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.

 Fy =36 ksi

 Length = 8 ft

Comparison

The reported STAAD.Pro value is based on the term PNC in the STAAD.Pro output..

Table 1. Comparison of results
Design strength (kips) 28.7 28.66 Negligible

The file C:\Users\Public\Public Documents\STAAD.Pro CONNECT Edition\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
2 FY -25
PERFORM ANALYSIS
UNIT INCHES KIP
PARAMETER 1
CODE LRFD
FYLD 36 ALL
TRACK 1 ALL
CHECK CODE ALL
FINISH
``````

```                         STAAD.Pro CODE CHECKING - (LRFD 3RD EDITION)   v1.0
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ALL UNITS ARE - KIP  INCH (UNLESS OTHERWISE Noted)