Chapter 8

Question 1

What are the 4 reasons for providing Ties?

Answer 1

1) Increases the ductility of the column by confining the concrete
2) provides lateral support for the longitudinal bars and prevents them from buckling
3) holds the longitudinal bars/reinforcement cage in place during construction
4) Acts as shear reinforcement

Question 2

Benefits of spiral columns

Answer 2

• high strength and ductility
• better in seismic areas
• better restrains lateral expansion
• have a ductile failure
• fail when spiral reinforcement yields

Question 3

For short columns, the max load at a given eccentricity is governed by

Answer 3

1) Material Strength

2) cross-sectional dimensions

Question 4

For long columns, the max load at a given eccentricity is governed by

Answer 4

1) slenderness ratio

2) Lateral displacement at mid-height