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Less then _____ percent of all columns in buildings in nonseismic regions are spiral columns.

A simply supported beam with dimensions of b = 16 in., h = 22 in., d = 19.5 in., and L = 25 ft supports a uniform service (unfactored) dead load of 1.766667 kips/ft including its own self weight plus a uniform service (unfactored) live load of 1.0 kips/ft. The beam is reinforced with four No. 5 Grade 60 bars. The concrete strength is 7,000 psi (normal weight). The beam has Grade 60 No. 3 stirrups. Determine the effective moment of inertia, Ie.The cracked moment Mcr = 67.49 kip-ft, and the maximum applied bending moment due to the combined service loads (dead plus live) Ma = 216.1 kip-ft. The neutral axis location of the cracked beam (measured from the top of the beam) is 3.8417 in.

Vertical stirrups are preferable over inclined stirrups when _______.

Determine the required splice length for the longitudinal bars in the following tied column. Assume that all of the longitudinal bars are in compression and that you will use a contact lap splice. Do not incorporate a reduction in length due to ACI 318-14 Section 10.7.5.2.1.Column width, b = 24 in.Column thickness, h = 22 in.Clear cover to ties = 1.5 in.Number of longitudinal bars = 10Size of longitudinal bars = No. 9Size of ties = No. 4Concrete strength = 3,000 psiYield strength of longitudinal bars = 60,000 psiYield strength of ties = 40,000 psi

A rectangular beam has a cross section of b = 14 in., h = 24 in., and d = 21.5 in. It is reinforced with five No. 8 Grade 60 bars. The concrete strength is 7,600 psi (normal weight). The beam has Grade 60 No. 3 stirrups. Determine the assumed modulus of elasticity of the concrete, Ec.

A simply supported beam with dimensions of b = 14 in., h = 28 in., d = 25.5 in., and L = 24 ft supports a uniform service (unfactored) dead load of 1.808333 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. 7 Grade 60 bars. The concrete strength is 9,700 psi (normal weight). The beam has Grade 60 No. 3 stirrups. Using the effective moment of inertia, determine the immediate mid-span deflection of the beam due to the combined service loads (dead plus live).The effective moment of inertia Ie = 7,480.8 in.4.

People dancing can cause vibration problems in buildings.

Spirals are normally made from Grade-40 steel.

A simply supported beam with dimensions of b = 14 in., h = 26 in., d = 23.5 in., and L = 23 ft supports a uniform service (unfactored) dead load of 1.479167 kips/ft including its own self weight plus a uniform service (unfactored) live load of 1.3 kips/ft. The beam is reinforced with five No. 7 Grade 60 bars. The concrete strength is 5,800 psi (normal weight). The beam has Grade 60 No. 3 stirrups. Using the effective moment of inertia, determine the immediate mid-span deflection of the beam due to the combined service loads (dead plus live).The effective moment of inertia Ie = 7,972.8 in.4.

Rust can cause a bursting force in the concrete where the bar is located and cause an eventual loss of cover.