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Program:

Jazyk:

Buckling

These formulas are used for the calculation of relative slenderness ratios λ_rel,y and λ_rel,z

where is:	*λ_y* , *λ_z*	Slenderness ratios corresponding to bending about the y and z axis
	*k_c*	Instability factor, the lesser of k_c,y and k_c,z is considered
	*f_c,0,k*	Characteristic compressive strength along the grain

Slenderness ratios λ_y, λ_z are calculated using these formulas

where is:	*l_cr,y* , *l_cr,z*	Buckling lengths corresponding to bending about the y and z axis
	*i_y* , *i_z*	Radius of gyration corresponding to bending about the y and z axis

The instability factors k_c,y and k_c,z are calculated using following formulas

where is:	*λ_rel,y, λ_rel,z*	Relative slenderness ratios corresponding to bending about the y and z axis
	*k_y, k_z*	Instability factors calculated using following formulas

where is:	*λ_rel,y, λ_rel,z*	Relative slenderness ratios corresponding to bending about the y and z axis
	*β_c*	Straightness factor equal to 0.2 for solid timber and 0.1 for glued laminated timber

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