Compute φVn for the cross section shown. Assume f’c = 5,000 psi, fyt = 60,000 psi, b1 = 31 in., b2 = 13 in., d1 = 8 in., d2 = 15 in., and that there are three No. 6 longitudinal tension bars and No. 5 stirrups at 9 in. o.c.

A beam is singly reinforced with the reinforcement in two rows. The bottom row contains 9 No. 7 bars at a depth of 24 in. The top row contains 5 No. 8 bars at a depth of 20 in. Determine the effective (centroidal) depth, d, of the steel.

A 118-mm-long beam supports a load of P = 28 N at midspan. The cross section is rectangular with width b = 29 mm and height h = 40 mm. Determine the magnitude of the horizontal shear stress at the centroid of the cross section.

Do stirrups prevent inclined cracks from forming?

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

For a beam with stirrup hooks, the free end of the bar must extend at least _____ from the hook. Assume b1 = 35 in., b2 = 11 in., d1 = 6 in., d2 = 25 in., and that there are three No. 7 longitudinal tension bars and No. 3 stirrups at 6 in. o.c. The stirrup hooks are 90°.

The height of available chairs may control a slab’s concrete compression strength.

A concrete floor system with a ratio of the longer to the shorter span length that is greater than or equal to 2 is usually considered a one-way system.

The use of compression reinforcement permits the use of more tension reinforcement to increase the strength of a given beam section while keeping the section tension-controlled.

Compute φVn for the cross section shown. Assume f’c = 3,000 psi, fyt = 60,000 psi, b1 = 23 in., b2 = 12 in., d = 24 in., h1 = 4 in., h2 = 17 in., h3 = 8 in., t = 7 in., and that there are six No. 6 longitudinal tension bars and No. 5 stirrups at 9 in. o.c.