagram of C30-100mm slab

Fig.12 Residual drawing of different reinforced concrete slabs after explosion

Table 4 Statistical table of experimental results

试验编号	试件强度	试件厚度/mm	板体破坏特征	钢筋挠度/m
1	C30	80	局部混凝土冲切破坏	0.41
2	C30	100	大面积钢筋混凝土复合体冲切破坏
3	C40	80	局部混凝土冲切破坏	0.32
4	C40	100	大面积钢筋混凝土复合体冲切破坏
5	C50	80	局部混凝土冲切破坏	0.28
6	C50	100	大面积钢筋混凝土复合体冲切破坏

Fig.13 Final diagram of punching failure modes of reinforced concrete slabs

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