Verification of axial resistance for built-up cross-sections
The resistance of the partial member in tension or in plain compression is calculated using the expression
or
Where is: | A |
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fy |
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γM0 |
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The bending resistance for bending moment My is calculated for the classes 1 and 2 according to the following formula:
The formula for the class 3:
The formula for the class 4:
Where is: | Wpl,y |
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Wy |
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Wy,eff |
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The bending moment Mz is recalculated into the increment of axial force in partial cross-section dN. The recalculation uses following expression
The formula for members with battens:
Where is: | h0 |
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A |
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Iz |
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The similar recalculation is used for the shear force Vy in the direction of the strong axis. The shear force will be transferred into bending moment Mz for partial cross-section. Following expression is used:
Where is: | l1 |
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The bending resistance of partial cross-section for bending moment Mz is calculated for the classes 1 and 2 according to the following formula:
The formula for the class 3:
The formula for the class 3:
Where is: | Wpl,z |
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Wz |
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Wz,eff |
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The verification of the combination of axial force and bending moments is done according to the rules similar to the verification of solid cross-sections. This expression is used:
Where is: | n |
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dN |
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Mz,Sd |
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