天然气爆炸载荷作用下钢筋混凝土板毁伤试验研究

doi:10.12382/bgxb.2023.0538

摘要/Abstract

摘要：

为研究天然气爆炸压力积聚作用下钢筋混凝土板的毁伤规律,搭建9.8m³半地下式气体爆炸加载装置,对两种厚度(80mm、100mm)、3种强度(C30、C40、C50)的钢筋混凝土板进行当量甲烷爆炸加载下的毁伤试验研究,获得爆炸空间中准静态压力、钢筋混凝土板面外位移、等效应变等分布特征。研究结果表明:封闭空间中,爆炸压力积聚与板体开裂泄压作用下,爆炸准静态压力出现振荡特征;等效应变与裂纹特征一致,呈对称Y型分布,且等效应变具有明显的双峰和三峰特征;两种厚度的钢混板具有显著不同的破坏模式,80mm厚度时钢筋结构保持完整,混凝土破裂飞散,发生局部混凝土冲切破坏,100mm时在固接处发生断裂,混凝土板整体抛出,产生大面积钢筋混凝土复合体冲切破坏。

关键词: 钢筋混凝土板, 爆炸载荷, 破坏模式, 气体爆炸, 压力积聚

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

中图分类号:

O383⁺.2

乔博阳, 谷恭天, 王成, 宋诗祥, 高扬. 天然气爆炸载荷作用下钢筋混凝土板毁伤试验研究[J]. 兵工学报, 2024, 45(7): 2393-2403.

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.

图/表 17

图1 混凝土试件设计图

Fig.1 Design drawing of concrete specimen

图2 气体爆炸加载装置示意图

Fig.2 Schematic diagram of gas explosion loading device

图3 气体爆炸加载装置实物图

Fig.3 Photograph of gas explosion loading device

表1 试验工况

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

图4 不同标号钢混板压力曲线

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

图5 爆炸压力变化特征

Fig.5 Variation characteristics of explosion pressure

图6 不同工况爆炸压力峰值

Fig.6 Peak values of explosion pressures in different cases

图7 不同工况下冲量随时间变化曲线

Fig.7 Impulse versus time for different cases

表2 面外位移云图

Table 2 Cloud chart of out-of-plane displacement

表3 等效应变云图

Table 3 Cloud chart of equivalent strain

图8 横向距离等效应变曲线

Fig.8 Equivalent strain curves at lateral distance

图9 纵向距离等效应变曲线

Fig.9 Equivalent strain curves at longitudinal distance

图10 C30-80mm钢筋混凝土板爆炸毁伤图

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

图11 C30-100mm钢筋混凝土板爆炸毁伤图

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

图12 不同钢筋混凝土板爆后残余图

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

表4 试验结果统计

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

图13 钢筋混凝土板的冲切破坏形式末态图

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

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