V. I Section in Compression

Determine the capacity of a South African I-section column in axial compression per South African steel design code (SANS10162-1:1993). Column is braced at its ends for both axes.

Reference

Example 4.3.4.1, page 4.18, Structural Steel Design to SABS 0162-1 1993 (Limit States Design). Greg Parrott, 1st edition, Shades Technical Publications. 1993

Given

FYLD = 300 Mpa

Length = 6,000 mm

Comparison

Table 1. Comparison of results
Criteria	Reference	STAAD.Pro	Difference
Axial Compressive Strength (kN)	1,516	1,516	none

Input File

The file C:\Users\Public\Public Documents\STAAD.Pro CONNECT Edition\Samples\ is typically installed with the program.

STAAD PLANE
START JOB INFORMATION
* ENGINEER DATE
END JOB INFORMATION
UNIT METER KN
JOINT COORDINATES
1 0 0 0; 2 0 6 0;
MEMBER INCIDENCES
1 1 2;
MEMBER PROPERTY SAFRICAN
1 TABLE ST 356X67UB
DEFINE MATERIAL START
ISOTROPIC STEEL
E 1.99947e+008
POISSON 0.3
DENSITY 76.8191
ALPHA 6e-006
DAMP 0.03
TYPE STEEL
STRENGTH FY 248210 FU 399894 RY 1.5 RT 1.2
END DEFINE MATERIAL
UNIT MMS KN
CONSTANTS
MATERIAL STEEL ALL
UNIT METER KN
SUPPORTS
1 FIXED
LOAD 1 LOADTYPE None  TITLE LOAD CASE 1
JOINT LOAD
2 FY -1500
PERFORM ANALYSIS
PARAMETER 1
CODE SANS10162-1: 1993
LZ 6 ALL
LY 3 ALL
FU 450000 ALL
BEAM 1 ALL
NSF 0.85 ALL
TRACK 2 ALL
FYLD 300000 ALL
CHECK CODE ALL
FINISH

Output

                **************************************
                       STAAD.PRO CODE CHECKING
                (SOUTHAFRICAN STEEL/SANS10162-01:1993 )
                **************************************
  PROGRAM CODE REVISION V1.0_SANS10162-1: 1993
 ALL UNITS ARE - KNS  MET  (UNLESS OTHERWISE Noted)
 MEMBER     TABLE       RESULT/   CRITICAL COND/     RATIO/     LOADING/
                          FX            MY             MZ       LOCATION
 =======================================================================
       1 ST   356X67UB                 (SOUTHAFRICAN SECTIONS)
                         PASS       COMPRESSION        0.989         1
                      1500.00            0.00           0.00        0.00
   MEMBER PROPERTIES (UNIT = CM)
   -----------------------------
   SECTION CLASS =   1
   CROSS SECTION AREA =  8.55E+01   MEMBER LENGTH =  6.00E+02
   IZ =  1.95E+04   SZ =  1.07E+03   PZ =  1.21E+03
   IY =  1.36E+03   SY =  1.57E+02   PY =  2.43E+02
   MATERIAL PROPERTIES (UNIT = MPA)
   --------------------------------
   FYLD = 300.0   FU = 450.0
   SECTION CAPACITIES (UNIT - KN,M)
   ---------------------------------
   CRY =  1.516E+03   CRZ =  2.038E+03
   CTORFLX =  1.516E+03
   TENSILE CAPACITY     =  2.308E+03   COMPRESSIVE CAPACITY =  1.516E+03
   FACTORED MOMENT RESISTANCE : MRY =  6.561E+01   MRZ =  3.267E+02
   FACTORED SHEAR RESISTANCE  : VRY =  5.903E+02   VRZ =  6.461E+02
   MISCELLANEOUS INFORMATION
   --------------------------
   NET SECTION FACTOR FOR TENSION =  0.850
   UNSUPPORTED LENGTH OF THE COMPRESSION FLANGE (M) =  6.000
   OMEGA-1 (Y-AXIS) = 1.00   OMEGA-1 (Z-AXIS) = 1.00   OMEGA-2 = 1.00
   SHEAR FORCE (KNS) : Y AXIS =  0.000E+00   Z AXIS =  0.000E+00
   SLENDERNESS RATIO OF WEB (H/W) =  3.65E+01
   KL/RY =   75.220   KL/RZ =   39.730   ALLOWABLE KL/R =  200.000