Composite Action Between Steel Girder and Precast Concrete Considering Haunches/Mortar and Stud’s Geometrical Configurations

Abstract

Due to deterioration and damages of existing RC decks for steel girders in Japan, redecking to PCaPC deck is significantly increasing under limited budget and construction period. By considering cover concrete and arrangement of PC cables and rebars, it needed to design superstructure as a non-composite steel girder after redecking, strengthening of the main girder tends to increase. To restrain strengthening of the main girder, it should be urgently clarified composite action between a deck and a main girder jointed by headed studs. Authors conducted a push-out test for RC and PCaPC deck considering geometrical configuration at the field, such as haunch and thin layer mortar. From the experimental results, it is found that cracks of thin mortar layer of PCaPC specimen might lead deterioration of the shear resistance partially, however, its yield strength could be similar to that of the RC specimen. It is also found that composite action between concrete slab and a girder by headed studs for PCaPC deck could be expected as the same as that of RC deck, considering the relative slip at the stud position and its regions’ slip. Furthermore, it is confirmed that the arrangement and the number of studs will affect the yield strength of composite structure consisted by thin mortar layer which is connected by the studs.