Retroffiting Steel I-Beams using CFRP Strips

What is it about?

This study investigates the use of carbon fiber reinforced polymer (CFRP) strips as an alternative way of retrofitting steel I-beams. The flexural strength and maximum deflection of unstrengthened and CFRP-strengthened steel I-beams were compared. Three groups of samples were studied: the first group has CFRP strip installed on the tension flange of the steel I-beam; the second group has CFRP strips installed on the compression and tension flanges of the steel I-beam; and the third group comprises unstrengthened steel I-beams which serve as control specimens. All specimens were tested as simply supported beams under third-point loading. A reaction frame machine was used to apply the load while a dial indicator was used to measure deflections.

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Why is it important?

Traditional strengthening of steel structures is by welding and bolting. However, it has been reported that these methods have many undesirable effects in terms of corrosion performance, fatigue loading conditions, etc. This study will give designers valuable information on the strengthening effects of CFRP strips and actual deflection of CFRP strengthened steel I-beams.