Use the interaction diagrams found in Appendix A of the textbook to determine whether the following rectangular tied column with bars in 2 faces can safely support a load of Pu = 1,320 kip and Mu = 645.3 kip-ft.b = 20 in.h = 22 in.fc’ = 4 ksify = 60 ksiγ = 0.6ρg = 0.03

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

Determine the maximum pitch, s, for the spirals in the following circular column.Column diameter, h = 18 in.Clear cover to spirals = 1.5 in.Number of longitudinal bars = 12Size of longitudinal bars = No. 6Size of spiral = No. 4Concrete strength = 3,000 psiYield strength of longitudinal bars = 60,000 psiYield strength of spiral = 60,000 psi

To account for the effect of accidental moments, the maximum load on a tied column must not exceed 85% of the load capacity.

Determine the maximum axial strength φPn,max for the following circular spiral column.Column diameter, h = 24 in.Number of longitudinal bars = 12Size of longitudinal bars = No. 10Size of spirals = No. 3Concrete strength = 5,000 psiYield strength of longitudinal bars = 60,000 psiYield strength of spirals = 60,000 psi

By definition, a column is a special case of a compression member that is horizontal.

The strength reduction factor of compression-controlled tied columns is _____.

Designers should compute the interaction diagram for the most favorable bar orientation in a circular column because they have little to no control over how the bars are actually installed.

Compression members in concrete structures are subjected to only axial loads.

Determine the maximum axial strength φPn,max for the following circular spiral column.Column diameter, h = 26 in.Number of longitudinal bars = 10Size of longitudinal bars = No. 10Size of spirals = No. 3Concrete strength = 7,000 psiYield strength of longitudinal bars = 60,000 psiYield strength of spirals = 60,000 psi