Comparative Study of RC Column with RC Jacketing and FRP Jacketing

Abstract

This study evaluates two prevalent methods for retrofitting RC columns RC Jacketing and FRP Wrapping focusing on their application to columns, excluding shear walls, beams, and slabs. The evaluation considers factors such as cost, site feasibility, labour requirements, strength enhancement, aesthetic impact, durability and compliance with seismic design codes IS 1893:2016 part-I and FRP code ACI 440.2R-17 Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures.

Cost Analysis: RC Jacketing typically incurs lower costs due to material expenses and labour- intensive processes. In contrast, FRP Wrapping offers a high cost especially for retrofitting

existing structures. Site Feasibility: FRP Wrapping is advantageous in scenarios with limited access or where minimal disruption is desired, as it requires less space and can be applied without extensive structural modifications. Labour Requirements: RC Jacketing demands skilled labour for formwork, concrete pouring, and curing processes. FRP Wrapping, while requiring specialized knowledge for material handling and application, can be less labour intensive and quicker to implement, reducing downtime and associated costs. Strength Enhancement: Both methods effectively enhance the axial load capacity and ductility of RC columns. However, the extent of strength improvement may vary based on the quality of execution and material properties. Spatial Constraints: FRP wrapping is preferable in confined spaces due to its minimal increase in column dimensions, whereas RC Jacketing may not be feasible if the additional thickness exceeds 250 mm and FRP should not exceeds 8 raps Durability: FRP materials offer superior resistance to corrosion and environmental degradation, enhancing the longevity of retrofitted columns. The selection between RC Jacketing and FRP Wrapping for column retrofitting depends on various factors, including cost, site conditions, labour availability, and seismic considerations. While both methods offer significant improvements in structural performance, FRP Wrapping presents advantages in terms of cost-effectiveness, ease of application, and minimal disruption, particularly in regions with high seismic activity as per IS 1893:1984 and IS 1893:2016.

Keywords: RC Jacketing, FRP Wrapping, Column Retrofitting, IS 1893:2016 part-I, 440.2R- 17, Seismic Design and Structural Rehabilitation.