DefinePK

Abstract

Investigation on the effect of Concrete Filled Steel Tubular (CFST) column to Girder beam embedded connection under static and cyclic loading conditions. Analytical non-linear 3D element model for exterior and interior connection were modelled and investigated. Connections consisted of rectangular concrete filled tube, girder steel beam and high yield strength deformed bars. Beam is connected to the tube wall of CFST Column by means of weld along with four deformed bars connected to the flanges of girder section acting as a stiffener. Under loading conditions, the forces acting on the flange are effectively transferred to the CFST by means of deformed bars which is welded on both side of flanges of girder beam. Parameters that aids in effective force transfer mechanism are strength ratio of beam and column, CFSTs thickness, diameter and bar embedded length into the column. Rebar stiffener is found to be effective in transferring forces into the concrete core thereby exhibits inelastic characteristic strength properties. The plastic hinge formation is to be restricted to beam rather in connection or all the bars thereby avoiding distortion of tube wall. Three dimensional modelling and analysis is done using finite element software considering non linearity for material and geometry of elements used. Detailed results on hysteresis behaviour, load deformation, energy dissipating capacity, stiffness degradation and are discussed. It was found that embedded connections system were easy to fabricate and effective in terms of seismic performance of the structural system and better stiffness characteristics rather than any other simple connection.