Question: Problem ( 8 - 3 8 ) . Since concrete can support little or no tension, this problem can be avoided by using wires or

Problem (8-38). Since concrete can support little or no tension, this problem can be avoided by using wires or rods to prestress the concrete once it is formed. Consider the simply supported beam shown, which has a rectangular cross section of 18in. by 12in. If concrete has a specific weight of 150lbft3, determine the required tension in rod AB, which runs through the beam so that no tensile stress is developed in the concrete at its center section a-a. Neglect the size of the rod and any deflection of the beam.
Problem ( 8 - 3 8 ) . Since concrete can support

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