Abstract
The RC column with wing-wall is vulnerable to large seismic excitation as the presence of wing-wall to original column section, the shear span to depth ratio becomes shorten and the seismic input force is considerably increased, and hence, the insufficient transverse reinforcement in that wing-wall column may lead to undesirable brittle shear failure. The strength and ductility of this shear critical wing-wall RC column can be extremely enhanced by transverse confinement which consequently imputes the benefit of shear strengthening. Considering this fact, a seismic retrofit concept of thick hybrid wall utilizing additional mortar sandwiched by steel plates and PC bar prestressing for RC column with wing-wall either one-sided or both-sided is proposed in this paper. The main goal of this research is to verify whether the proposed retrofit technique is effective or not in respect of enhancing the lateral capacity and ductility. The assessment of the proposed retrofit technique is experimentally investigated and also analytically evaluated. Moreover, to suggest the design guidelines of the proposed retrofit technique for wing-wall RC column, the simplified equations to calculate the flexural and shear strengths, and the selection techniques of steel plate thickness as well as diameter and minimum number of PC bars are also proposed in this paper.
