V. AISC ASD - Square Tube Compression Capacity
Determine the axial compression capacity of a square 8x8x5/8 structural tube.
Comparison
The reported STAAD.Pro value is obtained by multiplying FA times AX from the STAAD.Pro output = 14.15(17.40) = 246.2.
| Result Type | Theory | STAAD.Pro | Difference | |
|---|---|---|---|---|
| Axial capacity (kips) | 247 | 246.2 | <1% | |
STAAD Input
The file C:\Users\Public\Public Documents\STAAD.Pro CONNECT Edition\Samples\ Verification Models\09 Steel Design\US\AISC\AISC ASD - Square Tube Compression Capacity.STD is typically installed with the program.
STAAD SPACE AISC VERIFICATION PROBLEM FOR AXIAL COMPRESSION CAPACITY.
START JOB INFORMATION
ENGINEER DATE 03-Sep-18
END JOB INFORMATION
* PAGE 3-41 OF 9TH ED. AISC-ASD. SQUARE TUBE 8X8X5/8, 25 FT LONG.
* FA SHOULD BE APPROX. 247/17.40 = 14.20 KSI
UNIT FEET KIP
JOINT COORDINATES
1 0 0 0; 2 0 25 0;
MEMBER INCIDENCES
1 1 2;
START USER TABLE
TABLE 1
UNIT INCHES KIP
TUBE
TUB808010
17.4 8 8 0.625 153 153 258 7.48 7.48
END
UNIT FEET KIP
UNIT INCHES KIP
MEMBER PROPERTY
1 UPTABLE 1 TUB808010
*1 TA ST TUB808010
DEFINE MATERIAL START
ISOTROPIC STEEL_50_KSI
E 29000
POISSON 0.3
DENSITY 0.000283
ALPHA 6.5e-06
DAMP 0.03
TYPE STEEL
STRENGTH FY 50 FU 62 RY 1.5 RT 1.2
END DEFINE MATERIAL
UNIT FEET KIP
CONSTANTS
MATERIAL STEEL_50_KSI ALL
SUPPORTS
1 FIXED
LOAD 1
JOINT LOAD
2 FY -240
PERFORM ANALYSIS
UNIT INCHES KIP
PARAMETER 1
CODE AISC
FYLD 46 ALL
TRACK 2 ALL
CHECK CODE ALL
FINISH
STAAD Output
STAAD.PRO CODE CHECKING - (AISC 9TH EDITION) v1.0 ******************************************** |--------------------------------------------------------------------------| | Y PROPERTIES | |************* | IN INCH UNIT | | * |=============================| |=====| ------------ | |MEMBER 1 * | UPT | | | AX = 17.40 | | * | UP TUB808010 | | |--Z AY = 7.48 | |DESIGN CODE * | | | | AZ = 7.48 | | AISC-1989 * =============================== |=====| SY = 38.25 | | * SZ = 38.25 | | * |<---LENGTH (FT)= 25.00 --->| RY = 2.97 | |************* RZ = 2.97 | | | | 0.0 (KIP-FEET) | |PARAMETER |L0 L0 L0 L0 L0 L0 L0 L0 L0 L0 L0 STRESSES | |IN KIP INCH |L0 L0 L0 L0 L0 L0 L0 L0 L0 L0 L0 IN KIP INCH | |--------------- +L0 L0 L0 L0 L0 L0 L0 L0 L0 L0 L0 -------------| | KL/R-Y= 101.17 |L0 L0 L0 L0 L0 L0 L0 L0 L0 L0 L0 FA = 14.15 | | KL/R-Z= 101.17 +L0 L0 L0 L0 L0 L0 L0 L0 L0 L0 L0 fa = 13.79 | | UNL = 300.00 |L0 L0 L0 L0 L0 L0 L0 L0 L0 L0 L0 FCZ = 27.60 | | CB = 1.00 +L0 L0 L0 L0 L0 L0 L0 L0 L0 L0 L0 FTZ = 27.60 | | CMY = 0.85 |L0 L0 L0 L0 L0 L0 L0 L0 L0 L0 L0 FCY = 27.60 | | CMZ = 0.85 +L0 L0 L0 L0 L0 L0 L0 L0 L0 L0 L0 FTY = 27.60 | | FYLD = 46.00 |L0 L0 L0 L0 L0 L0 L0 L0 L0 L0 L0 fbz = 0.00 | | NSF = 1.00 +---+---+---+---+---+---+---+---+---+---| fby = 0.00 | | DFF = 0.00 0.0 Fey = 14.59 | | dff= 0.00 ABSOLUTE MZ ENVELOPE Fez = 14.59 | | (KL/R)max = 101.17 (WITH LOAD NO.) FV = 18.40 | | fv = 0.00 | | | | MAX FORCE/ MOMENT SUMMARY (KIP-FEET) | | ------------------------- | | | | AXIAL SHEAR-Y SHEAR-Z MOMENT-Y MOMENT-Z | | | | VALUE 240.0 0.0 0.0 0.0 0.0 | | LOCATION 0.0 0.0 0.0 0.0 0.0 | | LOADING 1 0 0 0 0 | | | |**************************************************************************| |* *| |* DESIGN SUMMARY (KIP-FEET) *| |* -------------- *| |* *| |* RESULT/ CRITICAL COND/ RATIO/ LOADING/ *| | FX MY MZ LOCATION | | ====================================================== | | PASS AISC- H1-1 0.975 1 | | 240.00 C 0.00 0.00 0.00 | |* *| | | |--------------------------------------------------------------------------|