Comparison of Retrofitting of Columns with FRPs, Steel Jackets, Concrete Jackets and Ferro cement

Abstract

Inadequate design and construction, reinforcing steel corrosion, and deterioration due to variety of aggressive environmental effects all create a need for structural strengthening of concrete. Furthermore, recent earthquakes in Pakistan have promoted an urgency to upgrade seismic deficient structures to reduce casualties and damages. Some recently developed techniques can play vital role in structural repairs, seismic strengthening and retrofitting of existing structures whether damaged or undamaged. Selection of right materials, techniques and procedures to be employed for a given structure has been major challenge. The selection of techniques to be used depends on many aspects that may be viewed from different perspective i.e. requirement and availability of financial resources, applicability and suitability of material for the repair of damaged structures. Significant amount of research work has been carried out in recent years to develop various strengthening and rehabilitation techniques to improve the seismic performance of the structures. Seismic retrofit with FRP (Fiber Reinforced Polymers) materials has gain notable acceptance from civil engineering community in recent years as the FRP can help to cure many ills that beset concrete. A thorough literature review will be carried out to determine strength and ductility of column using different retrofitting techniques namely FRP, steel jackets, concrete jackets and Ferrocement. The effective techniques will be highlighted for retrofitting of structures in seismic and non-seismic areas