Analysis of explosion resistance of composite floating roofs under implosion loads

doi:10.16265/j.cnki.issn1003-3033.2026.05.1203

Abstract

Abstract:

In order to elucidate the combustion and explosion of volatile gas leaks caused by degradation of the floating roof seal performance and its destructive mechanism on composite floating roofs, a multiphase coupled model of liquid storage-composite floating roof incorporating the cell structure of the honeycomb core layer was established. Multiphase coupling analysis of the tank's combustible gas, composite floating roof, and stored liquid was employed in this study to compare damage patterns in the roof panel and honeycomb core under implosion loads. A methodical inquiry was initiated to explore the impact of panel layering angles, honeycomb geometric parameters (including wall thickness, height, and edge length), and cellular element configurations (i.e., regular hexagons, circular, close-packed, and sparingly packed cells) on the blast resilience performance of floating roofs. The results indicate that, in circumstances where liquid levels are at a low ebb, the upper panel is primarily subject to matrix tensile damage (6.82% area fraction), accompanied by 0.16% fibre compression and matrix compression damage. The optimal panel lay-up angle [45°/90°/45°/90°] has been demonstrated to reduce matrix tensile damage to 5.03% area fraction, thus yielding the optimum level of explosion resistance. Hexagonal honeycomb cores have been shown to demonstrate superior blast resistance in comparison to circular cores, while densely packed circular honeycomb exhibits greater load-bearing capacity than sparsely packed configurations. Increasing the thickness and height of honeycomb cells, or reducing cell edge length, has been demonstrated to enhance the floating roof's capacity for blast resistance.

Key words: implosion load, composite floating roof, explosion resistance, matrix tensile, honeycomb core layer

CLC Number:

X932爆炸安全与防火、防爆

Lu Ye, Ding Yuqi, Wang Zhijian, Lyu Qilin, Li Zhichao, Cao Bingyang. Analysis of explosion resistance of composite floating roofs under implosion loads[J]. China Safety Science Journal, 2026, 36(5): 174-181.

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TNT当量/g	试件	后板中点挠度/mm		相对误差/%
TNT当量/g	试件	蜂窝夹芯板	等效模型	相对误差/%
20	R1	7.50	7.87	4.93
20	R4	12.50	12.60	0.80
30	R1	11.50	11.60	0.88
	R2	12.00	12.30	2.50
	R3	15.00	15.90	6.00
40	R1	16.00	16.10	0.63

损伤形式	浮盘上面板损伤				浮盘下面板损伤
损伤形式	半径/m	角度/(°)	面积/m²	占比/%	半径/m	角度/(°)	面积/m²	占比/%
纤维拉伸	—	—	—	—	—	—	—	—
纤维压缩	18.7~18.8	41~48	0.44	0.16	—	—	—	—
基体拉伸	0~5.2	30~60	18.93	6.82	0~4.3	36~52	7.62	2.75
基体压缩	18.7~18.8	41~48	0.44	0.16	—	—	—	—

浮盘结构	评价指标	整体模型	局部模型	相对变化率/%
上面板	高度变形峰值/mm	-49.3	-46.5	-5.7
上面板	等效应力峰值/MPa	143	134	-6.3
蜂窝芯层	高度变形峰值/mm	-49.3	-46.5	-5.7
蜂窝芯层	等效应力峰值/MPa	3	24	700
下面板	高度变形峰值/mm	-49.2	-46.4	-5.6
下面板	等效应力峰值/MPa	126	116	-7.9

面板铺层	面板结构损伤
	上面板		下面板
	面积/m²	占比/%	面积/m²	占比/%
第1层铺层	0.250	100	0.250	100
第2层铺层	0.245	98	0.218	87
第3层铺层	0.245	98	0.218	87
第4层铺层	0.250	100	0.250	100

面板铺设角度/(°)	损伤半径/m	损伤角度/(°)	损伤面积/m²	损伤占比/%
[45/-45/45/-45]	0~5.2	30~60	18.93	6.82
[45/90/45/90]	2.3~5.2	35~90	13.96	5.03
[45/0/45/0]	0~4.7	0~40; 70~90	26.79	9.65
[-45/90/-45/90]	0~2.3	0~30; 50~70	15.30	5.51
[0/90/0/90]	0~5.2	0~25; 70~90	18.40	6.63