EN 1991-1-3 NA Snow loads family

 

The EN 1991-1-3 NA Snow loads family is created when the Eurocodes 1 (EC1) - Germany climatic standard is selected for the current project.

EN 1991-1-3 NA Snow loads family - Properties

Family

• Name: the default name of the family.

• No.: displays the ID number of the family.

Snow category

• Category: allows the selection of the snow region type. When selecting user-defined, is possible to define custom values for the combination coefficients.

Combinations

Define properties that are taken into account when generating concomitance combinations. See Configuring load cases combinations.

• Group loads: when enabled, each load case inherits "combinations" properties from the corresponding load case family and will be grouped as a generic load case in the concomitance matrix.

• Effect: sets the load case as "Leading", "Accompanying" or both.

• Coefficient γ EQU: partial factor for seismic action considered in the EQU ultimate limit state

• Coefficient γ STR/GEO: partial factor for seismic action considered in the STR/GEO ultimate limit state

• Ψ0 coefficient: factor that defines the combination value of a variable action

• Ψ1 coefficient: factor that defines the frequent value of a variable action

• Ψ2 coefficient: factor that defines the quasi-permanent value of a variable action

Situation of the project

• Exceptional snow accumulation: enables/disables the snow accumulation option.

• Exceptional snow fall: enables/disables the exceptional snow fall.

Parameters

• Typical value: defines the snow region. Each region is defined by certain snow loads values. To set custom values for the snow loads, select Other.

• The button displays the snow regions map and allows the selection of the corresponding region.

Regions for EN 1991-1-3 NA snow loads family

• Snow load: automatically calculated according to the selected region. A custom value (in kN/m2) can also be set.

• Exceptional snow load: automatically calculated according to the selected region. A custom value (in kN/m2) can also be set.

• Exposure factor: allows the selection of the location type: swept by the winds, normal or protected.

• Thermal factor: the thermal coefficient (Ct) varies in special cases (when the roofs have high thermal transmittance ( > 1 W/ m2 K ), in particular for some glass covered roofs, because of melting caused by heat loss). In all other cases, Ct = 1.00.

• Altitude: allows the definition of the location altitude.

Color

• View / change the representative color for the family.

 

Tip

Click a section of the properties window. Notice the bottom area of the window; it displays a short description of the active cell's content.

 

Accessing the properties

After creating a snow load case family: in the Project Browser, expand the Loading group and select Snow EN 1991-1-3 NA.