Seismic Design of Partially Concrete-filled Steel Box Bridge Piers

摘要

This paper deals with seismic design of partially concrete-filled steel box bridge piers. The basic characteristics of the thin-walled steel tubular bridge piers are noted and the importance of concrete fill in improving strength and ductility capacity of such piers is explained. A seismic design method for ultimate strength and ductility evaluation of concrete-filled, thin-walled, steel box bridge piers is presented. The application of the method is demonstrated by comparing the computed strength and ductility of some bridge piers with test results. The method is applicable for both the design of new, and retrofitting of existing, thin-walled steel box bridge piers. The effects of some important parameters, such as width-to-thickness ratio, column slenderness ratio, height of infill concrete and residual stress, on the ultimate strength and ductility of thin-walled steel box bridge piers, are presented and discussed.