Use of a five-span continuous beam to illustrate the critical load arrangement at ultimate limit state.

Assuming k = 3000 lb/in2, and considering only the bending stress:What rail type would you recommend if two identical forces of P = 30,000 lb, 70" apart, are applied to it?

30" Design the reinforcement for the T-beam in the middle which carries a live load of 200 lb/ft². The length of the beam is 25 ft. In your design assume concrete with a compressive strength of 3,000 psi density 150 lb/ft³ and Grade 60 Steel. 27" 12" 10'-0" 12" 10'-0" 12"