Abstract
Double-skin tubular columns (DSTCs) have become a competitive candidate for column members due to their important advantages compared with conventional reinforced concrete columns, including their better weight-to-strength ratio and ease of construction. Using Rubcrete in hybrid DSTCs is of great interest due to the potential of this system to overcome the Rubcrete material deficiencies and to add more ductility, toughness, seismic resistance, confinement effectiveness, and environmentally-friendly features to that structural system compared to conventional concrete. In this paper, hybrid DSTCs made out of Rubcrete, sandwiched between a fibre reinforced polymer (FRP) tube and a steel tube, were tested. The examined variables were concrete sand or stone replacement ratio (0% and 20%), FRP wall thickness (1- and 2-layers), steel wall thickness (3.2 mm and 4.5 mm), void ratio (50% and 76%), and void shape (circular or square). The axial and lateral stress–strain responses were monitored, measured, and compared. According to this investigation, using Rubcrete in hybrid DSTCs can enhance the axial and hoop strain capacities, especially with fine rubber particles. It was also observed that the adverse influence of using rubber on column ultimate capacity was much lower in DSTC specimens, compared with that of unconfined Rubcrete columns. Therefore, using Rubcrete with fine rubber particles is recommended in DSTC structural columns.
Highlights
The use of motor vehicles is universal around the world, which has resulted in immense numbers of used tyres being dumped into landfill
As a result of its better dilatancy performance, it has been reported in previous studies that confining of Rubcrete by fibre reinforced polymer (FRP) is more effective compared to traditional concrete [11,12,13,14]
Teng et al [25] applied the idea of hybrid Double-skin tubular columns (DSTCs) in beams by shifting the inner steel tube toward the tension side of the beam and showed a very ductile behaviour of the beams, where the FRP tube enhanced the beam structural behaviour by providing both confinement and additional shear resistance
Summary
The use of motor vehicles is universal around the world, which has resulted in immense numbers of used tyres being dumped into landfill. Teng et al [25] applied the idea of hybrid DSTC in beams by shifting the inner steel tube toward the tension side of the beam and showed a very ductile behaviour of the beams, where the FRP tube enhanced the beam structural behaviour by providing both confinement and additional shear resistance. Wang et al [26] found that the FRP jacket can significantly enhance the load carrying capacity of columns They reported that the diameter void ratio had negligible influence on the axial stress–strain behaviour of the FRP-confined columns. Sci. 2019, 3, x FOR PEER REVIEW tyre waste without compromising the structural behaviour of columns In this investigation, the effect of using Rubcrete rather than conventional concrete in DSTCs was investigated through a series of J. T2o.2f.oPrrmopotrhteionosuotfeCr oFnRcPre-tceoMnifixntuermesent tube, unidirectional sheets of carbon FRP 0.129 mm thickness and two-pAarctoenpvoexnytiroensailnc(oSnikcraedteurmei3x3tu0r)ewwehreicehmwpalsoycoends.idTehreedulatsimthaetecosntrteronlgothn,er, uwpatsudreessitgrnaeind,fmoroadulus of elatsatrigceittyc,oamnpdredsesnivseitsyt,refonrgtthhoefc5a5rbMoPna.FCRoPnssthaenettws awteerreto4c0e0m0eMntP(Wa,/1C.)7%rat,i2o3, s0uGpePrap,laasntidciz1e8r2(0SPk)g/m3, respedctoisvaegley, aanndd fcoemr eepntoxaymroeusnitn, wweerree u3s0eMd iPna,al0l.9m%ix,t4u.r5esGiPnat,haisndstu1d3y0.0Tkhge/mra3t,ioreosfpfeicnteivtoelyc.oaCrsirecular and sqagugarreegsateeflotrubthees wcointhtrodliffmeirxenwt awsa1l.l0thtoick1n.2esbsyeswaenigdhdt.iaTmhreeteerms/dixiems ewnesrioenusswede,reinuclsueddintog foonrem the innerctounbveenfotirotnhael choynbcrriedteDaSnTdCtws.oTRhuebncoremteinmailxyesie. lFdorsttrheenRgtuhb,curelteimmaitxees,treeitnhgetrhs,aannddoYroguranvge’lswmeoredulus of the steel tubes provided by the manufacturer were 350 MPa, 430 MPa, and 200 GPa, respectively
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