Structural performance of notch damaged steel beams repaired with composite materials

Abstract

An experimental program and an analytical model using ANSYS program were employed to estimate the structural performance of repaired damaged steel beams using fiber reinforced polymer (FRP) composite materials. The beams were artificially notched in the tension flanges at mid-spans and retrofitted by FRP flexible sheets on the tension flanges and the sheets were extended to cover parts of the beams webs with different heights. Eleven box steel beams, including one intact beam, one notch damaged beam and nine notches damaged beam and retrofitted with composite materials, were tested in twopoint loading up to failure. The parameters considered were the FRP type (GFRP and CFRP) and number of layers. The results indicated that bonding CFRP sheets to both of the tension steel flange and part of the webs, instead of the tension flange only, enhances the ultimate load of the retrofitted beams, avoids the occurrence of the debonding and increases the beam ductility. Also the numerical models give acceptable results in comparison with the experimental results.

Fatigue of notched steel hollow sections under sinusoidal cyclic loading

“…The numerical modelling is based on an experimental study by El-Taly [17]. Therefore, the design of steel hollow sections remains similar.…”

The parameters effect on the structural performance of damaged steel box beam using Taguchi method

“…Their results indicated that this damage causes decreasing the maximum load of the intact beam from 200 to 106 kN. Shaat (2007) and Eltaly (2016) completely cut the bottom flanges of wide beams and box beams, respectively, at midspan to simulate a severe section loss in the steel beams. Shaat (2007) concluded that the flexural strength and stiffness of the girders was reduced by 60 and 54%, respectively.…”

“…Shaat (2007) concluded that the flexural strength and stiffness of the girders was reduced by 60 and 54%, respectively. Eltaly (2016) indicated that the strength of notched beam was dropped by 34%. Tavakkolizadeh and Saadatmanesh (2001) estimated the effect of partial cutting of the tension flange using different depths of the cut (shallow and deep).…”