FINITE ELEMENT ANALYSIS OF REINFORCED CONCRETE COLUMN WITH CORE DRILLIN

Abstract

Reinforced concrete column is one of the compression structural member carry axial or slightly slanted compressive loads, with or without moment. In RC column opening provided for multiple purpose such as plumbing of pipes and electric wiring. The provision of such openings may result in the loss of strength, stiffness and ductility. Therefore, providing core hole needs some precaution in account of failures of the column. Most of researchers have studied effect of opening considering, hole position, hole diameter, hole shape and grade of concrete. However, there is lack of study on drilling concrete core with considering of steel grade, reinforcement area ratio, level of service load. Therefore, this study demonstrates finite element analysis of reinforced concrete column with drilled concrete core considering effect of opening in account of steel grade, reinforcement area ratio, level of service, cross section of column and drilling location. It shows deformation versus column capacity, concrete vertical strain, bar strain distribution around hole, capacity reduction relative to controlling specimen, core position effect and P-delta effect. Finite element analysis consist initial step associated with boundary condition and first step which nonlinear static stress analysis takes place. For checking accuracy of finite element analysis validation performed with available experimental literature. The results from finite element simulation of hole effect indicates; Increase grade of reinforcement; improve capacity of drilled column and axial deformation decreased by the range 6.18 % up to14.59 % relative to solid column. Reinforcement area ratio reduces axial deformation 31.2% between drilled specimens and cross-section of column increases; deformation decrease 18.18% axial deformation. In addition to this; hole position at end side has large reduction in axial capacity of column and resulted increase lateral deformation. Hole at end side has greater effect in lateral deformation relative to axial deformation