Research On Seismic Response Of Small And Medium Span Beam Bridges

Small and medium span girder bridge is a kind of common bridge and its seismicdesign theory is not perfect. In order to guarantee the safety of the structure, it isnecessary to consider the particularity of this kind of structure. On the basis ofpredecessors’ research results, study the seismic response characteristics of small andmedium span continuous girder bridge and main research content is as follows:(1) Combining with the existing research results, summarize the current mainanalysis method used in bridge structure seismic response to provide theoretical supportfor the following research work. Combining with the finite element model to discuss theseismic analysis simulation method of bridge members.By comparing the contact ofsite classification method between Chinese norm and American NEHRP norm,introduce the method of Picking up seismic waves from the Pacific earthquakeengineering center earthquake database.(2) Research on the seismic response of the bridge structure which With differentsets of bearing and the pier cross-section form.By finite element analysis,contrast thedynamic characteristics of structures.Using dynamic response spectrum method andtime history method, contrast and analyze the elastic and elastic-plastic seismicresponse of bridge structure which use different combination forms of bridge pier andbearing. Contrast and analyze the deformation and stress of Bridge piers and maingirder bending moment, and combine with existing bridge seismic code to calculate thebearing force and deformation.Considering the dynamic characteristics, elastic seismicresponse, elastic-plastic seismic response, bearing force and deformation of eachscheme, finally get the best combination.(3) Using time history analysis method, research the seismic responses of smalland medium-sized span continuous girder bridges which with different height ofpiers.Seismic response of the bridge structure was calculated by FEM, the followingfactors were considered, two kinds of bearing arrangement, different site conditions anddifferent seismic wave amplitude values. Through the calculation, the influences of the factor to the seismic response were acquired.