A simply supported beam with dimensions of b = 18 in., h = 28 in., d = 25.5 in., and L = 22 ft supports a uniform service (unfactored) dead load of 1.625 kips/ft including its own self weight plus a uniform service (unfactored) live load of 0.9 kips/ft. The beam is reinforced with two No. 6 Grade 60 bars. The concrete strength is 6,100 psi (normal weight). The beam has Grade 60 No. 3 stirrups. Determine the effective moment of inertia, Ie.The cracked moment Mcr = 114.8 kip-ft, and the maximum applied bending moment due to the combined service loads (dead plus live) Ma = 152.8 kip-ft. The neutral axis location of the cracked beam (measured from the top of the beam) is 3.7242 in.

With time, concrete frames expand due to creep, while brick exteriors shorten due to an increase in moisture content above their kiln-dried condition.

Rust occupies _______ times as much volume as the source metals.

The fatigue strength of concrete is not sensitive to stress concentrations.

A simply supported beam with dimensions of b = 16 in., h = 28 in., d = 25.5 in., and L = 19 ft supports a uniform service (unfactored) dead load of 1.666667 kips/ft including its own self weight plus a uniform service (unfactored) live load of 0.8 kips/ft. The beam is reinforced with three No. 5 Grade 60 bars. The concrete strength is 2,800 psi (normal weight). The beam has Grade 60 No. 3 stirrups. Determine the effective moment of inertia, Ie.The cracked moment Mcr = 69.14 kip-ft, and the maximum applied bending moment due to the combined service loads (dead plus live) Ma = 111.3 kip-ft. The neutral axis location of the cracked beam (measured from the top of the beam) is 4.809 in.

Compute the maximum bar spacing, s, to control for cracks in a one-way slab with 2 in. of clear cover and f​y​ = 52 ksi.

A rectangular beam has a cross section of b = 16 in., h = 26 in., and d = 23.5 in. It is reinforced with two No. 5 Grade 60 bars. The concrete strength is 3,400 psi (normal weight). The beam has Grade 60 No. 3 stirrups. Determine the transformed cross-sectional area of the bars, Ast.

An elastic calculation gives a good estimate of the concrete and steel stresses at working loads.

Compute the maximum bar spacing, s, to control for cracks in a one-way slab with 2.5 in. of clear cover and f​y​ = 54 ksi.

Creep decreases the stress in the tension steel.