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 2023\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 | |* *| | | |--------------------------------------------------------------------------|