EXPERIMENTAL STUDY ON LOAD CARRYING CAPACITY OF COMPOSITE HYBRID STEEL BOX GIRDER WITH RC/SW SLAB USING HIGH PERFORMANCE STEEL

Abstract

In general, the hybrid girder consisting of different grades of steels for the web and the flange is superior in the cost to the homogenous girder consisting of same grades of steels. However, for the hybrid girder, the width to thickness ratio of web is required to be smaller than that for the homogeneous girder because of yielding of web before flange yields. In this study, proposed is the composite hybrid girder with newly developed high performance steel, in which the web and the upper flange are made of the normal grade steel, but the lower flange is by the high performance steel. It is demonstrated experimentally that by making the width of rectangular box section narrow and combining the hybrid girder with RC/SW slab, the web can be a non-stiffened thinner plate with the large width to thickness ratio, so that the proposed girder system can contribute the cost reduction.