One of the primary reasons for using compression reinforcement is to increase the ductility of a given beam section.

A beam is singly reinforced with the reinforcement in two rows. The bottom row contains 8 No. 7 bars at a depth of 18 in. The top row contains 5 No. 7 bars at a depth of 13 in. Determine the effective (centroidal) depth, d, of the steel.

A beam is singly reinforced with the reinforcement in two rows. The bottom row contains 8 No. 7 bars at a depth of 18 in. The top row contains 5 No. 7 bars at a depth of 13 in. Determine the effective (centroidal) depth, d, of the steel.

A simply supported beam with dimensions of b = 10 in., h = 28 in., d = 25.5 in., and L = 23 ft supports a uniform service (unfactored) dead load consisting of its own weight plus 1.1 kips/ft and a uniform service (unfactored) live load of 1.1 kips/ft. The concrete is normal-weight concrete. Determine the moment due to the factored loads, Mu.      

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 2,500 psi, and the yield strength of the reinforcement is 60,000 psi. If the depth of the neutral axis is c = 6.268 in., determine the strain in the compression reinforcement, ε’s.

Alternate span loading is the common loading pattern for determining maximum midspan positive moments due to live load.

A beam has dimensions of b = 18 in., h = 24 in., and d = 21.5 in. and is reinforced with 4 No. 8 bars. The concrete strength is 5,800 psi, and the yield strength of the reinforcement is 60,000 psi. If the depth of the compressive stress block is a = 2.136579 in. and the strain in the reinforcement is εs = 0.019943, determine the strength φMn for this beam. Assume the transverse reinforcement is not spirals.

A beam has dimensions of b = 16 in., h = 28 in., and d = 25.5 in. and is reinforced with 3 No. 8 bars. The concrete strength is 6,400 psi, and the yield strength of the reinforcement is 60,000 psi. Determine the strength Mn for this beam.

A beam is singly reinforced with the reinforcement in two rows. The bottom row contains 10 No. 6 bars at a depth of 22 in. The top row contains 7 No. 6 bars at a depth of 19 in. Determine the effective (centroidal) depth, d, of the steel.

A beam is singly reinforced with the reinforcement in two rows. The bottom row contains 10 No. 6 bars at a depth of 22 in. The top row contains 7 No. 6 bars at a depth of 19 in. Determine the effective (centroidal) depth, d, of the steel.