Seismic strengthening of beam column joint bonded with cementitious laminates

Abstract

Evidences from previous earthquakes have shown that failure in beam column joints may cause disastrous collapse of structures especially for the buildings without seismic provisions To extend the life span of beam column joints strengthening is required and this can be effectively achieved on using Ferrocement laminates An investigation on the performance of reinforced concrete beam column joints under cyclic loading is reported In this study the beam column joint consisted of both column and beam of size 230 230 mm. Twelve specimens were cast out of which six are based on non ductile and remaining six are based on ductile detailing In each case one specimen were considered as control specimen All the non ductile specimens had identical dimensions and were reinforced so that they would represent non-ductile detailed exterior joint of RC frame as per IS 456-2000 code recommendations Reinforcement consists of four 12 mm diameter rebars in the column two 12 mm diameter rebars in each side of the beam 8 mm stirrups at a spacing of 150 mm in the column and beam uniformly All the ductile specimens had identical dimensions and were reinforced so that they would represent ductile detailed exterior joint of RC frame as per IS 13920 1993 code recommendations Reinforcement consists of four 12 mm diameter rebars in the column, two 12 mm diameter rebars in each side of the beam and 8 mm stirrups at a spacing of 100 mm in the column and beam at the non anchorage zone and 8 mm stirrups at a spacing of 75 mm at the anchorage zone newline