Bond-slip Relationship of Carbon Fiber Reinforced Polymer (CFRP) Plated Steel Member under Fatigue Loading

This paper intended to discuss in depth the provision of the groundwork for the development of bond-slip relationship of carbon fiber reinforced polymer (CFRP) plated steel member under fatigue loading. The bond-slip characteristics of the adhesive joint between the CFRP and steel have been studied under monotonic load so that debonding does not occur whilst the members are in service. A typical bond-slip relationship is assumed to be bilinear consisting of an elastic branch which peaks at τmax and the softening branch up to δmax. However there are relatively few studies on the bond-slip relationship due to fatigue loading. Thus this research focuses to study the behavior of this composite system by thoroughly examining the shear stress distribution along the bonded length. Experimental program using single lap pull test subjected to monotonic loading is carried out using CFRP plated steel block. Later, fatigue life prediction of the composite system is done using stress-life approach in order to come up with a suitable fatigue loading program. The output of this research will be a firm base for a good formulation of the bond-slip relationship under fatigue loading and therefore will enhance the knowledge of time-dependant behavior for steel bridges, steel jetty and offshore platforms retrofitting as well as the development of design standard for fatigue conditions.