Investigation on Corroded Hss Tubular Members under Compression Strengthened with CFRP Composites

Abstract

The main objective of this investigation is to assess the feasibility of strengthening of corroded (damaged) square hollow steel tubular sections subjected to compression and to develop or predict the suitable wrapping scheme of fi bre reinforced polymer (FRP) to enhance the structural behaviour of it. For this study, compact mild steel tubes were used with the main variable being FRP characteristics. Carbon fi bre reinforced polymer (CFRP) fabrics was used as horizontal strips (lateral ties) with other parameters such as the number of layers and spacing of strips. Among fourteen specimens, six were externally bonded by CFRP strips having a constant width of 50mm with a spacing of 20mm and the remaining six were externally bonded by CFRP strips having a constant width of 70mm with a spacing of 20mm, two columns were unbonded. Experiments were undertaken until the failure of columns to fully understand the infl uence of FRP characteristics on the compressive behaviour of the square sections including their failure modes, axial stress-strain behaviour, enhancement in the load carrying capapcity, and effect of distribution of CFRP layers. Finally, the behaviour of externally bonded hollow tubular sections was compared with one another and also with the control specimens. Evaluation of the results will lead to optimum CFRP jacketing/ wrapping arrangements for the steel tubes considered here.

Experimental studies on the effect of nano silica modified novel concrete CFST columns

“…Gopal (2016) indicated that using Fiber Reinforced Concrete (FRC) -filled with light gauge tubular columns improves the strength and ductility under eccentric loading. Sundarraja and Sriram (2014) found that the columns confined by three layers of carbon fibre-reinforced polymer (CFRP) with 50 mm spacing have more ability than the one and two layers of CFRP. Hadi (2006) provided the results by evaluating six conventional concrete columns bound with varying FRP layers and eccentrically loaded.…”