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 = 704 kip and Mu = 241.3 kip-ft.h = 16 in.fc’ = 4 ksify = 60 ksiγ = 0.9ρg = 0.02

In small buildings, the most frequently used concrete strength is _______ to _______ psi.

In seismic regions, column ties are heavier and spaced further apart than ties in nonseismic regions.

Ties restrain the longitudinal bars from buckling out through the surface of the column.

Determine the location of the neutral axis, c, for the following tied column when the largest strain in the concrete is 0.003 and the strain in the tension reinforcement is 0.003.b = 14 in.h = 24 in.Clear cover to ties = 1.5 in.Number of longitudinal bars = 6Size of longitudinal bars = No. 9Size of ties = No. 3Concrete strength = 3,500 psiYield strength of longitudinal bars = 60,000 psiYield strength of ties = 60,000 psi

In seismic regions, ties are normally spaced further apart.

Determine the maximum axial strength φPn,max for the following circular tie column.Column diameter, h = 24 in.Number of longitudinal bars = 10Size of longitudinal bars = No. 8Size of ties = No. 3Concrete strength = 4,000 psiYield strength of longitudinal bars = 60,000 psiYield strength of ties = 60,000 psi

Determine the maximum axial strength φPn,max for the following tied column.Column width, b = 22 in.Column thickness, h = 20 in.Number of longitudinal bars = 4Size of longitudinal bars = No. 7Size of ties = No. 4Concrete strength = 5,500 psiYield strength of longitudinal bars = 60,000 psiYield strength of ties = 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 = 704 kip and Mu = 160.8 kip-ft.h = 16 in.fc’ = 4 ksify = 60 ksiγ = 0.9ρg = 0.04

To account for the effect of accidental moments, the maximum load on a tied column must not exceed 80% of the load capacity.