V. AISC LRFD - Select Compression and Biaxial Bending
To select the lightest ASTM A992 W14 section capable of carrying an axial compression plus biaxial bending.
Reference
AISC Load Factor Resistance Design, 3rd Edition, Example 6.4, page 6-9.
Problem
Reverse curvature bending with equal end moments for both axis.
Comparison
Result Type | Theory | STAAD.Pro | Difference |
---|---|---|---|
Selection section | W14x99 | W14x99 | none |
STAAD Input
The file C:\Users\Public\Public Documents\STAAD.Pro 2024\Samples \Verification Models\09 Steel Design\US\AISC\AISC LRFD - Select Compression and Biaxial Bending.STD is typically installed with the program.
STAAD SPACE AXIAL COMPRESSION + BIAXIAL BENDING PER AISC LRFD 3RD ED
START JOB INFORMATION
ENGINEER DATE 23-Sep-18
END JOB INFORMATION
*
* EXAMPLE PROBLEM 6.4, PAGE 6-9, AISC LRFD 3RD ED.
* THE LIGHTEST SUITABLE SECTION SHOULD BE A W14X99
*
UNIT FEET KIP
JOINT COORDINATES
1 0 0 0; 2 14 0 0;
*
MEMBER INCIDENCES
1 1 2;
*
MEMBER PROPERTY AMERICAN
1 TABLE ST W14X90
*
DEFINE MATERIAL START
ISOTROPIC MATERIAL1
E 4.176e+06
POISSON 0.3
END DEFINE MATERIAL
CONSTANTS
MATERIAL MATERIAL1 ALL
*
SUPPORTS
1 FIXED
*
LOAD 1
JOINT LOAD
2 FX -400
2 MZ 250
2 MY 80
*
PERFORM ANALYSIS
*
PARAMETER 1
CODE LRFD
FYLD 7200 ALL
TRACK 2 ALL
SELECT ALL
*
FINISH
STAAD Output
AXIAL COMPRESSION + BIAXIAL BENDING PER AISC LRFD 3RD ED -- PAGE NO. 3
STAAD.PRO MEMBER SELECTION - (LRFD 3RD EDITION) v1.0
***********************************************
|--------------------------------------------------------------------------|
| Y PROPERTIES |
|************* | IN INCH UNIT |
| * |=============================| ===|=== ------------ |
|MEMBER 1 * | AISC SECTIONS | | AX=0.2910E+2 |
| * | ST W14X99 | | --Z AY=0.6887E+1 |
|DESIGN CODE * | | | AZ=0.1518E+2 |
| LRFD 2001 * =============================== ===|=== PY=0.8360E+2 |
| * PZ=0.1730E+3 |
| * |<---LENGTH (FT)= 14.00 --->| RY=0.3717E+1 |
|************* RZ=0.6176E+1 |
| |
| 250.0 (KIP-FEET) |
|PARAMETER | L1 L1 L1 CAPACITIES |
|IN KIP INCH | L1 L1 L1 IN KIP INCH |
|--------------- + L1 L1 L1 -------------|
| KL/R-Y= 45.20 | L1 L1 L1 PNC=0.1065E+4|
| KL/R-Z= 27.20 + L1 L1 L1 pnc=0.4000E+3|
| UNL = 168.00 |L1 L1 L1 L1 L1 L1 L1 L1 PNT=0.1310E+4|
| CB = 1.00 +L1 L1 L1 L1 L1 L1 L1 L1 pnt=0.0000E+0|
| PHIC = 0.85 |L1 L1 L1 L1 L1 L1 L1 L1 MNZ=0.7717E+4|
| PHIB = 0.90 +L1 L1 L1 L1 L1 L1 L1 L1 mnz=0.3000E+4|
| FYLD = 50.00 |L1 L1 L1 L1 L1 L1 L1 L1 MNY=0.3698E+4|
| NSF = 1.00 +---+---+---+---+---+---+---+---+---+---| mny=0.9600E+3|
| DFF = 0.00 250.0 VN =0.1859E+3|
| dff = 0.00 ABSOLUTE MZ ENVELOPE vn =0.0000E+0|
| (WITH LOAD NO.) |
| |
| MAX FORCE/ MOMENT SUMMARY (KIP-FEET) |
| ------------------------- |
| |
| AXIAL SHEAR-Y SHEAR-Z MOMENT-Y MOMENT-Z |
| |
| VALUE 400.0 0.0 0.0 80.0 250.0 |
| LOCATION 0.0 0.0 0.0 0.0 0.0 |
| LOADING 1 0 0 1 1 |
| |
|**************************************************************************|
|* *|
|* DESIGN SUMMARY (KIP-FEET) *|
|* -------------- *|
|* *|
|* RESULT/ CRITICAL COND/ RATIO/ LOADING/ *|
| FX MY MZ LOCATION |
| ====================================================== |
| PASS LRFD-H1-1A-C 0.951 1 |
| 400.00 C -80.00 -250.00 0.00 |
|* *|
|**************************************************************************|
| |
|--------------------------------------------------------------------------|