Influences of Slenderness and Eccentricity on the Mechanical Properties of Concrete-Filled GFRP Tube Columns.

Hongbo Guan,Yifei Xia,Arsene Hugo Mbonyintege,Jinli Wang

doi:10.3390/polym13172968

Abstract

The existence of either eccentricity or slenderness has a significant effect on the mechanical properties of a structure or member. These properties can change the working mechanism, failure mode, and bearing capacity of the structure or member. A concrete-filled, glass fibre-reinforced, polymer tube composite column has the same problem. We carried out experiments on the influences of eccentricity and slenderness on the mechanical properties of concrete-filled, glass fibre-reinforced, polymer tube composite columns. The experimentally recorded stress–strain relationships are presented graphically, and the ultimate axial stresses and strains and the FRP tube hoop strains at rupture were tabulated. The results indicate that the influences of slenderness and eccentricity on the composite columns were significant with regard to the axial strain, hoop strain, ultimate bearing capacity, lateral displacement, and failure mode. Based on the existing research literature and the results reported in this paper, the bearing capacity formula of a composite slender column under an eccentric load was established. The theoretical results were in good agreement with the experimental results.

Highlights

Polymers 2021, 13, 2968. https://Over the past couple of decades, fibre-reinforced polymer (FRP) composites have found increasingly more applications in civil engineering due to their high strength-toweight ratios and high corrosion resistance [1,2]
This paper reports the results of an experimental investigation into specimen slenderness and eccentricity on the compressive behaviour o
Based on the results and discussion presented in this paper, the followin be drawn: Specimens with low slenderness ratios often failed with continuou

Summary

Introduction

Over the past couple of decades, fibre-reinforced polymer (FRP) composites have found increasingly more applications in civil engineering due to their high strength-toweight ratios and high corrosion resistance [1,2]. The concrete-filled FRP tube (CFFT) was introduced for efficient use of FRP reinforcement for new columns. Concrete-filled FRP tubes (CFFTs) provide a new and attractive way to use composite materials for several applications, including piles, columns, bridge piers, poles, and overhead highway sign supports. FRP plays an important role in these structures by providing lateral confining pressure that controls the volumetric expansion of the concrete to increase their ultimate load capacities and enhance their structural ductility

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