Seismic Response Factors Analysis Of Bank-Tower Hydroelectric Power Station Intake Tower

Reservoir's 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 tower's safety of the earthquake is more important. Before, the interactions between the foundation-intake tower-the hill on the back are studied little about the aseismic analysis of high-rise intake tower. Usually intake tower is separated from surroundings and the hill, to simulate the effects of surroundings by making use of the spring element. But so the effects of surroundings are simplified much more. On the analysis of intake dynamic characteristic, opening and closing or sliding of the contact joints between the foundation-intake tower-the hill will happen during earthquakes in reality, which will release stresses and redistribute forces. The contact joints play an important role in the nonlinear response of intake tower during earthquakes. In this paper, by introducing dynamic contact joints, by means of time-history analysis approach,base on numerical tests, the influence research of every factor to the intake tower dynamic response is done respectively. As a result, some qualitative and quantificational conclusions are got.There are 4 conclusions in this paper as follow:(1) Summed up the method of existing on aseismic behavior analysis of intake tower. Considering the interactions between the foundation-intake tower-the hill during earthquakes in reality, introduced dynamic contact joints on the weaknesses between the foundation-intake tower-the hill, to simulate the process of opening, closing and sliding on the weeknesses.(2) A series of numerical tests are designed and practiced. Based on the numerical test results, the influences of parameters, such as foundation property, rigidity of superstructure, high-span ratio, altitude of keypoint, on dynamic characteristics, seismic response of Soil-Structure-Interaction (SSI) containing natural frequency, displacement, velocity, acceleration are discussed.(3) A series of numerical tests are designed and practiced. Based on the numerical test results, the influences of parameters, such as foundation property, rigidity of superstructure, high-span ratio, altitude of keypoint, on seismic response of SSI containing contact gap distance and contact pressure are discussed.(4) Applying the method of using dynamic contact joints to simulate the interactions between the foundation-intake tower-the hill to project in reality. Taking example for the aseismic behavior analysis of intake tower of Zipingpu, it introduced detailedly the application and approach of this method. The practicability of this method is estimated.