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

At a point subjected to plane stress, the stresses are σx = 10 MPa, σy = –50 MPa, and τxy = –90 MPa. Determine the angle θp corresponding to the orientation of the principal planes at the point.

A classmate has suggested a beam design that has dimensions of b = 14 in., h = 28 in., and d = 25.5 in. and is reinforced with 4 No. 11 bars. Assuming a cover of 1.5 in. and a stirrup diameter of 0.5 in., does the reinforcement fit within a single row as suggested?

A beam has dimensions of b = 16 in., h = 22 in., and d = 19.5 in. and is reinforced with 2 No. 5 bars. The concrete strength is 10,000 psi, and the yield strength of the reinforcement is 60,000 psi. Determine the strength Mn for this beam.

What is the primary reason to add web reinforcement?

A classmate has suggested a beam design that has dimensions of b = 12 in., h = 22 in., and d = 19.5 in. and is reinforced with 4 No. 14 bars. Assuming a cover of 1.5 in. and a stirrup diameter of 0.5 in., does the reinforcement fit within a single row as suggested?

Two-way slabs typically have flexural reinforcement in the short direction to resist the entire load applied to the floor and only minimum steel for temperature and shrinkage effects in the long direction.

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.

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 4 No. 8 bars on the tension side. The concrete strength is 3,400 psi, and the yield strength of the reinforcement is 60,000 psi. If the depth of the neutral axis is c = 4.812 in., determine the strain in the compression reinforcement, ε’s.

Slab thickness cannot be determined from fire rating.