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Zhang L.-J.,Hohai University | Zhang H.-Y.,Hohai University | Ji Y.-X.,Shanghai Water Engineering Design and Research Institute | Hu S.-W.,Nanjing Hydraulic Research Institute
International Journal of Structural Stability and Dynamics | Year: 2014

The mutation of mass and stiffness between the superstructure and substructure of a hydropower station can lead to the whiplash effect on the hydropower house during an earthquake. This paper explains the mechanism of the whiplash effect based on the theory of structural dynamics. A Chinese hydropower house was taken as a test case to discuss the whiplash effect on this type of structures. An integral finite element model and partial models of the hydropower house were established according to its structural features, arrangement forms and loading features. The dynamic response and the whiplash effect of the hydropower house were investigated by direct time integration using the Newmark method. © 2014 World Scientific Publishing Company. Source

Tong H.,Hohai University | Tong H.,Shanghai Qing Cao Sha Raw Water Engineering Co. | Pan L.,Shanghai Water Engineering Design and Research Institute
Earth and Space 2012 - Proceedings of the 13th ASCE Aerospace Division Conference and the 5th NASA/ASCE Workshop on Granular Materials in Space Exploration | Year: 2012

When the large width closure gap need to be completed under the condition of rapid flow and limited construction period, gap closure work becomes one of the most difficult construction part of all the whole Qingcaosha reservoir dike project. Considering the huge engineering quantity and complex hydrology of such engineering during construction phase, the real-time monitor, analysis and prediction of the hydrology are implemented. With numerical analysis of the closure gap under the design tide process, the model results show that the rising flow of the closure gap is more rapid than the ebb flow, and the maximum current speed caused by water level difference between the internal and external is mostly located at top slope corners of the gap protection layer. From the result of observation and calculation, the local maximum current speed was about 4.0m/s and experienced a short time due to small tidal range, which is suitable for construction. To sum up, it is feasible and helpful to combine the real-time observation with numerical analysis to ensure the safety in construction during the closing of the closure gap. © ASCE 2012. Source

Yuan W.,Shanghai Water Engineering Design and Research Institute
ICPTT 2014 - Proceedings of the 2014 International Conference on Pipelines and Trenchless Technology | Year: 2014

EPANET as a network modeling software is widely used in water pipe network design, operation and management. However, due to lack of pipe diameter property when importing from CAD network topology, the pipe network modeling efficiency has been restricted. EXCEL VBA function is known as easy to learn. A program of automatic assignment procedure for pipe diameter of the water network based on VBA is given in the present work. It is easy to understand, and greatly enhances the efficient of network modeling. EPANET INP file is used to be a data processing carrier. Make use of VBA functions for data search and calculation and improve software coupled to solve practical engineering problems. It helps to develop and progress water pipe network model, design, operate and management. © 2014 American Society of Civil Engineers. Source

Yuan W.,Shanghai Water Engineering Design and Research Institute
ICPTT 2014 - Proceedings of the 2014 International Conference on Pipelines and Trenchless Technology | Year: 2014

The concept of DBS is introduced to water supply network planning stage. Based on natural conditions and combine the situation of pipe network layout, the DBS methods and principles are discussed. According to hydraulic model, the DBS planning programs, which have been assessed by EPANET 2.0, satisfies the water security. Compared with the traditional planning programs, the implementation of DBS in planning period can save construction costs. The paper attempts to enhance the water supply network planning and design standards, improve the water network management and operational levels. © 2014 American Society of Civil Engineers. Source

Yuan W.,Shanghai Water Engineering Design and Research Institute | Liu S.,Tongji University
14th Water Distribution Systems Analysis Conference 2012, WDSA 2012 | Year: 2012

The objective of present work is to investigate air transport in water supply pipeline Tjunction. A three-dimensional computational fluid dynamics (CFD) model using volume of fluid (VOF) method is presented for predicting the evolution of phase distributing, air and water interaction, as well as distribution of air amount in downstream sections using a CFD package. Air and water transport processes was calculated for type A and type B pipeline T-junctions with diameter of 100mm in 8 cases. The result reveals that T-junction type effects air split into downstream sections and positions of stagnant areas. The interaction of air buoyancy and flow inertia force is the mainly reason for secondary flow phenomenon in downstream sections. The distribution of air enters downstream sections can approximate equal to the ratio of outflows of downstream sections. Copyright © (2012) by Engineers Australia. Source

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