Minimum Area Of Steel In Column

Suppose we have a column footing having a length 2 m width 2 m and having a thickness 0 250 m.

Minimum area of steel in column. D is the over all depth not effective depth. σ s is the absolute value of the maximum stress permitted in the reinforcement immediately after formation of the crack. Convert that length into kilograms or tons. F min 0 0025.

It says that you can base the minimum reinforcement i e. The main bars is 12 mm 150 c c and distribution bar is also 12 mm 150 c c. 1 of 0 5ag is 0 5 of ag. A s min is the minimum area of reinforcing steel within the tensile zone.

Aci 318 05 section 10 8 4 talks about it. It doesn t specifically 0 5 reinforcement but does word the section such that it is pretty clear that is the intent. The minimum ratio of required reinforcement is. Calculate the number of steel is going to use in this column footing.

F min 0 0015. The footing clear cover is 50 mm from the top and 75 mm from the bottom. The tensile zone is that part of the section which is calculated to be in tension just before formation of the first crack. This can be done by multiplying cross section area of steel by its total length by density of steel which 7850 kg m 3.

1 on a reduced effective area ag not less than 1 2 the total area. A ct is the area of concrete within tensile zone. F min 0 002 for f y 40 000 psi. The minimum of steel in column is 0 85 of bd and the maximum is 4 of bd.