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.
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:
For shear stresses:
is the general resistance factor (EN13001-2).
is the specific resistance factor for the material.
Press 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 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;|
|km||is the stress spectrum factor dependent on m;|
|Δ σi||is the stress range i;|
|Δ^σ||the maximum stress range;|
|ni||is the number of occurrences of stress range i;|
|is the total number of occurrences of tress ranges during the design life of the crane;|
|m||is the slope constant of the logΔσ—logN -curve of the component under consideration.|
The limit design stress for fatigue
|ΔσRd||is the limit design stress range|
|Δσc||ia the characteristic fatigue strength (see Annex D and Annex H)|
|m||is the slope constant of the ogΔσ—logN curve (see Annex D and Annex H)|
|ϒmf||is the fatigue strenght specific resistance factor (see Table 9)|
|sm||is 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|
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 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 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 to edit Yield Stress and Tensile Strength: