Fuzzy Reliability And Aseismic Analysis Of Hydroelectric Power Station Intake Tower

Because of its terrain conditions, China’s hydropower resources are mostly concentrated in the southwest region. According to statistics, more than70%of the hydropower resources are grouped in the western region, where earthquakes are in high frequency, thus the security of hydropower station has become a great concern in that region. Especially after the tragedy of Wenchuan earthquake, has given the designers a warning of the seismic design of the hydropower station. Compared to the underground structures of the hydropower station, the seismic capacity of ground structures is weaker, mostly when intake towers of the waterpower station reach into a high-rise structure, which can cause a more serious damage in an earthquake. Therefore, the seismic performance and stability of intake towers of the waterpower station has become an important content of the design and research. This paper takes the view of the above problem, applying the relevant theories in finite element and reliability, through ANSYS analysis software to make research and analysis about the seismic performance and sliding reliability of intake towers of the waterpower stations in the following aspects:(1) To establish a three-dimensional finite element model. A semi-infinite foundation and rock slope are simulated in a massless foundation model, and the sides and bottom edges of the batholith are controlled by the method of normal displacement. To apply the response spectrum method to analyze the self-vibration characteristics of intake towers, and combining with the calculating results from the static response to evaluate the seismic performance of intake towers.(2) To consider the effects of the water body to intake towers during the earthquake process as a form of attached mass, and calculate the static stability of intake towers, the stability under the circumstances of the static and dynamic combination and the stability of the dynamic time-history analysis. And summarizing the results of various calculating methods in regard to the amendment to the structural design of intake towers and completing the optimization of their structure.(3) To consider the indistinct properties of the rock cohesion and friction coefficients, and take the calculating results of the finite elements into the performance function, and through the point checking method of FOSM to make the research calculation about the indistinct reliability of the anti-sliding stability of the intake towers. As the improvement and supplement to the stability calculation of intake towers.