Experimental and Numerical Analysis of a CFRP Strengthened Steel-Concrete Composite Beam

Year 2018, Volume: 21 Issue: 1, 113 - 121, 31.03.2018

Emre Ercan , Bengi Arısoy Emin Hökelekli

https://doi.org/10.2339/politeknik.385920

Abstract

In this study, experimental and nonlinear finite
element analysis of strengthened steel-concrete composite beams is presented. A
steel-concrete composite beam is produced by using a steel beam and concrete
slab bonded each other with shear connectors. Strengthening is applied by
Carbon Fiber Reinforced Polymers (CFRP) sheets to the lower flange of the steel
beam.  Three samples are prepared, one of
them is considered as a reference sample, the other two are strengthened by
CFRP sheets with different number of layers. 
In experimental study, steel-concrete composite beams were tested by
4-point bending test with cyclic loading. During the test, load, deflection,
and strain values are measured. Then 3D finite element models of the
steel-concrete composite beams are prepared using tetrahedral elements. Finite
element analysis is performed by using ATENA nonlinear analysis program. The
results of experiments and finite element analysis are compared. Results
indicated that the strengthened steel-concrete composite beams have larger
moment capacity, lower deflection that the steel-concrete composite beam
sample. Some evaluations are made on especially in terms of strength,
applicability, stiffness and energy consumption about the steel-concrete
composite beams with CFRP. Experimental results are found similar to the
results obtained by nonlinear finite element method.

Keywords

CFRP, strengthened steel-composite beam, 4-point loading test, FEM

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