One of the three basic assumptions in the theory of flexure for reinforce concrete is that the strain in the reinforcement is less than the strain in the concrete at the same level.

A beam has dimensions of b = 18 in., h = 22 in., and d = 19.5 in. and is reinforced with 3 No. 8 bars. The concrete strength is 4,600 psi, and the yield strength of the reinforcement is 60,000 psi. If the depth of the compressive stress block is a = 2.02046 in. and the strain in the reinforcement is εs = 0.020742, determine the strength φMn for this beam. Assume the transverse reinforcement is not spirals.

A beam has dimensions of b = 14 in., h = 28 in., d’ = 2.5 in., and d = 25.5 in. It is reinforced with 2 No. 5 bars on the compression side and 5 No. 8 bars on the tension side. The concrete strength is 2,800 psi, and the yield strength of the reinforcement is 60,000 psi. If the depth of the neutral axis is c = 7.179 in., determine the force in the compression reinforcement, Cs.

In reviewing for the final exam, what have you discovered are the parts of the course about which you feel most confident? That is, what topics do you understand the best? Why?

17. What metabolic process is occurring in this PET scan?

One of the four primary reasons for using compression reinforcement in beams is increased lifespan of the structure.

One of the four primary reasons for using compression reinforcement in beams is increased lifespan of the structure.

One mole corresponds to 6.02 x 10-23 items

A beam has dimensions of b = 14 in., h = 30 in., d’ = 2.5 in., and d = 27.5 in. It is reinforced with 2 No. 5 bars on the compression side and 4 No. 8 bars on the tension side. The concrete strength is 3,700 psi, and the yield strength of the reinforcement is 60,000 psi. If the depth of the neutral axis is c = 4.481 in., determine the force in the compression reinforcement, Cs.

Determine β1 given that f’c = 7,000 psi.