An Experimental Study for the Compression Strength of Hybrid CFFT Pile

Abstract

In this paper, we persent the results of on experimental investigations pertaining to the structural behavior of new type of concrete filled fiber reinforced plastic circular tubes (i.e., hybrid CFFT, HCFFT) which are suggested in order to mitigate the problems associated with the concrete filled steel-concrete composite tube (CFT) and the concrete filled fiber reinforced plastic tube (CFFT). It is found that when the HCFFT is used in the construction of pile foundation the HCFFT pile can transfer axial as well as flexural loads from the superstructure to the underground effectively in comparison with CFT and CFFT piles.

Compressive Strength Testing of Hybrid Concrete-Filled Fiber-Reinforced Plastic Tubes Confined by Filament Winding

“…FEA was performed by reflecting the size of the experimental member, standard design strength of concrete, and FRP thickness. The mechanical properties of the hybrid-CFFT obtained from a previous study [26] were applied, which are shown in Table 10. For the boundary conditions, all the lower surfaces of the analysis model were fixed.…”

Characterization of Flexural Behavior of Hybrid Concrete-Filled Fiber-Reinforced Plastic Piles

“…The research results of Choi et al [ 10 ] confirmed that the compressive strength of HCFFT is higher than that of CFFT because FFRP reinforced PFRP. The research results of Lee et al [ 11 ] confirmed that it is economical to design an FFRP with a thickness of 4.2 mm or less, and that the increase in strength decreases when it exceeds 4.2 mm.…”

“…The design of the cross-section of the HCFFT specimens was determined based on the results of compressive strength testing of CFFT obtained by Choi et al and Kang and Kim [ 10 , 12 ]. The geometry of the cross-section of HCFFT is illustrated in Figure 9 .…”

“…These previous studies suggest that most FRP-related studies have focused on the reinforcement effect of structures for repairing and retrofitting structures [ 9 ]. Based on the background described above, this study was conducted as a follow-up study to the research of Choi et al, Lee et al, and Kang and Kim [ 10 , 11 , 12 ]. In particular, this study aims to evaluate FRP-concrete composite piles (Hybrid-CFFT, HCFFT) with a dual structure of composite materials, also used in the marine environment, with excellent flexural performance.…”

“…In particular, this study aims to evaluate FRP-concrete composite piles (Hybrid-CFFT, HCFFT) with a dual structure of composite materials, also used in the marine environment, with excellent flexural performance. It was manufactured to maintain the advantages of CFFT proposed in previous research [ 10 , 11 , 12 ] and to secure sufficient structural performance regarding flexibility. In this regard, HCFFT were fabricated by modular pultruded FRP (PFRP) members with reinforcing fibers arranged in the axial and circumferential directions and reinforcing the exterior of the fabricated PFRP members with filament winding FRP (FFRP).…”