IMPROVEMENT AND VERIFICATION OF LEAKAGE RATE ANALYSIS MODEL FOR DAMAGED AND CRACKED PRESSURE-BEARING SHELL

LI Jian-bo; HU Zhe-wen; LIN Gao; DING Zhi-xin

doi:10.6052/j.issn.1000-4750.2021.12.0010

Volume 40 Issue 9

Sep. 2023

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Article Navigation > Engineering Mechanics > 2023 > 40(9): 214-223

LI Jian-bo, HU Zhe-wen, LIN Gao, DING Zhi-xin. IMPROVEMENT AND VERIFICATION OF LEAKAGE RATE ANALYSIS MODEL FOR DAMAGED AND CRACKED PRESSURE-BEARING SHELL[J]. Engineering Mechanics, 2023, 40(9): 214-223. doi: 10.6052/j.issn.1000-4750.2021.12.0010

Citation:

LI Jian-bo, HU Zhe-wen, LIN Gao, DING Zhi-xin. IMPROVEMENT AND VERIFICATION OF LEAKAGE RATE ANALYSIS MODEL FOR DAMAGED AND CRACKED PRESSURE-BEARING SHELL[J]. Engineering Mechanics, 2023, 40(9): 214-223. doi: 10.6052/j.issn.1000-4750.2021.12.0010

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IMPROVEMENT AND VERIFICATION OF LEAKAGE RATE ANALYSIS MODEL FOR DAMAGED AND CRACKED PRESSURE-BEARING SHELL

doi: 10.6052/j.issn.1000-4750.2021.12.0010

LI Jian-bo^{1, 2
,
,},
HU Zhe-wen^{1, 2
,},
LIN Gao^{1, 2
,},
DING Zhi-xin^3
,

1.
State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China
2.
Institute of Earthquake Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China
3.
State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment, China Nuclear Power Engineering Co., Ltd., Shenzhen, Guangdong 518172, China

Received Date: 2021-12-31
Accepted Date: 2022-05-27
Rev Recd Date: 2022-04-13

Available Online: 2022-05-27

Publish Date: 2023-09-06

Abstract

Abstract

The leakage of radioactive, flammable and other dangerous gases from the pressure-bearing shell would pose a major threat to the environment, and the leakage assessment is a necessary prerequisite for the optimization of emergency measures. Aiming at the micro-cracking of the thick shell wall under severe accidents, an efficient and quantitative analysis numerical model for the leakage rate is established. Based on the principle of flow conservation, an improved model is proposed for calculating the leakage rate through a variable cross-section channel formed by multi-segment micro-cracks in a thick-walled structure. The concrete plastic damage model is applied to simulate the nonlinear damage of the structure under its ultimate load, and the model for calculating the scale of smeared micro-cracks is improved by the transformation between the geometric irregular element and the regular space realized through an isoparametric function. Through numerical examples, the research results were compared with those in the literature. The stability and validity of the above two sub-models are verified separately, and the feasibility of the model is further verified by the leakage rate analysis of the damaged shear wall. Finally, the model is applied to a prestressed concrete complex pressure-bearing shell resisting high temperature and internal pressure damage. The results show that the improved model is suitable for the leakage rate analysis of thick-walled, porous and, other complex pressure-bearing structures, which has a certain practical engineering significance.
- pressure-bearing shell,
- gas leakage,
- conservation of flow,
- concrete damage plastic,
- isoparametric transformation,
- micro-crack

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References(31)

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