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Extracted text: 12:31 Top tie 4. Assume that the wet concrete (s.w. = 150 Ibf/ft³) behaves as a liquid. Determine the force per unit foot of length exerted on the forms. If the forms are held in place as shown, with the ties between vertical braces spaced every 2 ft, what force is exerted on the bottom tie? Brace Form 9 ft - Concrete Bottom tie