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A concrete wall form tie with an ultimate strength capacity of 2,400-lbs is designed for use in a concrete wall form with an 18-in center to center spacing. During formwork inspection it was discovered that the actual spacing is 24-in center to center. Using the actual spacing, the percent change in load on the wall form tie is most nearly:
Determine design tributary area: 1.5-ft x 1.5-ft = 2.25-ft2
Determine actual tributary area: 2-ft x 2-ft = 4-ft2
Determine design ft2 load: 2400-lbs / 2.25-ft2 = 1066.67-lbs/ft2
Determine actual load on 4-ft2: 1066.67- lbs/ft2 x 4-ft2 = 4266.68-lbs
Increase in load is: 4266.68-lbs - 2400-lbs = 1866.68-lbs
Calculate % change = 1 - (4266.68-lbs / 2400-lbs) = 78%
The load increase is 78% on the wall form tie.
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