EN13001 – a crane standard EN 13001-3-1+A2 Limits States and proof competence of steel structure.


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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 a linear relationship between load actions and load effects.

Static Strength

For static strength, the default method is the Limit State Method. If the Allowable Stress design method is used press to specify safety factors for Individual Loads and Load Sets. The limit design stress for normal stresses:

EN13001_limit_design_stress_for normal_stresses_formula

For shear stresses:

EN13001_limit_design_stress_for shear_stresses_formula

Where EN13001_YRm formula

is the general resistance factor (EN13001-2).

is the specific resistance factor for the material.

Press Button_define_characteristic_with_specific_resistance_factor to define characteristic with specific resistance factor.

In case of plane states of stresses when von Mises stresses are not used it shall additionally be proven that:


Fatigue Strength

Fatigue Strength can be calculated using 2 methods: Direct Use of Stress History and Simplified Method (Chapter 6.5.3).


In the direct use of stress history method Stress History Parameter is calculated automatically based on stress ranges and stress history (Fatigue Group):

Example: Fatigue Group with a total amount of cycles 4 million:


Stress History Parameter:


ν is the relative total number of occurrences of stress ranges;
kmis the stress spectrum factor dependent on m;
Δ σi is the stress range i;
Δ^σthe maximum stress range;
niis the number of occurrences of stress range i;
EN13001_Nt formula is the total number of occurrences of tress ranges during the design life of the crane;
mis the slope constant of the logΔσ—logN -curve of the component under consideration.

The limit design stress for fatigue


ΔσRdis the limit design stress range
Δσc ia the characteristic fatigue strength (see Annex D and Annex H)
mis the slope constant of the ogΔσ—logN curve (see Annex D and Annex H)
ϒmfis the fatigue strenght specific resistance factor (see Table 9)
smis the stress history parameter

The combined effect of normal and shear stresses:


Check with the simplified method is optional, stress history parameter is user input and fatigue is calculated for one stress range (Load Group) without summation.

For Fatigue strength resistance factor, notch class, slope factor, and reduced stress range have to be defined.

Fatigue strength specific resistance factor is an elemental characteristic. Chapter 6.1 Table 9:

Accessibility for inspection Fail-safe detail Non fail-safe detail
Without hazard for personsb With hazard for persons
Detail accessible without disassembly 1.0 1.05 1.15
Detail accessible by disassembly 1.05 1.10 1.20
Non-accessible detail N/A 1.15 1.25

Notch Class and Slope Factor should be defined for different direction: X - parallel to the weld, Y - perpendicular, XY - Shear based on Annex D.


Press Button_define_notch_class to define Notch class.

Example of classification:


In non-welded details or stress-relieved welded details the effective stress range may be calculated by adding the tensile portion of the stress range and 60% of the magnitude of the compressive portion of the stress range:


By default, the reduced range is set to Not Reduced. Press Button_define_characteristic_with_specific_resistance_factor to specify the selection which should use reduced stress range:


It is important to set this value for each material. Standard checks if all Yield Stress is not equal to zero:


If count > 0, then press Button_materials EN13001 to edit Yield Stress and Tensile Strength:

EN13001 Material_fatifue_parameters