V. AIJ 2005 UPT I

Verify the bending capacity and compression capacity of an I section beam.

Details

The member is a 5 m long simply-supported beam. The section used is an I300X150X8. The steel has a yield strength of 235 MPa, a modulus of elasticity of 205×(10)³ MPa, and a shear modulus of 79×(10)³ MPa.

The member is subject to the following loads:

a -10 kN concentrated force at mid-span in the global Y direction
a 3 kN concentrated force at mid-span in the global Z direction
a -40 kN axial force
a -0.2 kN·m concentrated moment at the left end

Validation

Section Properties

Dimensions:

Leg, D = 300 mm
Width, B = 150 mm
Thickness of web, t_w = 8 mm
Thickness of flange, t_f = 13 mm

Depth of web, d = D - 2t_f = 274 mm

Area, A_x = 6,092 mm²

Moment of inertia about major axis,

Moment of inertia about minor axis,

Major axis section modulus,

Minor axis section modulus,

Torsional constant,

Warping constant,

Radius of gyration about major axis,

Radius of gyration about minor axis,

Section Classification

For webs of beams in bending (Cl. 8.5):

Depth to thickness ratio is OK.

For flanges of beams in bending (Cl. 8.3):

Depth to thickness ratio is OK.

Allowable Compressive Stress

The slenderness ratio of compression members (Cl. 11.1):

Slenderness ratio dividing elastic and inelastic buckling (Cl no 5.5):

λ > Λ, so the allowable compressive stress is given by Cl. 5.4:

Allowable Flexural Stress

Distance between braced points of the compression flange, l_b = 5,000 mm.

The yield moment,

The modification factor for allowable flexural stress (Cl. 5.13):

The elastic lateral-torsional buckling moment (Cl 5.12):

The maximum slenderness ratio to achieve the plastic strength (Cl. 5.12):

The elastic slenderness limit:

Slenderness ratio of the flexural member,

Here, pλ_b < λ_b ≤ eλ_b , so:

Results

Table 1.
Result Type	Reference	STAAD.Pro	Difference	Comments
Allowable compressive stress (MPa)	44.92	44.92	none
Allowable flexural stress (MPa)	86.68	86.74	negligible

STAAD.Pro Input

The file C:\Users\Public\Public Documents\STAAD.Pro 2024\Samples \Verification Models\09 Steel Design\Japan\AIJ 2005 UPT I.STD is typically installed with the program.

STAAD SPACE
START JOB INFORMATION
ENGINEER DATE 22-Oct-18
END JOB INFORMATION
INPUT WIDTH 79
UNIT METER KN
JOINT COORDINATES
3 1 0 2; 4 6 0 2;
MEMBER INCIDENCES
2 3 4;
START USER TABLE
TABLE 1
UNIT METER KN
GENERAL
GE_H300X150X6.5X9
0.004678 0.3 0 0.15 0 7.21e-05 5.08e-06 9.95e-08 0.000480667 6.77333e-05 -
0.00195 0.0018 0 0 1.07545e-07 0.256
TABLE 2
UNIT METER KN
WIDE FLANGE
WF_H300X150X6.5X9
0.004678 0.3 0.0065 0.15 0.009 7.21e-05 5.08e-06 9.95e-08 0.00195 0.0018
WF2_H300X150X6.5X9
0.004678 0.3 0.0065 0.15 0.009 7.21e-05 5.08e-06 9.95e-08 0.00195 -
0.0018 0.15 0.009
TABLE 3
UNIT METER KN
ISECTION
IS_I300X150X8
0.3 0.008 0.3 0.15 0.013 0.15 0.013 0.0024 0.0026 2.69e-07
END
DEFINE MATERIAL START
ISOTROPIC STEEL
E 2.05e+08
POISSON 0.3
DENSITY 76.8195
ALPHA 1.2e-05
DAMP 0.03
TYPE STEEL
STRENGTH RY 1.5 RT 1.2
END DEFINE MATERIAL
MEMBER PROPERTY JAPANESE
2 UPTABLE 3 IS_I300X150X8
CONSTANTS
MATERIAL STEEL ALL
SUPPORTS
3 PINNED
4 FIXED BUT FX MY MZ
LOAD 1 LOADTYPE None  TITLE LOAD CASE 1
MEMBER LOAD
2 CON GY -10
2 CON GZ 3
JOINT LOAD
4 FX -40
3 MX 0.2
PERFORM ANALYSIS
PARAMETER 1
CODE JAPANESE 2005
TRACK 2 ALL
CHECK CODE ALL
PRINT MEMBER PROPERTIES ALL
FINISH

