Structural Performance and Strengthening of RCC Interior Joint with Variable Beam Depth Using Sikawrap

Abstract

Sikawrap becomes preferable for strengthening and retrofitting of RC structural elements due to its high strength-to-weight and high stiffness to weight ratios. This study examines the structural performance and strengthening of RCC interior joint with variable beam depth using Sika wrap. In the first model, conventional connection is compared with beam, column and joint failure connection. In the second model, strengthening of beam connection is done by Lstrip method, embedment method and web-bounded method. In the third model, strengthening of column connection is done by L-shaped plate method and near surface mounted and wrap method. In the fourth model, strengthening of joint connection is done by X, U and T-shape method. In the fifth model, strengthening of beam column connection is done by L-shaped plate and wrap method and full wrap method. The structure will be analyzed using seismic analysis. This can be done by varying the depth of beam and finding which one possess more strength. Non-linear lateral loading test is carried out for beam-column connection with varying depth of beam on studying joint strength, target displacement and ductility for above all methods. This joint is the most critical portion of a building under earthquake due to diagonal crack failure, which leads to the collapse. Therefore, such joints need special attention to increase the capacity of existing damaged joints through retrofitting. In this paper the idea of using Sikawrap are studied. Sikawrap becomes preferable for strengthening and retrofitting of RC structural elements due to its high strength-to-weight and high-stiffness-to- weight ratios. Sika wrap comprises of unidirectional, carbon or glass fibre fabrics and structural epoxy resin based, impregnating resins. These unique combinations provide a wide range of strengthening and upgrading solutions to meet the many varied demands of different product and application. Strengthening methods are provided for defected beam, column and joints. The structure will be analysed using seismic analysis. It can be analysed by first finding the best model. This can be done by varying the depth of beam and finding which one possess more strength. Non-linear lateral loading testing is carried out for a beam-column connection with varying the depth of beam on studying the joint strength, target displacement and ductility for above all methods. The effective specimens are then studied under cyclic test.