Experimental and FEA analysis of high-performance concrete column under biaxial loading

Abstract

In this work, the analysis of the long column loaded biaxially using high performance concrete is carried out. Total four numbers of high performance concrete columns are casted and then tested with biaxial load using loading frame. The compressive strength of the concrete used in columns is from 60 MPa and 80 MPa. After successfully casting of long columns using high performance concrete with 60 MPa and 80 MPa is cured for 28 days. For HPC, the average compressive strength achieved is 67 MPa and 86 MPa for 60 MPa and 80 MPa grades respectively. Biaxially loaded HPC columns at eccentricity of 10% and 20% for 60 Mpa and 80 Mpa grade is studied. The applied loads are in the range of 800 kN to 950 kN to assess the deflection of HPC long columns at different eccentricities. The experimental and FEA analysis was carried out to assess the performance of columns. From experimental and FEA analysis, it was seen that as eccentricity increases the deflection of HPC columns increases. The maximum deflection observed for 80 MPa grade HPC long column with 20% eccentricity. It was seen that, deflections observed for biaxial loading conditions for these fabricated columns are in allowable limits. It was also observed that, load carrying capacity developed in 60 MPa and 80 MPa grade HPC long column is greater than value given in codes.