STUDY ON FATIGUE DURABILITY OF STEEL DECK REINFORCED FROM UNDERSIDE WITH CFRP MOLDINGS AND LIGHTWEIGHT RESIN MORTAR

Abstract

 During fatigue damage to the steel deck, fatigue cracks propagate starting from the U-rib welds. As a countermeasure against such fatigue damage, SFRC pavement construction is a standard construction method. However, lane regulation is required and causes traffic congestion. Therefore, we are considering a reinforcement method using lightweight resin mortar filled in the U-ribs and CFRP molded material pasted between the U-ribs as a reinforcement method from the bottom of the steel deck slab. In this study, we performed a steel deck specimen with three U-ribs, filled the U-ribs with lightweight resin mortar, secondary injection of resin, and pasted CFRP molding material between the U-ribs. The reinforcement effect and durability were confirmed through the moving wheel trucking test.