Seismic Response Analysis Of Arch Dams Under Oblique Incidence Of Seismic Waves

After the reform and opening,the development of water conservancy and hydropower in China has experienced a period of prosperity,construction of large water conservancy facilities.But the earthquake disaster in our country is frequent and widely distributed,if a violent earthquake occurs,it will be a great loss.In this background,the seismic response analysis of the importance of hydraulic structures is particularly important.Analysis of the main seismic wave vertical incidence of the earthquake response of the dam,but in real life,the direction of the incident seismic wave is not perpendicular to the incident,there may be a certain angle of inclined incident earthquake wave is obviously for the significance of the analysis of seismic response of arch dam.For the response of inclined seismic wave of arch dams,this paper established the finite element model of arch dam,seismic wave input,different incident angle analysis of influence,and looking for arch dam oblique seismic waves under the most unfavorable incident angle.(1)Research on using finite element method to solve the problem of near field wave,learn to define and set up artificial boundaries,studied Wave input method of viscoelastic artificial boundary in the finite element.Focus on the analysis of the equivalent boundary force method and wave field decomposition method of the two kinds of exogenous input method,so that after the procedure to achieve wave input,and study how to reasonably use the spring damper element in ADINA software to analyze the structure in the realization of viscoelastic artificial boundary.Looking for the realization method of the seismic wave obliquely incident on a simple,in this method,the oblique incident seismic wave is decomposed into along the river and cross the rive vibration,in order to realize the software,and the result is representative.(2)Based on the structural characteristics of the arch dam and the present theory and method of arch dam seismic analysis,the finite element model of the arch dam is established in ADINA finite element software.Analysis of the effect of oblique incidence of seismic wave on the seismic response of arch dams.Select the curves of iconic reference points on the dam body and foundation displacement when compared,Analysis of the influence of different incident angle of arch dam X and Y direction of displacement response.Selection of dam body and dam foundation on the iconic reference point of the main stress time curves were compared,analysis of the influence of stress response of different incident angles on the arch dam.The results show that the oblique incident wave will affect the seismic response of arch dams.(3)After the conclusion that the oblique incidence of seismic wave will affect the seismic response of the arch dam,Study on seismic response of arch dams under different incidence angles,Analysis of the maximum displacement under different incidence angles of the reference point and the maximum principal stress.Based on the data of the chart,the stress nephogram and the comprehensive analysis,obtain the most unfavorable angle of incidence of the arch dam under oblique incidence of seismic wave.The conclusions can provide some reference value for the seismic design of hydraulic engineering.