The simple span beam shown, is prestressed with a force of 150 kips and tendon eccentricities as shown. (Eccentricity is considered to be positive if measured downward from the concrete centroid.) (a) What are the concrete stresses at midspan and supports, at the top and bottom of the beam, resulting from prestress force if acting alone? Find these stresses based first on prestress force and eccentricity, and second using the equivalent load approach. (b) What stresses result from the superposition of prestress and self-weight of 208 plf? (c) What concrete stresses are obtained
The simple span beam shown, is prestressed with a force of 150 kips and tendon eccentricities as shown. (Eccentricity is considered to be positive if measured downward from the concrete centroid.) (a) What are the concrete stresses at midspan and supports, at the top and bottom of the beam, resulting from prestress force if acting alone? Find these stresses based first on prestress force and eccentricity, and second using the equivalent load approach. (b) What stresses result from the superposition of prestress and self-weight of 208 plf? (c) What concrete stresses are obtained when the live load Q = 15 kips is introduced? (d) Could a level (zero deflection everywhere) member be attained for some value of Q for the loading and tendon profile shown?
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