STAAD.Pro Output

                        STAAD.Pro CODE CHECKING - (AIJ-2005)   V2.1
                        ***********************
ALL UNITS ARE IN - METE  KN   (U.N.O.)
|-----------------------------------------------------------------------------|
|   Member No:       2        Profile  : IS_I300X150X8 (UPT)                    |
|  Ratio:    0.621  (PASS)  Reference: Eq.6.1            Loadcase:       1    |
|-----------------------------------------------------------------------------|
|  Location:    2.500  Criteria:     Stress      Load Case:     1  (Permanent)|
|  Px:(C)       40.000       Vy:         5.000          Vz:      -1.500       |
|  Tx:           0.200       My:        -3.750          Mz:     -12.500       |
|-----------------------------------------------------------------------------|
| SECTION PROPERTIES AT DISTANCE: 2500.000 MM              (UNIT: MM)         |
|  Ax:     6.09200E+03       Az: 2.60000E+03            Ay: 2.40000E+03       |
|  Iz:     9.40786E+07       Iy: 7.32419E+06             J: 2.69000E+05       |
|  Zz:     6.27191E+05       Zy: 9.76559E+04            Zx: 2.06923E+04       |
|  iZ:     1.24270E+02       iY: 3.46737E+01            Iw: 1.50822E+11       |
|-----------------------------------------------------------------------------|
| MATERIAL PROPERTIES   (Unit: N/mm2)                                         |
|  Fy:         235.000      E :   205000.000          G :     79000.000       |
|-----------------------------------------------------------------------------|
| DESIGN PROPERTIES                                                           |
|  Member Length:     5.000      Lz:     5.000 Ly:     5.000  UNL:      5.000 |
| DESIGN PARAMETERS                                                           |
|  Kz:   1.000     Ky:   1.000   NSF:  1.000   Cb:   0.000    pλb:  0.000     |
|-----------------------------------------------------------------------------|
| CRITICAL SLENDERNESS (Compression)                                          |
|  Actual :    144.202      Allowable :    200.000      Ratio :  0.721        |
|-----------------------------------------------------------------------------|
| Section Classification Results :    Width to Thickness Ratios               |
|-----------------------------------------------------------------------------|
|            Compression              |             Bending                   |
|-----------------------------------------------------------------------------|
|  LC#   |    Actual   |   Allowable  |   LC#   |    Actual   |   Allowable   |
|-----------------------------------------------------------------------------|
|      1 |    34.2500  |     47.2567  |      1  |    34.2500  |     70.8850   |
|-----------------------------------------------------------------------------|
| CHECKS                              |Env|     Stresses    |                 |
|              | Loc. | Demand |  L/C |Typ| Actual | Allow  |Ratio |   Ref.   |
|              |(MET) |(KN-MET)|      |   |(N/mm2) |(N/mm2) |      |          |
|--------------|------|--------|------|---|--------|--------|------|----------|
| Tension      |  -   |   -    |  -   | - |   -    |  156.67|  -   | Eq.5.1   | 
| Compression  | 0.000|   40.00|     1| P |    6.57|   44.92| 0.146| Eq.5.4   |  
| Bending Z (T)| 2.500|  -12.50|     1| P |   19.93|  156.67| 0.127| Eq.5.1   | 
| Bending Z (C)| 2.500|  -12.50|     1| P |   19.93|   86.74| 0.230| Eq.5.8   |  
| Bending Y (T)| 2.500|   -3.75|     1| P |   38.40|  156.67| 0.245| Eq.5.1   | 
| Bending Y (C)| 2.500|   -3.75|     1| P |   38.40|  156.67| 0.245| Eq.5.1   | 
| Shear Z      | 0.000|   -1.50|     1| P |    0.58|   90.45| 0.006| Eq.5.2   | 
| Shear Y      | 0.000|    5.00|     1| P |    2.08|   90.45| 0.023| Eq.5.2   | 
| Comp+ Bend C | 2.500|   -    |     1| P |   -    |    -   | 0.621| Eq.6.1   | 
| Comp+ Bend T | 2.500|   -    |     1| P |   -    |    -   | 0.330| Eq.6.2   | 
| Ten + Bend T | 2.500|   -    |     1| P |   -    |    -   | 0.372| Eq.6.3   | 
| Ten + Bend C | 2.500|   -    |     1| P |   -    |    -   | 0.475| Eq.6.4   | 
| Von-Mises    | 2.500|   -    |     1| P |   68.05|  156.67| 0.434| Eq.5.24  | 
|                                                                             |
| INTERMEDIATE RESULTS (Bending)                                              |
|  Me: 1.4083E+02 KN-MET  My: 1.4739E+02 KN-MET   pλb:   0.300  C:  1.000     |
|                                                                             |
| INTERMEDIATE RESULTS (Von-Mises)                                            |
|  Sigmax:    64.896 N/mm2   Tou:    11.827 N/mm2  fm:    68.053 N/mm2        |
|-----------------------------------------------------------------------------|