Paper number 1364

CREEP, STRESS RUPTURE, AND BEHAVIOR OF A DUCTILE HYBRID FIBER REINFORCED POLYMER (D-H-FRP FOR CONCRETE STRUCTURES

Francis P. Hampton¹, Frank K.Ko², and Harry G. Harris³

1Department of Civil and Architectural Engineering, Drexel University
Philadelphia, Pennsylvania, 19104, USA
2Department of Materials Engineering, Drexel University
Philadelphia, Pennsylvania, 19104, USA
3Department of Civil and Architectural Engineering, Drexel University
Philadelphia, Pennsylvania, 19104, USA

Summary

Reinforced concrete (R/C) structures especially pavements and bridge decks that constitute vital elements of the infrastructure of all industrialized societies are deteriorating prematurely. Structural repair and upgrading of these structural elements has become a more economical option for constructed facilities especially in the United States and Canada. The tensile strength, creep-rupture, and energy absorption capacity of a second generation ductile hybrid FRP reinforcement has been demonstrated at Drexel University in the form of a ductile hybrid bar (D-H-FRP) which simulates the stress-strain characteristics of conventional steel reinforcement. The effects of similitude from fiber to braiding geometry were investigated for proper enlargement of the D-H-FRP bars. The D-H-FRP bar exhibits a bilinear stress-strain behavior, which shows significant material toughness for all bar sizes. The long-term viscoelastic effects (creep) show excellent life-cycle design capabilities. Finally, the D-H-FRP shows significant energy absorption under reverse cyclic loading, a crucial concern for reinforced concrete (RC) structures, especially those subjected to earthquake loading.

Keywords

FRP, hybrid, ductility, reinforced concrete, translation efficiency, tensile strength, creep/stress rupture, energy absorption.