Study the Mechanical Properties of Steel tube Reinforced by Composite Materials

Abstract

ABSTRACT When exposed to compression and bending stresses, hollow structural members are extremely sensitive structural elements. To safely sustain both service static loads, steel hollow tube members must be strengthened. This study focused on the experimental verification of circular hollow sections of steel of different thicknesses and wrapped with glass fibers and carbon or glass and carbon at different angles 0° and 90° under bending and compression loading. Twelve samples were examined for buckling and 12 of them for bending with thicknesses of 2 mm and 3 mm. The results obtained indicated that the column with the largest thickness of 3 mm and wrapped with two layers of glass and carbon at an angle of carbon 90° bears a greater load than the rest of the samples because (FRP) it is responsible for increasing the axial capacitance of the hollow steel samples and where it can be Using this method to improve the performance of hollow steel sections. Critical buckling loads showed an increment of 35 % using two layers of Carbon and glass fibers in 2mm steel. The Same behavior was noticed using 3mm Composite tubes. Experimental results of 2mm tube compression test showed a 20% enhancement in Max stress with a 56% reduction in strain when a layer of glass and carbon were. Changing the tube thickness to 3mm showed an increase in applied loads of 70 % while a decrease of 64 % in strain where =0. Analyzing bending test showed a reduction of 77% in strain with an increase in applied load of 62%. To explore the failure of Composite tubes, failure mode was studied. 2mm steel tube showed an elephant foot buckling at the tube upper region. Considering 3mm tube elephant foot was noticed at the top with pulled and rupture of glass fiber in the upper region.