Study On Ductility And Design Method Of High Piers

With the implementation of Western Development Strategy, a number of highways and railways are being built or planned to build in West China. But because of the limitations of the geological conditions and landform, thess lines must sometimes spanning gulley danger gully,so the bridge with high piers become an indispensable part of the lines. And the bridge with high piers are usually belongs to the typical irregular girder bridg, seismic design criteria home and abroad are unavailable for these bridges. In order to guarantee the safety of this bridge in earthquake, the ductility performance and seismic design method are studied in this dissertation.The main contents are as follow:â‘ Based on hollow column that common used in engineering, the influence of axial compression ratio, longitudinal reinforcement, constraint stirrups, concrete strengh and other factors on the piers'moment-curvature was analyzed. Furthermore, curvate ductility coefficient of the cross section under different circumstance was compared, and then got the influence of the several factor on the ductility performance of the hollow thin-walled pier.â‘¡The model was analyzed by Pushover method with different lateral force distribution patterns in order to get the capacity curves, and then compare the difference among them.â‘¢Compared the capacity curve analyzed by Pushover with that analyzed by IDA, then yield displacement and ultimate displacement were calculated through the two methods, in order to analyze the influence of height of the pier and calculate method on the result.â‘£Ordinary process and realization principle of seismic performance evaluated by capacity spectrum method were introducted, and then assessed seismic performance of several models using the method.