weac.core.slab module¶

This module defines the Slab class, which represents the snow slab and its properties.

class weac.core.slab.Slab(layers)[source]¶

Bases: object

Parameters of all layers assembled into a slab, provided as np.ndarray for easier access.

Coordinate frame: - z-axis points downward (first index: top layer, last index: bottom layer) - z = 0 is set at the mid-point of the slab’s thickness

Parameters:: layers (List[Layer])

zi_mid¶

z-coordinate of the layer i mid-point

Type:: np.ndarray

zi_bottom¶

z-coordinate of the layer i (boundary towards bottom)

Type:: np.ndarray

rhoi¶

densities of the layer i [t/mm^3]

Type:: np.ndarray

hi¶

thickness of the layer i [mm]

Type:: np.ndarray

Ei¶

Young’s modulus of the layer i [MPa]

Type:: np.ndarray

Gi¶

Shear Modulus of the layer i [MPa]

Type:: np.ndarray

nui¶

Poisson Ratio of the layer i [-]

Type:: np.ndarray

H¶

Total slab thickness (i.e. assembled layers) [mm]

Type:: float

z_cog¶

z-coordinate of Center of Gravity [mm]

Type:: float

qw¶

Weight Load of the slab [N/mm]

Type:: float

rhoi: ndarray¶

hi: ndarray¶

Ei: ndarray¶

Gi: ndarray¶

nui: ndarray¶

z0: float¶

zi_mid: ndarray¶

zi_bottom: ndarray¶

H: float¶

z_cog: float¶

qw: float¶

__init__(layers)[source]¶

Parameters:: layers (List[Layer])
Return type:: None

layers: List[Layer]¶

calc_vertical_center_of_gravity(phi)[source]¶

Vertical PSTs use triangular slabs (with horizontal cuts on the slab ends) Calculate center of gravity of triangular slab segments for vertical PSTs.

Parameters:

phi (float) – Slope angle [deg]

Returns:

x_cog (float) – Horizontal coordinate of center of gravity [mm]
z_cog (float) – Vertical coordinate of center of gravity [mm]
w (float) – Weight of the slab segment that is cut off or added [t]