24"- 6" 27" 24" +8"+ 3'
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A reinforced concrete beam with a width of 8 in., a depth of 24 in. is poured monolithically with a 6-in.-thick slab as shown in the cross section provided below. The beam is reinforced with 3 # 8 steel reinforcing bars Grade 60 with a distance from the top of the slab to the centroid of the reinforcement of 27 in. (cover of 3.0 in.). If the concrete has a 28-day compressive strength of 4000 psi , calculate:
- The cracking moment (Mcr)
- The nominal moment capacity (Mn)
- The strain in the reinforcement at the time of concrete crushing (Ecu=0.003)
- The strength reduction factor (phi)
- The resistance moment capacity of the beam (Mr)
- Check the minimum area of reinforcement (As min)
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