V. AISC ASD - Rectangular Tube Compression Capacity
Determine the axial compression capacity of a rectangular 7x5x3/8 structural tube.
Comparison
The reported STAAD.Pro value is obtained by multiplying FA times AX from the STAAD.Pro output = 6.32(8.08) = 51.06.
| Result Type | Theory | STAAD.Pro | Difference | |
|---|---|---|---|---|
| Axial capacity (kips) | 51 | 51.1 | <1% | |
STAAD Input
The file C:\Users\Public\Public Documents\STAAD.Pro CONNECT Edition\Samples\ Verification Models\09 Steel Design\US\AISC\AISC ASD - Rectangular 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 3-49 OF 9TH ED. AISC-ASD. RECTANGULAR TUBE 7X5X3/8, 25 FT LONG.
* FA SHOULD BE APPROX. 51/8.08 = 6.31 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
TUB70506
8.08 7 5 0.375 52.2 30.8 64.2 3.97 2.98
END
UNIT INCHES KIP
MEMBER PROPERTY AMERICAN
1 UPTABLE 1 TUB70506
*1 TA ST TUB70506
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 -50
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 = 8.08 | | * | UP TUB70506 | | |--Z AY = 3.97 | |DESIGN CODE * | | | | AZ = 2.98 | | AISC-1989 * =============================== |=====| SY = 12.32 | | * SZ = 14.91 | | * |<---LENGTH (FT)= 25.00 --->| RY = 1.95 | |************* RZ = 2.54 | | | | 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= 153.66 |L0 L0 L0 L0 L0 L0 L0 L0 L0 L0 L0 FA = 6.32 | | KL/R-Z= 118.03 +L0 L0 L0 L0 L0 L0 L0 L0 L0 L0 L0 fa = 6.19 | | 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 = 6.32 | | dff= 0.00 ABSOLUTE MZ ENVELOPE Fez = 10.72 | | (KL/R)max = 153.66 (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 50.0 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 0.978 1 | | 50.00 C 0.00 0.00 0.00 | |* *| | | |--------------------------------------------------------------------------|