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http://dx.doi.org/10.12989/scs.2018.29.2.187

Experimental and FE investigation of repairing deficient square CFST beams using FRP  

Mustafa, Suzan A.A. (Department of Structural Engineering, Faculty of Engineering, Zagazig University)
Publication Information
Steel and Composite Structures / v.29, no.2, 2018 , pp. 187-200 More about this Journal
Abstract
This paper handles the repairing of deficient square Concrete-Filled Steel-Tube (CFST) beams subject to bending through an experimental and numerical program. Eight square-CFST beams were tested. A 5-mm artificial notch was induced at mid-span of seven beams, four of them were repaired by using CFRP sheets and two were repaired by using GFRP sheets. The beam deflection, strain and ultimate moments were recorded. It was found that providing different cut-off points for the different layers of FRP sheets prohibited failure at termination points due to stress concentrations. Using different lengths of FRP sheets around the notch retarded crack propagation and prevented FRP rupture at the crack position. Finite element analysis was then conducted and the proposed FE model was verified against the recorded experimental data. The influence of various parameters as FRP sheet length, tensile modulus and the number of layers were studied. The moment capacity of damaged square-CFST beams was improved up to 77.6% when repaired by using four layers of CFRP, however, this caused a dramatic decrease in beam deflection. U-wrapping of notched-CFST beam with 0.75 of its length provided a comparable behaviour as wrapping the full length of the beam.
Keywords
CFST; deficient; damaged; composite; FRP; beam; experimental; finite element;
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Times Cited By KSCI : 2  (Citation Analysis)
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