A beam has dimensions of b = 20 in., h = 10 in., and d = 7.5 in. and is reinforced with 4 No. 9 bars. The concrete strength is 4,700 psi, and the yield strength of the reinforcement is 60,000 psi. If the depth of the neutral axis is c = 3.686 in., does the reinforcement yield?

A 115-mm-long beam supports a load of P = 29 N at midspan. The cross section is rectangular with width b = 25 mm and height h = 60 mm. Determine the magnitude of the horizontal shear stress at the centroid of the cross section.

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 2,800 psi, and the yield strength of the reinforcement is 60,000 psi. If the depth of the neutral axis is c = 5.68 in., determine the strain in the compression reinforcement, ε’s.

Which of the following is not a purpose of concrete cover?

The shear failure of a slender beam without stirrups is _______.

Smaller diameter aggregate creates a rougher crack surface, allowing higher shear stresses to be transferred across cracks.

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.

_______ cracks near the ends of the beam are due to combined shear and flexure.

Flexural tension cracking will occur when the stress in the extreme tension fiber equals the modulus of rupture.

Shear stresses will exist in those parts of a beam where the moment is constant from section to section.