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 = 28 in.Column thickness, h = 12 in.Clear cover to ties = 1.5 in.Number of longitudinal bars = 14Size of longitudinal bars = No. 9Size of ties = No. 3Concrete strength = 5,500 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 spiral column.Column diameter, h = 18 in.Number of longitudinal bars = 10Size of longitudinal bars = No. 8Size of spirals = No. 3Concrete strength = 3,500 psiYield strength of longitudinal bars = 60,000 psiYield strength of spirals = 60,000 psi

Tied columns cannot be L-shaped.

Determine the maximum axial strength φPn,max for the following tied column.Column width, b = 26 in.Column thickness, h = 12 in.Number of longitudinal bars = 4Size of longitudinal bars = No. 10Size of ties = No. 4Concrete strength = 7,500 psiYield strength of longitudinal bars = 60,000 psiYield strength of ties = 40,000 psi

Ties serve as shear reinforcement for columns.

Because the designer has little control over the arrangement of the bars in a circular column, the interaction diagram should be computed for the least favorable bar orientation.

Determine the maximum pitch, s, for the spirals in the following circular column.Column diameter, h = 26 in.Clear cover to spirals = 1.5 in.Number of longitudinal bars = 6Size of longitudinal bars = No. 8Size of spiral = No. 3Concrete strength = 3,000 psiYield strength of longitudinal bars = 60,000 psiYield strength of spiral = 60,000 psi

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 = 6Size of longitudinal bars = No. 10Size of spiral = No. 4Concrete strength = 8,000 psiYield strength of longitudinal bars = 60,000 psiYield strength of spiral = 60,000 psi

Most compression members in concrete are only subjected to uniaxial loads.

The strain will be unequal in the steel and concrete that are bonded together in a symmetrical column subjected to a concentric axial load.