2017 Vol. 3 No. 1: 3 Research Article DOI: 10.4172/2471-9935.100018 iMedPub Journals http://www.imedpub.com 1 © Under License of Creative Commons Attribution 3.0 License | This article is available in: http://polymerscience.imedpub.com/archive.php Polymer Sciences ISSN 2471-9935 Ridha MS Structural Engineering, University of Technology, Iraq Corresponding author: Maha MS Ridha [email protected] Associate Professor, Structural Engineering, University of Technology, Iraq. Tel: (964) 79 01592170 Citaon: Ridha MS. Axial-Flexural Interacon of Square FRP Tube Columns In-filled with Ultra-High Performance Concrete. Polym Sci. 2017, 3:1. Introducon In recent years, concrete-filled fiber-reinforced polymer (FRP) tubes have provided an aracve use of hybrid materials in several structural applicaons such as piles, columns, and bridge piers where the FRP tubes provided a permanent, noncorrosive, lightweight formwork for concrete and reinforcement element at the same me. Several researcher have studied the structural behaviour of convenonal concrete-filled FRP tubes under concentric axial loads [1,2], flexural loading [3,4] and combined P-M loading [5,6]. Ultra-high performance concrete is a new construcon material with exceponal properes such as higher strength, deformaon capacity and toughness than convenonal concrete. These superior materials properes are achieved due to low-water-cement rao and presence of steel fibers which results to higher compressive strength (e.g. up to five mes that of convenonal concrete), higher tensile strength (e.g. up to ten mes that of convenonal concrete), and much greater duclity than convenonal concrete [7]. Considering the excellent material properes of UHPC and FRP, Zoherevand and Mirmiran [8] developed a hybrid column made of a FRP tube filled with UHPC within the plasc hinge length and convenonal concrete for the residuum of the length of column. The column was without steel reinforcement and tested under reverse cyclic lateral loading. The results showed significantly higher flexural strength, lower residual driſt, and similar energy dissipaon, as compared to convenonal concrete column with steel reinforcement. Recently Zoherevand and Mirmiran [9] studied the seismic response of hybrid column made of a FRP tube filled with UHPC. The maximum ground acceleraon capacity of five UHPC-filled FRP tubes and one reference concrete column was esmated based on the pseudo-stac test. The results showed 20% higher maximum ground acceleraon capacity for the UHPC-filled FRP tube, as compared to its reference concrete column counterpart. However, more than a decade of studies on UHPC, few research are available about the behaviour of FRP confined UHPC columns under monotonic loading that contained no convenonal reinforcement, either in the longitudinal or transverse direcon. Moreover, no research data has been published dealing with steel-reinforced UHPC columns confined by FRP and subjected to P-M loading. To this end, the present research is aimed to Axial-Flexural Interacon of Square FRP Tube Columns In-Filled with Ultra-High Performance Concrete Received: May 03, 2017; Accepted: May 17, 2017; Published: May 27, 2017 Abstract More than a decade of studies have shown the benefits of ultra-high performance concrete (UHPC) on a duclity, energy absorpon, crack distribuon, damage tolerance, and deformaon capacity. Nevertheless, lile informaon is available on the behavior of UHPC columns especially when confined with fiber-reinforced polymers (FRP). This paper presents the results of experimental program and analycal modelling for performance evaluaon of square FRP tubular columns in filled with UHPC under axial-flexural (P-M) loading. Eight steel–reinforced UHPC specimens were tested. Four had FRP tubes and subjected to inial load eccentricity 0, 10, 85 and 95 mm. Three reference columns without FRP tube and subjected to inial load eccentricies 0, 10, 85 mm. The last one had FRP tube and subjected to pure bending. P-M interacon diagram of FRP tubular columns in filled with UHPC were drawn using the obtained experimental results and compared against theorecal P-M interacon diagram that based on the principles of ACI building code. Good agreement between experimental and theorecal results was observed with COV 5.9%. Keywords: Columns; Fiber-reinforced polymer; Ultra-high performance concrete
Axial-Flexural Interaction of Square FRP Tube Columns In-Filled with Ultra-High Performance Concrete
Jun 24, 2023
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