Analysis Of Seismic Response And Seismic Control Of Long-span Cable-stayed Bridges

For its great spanning capacity, novel structure and other unique advantages, Cable-stayed Bridge has attracted great attention of bridge engineering field and has developed rapidly both at home and abroad. As an important part of transportation hub engineering and lifeline engineering, Long-span Cable-stayed Bridge would bring to greater loss of life and property if it were destroyed in earthquake. Therefore, it becomes important to have a comprehensive and systematic study of the seismic performance of Long-span Cable-stayed Bridge. This paper takes kilometer-scale Cable-stayed Bridge as a study object and has studied its seismic response and seismic control measures by the starting point of dynamic analysis.By using the finite element software, dynamic analysis model is established. This article explores the impact of Cable-stayed Cable Damage on the Dynamic Characteristics of the full-bridge during the life of Cable-stayed Bridge. It has obtained the law of the influence of symmetry and asymmetry Cable-stayed Cable Damage on the Dynamic Characteristics of the full-bridge. It analyses the influence of nonlinear factors on the seismic response of Cable-stayed Bridge. It comes to the conclusion that when you evaluate the seismic performance of Cable-stayed Bridge, you should take the significant effect of nonlinear factors on seismic response of Cable-stayed Bridge into consideration. In this paper, the author calculates the response of Cable-stayed Bridge under uniform excitations and multiple-support excitation (traveling wave effect) seismic load and gives comparative datas. It draws a conclusion that long-span structures need to consider the influence of multiple-support excitation (traveling wave effect). Finally, the article also describes the basic mechanical principles of viscous damper and takes a sensitivity analysis of two key parameters of the viscous damper. It tries to find the optimum parameter value and gives the time histories of internal forces and displacement in the key position under the best damping effect.This paper concludes that when you evaluate the seismic performance of Cable-stayed Bridge, you should take nonlinearity and traveling wave effect into account; and that viscous damper can be used as a damping device and that Cable-stayed Cable Damage has some influence on the Dynamic Characteristics of the full-bridge.