Axial capacity of post-heated square columns wrapped with FRP composites

This paper presents the experimental results of a study carried out to investigate the performance of post-heated reinforced concrete square columns repaired with unidirectional fibre reinforced polymers (FRP). The test specimens were divided into three groups: unheated columns, post-heated columns, and post-heated columns wrapped with a single layer of unidirectional glass or carbon fibre reinforced polymer jackets. All columns were tested under axial compression. The experimental results presented compare the effects of glass and carbon fibre reinforced polymer on the performance of post-heated square columns in terms of their stiffness, ductility, ultimate strain and the ultimate strength. The results indicated that a single layer of glass or carbon fibre reinforced polymer enhanced the ultimate strength, ductility and the ultimate strain significantly. However, the stiffness (secant stiffness) of post-heated columns was not improved when wrapped with a single layer of glass or carbon fibre reinforced polymer.