![]() ![]() Classification of Column Based on Construction Materials Reinforced Concrete Column T-shaped columns may be used in bridge pillars depending on design requirements. V-shaped columns need more materials comparatively. In the trapezoidal structure, this type of column can be used. This design of the column can be a good replacement to resist both axial compression and biaxial bending of corners. The L-shaped column can be used as a corner column in a framed structure. On the other hand, rectangular columns are found in residential and official buildings. Circular columns provide a smooth and aesthetic finish. Circular columns are used when higher elevation is needed like in piles, bridges pillars. ![]() Generally tied columns may be square and rectangular while spiral columns are circular. Classification of Column Based On Shape Of Cross Section Geo-matric ShapedĬolumn sections can be rectangular, round, square, octagonal, hexagonal as per requirements. Long column fails due to buckling effect which reduces load-bearing capacity. As the slenderness increases, bending deformation increases. This type of column is also known as the slender column. The slenderness ratio exceeds 12 in long columns. The loads that a short column may support depend on the dimension of cross-section and the strength of materials. Short columns fail due to crushing or yielding of the steel bars. The slenderness ratio (ratio of effective length to the least lateral dimension) is less than 12 in the short reinforced column. Pedestals need not be reinforced and may be designed with plain concrete. Classification of Column Based On Slenderness Short Compression Block or PedestalsĪ pedestal is a compression member having a height less than three times its least lateral dimension. Spiral columns are used more extensively in seismic regions. The main bars are placed in a circle and ties are replaced by spirals. Because the spiral acts to resist the lateral expansion of the column bars under high axial loads. Spiral columns are used when high strength and/or high ductility are required. Spiral columns contain spirals to hold the main longitudinal reinforcement. ![]() Over 95 percent of all columns in buildings in non-seismic regions are tied columns. ![]() Steel ties in column confine the main longitudinal bars. These smaller bars are spaced at uniform intervals up the column. In the tied column, the longitudinal bars are tied together with smaller bars. Classification of Column Based On Column Ties Tied Column Loads cause moments about both the x- and y-axes simultaneously.Īxially loaded column, Uniaxial eccentric column, Biaxial eccentric column. In this type of column, loads are applied at any point of cross-section but not in axes. These eccentric loads cause moments along the x-axis or y-axis. In an uniaxial eccentrically loaded column this distance ‘e’ could be along x-axis or y-axis. When the loads are acting at a distance ‘ e’ from the centroid of the column cross-section, the column is termed as an eccentrically loaded column. This type of column without bending is not found practically so much. If the compressive vertical loads act along the centroidal axis of the column, it is termed as an axially loaded column. Classification of Column Based On Loading Axially Loaded Column
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