Study On Seismic Performance Of Intake Tower Based On Endurance Time Method

With the development and progress of water conservancy science and technology,the problem of high reservoir dam is solved with ease,and the corresponding hydraulic structures are also rising higher and higher.As an important water intake structure in the dam,part of the tower is located under the water surface for a long time and the stress condition is complicated and changeable.Because the intake tower structure is mostly high-rise buildings,the accident after the earthquake will cause serious impact on the operation of the whole power station,so it is of great significance to study the seismic resistance of the intake tower.This paper takes an actual engineering intake tower structure as a model to compare and verify the rationality and applicability of seismic time-history analysis method in the study of seismic performance of the intake tower,and carries out seismic vulnerability analysis of the intake tower in combination with the structural vulnerability theory.The main research contents are as follows:(1)the time history analysis of the intake tower for the combined use of emerging of aseismic analysis method,the seismic time history method,based on its core theory,is visualization with the MATLAB software programming,implement different response spectrum of synthetic seismic time history curve,and the seismic design of hydraulic structures in our country the standard response spectrum parameters as input and generates a 3 artificial seismic time history curve of incentives,The relative errors between response spectrum and target spectrum in different time periods of the curve are analyzed,and the fast loading of high intensity earthquake is realized.(2)According to a practical project,the finite element model of the intake tower and foundation is constructed.The seismic performance of the structure is calculated by the incremental dynamic analysis method and seismic time-history analysis method,and the structural dynamic response under horizontal seismic input along the river and the structural dynamic response under three-direction seismic input are analyzed.By studying the difference between seismic time-history analysis and the response of multiple seismic waves under the given acceleration of response spectrum,the feasibility of seismic time-history theory on the intake tower structure is verified.(3)Combined with the seismic vulnerability analysis theory of the structure,the vulnerability analysis method of the intake tower based on the seismic time-history method is constructed.The three-direction seismic time-history excitation curve is applied to the intake tower structure,and the damage history distribution of the tower structure under the action of the three-direction seismic time-history curve is given.Through displacement ductility coefficient definition applies to the destruction of the model level standard,and then analyzes the failure probability of structure under the effect of different earthquake intensity,compared with the traditional analysis method,the seismic time history analysis of vulnerability curve with the strength of the failure probability significantly increased,shows that under the action of the seismic time history curve,the earthquake response of structure is more intense.