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Elasticity is the name given to a sample’s ability to deform beyond its yield point without a significant loss of strength.

Flexural stiffness is inversely related to span length. Therefore, slab panels are much stiffer in their shorter span direction than in the longer span direction.

Determine As,min for the following beam given that f’c = 8,750 psi and fy = 60,000 psi.

Concrete forms should generally be chosen to allow for minimum reuse of the forms.

In an under-reinforced beam loaded in bending beyond its elastic range, the tension zone steel will yield before the concrete in the compression zone reaches its max useable strain.

A beam has dimensions of b = 18 in., h = 30 in., and d = 27.5 in. and is reinforced with 5 No. 7 bars. The concrete strength is 7,300 psi, and the yield strength of the reinforcement is 60,000 psi. If the depth to the neutral surface is c = 2.352706 in., determine the strain in the reinforcement.

When faced with severe architectural restrictions on the dimensions of a beam, a designer may be forced to use a doubly reinforced section.

A beam has dimensions of b = 14 in., h = 26 in., and d = 23.5 in. and is reinforced with 5 No. 7 bars. The concrete strength is 3,400 psi, and the yield strength of the reinforcement is 60,000 psi. If the depth to the neutral surface is c = 5.233927 in., determine the strain in the reinforcement.

A beam has dimensions of b = 14 in., h = 30 in., and d = 27.5 in. and is reinforced with 5 No. 5 bars. The concrete strength is 4,300 psi, and the yield strength of the reinforcement is 60,000 psi. Assuming the reinforcement has yielded, determine the depth to the neutral axis, c.

Flexural stiffness is inversely related to span length. Therefore, a higher percentage of the load applied to floor panels is carried in the short span direction as compared to the long span direction.