Design of column

May 5th, 2015
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According to ACI Code 2.2, a structural element with a ratio of height-to-least lateral dimension exceeding three used primarily to support compressive loads is defined as column. Columns support vertical loads from the floor and roof slabs and transfer these loads to the footings. Columns usually support compressive loads with or without bending.

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Rtgbw4Tg2Wtbv Rgtbwrtgb1Design of ColumnsIntroductionAccording to ACI Code 2.2, a structural element with a ratio of height-to-least lateral dimension exceeding three used primarily to support compressive loads is defined as column. Columns support vertical loads from the floor and roof slabs and transfer these loads to the footings. Columns usually support compressive loads with or without bending. Depending on the magnitude of the bending moment and the axial force, column behavior will vary from pure beam action to pure column action. Columns are classified as short or long depending on their slenderness ratios. Short columns usually fail when their materials are overstressed and long columns usually fail due to buckling which produces secondary moments resulting from the P effect. Columns are classified according to the way they are reinforced into tied and spirally reinforced columns. Columns are usually reinforced with longitudinal and transverse reinforcement. When this transverse reinforcement is in the form of ties, the column is called tied. If the transverse reinforcement is in the form of helical hoops, the column is called spirally reinforced. Since failure of columns often cause extensive damage, they are designed with a higher factor of safety than beams.Types of ColumnsColumns are divided into three types according to the way they are reinforced. Tied Columns A tied column, shown in Figure 1, is a column in which the longitu

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