液化天然气储罐混凝土穹顶的冲击破坏模式与机理

翟希梅; 赵新宇

doi:10.11883/bzycj-2017-0090

液化天然气储罐混凝土穹顶的冲击破坏模式与机理

doi: 10.11883/bzycj-2017-0090

翟希梅^{1, 2,},
赵新宇^{1, 2}

1.
哈尔滨工业大学结构工程灾变与控制教育部重点实验室, 黑龙江哈尔滨 150090
2.
哈尔滨工业大学土木工程智能防灾减灾工业和信息化部重点实验室, 黑龙江哈尔滨 150090

基金项目:

国家自然科学基金项目 51378151

详细信息

作者简介:
翟希梅(1971-), 女, 教授, 博士生导师, xmzhai@hit.edu.cn

中图分类号: O346
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- 被引次数: 0
出版历程
- 收稿日期: 2017-03-23
- 修回日期: 2017-05-23
- 刊出日期: 2018-09-25

Damage modes and failure mechanism of concrete dome of LNG storage tank

ZHAI Ximei^{1, 2
,},
ZHAO Xinyu^{1, 2}

1.
Key Laboratory of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Harbin 150090, Heilongjiang, China
2.
Key Laboratory of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin 150090, Heilongjiang, China

摘要

摘要: 为获得大型全容式LNG储罐混凝土穹顶结构在圆柱形刚体冲击作用下的动力响应、失效模式以及失效机理，基于160 000 m³的LNG储罐，应用ANSYS/LS-DYNA建立LNG储罐精细化有限元数值模型，并通过对弹丸冲击混凝土靶板实验的数值模拟，验证了有限元模拟方法及材料模型的适用性。通过分析圆柱体冲击物撞击下LNG储罐的动力响应，提出储罐穹顶结构的3种失效模式即局部凹陷、混凝土剥落、击穿破坏，并根据冲击过程中能量的传递特征揭示了每类失效模式对应的失效机理。最后通过大量参数分析获得不同冲击物直径、冲击位置、冲击角度对LNG储罐结构的最大冲击响应及失效模式的影响规律。结果表明，冲击角度、冲击物直径对LNG储罐混凝土外罐穹顶的失效模式影响较大，冲击位置对储罐穹顶失效模式的影响较小，可以忽略。
- LNG储罐 /
- 混凝土穹顶 /
- 破坏模式 /
- 失效机理
Abstract: In order to investigate the damage modes and failure mechanism of the concrete dome of the liquefied natural gas (LNG) storage tank subjected to impact by a rigid circular cylinder, the finite element (FE) model of the outer concrete tank of the 160 000 m³ LNG storage tank for an actual LNG project and a cylindrical impactor is established based on ANSYS/LS-DYNAFE analysis software platform. The accuracy of the numerical simulation method and the material model employed has been verified by simulating the impact perforation of reinforced concrete slabs subjected to projectile with high speed. The dynamic response of structures under impacting with variable speed, angle, location, and diameter are studied. Based on the dynamic response of the outer concrete tank of the LNG storage tank subjected to impact loading, three damage modes are defined and the failure mechanism of each mode is revealed from the point view of energy. The response characteristics and rules with the change of the impact parameters are obtained. The results show that the impact angle and the diameter of the impactor affect significantly on the failure modes of dome, and the impact position at the dome has a negligible effect on the failure modes.
- LNG storage tank /
- concrete dome /
- damage mode /
- failure mechanism

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图 1 弹丸靶板有限元模型

Figure 1. FE model

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图 2 靶板破坏现象

Figure 2. Impact perforation

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图 3 LNG储罐剖面图

Figure 3. Profile map of LNG tank

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图 4 LNG储罐有限元模型

Figure 4. FE model of LNG outer tank

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图 5 冲击位置示意图

Figure 5. Locations A and B at dome

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图 6 失效模式分布图

Figure 6. Distribution of failure modes

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图 7 冲击力

Figure 7. Impact force

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图 8 冲击物速度

Figure 8. Velocity of impactor

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图 9 穹顶应变能

Figure 9. Internal energy of dome

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图 10 节点位置示意图

Figure 10. Designation of points

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图 11 节点位移

Figure 11. Displacement of point

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图 12 穹顶应变能

Figure 12. Internal energy of dome

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图 13 穹顶应变能

Figure 13. Internal energy of dome

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图 14 局部凹陷全过程划分示意图

Figure 14. Partition of failure process for local distortion

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图 15 穹顶应变能

Figure 15. Internal energy of dome

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图 16 冲击全过程划分示意图

Figure 16. Partitions of failure process for impact

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图 17 穹顶应变能

Figure 17. Internal energy of dome

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表 1 实验与有限元模拟结果对比

Table 1. Comparison of simulation results and experimental results

类别	试件	v_i/(m·s^-1)	v_{r, exp}/(m·s^-1)	v_{r, CSCM}/(m·s^-1)	v_{r, HJC}/(m·s^-1)	v_{r, CSCM}/v_{r, exp}	v_{r, HJC}/v_{r, exp}
	A1	218	166	160	148	0.964	0.892
	A2	250	199	197	191	0.990	0.960
素混凝土	A3	376	280	277	323	0.989	1.154
	A4	620	529	540	553	1.021	1.045
	B1	501	301	332	326	1.103	1.083
	B2	753	554	551	566	0.995	1.022
	C1	193	131	120	96	0.916	0.732
	C2	268	195	195	191	1.000	0.979
钢筋混凝土	C3	361	300	290	283	0.967	0.943
	C4	608	528	512	519	0.958	0.982
	C5	812	701	704	735	1.004	1.049
	C6	1 246	1 111	1 170	1 220	1.053	1.098

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参考文献(13)

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