V. AISC ASD - Select Wide Flange Beam 1
Determine the optimum W shape that spans 30 ft, and is braced at 7.5 ft intervals.
Reference
AISC Allowable Stress Design, 9th Edition,Example 6, page 2-35.
Problem
Three concentrated loads of 20 kips each at quarter span points. Desired beam depth of 18 in.
Comparison
Result Type | Theory | STAAD.Pro | Difference | |
---|---|---|---|---|
Selected section | W18x86 | W18x86 | none |
STAAD Input
The file C:\Users\Public\Public Documents\STAAD.Pro 2024\Samples \Verification Models\09 Steel Design\US\AISC\AISC ASD - Select Wide Flange Beam 1.STD is typically installed with the program.
STAAD SPACE AISC VERIFICATION PROBLEM FOR BENDING CAPACITY. PAGE 2-35 OF
START JOB INFORMATION
ENGINEER DATE 22-Sep-18
END JOB INFORMATION
* 9TH ED. AISC-ASD EXAMPLE 6.
* RATIO SHOULD BE APPROXIMATELY 1.0
UNIT FEET KIP
JOINT COORDINATES
1 0 0 0; 2 30 0 0;
MEMBER INCIDENCES
1 1 2;
MEMBER PROPERTY AMERICAN
1 TABLE ST W18X35
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 MZ
LOAD 1
MEMBER LOAD
1 CON GY -20 7.5
1 CON GY -20 15
1 CON GY -20 22.5
PERFORM ANALYSIS
UNIT INCHES KIP
PARAMETER 1
CODE AISC
DMAX 19 ALL
MAIN 1 ALL
BEAM 1 ALL
FYLD 36 ALL
UNL 90 ALL
TRACK 2 ALL
SELECT OPTIMIZED
FINISH
STAAD Output
STAAD.PRO MEMBER SELECTION - (AISC 9TH EDITION) v1.0
***********************************************
|--------------------------------------------------------------------------|
| Y PROPERTIES |
|************* | IN INCH UNIT |
| * |=============================| ===|=== ------------ |
|MEMBER 1 * | AISC SECTIONS | | AX = 25.30 |
| * | ST W18X86 | | --Z AY = 7.95 |
|DESIGN CODE * | | | AZ = 11.38 |
| AISC-1989 * =============================== ===|=== SY = 31.53 |
| * SZ = 166.30 |
| * |<---LENGTH (FT)= 30.00 --->| RY = 2.63 |
|************* RZ = 7.78 |
| |
| 300.0 (KIP-FEET) |
|PARAMETER | L1 STRESSES |
|IN KIP INCH | L1 L1 IN KIP INCH |
|--------------- + L1 L1 -------------|
| KL/R-Y= 136.88 | FA = 7.97 |
| KL/R-Z= 46.29 + L1 fa = 0.00 |
| UNL = 90.00 | L1 FCZ = 23.76 |
| CB = 1.00 + FTZ = 23.76 |
| CMY = 0.85 | L1 L1 FCY = 27.00 |
| CMZ = 0.85 + FTY = 27.00 |
| FYLD = 36.00 |L0 L0 fbz = 21.65 |
| NSF = 1.00 +---+---+---+---+---+---+---+---+---+---| fby = 0.00 |
| DFF = 0.00 -16.7 Fey = 7.97 |
| dff= 0.00 ABSOLUTE MZ ENVELOPE Fez = 69.68 |
| (KL/R)max = 136.88 (WITH LOAD NO.) FV = 14.40 |
| fv = 1.26 |
| |
| MAX FORCE/ MOMENT SUMMARY (KIP-FEET) |
| ------------------------- |
| |
| AXIAL SHEAR-Y SHEAR-Z MOMENT-Y MOMENT-Z |
| |
| VALUE 0.0 30.0 0.0 0.0 300.0 |
| LOCATION 0.0 0.0 0.0 0.0 15.0 |
| LOADING 0 1 0 0 1 |
| |
|**************************************************************************|
|* *|
|* DESIGN SUMMARY (KIP-FEET) *|
|* -------------- *|
|* *|
|* RESULT/ CRITICAL COND/ RATIO/ LOADING/ *|
| FX MY MZ LOCATION |
| ====================================================== |
| PASS AISC- H1-3 0.911 1 |
| 0.00 T 0.00 -300.00 15.00 |
|* *|
| |
|--------------------------------------------------------------------------|