cables having total area Ap = 0.575 in^2. Eccentricity of the steel varies parabolically from 0 at the supports to 7.58 in. at the center of the 30-ft span. The effective stress in the steel after losses is 132,000 psi. (a) What uniformly distributed superimposed load will
The concrete I-beam of attached figure "a" is prestressed with four stranded cables having total area Ap = 0.575 in^2. Eccentricity of the steel varies parabolically from 0 at the supports to 7.58 in. at the center of the 30-ft span. The effective stress in the steel after losses is 132,000 psi. (a) What uniformly distributed superimposed load will produce cracking of the beam, given that the modulus of rupture fr = 475 psi? (b) What superimposed load will produce a balanced condition of external and equivalent prestressed load, such that uniform axial compression will be obtained in the concrete? (c) For the balanced load just computed, would the midspan deflection be downward, upward, or zero? Explain.
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