The Seismic Analysis And Stability Research Of Structure Of Intake Tower

Intake tower, as a sort of waterpower engineering, have complicated figure structure, boundary conditions and load situation. They generally have concrete thin wall and empty abdomen form, are built in the reservoir close to the bank and joined with the bank by working bridge on the top. Intake tower supports water pressure all around. So the safety of the earthquake of the tower is more important. The intake tower structure is the first portion of the underground water diversion system, whose seismic security concerns the safety and benefits of the entire hydropower station.In high seismic intensity zone, the questions of the interactions between the foundations, the intake tower, the mountain and water are very complicated, due to complex structure and boundary conditions of the intake tower. Based on the practices of a intake tower, a three dimensional finite element model was established, and the free vibration characteristics of the intake tower structure was studied.Main contents of this paper are shown as follows:(1) The intake tower’s finite element model has been built and dispersed. It can simulate the true transformation process about the tower’s displacement and stress.(2) Discussing the influence that the vibration characteristics of the intake tower. Finally giving the evaluation of the structure for its seismic performance, the responding problems of static dynamic load of structure are solved. Dynamic analysis and modal decomposition response spectrum method are used for dynamic analysis of the seismic calculation of the tower. The results conform to the reality and show that the stress and deformation of the tower simulation calculation is successful.(3) This thesis introduces systematically current developing situation of hydraulic engineering and static-dynamic load analysis theory and FEA theory. Various types of load conditions specified the influent stress on the role and contribution of their boats’ main and secondary status, would provide a reliable results for the engineering design. In this paper, I considered the above factors and applied different methods calculation. For in the dynamic area, I completed the dynamic properties analysis and analysis the tower in the horizontal direction and the vertical direction’s the earthquake. The spectral analysis was adopted to analyze the dynamic response of the intake tower structure under seismic load and evaluate the seismic behavior by superimposing the calculation result under static load and seismic load. The results showed that the deformation and strength of the intake tower can satisfy seismic requirements.(4) The results of sliding stability, anti-floating stability and against overturning carrying capacity of intake structure are calculated and analyzed in ultimate limit state,so it is the floor and bedrock. The results meeting the requirements show that design is reasonable and safe.