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3D-FEM Analysis on the Spiral Case Structure of Xi-Longchi Pumped-Storage Hydropower Station

Author: SunShaoJie
Tutor: KangJingFu
School: Tianjin University
Course: Structural Engineering
Keywords: Volute Finite Element Nonlinear Crack Keeping Internal Pressure
CLC: TV33
Type: Master's thesis
Year: 2007
Downloads: 90
Quote: 0
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Abstract


In recent years, with conventional units and pumped storage units tend to be large -capacity , high head , water-filled spiral case structure type applications in China and more and more , this steel liner and peripheral combination of reinforced concrete structures is a composite structure , a non- symmetrical shape of the structure , not only withstand the hydrostatic pressure with a certain amplitude and hydrodynamic pressure , but also bear the weight and maintenance of fixed equipment such as hydro-generating unit live load for such a structure and force are more complex structures , how to calculate , especially three-dimensional nonlinear computational analysis , is still not yet solved . Maximum dynamic head Xilongchi pumped storage power plant units up to 1015m, work force characteristics of the volute structure in such a high head is very concerned about the engineering staff . In this paper, ANSYS finite element analysis program , three-dimensional linear elastic and nonlinear full analysis of Pumped Storage , Xilongchi , power plant volute structure . Linear elastic calculations , analyzes the different holding pressure head under concrete steel volute and peripheral stress distribution law , studies have shown that concrete surrounding the spiral case volute cross-section of the ring to the tensile stress control stress , keeping constant pressure value the size of the stress state of the concrete surrounding the spiral case has an important influence ; proposed a reasonable holding pressure head of the engineering on the basis of comprehensive consideration of the features and characteristics of the force of the volute structure ; given final calculated results based on linear elastic peripheral concrete reinforcement program. Nonlinear calculations , through reasonable simulation of steel spiral case , steel and concrete , and the connections between them , the establishment of overall nonlinear finite element model , volute structure ; using the model Xilongchi Pumped Storage Power Station volute structure nonlinear analysis to study the cracking of the surrounding concrete of steel spiral case , the stress state of the crack distribution after cracking steel volute , reinforced , made ??a good predictor of the effect . Its conclusions only on the study the volute structural failure mechanism has the reference value, the theoretical significance of the design of similar projects .

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CLC: > Industrial Technology > Hydraulic Engineering > Hydraulic structures > Concrete and reinforced concrete structures
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