STUDY OF LONGER CONTINUOUS COMPOSITE TWO I-GIRDER BRIDGES UTILIZING THE BRIDGE HIGH PERFORMANCE STEELS

Abstract

Feasibility study of the longer continuous composite two I-girder bridges was done utilizing the Bridge High performance Steels (BHS) in combination with the conventional steels. First, allowable unit stress and minimum plate thickness of steel girders were formulated. Then, the difference between the BHS and the conventional steels on local buckling of flanges and on lateral buckling of the girders was clarified and structural characteristics and cost effectiveness were investigated based on the outline design of actual bridges. Finally, problems of the longer continuous composite two I-girder bridges using the BHS were examined and necessary means against these problems were proposed.