Section properties

Material properties

E_mod	Modulus of elasticity in tension or compression (Young's modulus)	N/mm²
Poisson	Poisson's ratio (ν) is a measure of the Poisson effect, the deformation (expansion or contraction) of a material in directions perpendicular to the specific direction of loading	Unitless
G	Shear modulus or modulus of rigidity as G = E_mod / (2 · (1+Poisson))	N/mm²
Rho	Density or the volumetric mass density or specific mass of material (ρ)	kN/m³
LinExp	Coefficient of linear thermal expansion	C°m

Section properties

General properties
Area	Cross-sectional area (A) of mono-material cross section	mm²
n · Area	Cross-sectional area (n · A) of multi-material cross section	mm²
l_yz	Product of inertia. Product of inertia is a feature of a cross section that describes an imbalance relative to a defined set of coordinate axes. Product of inertia is equal to zero for the axis symmetrical cross section	mm⁴
Q_y, Q_z, Q_u, Q_v	Maximal first moment of area with respect to the global and principal axis of the cross section. Calculation of the Additional-advanced property may be restricted by technical module	mm³
p	External perimeter of a cross section	mm
p_int	Inner perimeter of a cross section, i.e. perimeter of the holes of the hollow core cross section	mm
g	Weight per length unit of the cross section bar	N/mm
EA	Axial stiffness as the ratio of the axial load to axial deflection	N
Y_cg, Z_cg, U_cg, V_cg	Coordinate of the axis system origin point is placed in the center of gravity of the cross section. Coordinate is calculated from the left bottom corner of the cross section	mm
Y+, Y-, Z+, Z-, U+, U-, V+, V-	Core distances from the neutral axis system origin point defined in the global (Y-Z) or principal (U-V) axis system to the most top (-), bottom (+), left (-) or right (+) corner of the cross-section core. Axial loading is placed on the section core, doesn’t affect appearance of the bending actions	mm

Flexural (bending) properties
Y_ac, Z_ac, U_ac, V_ac	Coordinate of the neutral axis system origin point. Coordinate is calculated from the left bottom corner of the cross section	mm
I_y, I_z, I_u,I_v	Second moment of area with respect to the global and principal axis of the cross section	mm⁴
r_yy, r_zz, r_uu, r_vv	Radius of gyration with respect to the global and principal axis of the cross section. Radius of gyration is valuable in calculating buckling load of a beam/column under compression	mm
e_y+, e_y-, e_z+, e_z-, e_u+, e_u-, e_v+, e_v-	Distances from the neutral axis system origin point in the global (Y-Z) or principal (U-V) axis system to the most top (-), bottom(+), left(-) or right (+) corner of the cross section	mm
W_y+, W_y-, W_z+, W_z-, W_u+, W_u-, W_v+, W_v-	Elastic section modulus with respect to neutral axis in the global (Y-Z) or principal (U-V) axis system for the most top (-), bottom(+), left(-) or right (+) corner of the cross section	mm³
EI_yy, EI_zz, EI_uu, EI_vv	Bending stiffness as the resistance of a member against bending deformation with respect to the global and principal axis of the cross section	N·mm²
Alpha	Rotation angle of the principal axis system	deg
Y_cg, Z_cg, U_cg, V_cg	Coordinate of the axis system origin point is placed in the center of gravity of the cross section. Coordinate is calculated from the left bottom corner of the cross section	mm
QQ_y, QQ_z, QQ_u,QQ_v	Value of with respect to the global or principal axis of the cross section. Value is used for the M_cr calculation (prEN 1993-1-1#C.2.1). Calculation of the Additional-advanced property may be restricted by technical module	mm

Plastic properties
Y_pl, Z_pl, U_pl, V_pl	Distance to plastic neutral axis with respect to centroid based global (Y-Z) or principal (U-V) neutral axis	mm
W_y,pl, W_z,pl, W_u,pl, W_v,pl	Plastic section modulus	mm³

Shear properties
A_vy, A_vz	Shear area with respect to the global axis of the cross section. Shear area is represented for the mono-material cross section only. Calculation of the Additional-advanced property may be restricted by technical module	mm²
y_s, z_s	Shear center coordinate with respect to centroid of the cross section. Calculation of the Additional-advanced property may be restricted by technical module, takes more computer resources and is performed on press of "Additional" button	mm

Torsion properties
I_p	Polar moment of inertia	mm⁴
I_t	Torsional constant. Calculation of the Additional-advanced property may be restricted by technical module, takes more computer resources and is performed on press of "Additional" button	mm⁴
GI_p	Torsional stiffness	N·mm²
I_w	Warping section modulus with respect to shear center. Calculation of the Additional-advanced property may be restricted by technical module, takes more computer resources and is performed on press of "Additional" button	mm⁶

By using the multi-material cross section, some section properties are reduced to the single (base) material, based on specific reduction formulas: see Bi-material reduction.