V. ACI 318-99 Circular Column
Determine the reinforced steel quantity for a circular column per ACI 318-99.
Reference
Chu-Kia Wang and Charles G.Salmon, Reinforced Concrete Design, 5th Edition, Examples problem 13.15.1, p481 .
Problem
Spiral lateral reinforcement used.
Comparison
Result Type | Reference | STAAD.Pro | Difference |
---|---|---|---|
Required steel area (in2) | 10.45 | 10.505 | none |
Provided steel area (in2) | 10.82 (7- #11) | 10.82 (18- #7) | none |
Note: STAAD reports a more economical bar arrangement than the reference book.
STAAD Input
The file C:\Users\Public\Public Documents\STAAD.Pro 2024\Samples \Verification Models\10 Concrete Design\US\ACI 318-99 Circular Column.STD is typically installed with the program.
STAAD SPACE CIRCULAR CONCRETE COLUMN DESIGN PER ACI 318-99
START JOB INFORMATION
ENGINEER DATE 23-Sep-18
END JOB INFORMATION
*
* REFERENCE : REINFORCED CONCRETE DESIGN, 5TH EDITION BY CHU-KIA WANG
* AND CHARLES G.SALMON, EX.13.15.1 PAGE 481
*
* OBJECTIVE : TO DETERMINE THE REINFORCED STEEL QUANTITY FOR A
* CIRCULAR COLUMN PER THE ACI 318-99 CODE
*
UNIT FEET KIP
JOINT COORDINATES
1 0 0 0; 2 0 12 0;
MEMBER INCIDENCES
1 1 2;
UNIT INCHES KIP
MEMBER PROPERTY AMERICAN
1 PRIS YD 20
DEFINE MATERIAL START
ISOTROPIC MATERIAL1
E 3150
POISSON 0.17
END DEFINE MATERIAL
CONSTANTS
MATERIAL MATERIAL1 ALL
SUPPORTS
1 FIXED
LOAD 1
JOINT LOAD
2 FY -1060
PERFORM ANALYSIS
START CONCRETE DESIGN
CODE ACI 1999
REINF 1 ALL
DESIGN COLUMN ALL
END CONCRETE DESIGN
FINISH
STAAD Output
====================================================================
COLUMN NO. 1 DESIGN PER ACI 318-99 - AXIAL + BENDING
FY - 60000 FC - 4000 PSI, CIRC SIZE 20.00 INCHES DIAMETER SPIR
AREA OF STEEL REQUIRED = 10.505 SQ. IN.
BAR CONFIGURATION REINF PCT. LOAD LOCATION PHI
----------------------------------------------------------
18 - NUMBER 7 3.438 1 END 0.750
(EQUALLY SPACED)
TIE BAR NUMBER 4 SPACING 2.00 IN
********************END OF COLUMN DESIGN RESULTS********************