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Go to this website and they have a concrete calculator for just such a thing.http://www.sonotube.com/tools/concrete_calculator.html
1st u read the column that has the subject then the tally column last u determine/read the frequency column
Get the summation of the AREA of all columns and multiply with the effective height.
Step 1. Determine the total column height (in inches) as follows:Total column height (in inches) = column height (in feet) x 1213′ x 12″ = 156″Step 2. Enter the 24-inch cross-sectional dimension column in Table 1 at 13 feet. Step 3. · 3a. Determine the maximum (total) yoke spacing as follows:Maximum (total) yoke spacing = sum of all but the last yoke spacingfound in the columnYoke: 2d 3d 4th 5th 6th 7th 8th 9thYoke spacing:11″ + 12″ + 13″ + 14″ + 16″ + 22″ + 23″ + 23″ = 134″
10001/999900