V. AISC LRFD - Wide Flange Compression Capacity 1
To determine the capacity of W14X132 column in axial compression.
Reference
Hand calculation using the following reference:
AISC Load Factor Resistance Design, 3rd Edition, Example 4.1, case (a), page 4-7.
Problem
The column is braced at its ends for both axes.
Hand Calculation
Net section = 0.795(3.75 in.2) = 2.98 in.2
Comparison
The reported STAAD.Pro value is based on the term PNT
in the STAAD.Pro output..
Result Type | Theory | STAAD.Pro | Difference | |
---|---|---|---|---|
Design strength (kips) | 844 | 843.02 | none |
STAAD Input
The file C:\Users\Public\Public Documents\STAAD.Pro 2024\Samples \Verification Models\09 Steel Design\US\AISC\AISC LRFD - Wide Flange Compression Capacity 1.STD is typically installed with the program.
STAAD SPACE AXIAL COMPRESSION CAPACITY PER AISC LRFD 3RD ED
START JOB INFORMATION
ENGINEER DATE 23-Sep-18
END JOB INFORMATION
*
* EXAMPLE PROBLEM 4.1, CASE (A), PAGE 4-7, AISC LRFD 3RD ED.
* CAPACITY (PNC) SHOULD BE ABOUT 844 KIPS
*
UNIT FEET KIP
JOINT COORDINATES
1 0 0 0; 2 0 30 0;
MEMBER INCIDENCES
1 1 2;
MEMBER PROPERTY AMERICAN
1 TABLE ST W14X132
UNIT INCHES KIP
DEFINE MATERIAL START
ISOTROPIC MATERIAL1
E 29000
POISSON 0.3
END DEFINE MATERIAL
UNIT FEET KIP
CONSTANTS
MATERIAL MATERIAL1 ALL
SUPPORTS
1 PINNED
2 FIXED BUT FY MX MZ
LOAD 1
JOINT LOAD
2 FY -840
PERFORM ANALYSIS
UNIT INCHES KIP
PARAMETER 1
CODE LRFD
FYLD 50 ALL
TRACK 1 ALL
CHECK CODE ALL
FINISH
STAAD Output
STAAD.Pro CODE CHECKING - (LRFD 3RD EDITION) v1.0
***********************
ALL UNITS ARE - KIP INCH (UNLESS OTHERWISE Noted)
MEMBER TABLE RESULT/ CRITICAL COND/ RATIO/ LOADING/
FX MY MZ LOCATION
=======================================================================
1 ST W14X132 (AISC SECTIONS)
PASS LRFD-H1-1A-C 0.996 1
840.00 C 0.00 0.00 0.00
+---------------------------------------------------------------------+
| DESIGN STRENGTHS FOR MEMBER 1 UNITS - KIP IN |
| PNC= 843.02 PNT= 1746.00 MNZ= 9138.93 MNY= 5032.65 VN= 256.00 |
+---------------------------------------------------------------------+