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- 저자 : Jianqun Jiang (검색결과 2 건)
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Zhang, He,Xu, Chengkan,Shen, Xinyi,Jiang, Jianqun The Society of Naval Architects of Korea 2020 International Journal of Naval Architecture and Oc Vol.12 No.1
After long-term service in deep ocean, pipelines are usually suffered from corrosions, which may greatly influence the Vortex-Induced Vibration (VIV) behavior of pipes. Thus, we investigate the VIV of defective pipelines. The geometric nonlinearity due to large deformation of pipes and nonlinearity in vortex-induced force are simulated. This nonlinear vibration system is simulated with finite element method and solved by direct integration method with incremental algorithm. Two kinds of defects, corrosion pits and volumetric flaws, and their effects of depth and range on VIV responses are investigated. A new finite element is developed to simulate corrosion pits. Defects are found to aggravate VIV displacement response only if environmental flow rate is less than resonance flow rate. As the defect depth grows, the stress responses increase, however, the increase of the defect range reduces the stress response at corroded part. The volumetric flaws affect VIV response stronger than the corrosion pits.
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Chunjiang Fu,Xiaowen Yao,Tao Li,Haiyao Shen,Zhenyu Wang,Jianqun Jiang 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.6
The investigation of abnormal increases in uplift pressure can lead to the discovery of seepage paths that may cause damage to concrete arch dams. A new methodology has been developed in this study in order to analyze the causes of abnormally high uplift pressure increases and their influence on the structural safety assessments of dams. A series of borehole video tests were performed on an area of the Huaguangtan Dam and its foundations in order to investigate seepage phenomena under different working conditions. The reasons for the existence of the seepage paths causing abnormally high uplift pressures were identified by examining stresses on the dam, using a detailed three-dimensional numerical model. The results from the monitoring and on-site inspection showed that the high uplift pressure did not constitute a direct threat to the dam’s safety. However, grouting treatment of the existing cracks was recommended so as to prevent them from developing further within the dam’s foundations and to ensure the long-term stability of the foundation seepage. It was concluded that the methodology in this study could be used to solve practical engineering problems effectively as well as acting as a frame of reference for similar projects.
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