V. AISC LRFD - Angle Section Compression Capacity
To determine the design strength of an 8ft long single angle L4X3.5X5/16 in axial compression.
Reference
Hand calculation using the following reference:
AISC Load Factor Resistance Design, 3rd Edition, Example 4.3, page 4-12.
Problem
The column is pinned at its ends and no intermediate bracing.
Comparison
The reported STAAD.Pro value is based on the term PNC
in the STAAD.Pro output..
Result Type | Reference | STAAD.Pro | Difference | |
---|---|---|---|---|
Design strength (kips) | 28.7 | 28.66 | Negligible |
STAAD Input
The file C:\Users\Public\Public Documents\STAAD.Pro 2024\Samples \Verification Models\09 Steel Design\US\AISC\AISC LRFD - Angle Section Compression Capacity.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 4.3, PAGE 4-12, AISC LRFD 3RD ED.
* CAPACITY (PNC) SHOULD BE ABOUT 28.7 KIPS
*
UNIT FEET KIP
JOINT COORDINATES
1 0 0 0; 2 0 8 0;
MEMBER INCIDENCES
1 1 2;
MEMBER PROPERTY AMERICAN
1 TABLE ST L40355
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 -25
PERFORM ANALYSIS
UNIT INCHES KIP
PARAMETER 1
CODE LRFD
FYLD 36 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 L40355 (AISC SECTIONS)
PASS LRFD-H1-1A-C 0.872 1
25.00 C 0.00 0.00 0.00
+---------------------------------------------------------------------+
| DESIGN STRENGTHS FOR MEMBER 1 UNITS - KIP IN |
| PNC= 28.66 PNT= 72.90 MNZ= 60.87 MNY= 67.97 VN= 16.23 |
+---------------------------------------------------------------------+