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Journal of Zhejiang University SCIENCE A 2009 Vol.10 No.9 P.1231~1240

http://doi.org/10.1631/jzus.A0820478


Nonlinear dynamic analysis of the Three Gorge Project powerhouse excited by pressure fluctuation


Author(s):  Cun-hui ZHANG, Yun-liang ZHANG

Affiliation(s):  School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China

Corresponding email(s):   zhangyl@dl.cn

Key Words:  Three Gorges Project (TGP), Hydropower house, Dynamic, Nonlinear, Damage, Pressure fluctuation


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Cun-hui ZHANG, Yun-liang ZHANG. Nonlinear dynamic analysis of the Three Gorge Project powerhouse excited by pressure fluctuation[J]. Journal of Zhejiang University Science A, 2009, 10(9): 1231~1240.

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Abstract: 
This study established a 3D finite element model for 15# hydropower house of the three Gorges Project (TGP) and performed a nonlinear dynamic analysis under pressure fluctuation. In this numerical model, the stiffness degradation in tension for concrete was considered on the basis of the continuum isotropic damage theory. Natural vibration frequencies of the damaged and undamaged structures were compared after static water pressure was applied. Then a study was further conducted on forced vibration of the powerhouse with pre-existing damages under pressure fluctuation that acts on the flow passage; displacement, velocity and acceleration of the important structural members were afterwards presented and checked. Numerical results show that tensile damages in concrete surrounding the spiral case only exert significant impact upon the dynamic characteristics of substructure but show little effect on the superstructure. Nevertheless vibrations of the powerhouse are still under the recommended vibration limits.

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