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.
Problem
Three concentrated loads of 20 kips each at quarter span points. Desired beam depth of 18 in.
| Fy =36 ksi |
Comparison
| Result Type | Theory | STAAD.Pro | Difference | |
|---|---|---|---|---|
| Selected section | W18x86 | W18x86 | none | |
STAAD Input
The file C:\Users\Public\Public Documents\STAAD.Pro CONNECT Edition\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 | |* *| | | |--------------------------------------------------------------------------|