Degree of composite action verification of bolted GFRP bridge deck-to-girder connection system

There are modes to connect GFRP deck and girder, which have been adopted as systems worldwide: connection system using shear connector; mechanical connection systems using bolt or clamp; and also there has been a study on a system to connect GFRP deck and steel girder using bonding agent recently. In this paper, the degree of composite action for the bolt connection system, one of the mechanical connection systems of such connection systems, is experimentally verified by static test. And also the relevancy between neutral axis changes and bolt connection system is analyzed by comparing the theoretical neutral axis with the neutral axis extracted from the test result for the degree of composite action calculation.