V. AISC LRFD - Channel Shape Capacity
To check the adequacy of a fully braced C shape to carry a uniformly distributed load of 1.5 kips/ft.
Comparison
The reported STAAD.Pro value is based on the term MNZ in the STAAD.Pro output.
| Result Type | Theory | STAAD.Pro | Difference |
|---|---|---|---|
| Maximum total Factored Load, W (kips) | 31.8 | 31.8 | none |
| ϕbMc | 635 | 635.1 | none |
STAAD Input
The file C:\Users\Public\Public Documents\STAAD.Pro CONNECT Edition\Samples\ Verification Models\09 Steel Design\US\AISC\AISC LRFD - Channel Shape Capacity.STD is typically installed with the program.
STAAD SPACE BENDING CAPACITY PER AISC LRFD 3RD ED
START JOB INFORMATION
ENGINEER DATE 23-Sep-18
END JOB INFORMATION
*
* TABLE 5-9, PAGE 5-120, AISC LRFD 3RD ED.
* OBJECTIVE : TO CHECK THE ADEQUACY OF A C SHAPE.
*
* BEAM IS FULLY BRACED. ACCORDING TO ABOVE REFERENCE,
* CAPACITY OF A 20 FT LONG C12X25 IS 31.8/20=1.59 KIP/FT
*
UNIT FEET KIP
JOINT COORDINATES
1 0 0 0; 2 20 0 0;
MEMBER INCIDENCES
1 1 2;
MEMBER PROPERTY AMERICAN
1 TABLE ST C12X25
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 UNI GY -1.5
PERFORM ANALYSIS
UNIT INCHES KIP
PARAMETER 1
CODE LRFD
MAIN 1 ALL
* FULLY BRACED CONDITION IS ACHIEVED WITH A UNT OF 1.0 INCH
UNT 1 ALL
FYLD 36 ALL
TRACK 2 ALL
CHECK CODE ALL
FINISH
STAAD Output
STAAD.PRO CODE CHECKING - (LRFD 3RD EDITION) v1.0 ******************************************** |--------------------------------------------------------------------------| | Y PROPERTIES | |************* | IN INCH UNIT | | * |=============================| |=== ------------ | |MEMBER 1 * | AISC SECTIONS | | AX=0.7340E+1 | | * | ST C12X25 | | --Z AY=0.4644E+1 | |DESIGN CODE * | | | AZ=0.2037E+1 | | LRFD 2001 * =============================== |=== PY=0.3820E+1 | | * PZ=0.2940E+2 | | * |<---LENGTH (FT)= 20.00 --->| RY=0.7786E+0 | |************* RZ=0.4429E+1 | | | | 75.0 (KIP-FEET) | |PARAMETER | L1 L1 L1 CAPACITIES | |IN KIP INCH | IN KIP INCH | |--------------- + L1 L1 -------------| | KL/R-Y= 308.23 | PNC=0.1634E+2| | KL/R-Z= 54.18 + L1 L1 pnc=0.0000E+0| | UNL = 1.00 | PNT=0.2378E+3| | CB = 1.00 + L1 L1 pnt=0.0000E+0| | PHIC = 0.85 | MNZ=0.9526E+3| | PHIB = 0.90 + mnz=0.9000E+3| | FYLD = 36.00 |L0 L0 MNY=0.9102E+2| | NSF = 1.00 +---+---+---+---+---+---+---+---+---+---| mny=0.0000E+0| | DFF = 0.00 -4.2 VN =0.9028E+2| | dff = 0.00 ABSOLUTE MZ ENVELOPE vn =0.0000E+0| | (WITH LOAD NO.) | | | | MAX FORCE/ MOMENT SUMMARY (KIP-FEET) | | ------------------------- | | | | AXIAL SHEAR-Y SHEAR-Z MOMENT-Y MOMENT-Z | | | | VALUE 0.0 15.0 0.0 0.0 75.0 | | LOCATION 0.0 0.0 0.0 0.0 10.0 | | LOADING 0 1 0 0 1 | | | |**************************************************************************| |* *| |* DESIGN SUMMARY (KIP-FEET) *| |* -------------- *| |* *| |* RESULT/ CRITICAL COND/ RATIO/ LOADING/ *| | FX MY MZ LOCATION | | ====================================================== | | PASS LRFD-H1-1B-C 0.945 1 | | 0.00 C 0.00 -75.00 10.00 | |* *| |**************************************************************************| | | |--------------------------------------------------------------------------|