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Tributary area extends out from the member in question to the lines of zero shear on either side of the member.

Simply supported beams loaded with only gravity loads develop positive bending moments throughout the span.

Simply supported beams loaded with only gravity loads develop negative bending moments throughout the span.

A beam has dimensions of b = 18 in., h = 26 in., and d = 23.5 in. and is reinforced with 3 No. 8 bars. The concrete strength is 4,300 psi, and the yield strength of the reinforcement is 60,000 psi. Determine the strength Mn for this beam.

Simply supported beams loaded with only gravity loads develop tension cracks along the bottom of the beam.

The textbook author recommends using As’ ≤ 0.5As in doubly reinforced beam sections.

The thickness of concrete cover should be decreased for highly corrosive environments.

A beam has dimensions of b = 14 in., h = 28 in., and d = 25.5 in. and is reinforced with 2 No. 6 bars. The concrete strength is 3,700 psi, and the yield strength of the reinforcement is 60,000 psi. Assuming the reinforcement has yielded, determine the tensile force T in the reinforcement.

If a beam is supported by a girder of essentially the same depth, the compression fans that form in the supporting girder tend to tie the beam and girder together.

If a designer wants to reduce the size and weight of a beam, he/she could use additional tension reinforcement and add compression reinforcement to keep the section tension-controlled.