1.Determine the ultimate moment capacity of a rectangular, pre-stressed, concrete 14 in. wide _24.6 in. deep section. The steel tendon of 2.6 in.2 area is located 5 in. from the bottom. The tendon is pre-stressed to 300-kip force. The compression strength of concrete is 7 ksi, and the yield strength of pre-stressed steel is 230 ksi. 2. The beam in Problem 18.25 is subjected to a dead load of 1.5 k/ft (in addition to selfweight) and a live load of 5 k/ft over a span of 25 ft. Is the beam adequate? If not, design the beam using reinforcing steel of 50 ksi.
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