Checking according to EN13001 standard in SDC Verifier

Crane Standard EN 13001-3-1+A2 Limits States and proof competence of steel structure is implemented in SDC Verifier. The standard is to be used together with EN13001-1 and EN13001-2:

EN13001 standard setting window in SDC Verifier
EN 13001-3-1 standard deals only with the limit state method. The allowable stress method is reliable in specific cases – for cranes where all masses act only unfavorable with linear relationship between load actions and load effects.

To account for the uncertainty of fatigue strength values and possible consequences of fatigue damage – fatigue strength specific resistance factor should be specified:

Accessibility for inspection Fail-safe detailNon fail-safe detail
Without hazards for persons bWith hazards for persons
Detail accessible without disassembly1,01,051,15
Detail accessible by disassembly1,051,101,20
Non-accessible detailN/A a1,151,25

Characteristic fatigue strength (fatigue strength at 2 million cycles) and slope constant have to be defined to calculate limit design stress range:

\(\Delta \sigma _{Rd} =\frac{\Delta \sigma _{c}}{\gamma _{mf} \times \sqrt[m]{s_{m}}}\)

Where

  • Δσc  —  Is the characteristic fatigue strength (Annex D and Annex H of standard)
  • m  —  Is the slope constant of the log Δσ – logN curve (Annex D and Annex H of EN13001 standard)
  • ϒmf  —  Is the fatigue strength specific resistance factor (see table above)
  • sm  —  Is the stress history parameter

Characteristic fatigue strength

Fatigue Strength Parallel to the weld:

See how SDC Verifier calculates fatigue strength parallel to the weld

Detail
No.
Δσc
Δṫc
Constructional detailRequirements
3.7m = 3Visualisation. Normal stress in weld direction

Normal stress in weld direction

Special conditions:

  • no irregularities from start-stop-points in quality level + 1 NC
  • welding with restraint of shrinkage – 1 NC
180Continuous weld, quality level B
140Continuous weld, quality level C
80Intermittent weld, quality level C

Fatigue Strength Perpendicular to the weld for welded parts:

See how SDC Verifier calculates fatigue strength perpendicular to the weld

3.9m = 3

 

 

 

 

 

 

 

 

 

45

 

Visualisation. Cross or T-joint, symmetric double fillet weld
Stress in weld throat

Basic conditions:

  • continuous weld

Special conditions:

  • automatic welding, no initial points +1 NC
  • welding with restraint of shrinkage – 1 NC

 

\( \sigma _{w} = F/(2\times a\times l)\)
71Quality level BStress in the loaded plate at weld toe
63Quality level C

Fatigue Strength Perpendicular to the weld for non-welded parts:

3.28Continuous component to which parts are welded transversally

Continuous component to which parts are welded transversally

Basic conditions:

  • plate thickness t≤ 12 mm
  • c ≥ 10 mm
  • quality level D not allowed for K-weld

Special conditions:

  • plate thickness t > 12 mm
    (Double fillet welds only) -1 NС
  •  c < 10 mm -1 NС
  • K-weld instead  of double fillet weld +1 NC
  • quality level D instead of C  – 1 NC
112Double fillet weld, quality level B*
100Double fillet weld, quality level B
90Double fillet weld, quality level C
80Single fillet weld, quality level B, C
80Partial penetration V-weld on remaining backing, quality level  B, C

Fatigue Strength Shear direction to the welds:

See how SDC Verifier calculates fatigue strength in shear direction to the weld

Detail
No.
Δσc
Δṫc
N|mm
2
Constructional detailRequirements
3.34m = 5Continuous groove weld

Continuous groove weld, single or double fillet weld under uniform shear flow

Basic conditions:

  • quality level C
  • components with usual residual stresses

Special conditions:

    • components with considerable residual stresses (e.g. joint of components with restraint of shrinkage) -1 NC
    • no initial points +1 NC
112With full penetration
90Partial penetration

SDC Verifier defines all fatigue strength classification

Edit Fatigue Strength Classification in SDC Verifier

Fatigue Strength Parallel to the weld calculated in SDC Verifier
Fatigue Strength Parallel to the weld calculated in SDC Verifier
Fatigue Strength Perpendicular to the weld calculated in SDC-Verifier
Fatigue Strength Perpendicular to the weld calculated in SDC Verifier
Fatigue Strength Perpendicular to the weld calculated in SDC Verifier
Fatigue Strength Perpendicular to the weld calculated in SDC Verifier
Fatigue Strength Perpendicular to the weld calculated in SDC Verifier
Fatigue Strength Perpendicular to the weld calculated in SDC Verifier
Fatigue Strength in Shear Direction to the weld calculated in SDC Verifier
Fatigue Strength in Shear Direction to the weld calculated in SDC Verifier

For Direct use of stress history option SDC Verifier will calculate automatically stress history for slope constant 3 and 5 and use it to calculate limit design stress range. Alternatively, user can set manually class S for different directions (parallel, perpendicular to the weld).

SDC Verifier calculate cumulative damage based on Palmgren-Miner rule:

\(\sum ^{k}_{i=1}\frac{n_{i}}{N_{i}} \ =\ C\)

Where

  • ni is the number of cycles accumulated at stress Si
  • C is the fraction of life consumed by exposure to the cycles at the different stress levels

Cumulative damage according to EN13001 calculated in SDC Verifier:

Cumulative damage according to EN13001 calculated in SDC Verifier: