“STRENGTHENING OF BEAM-COLUMN JOINTS IN RC FRAMES USING STEEL SECTIONS”

Abstract

There are many details for reinforced concrete frame joints. Few of these details could satisfy the strength requirements, cracking and ductility. But the joint are still the weakest part in structural system. Observations made after earthquake, accidental loading shows that breakdown at the joint is the most frequent cause of failure of element connected. Distribution of stresses at an opening corner indicates that high tensile stresses exist at the inner corner normal to diagonal, coupled with tensile stresses along the diagonal. This paper explains the objectives to strengthen the joint to avoid the tensile stresses which causes the diagonal cracks at the joint. Five types test models are considered to analysis having different attachment to the corner for strengthening purpose. The models are subjected to heaviest load. Analyzed by using Stad-pro. The solid steel plates are found as an outstanding solution but attachment is very difficult. Chamfering is also helpful to this condition but cracks are developed in this case. The two angular plates are used to avoid diagonal cracks