Title of article :
Effect of FRP strengthening on the SHS brace collapse mechanism
Author/Authors :
Shadan, P Department of Civil Engineering - Amirkabir University of Technology, Tehran , Kabir, M.Z Department of Civil Engineering - Amirkabir University of Technology, Tehran
Abstract :
During an earthquake, diagonal braces are designed to dissipate energy by
yielding in tension and buckling in compression. However, local buckling occurring in the
middle of the brace leads to immediate fracture. Aiming to strengthen braces against
local buckling, this study proposes wrapping FRP sheets in the transverse direction. The
effect of FRP strengthening on the post-buckling behavior of Square Hollow Section (SHS)
tubes has not been investigated. A numerical model was generated and verified by other
previous researches. Then, a comprehensive parametric study was conducted, and the
effects of slenderness ratio, the number of FRP layers, and FRP coverage percentage on
post-buckling response of the strengthened brace were explored within this study. Results
indicated that utilizing FRP was certainly successful in mitigating local buckling mode of
long SHS braces. Moreover, for short braces, applying enough FRP layers can change the
mode of buckling from local to overall. Finally, an optimized length of FRP was proposed
for brace strengthening in accordance with their slenderness ratio.
Keywords :
Stability , Strengthening , CFRP , Square hollow section brace , Numerical study
Journal title :
Scientia Iranica(Transactions A: Civil Engineering)
