Experimental & analytical behaviour and performance of structural joints retrofitted with woven wire mesh concreting under reversed cyclic loading

Abstract

Previous earthquakes have proven that failure of framed structure particularly at joints of beam and column caused disastrous collapse in structures that are built without seismic codal provisions. Most of the traditionally built Reinforced Cement Concrete (RCC) framed structures existing are lacking adequate reinforcement at structural joints and these joints are shear deficient. The main objective of the research studies was to enhance behaviour and performances of exterior structural joints by retrofitting and testing for displacement-controlled reversed cyclic loading. The joints retrofitted exhibits higher levels of ultimate displacements, higher levels of ultimate capacity previous to failure and the joints failed prior to failure of column. The variable novelty in research were size and shape of mesh, woven mesh, mesh orientation and wrapping in all direction around joints, cementitious matrix laminates with aggregate chips less than 5 mm, epoxy resin to increase bond between old and new concreting and chicken wire mesh near to cover and displacement controlled reversed cyclic loading was applied to column. The experimental research work indicated that, retrofitting with woven wire mesh strengthening technique will enhance the displacement ductility, stiffness, energy dissipation and strain. Thus the proposed retrofitted method anticipated in predicting the shear strength of joints.