DEVELOPMENT/SPLICE STRENGTH OF STEEL BARS IN CONCRETE CONFINED WITH CFRP SHEETS

摘要

The aspect of bond between reinforcing steel bars in tension and concrete confined with flexible carbon fiber-reinforced polymer (CFRP) sheets is analytically investigated. The bond analysis incorporates an experimentally derived local bond stress-slip model, applicable for both plain unconfined concrete and concrete confined with CFRP flexible sheets. It is found that confining the concrete with CFRP reinforcement increases considerably the bond strength and leads to significant improvement in the ductility of bond failure. Based on the analysis results, supported with experimental data, a design expression is proposed to evaluate the development length of reinforcing bars embedded in concrete confined with CFRP flexible sheets.