Title:
Behavior of High Strength Concrete Columns Subjected To Small Biaxial Eccentricity and Strengthened By FRP Laminates
Author(s):
Wael M. Hassan, Osama, A. Hodhod, Mohamed Sameh M. Hilal, and Heba H. Bahnsawy
Publication:
Symposium Paper
Volume:
293
Issue:
Appears on pages(s):
1-22
Keywords:
Biaxial eccentricity, columns, confinement, FRP, high strength concrete, reinforced concrete, strengthening.
DOI:
10.14359/51686240
Date:
10/4/2013
Abstract:
The present study is an experimental investigation into the performance of high-strength concrete (HSC) square short columns subjected to biaxial bending moments and strengthened by FRP laminates. The main objectives of the study are: to evaluate the strength and deformational enhancement in the structural performance of HSC columns subjected to small biaxial eccentricity when strengthened by externally applied FRP laminates, and to investigate the optimum arrangement and amount of FRP laminates to achieve potential enhancement in structural performance.
The study parameters are the number, type and arrangement of FRP layers and the concrete compressive strength. The static axial load small eccentricity (compression-controlled failure) is kept constant corresponding to e/t = 0.125 in two perpendicular directions to the columns principal axes, and the FRP wraps are applied in single or double layers (partial or full column height wrapping). In the present work, test results of eight large-scale concrete columns are presented and discussed. The study has experimentally proven the efficiency of FRP laminates, as a strengthening alternative, in enhancing the strength of biaxially loaded square HSC columns through increasing their axial load carrying capacity (by up to 28%) and flexural capacity (by up to 41%). FRP wraps are also successful in increasing ductility of the strengthened columns. FRP wraps significantly reduced stiffness and strength degradation of HSC columns. Stiffness of strengthened columns is not increased which may be considered an advantage in seismic applications.