Determine the maximum pitch, s, for the spirals in the following circular column.Column diameter, h = 28 in.Clear cover to spirals = 1.5 in.Number of longitudinal bars = 15Size of longitudinal bars = No. 9Size of spiral = No. 3Concrete strength = 6,500 psiYield strength of longitudinal bars = 60,000 psiYield strength of spiral = 60,000 psi

Use the interaction diagrams found in Appendix A of the textbook to determine whether the following circular spiral column can safely support a load of Pu = 308 kip and Mu = 18.0 kip-ft.h = 14 in.fc’ = 4 ksify = 60 ksiγ = 0.9ρg = 0.04

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 = 26 in.Column thickness, h = 22 in.Clear cover to ties = 1.5 in.Number of longitudinal bars = 6Size of longitudinal bars = No. 6Size of ties = No. 3Concrete strength = 4,000 psiYield strength of longitudinal bars = 60,000 psiYield strength of ties = 40,000 psi

A wall footing has the following conditions. Determine the depth, d, of the reinforcement. Assume the footing is 4 ft wide, the pressure that acts on the bottom of the footing is 6,600 psf, and the reinforcement is a #5 bar spaced every 12 inches.The bottom of the footing is at a depth of 4 ft below grade.The service dead load is 14 kips/ft, and the service live load is 6 kips/ft.The wall is 10 in. thick.The footing is 12 in. thick.The allowable soil pressure, qa, is 5,600 psf.The soil has a density of 110 lb/ft3.The concrete has a density of 150 lb/ft3.The concrete cover has a thickness of 3 in.f’c = 3,400 psi and fy = 60,000 psi.

Compute the axial compressive strength Pn and moment capacity Mn of the following tied column when the largest strain in the concrete is 0.003 and the strain in the tension reinforcement is 0.003. Note that you should not include φ in the answer and that you should not consider Pn,max.b = 14 in.h = 20 in.Clear cover to ties = 1.5 in.Number of longitudinal bars = 6Size of longitudinal bars = No. 6Size of ties = No. 3Concrete strength = 8,500 psiYield strength of longitudinal bars = 60,000 psiYield strength of ties = 40,000 psi

Determine the maximum axial strength φPn,max for the following circular tie column.Column diameter, h = 26 in.Number of longitudinal bars = 9Size of longitudinal bars = No. 9Size of ties = No. 4Concrete strength = 8,000 psiYield strength of longitudinal bars = 60,000 psiYield strength of ties = 60,000 psi

A wall footing has the following conditions. Determine the shear capacity, φVn, of the footing. Assume the footing is 4 ft wide, the pressure that acts on the bottom of the footing is 5,500 psf, and the reinforcement is a #5 bar spaced every 12 inches.The bottom of the footing is at a depth of 2 ft below grade.The service dead load is 9 kips/ft, and the service live load is 7 kips/ft.The wall is 16 in. thick.The footing is 12 in. thick.The allowable soil pressure, qa, is 5,200 psf.The soil has a density of 125 lb/ft3.The concrete has a density of 150 lb/ft3.The concrete cover has a thickness of 3 in.f’c = 3,600 psi and fy = 60,000 psi.

A wall footing has the following conditions. Determine the minimum cross-sectional area of the reinforcement. Assume the footing is 5 ft wide and the pressure that acts on the bottom of the footing is 5,360 psf.The bottom of the footing is at a depth of 4 ft below grade.The service dead load is 13 kips/ft, and the service live load is 7 kips/ft.The wall is 10 in. thick.The footing is 16 in. thick.The allowable soil pressure, qa, is 4,800 psf.The soil has a density of 120 lb/ft3.The concrete has a density of 150 lb/ft3.The concrete cover has a thickness of 3 in.f’c = 3,700 psi and fy = 60,000 psi.

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 = 20 in.Column thickness, h = 18 in.Clear cover to ties = 1.5 in.Number of longitudinal bars = 10Size of longitudinal bars = No. 10Size of ties = No. 4Concrete strength = 4,000 psiYield strength of longitudinal bars = 60,000 psiYield strength of ties = 40,000 psi

Determine the maximum pitch, s, for the spirals in the following circular column.Column diameter, h = 28 in.Clear cover to spirals = 1.5 in.Number of longitudinal bars = 10Size of longitudinal bars = No. 7Size of spiral = No. 3Concrete strength = 7,000 psiYield strength of longitudinal bars = 60,000 psiYield strength of spiral = 60,000 psi