Question

4.29. A precast T beam is to be used as a bridge over a small roadway. Concrete dimensions are b = 48 in., b, = 16 in., h = 5

in., and h =25 in. The effective depth d = 20 in. Concrete and steel strengths are 6000 psi and 60,000 psi, respectively. Using approximately one-half the maximum tensile reinforcement permitted by the ACI Code (select the actual size of bar and number to be used), determine the design moment capacity of the girder. If the beam is used on a 30 ft simple span, and if in addition to its own weight it.must support railings, curbs, and suspended loads totaling 0.475 kip/ft, what uniform service live load limit should be posted?

Fig: 1