Answered: Devise a spiral-shaped short column for…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Devise a spiral-shaped short column for a combined dead load of 450 kips (inclusive of self-weight) and a live load of 325 kips, passing through the column's centroid as depicted in Figure 2. The column's diameter is chosen for architectural considerations, and the design is limited to #8 bars.

Referencing the f value in ACI 318-14, establish the minimum number of #8 bars needed to withstand the factored loads. Additionally, compute the theoretical maximum spacing for the #3 spiral reinforcement and determine the ultimate axial load capacity of the column.

Explain why the strength reduction factor (f) specified in ACI 318-14 for spiral columns is greater than that for tied columns, providing at least one rationale.

Ps
Note:
4a.(D₂ - d.) _ volume of spiral reinforcement
SXD²
volume of core concrete
Clear Cover
1.5"
Gr. 60 steel
5000 psi concrete
20"
Figure 2
#8
-#3 spiral
PD=450 kip
PL = 325 kip

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