Fatigue Behavior of Concrete-Filled Fiber-Reinforced Polymer Tubes

Abstract

AHMAD, IFTEKHAR. Shear Response and Bending Fatigue Behavior of Concrete-Filled Fiber Reinforced Polymer Tubes. (Under the direction of Amir Mirmiran.) Recent field applications and research findings have demonstrated the effectiveness of concrete-filled fiber reinforced polymer (FRP) tubes (CFFT) as an efficient and promising hybrid system for designing main components such as pier columns, girders and piles for a bridge system. The vision was to provide a cost-competitive unified system composed of FRP/concrete hybrid members, which may act as a viable alternative to conventional reinforced and prestressed concrete structural systems. To achieve their broad-based implementation in civil infrastructure, understanding of their behavior and developing analytical tools under full spectrum of primary and secondary load demands are essential. Response characterizations under primary load demands namely, axial compression, flexural and axial-flexural, and seismic loadings have already been reported. However, investigations under primary shear and secondary fatigue load demands remain to be addressed. The present study consists of two phases. In the first phase, an experimental and analytical investigation was undertaken to characterize the behavior of a CFFT beam. Study on shear was primarily focused on the deep beam behavior. Comparisons of behavior of deep, short and slender beams were also highlighted. A strut-and-tie model approach, pertinent to analysis of deep reinforced and prestressed concrete members, was proposed to predict the shear strength of deep CFFT beams. Prediction showed good agreement with test results. It was concluded that shear failure mode is only critical for beams with shear span less than their depth.

Experimental investigation of the behavior of concrete‐filled high‐strength glass fiber‐reinforced polymer tubes under static and cyclic axial compression

“…As a result, glass fibers are more commonly used in the pultrusion industry where the corresponding pultruded FRP profiles are typically referred to as glass fiber reinforced polymer composites (GFRPs). GFRP profiles have been used in their hollow form or in-filled with concrete for various applications in the construction industry such as load-bearing members for bridge decks, 20 bridge girders, 21 bridge columns, 22 flexural structural elements, 23 and more widely for fender piling in marine structures. 24,25 Several studies have been devoted to investigate the structural behavior of hollow and concrete-filled GFRP tubes under different loading conditions including flexural, 9,26 shear, 27,28 pure compression, 10,29 concentric and eccentric axial, 30,31 impact, 32 and seismic lateral loading.…”

Seismic Performance of Hybrid Fiber Reinforced Polymer-Concrete Pier Columns

“…The responses of typical CFFT columns to three representative earthquake records are also investigated. (Mirmiran et al 1997a, Fam et al 2001a), axial-flexural (Mirmiran et al 1999a(Mirmiran et al , 2000bFam et al 2002), deep beam shear (Ahmad et al 2008a), reverse cyclic (Shao et al 2005b, Zhu et al 2006a) and fatigue loading (Ahmad et al 2008b, Helmi et al 2006, 2008, as well as long-term creep and shrinkage (Naguib et al 2002), transient loading of impact (Zheng 2007), and other conditions such as freeze and thaw (Fam et al 2008a). …”