Techno Press


Steel and Composite Structures   Volume 25, Number 1, September20 2017, pages 35-43
DOI: http://dx.doi.org/10.12989/scs.2017.25.1.035
 
Structural behaviors of notched steel beams strengthened using CFRP strips
Omid Yousefi, Kambiz Narmashiri and Mohammad Reza Ghaemdoust

 
Abstract     [Full Text]
    This paper presents the findings of experimental and numerical investigations on failure analysis and structural behavior of notched steel I-beams reinforced by bonded Carbon Fiber Reinforced Polymer (CFRP) plates under static load. To find solutions for preventing or delaying the failures, understanding the CFRP failure modes is beneficial. One non-strengthened control beam and four specimens with different deficiencies (one side and two sides) on flexural flanges in both experimental test and simulation were studied. Two additional notched beams were investigated just numerically. In the experimental test, four-point bending method with static gradual loading was employed. To simulate the specimens, ABAQUS software in full three dimensional (3D) case and non-linear analysis method was applied. The results show that the CFRP failure modes in strengthening of deficient steel I-beams include end-debonding, below point load debonding, splitting and delamination. Strengthening schedule is important to the occurrences and sequences of CFRP failure modes. Additionally, application of CFRP plates in the deficiency region prevents crack propagation and brittle failure.
 
Key Words
    Carbon Fiber Reinforced Polymer (CFRP); failure modes; deficiency; I-beam; steel; strengthening
 
Address
Department of Civil Engineering, Zahedan Branch, Islamic Azad University, Zahedan, Iran.
 

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