AS 4100 Fatigue (2020)

This Standard provides designers of steel structures with specifications for fatigue assessment of steel structural members and connections subject to repeated loading. It also implements Section 11 covering fatigue design criteria, SN curve methodology, stress range calculations, and damage accumulation for all types of structural elements including welded connections.

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Press to Set Standard Custom Settings

According to the calculation procedure, Beam Length for Y and Z direction is required. Data from Beam Member Finder is used automatically. If beam members are not recognized press

Options

Weld Type - specifies the type of weld connection based on the "W Type" classification. Used to determine if the connection is "Transverse Fillet or Butt Welded" or "Other" type. Transverse fillet welds or butt welds may have the βtf thickness correction parameter calculated in a specific way according to Section 11.1.6.;

Multiplying Factor - is used to multiply stress range in truss connections involving circular and rectangular hollow sections according to Section 11, Tables 11.3.1(A) and (B). Default value should be 1.0. This characteristic allows adjustment for specific connection types that require stress range amplification;

Element Thickness - specifies thickness of elements other than plates. Default value should be 0, which means thickness will be obtained from plate recognition. For non-plate elements, this parameter allows manual specification of element thickness for proper fatigue calculations;

Detail Category - Detail classification according to Section 11, Table 11.5.1. This classification is used for both normal and shear stresses. For shear stresses, valid categories are limited to "80" or "100" according to Table 11.5.1. The detail category determines the appropriate SN curve for fatigue assessment;

Capacity factor, Phi - Capacity factor φ applied in fatigue calculations according to Table 3.4. This factor is used in the calculation of allowable number of stress cycles and provides appropriate safety margin in fatigue design;

Use Hot Spot Stress - when enabled, uses hot spot stress methodology for fatigue assessment. This approach is typically used for complex geometries where standard detail categories may not be directly applicable;

Include Rainflow Counting - enables rainflow counting methodology for variable amplitude loading. This option allows for more sophisticated fatigue analysis considering the actual loading history rather than constant amplitude assumptions;

Assessment Categories

Weld Stress - specifies that the fatigue assessment will be performed on weld stresses, using appropriate SN curves and detail categories for welded connections;

Half Cycles defines the counting method for stress cycles. Half cycles method counts each stress reversal as a half cycle, which is then combined to determine the total number of stress cycles for fatigue damage calculation.

Standard uses material data (Yield/Tensile) in calculations. Wizard checks if the values are defined for all materials.