Preliminary Study On Ductile Seismic Design Of Continuous Beam Bridges In High Seismic Intensity Zone

In recent years,because of the demands of non-linear behavior assessment of the structures under seismic load, non-linear analysis of bridge structures becomes necessary. Ordinary bridge obeys a basic principles of seismic design to allow a certain degree of injury and not collapse, in order to control and estimate the damage, It is necessary to analyse the post-elastic non-linear behavior of the structures.Ductile seismic design of structures, from the beginning to the present, has a history of about 50 years. But so far, for the ductile seismic design theory and practice, there are still some issues that have not been solved,especially in our contury. Because we have adapted the ductile seismic design method for a reletively short time in China, some of the basic concepts remain vague for many engineers.So there is a need to do some case studys about that issue.In this paper, some basic design issues of ductile seismic design of structures have been discussed and studyed,a case study of ductile seismic design of a Continuous beam Bridge has also been given.The contents of this paper are as follows:(1) Ductile seismic design theory and basic ideas of highway Bridges have been introduced and discussed in detail.(2) The procedure and design process of ductile seismic design of bridges have also been discussed in detail,and the moment-curvature analysis software has been developed,then compare with mature software.(3) On the study of continuous girder bridge in high seismic intensity zone, ductile seismic sesign of piers of continuous beam bridges has been executed and orientation combination of Seismic response problems has been discussed.(4) The influence factors of the ductility performance of bridge piers such as the axial compression ratio, hoop rate and longitudinal reinforcement ratio have been studyed and compared.