To define the different load cases, first select the desired load case from the pull-down list at the top of the load icon field:
Here you can choose between a number of predefined load groups:
- selfweight: calculated automatically based on the dimensions of the bars in the calculation model.
- dead load: here you define the loads that permanently affect the structure. Examples include the weight of floor slabs, screed, tiles, roofing materials, etc. The loads you define within this load group do not necessarily act together on the entire structure. However, 1•2•Build will actively search for all possible combinations of loaded and unloaded fields in order to take into account the variable nature of this load.
- live load: the loads resulting from normal use of the structure, which are derived from the applicable standards depending on the purpose of the building (residential, public, archive space, etc.).
- snow1 and snow2: snow loads on, for example, a roof structure. Providing two load groups allows for the consideration of “scenarios” in which both sides of a gable roof with a significant slope are loaded unevenly. Within each snow load group, all loads act together on the structure, but 1•2•Build always assumes that the loads defined under snow1 and snow2 cannot occur together.
- wind1, wind2, wind3 and wind4: wind loads on a structure. Providing 4 load groups allows a distinction to be made between various load scenarios, for example depending on the wind direction (left → right or right → left). Within each wind load group, all loads act together on the structure, but 1•2•Build always assumes that the loads defined under wind1, wind2, wind3 and wind4 cannot occur together.
1•2•Build keeps track of which load groups you have actually included load data for and will then automatically combine those load groups according to the Eurocode regulations, taking into account the appropriate safety coefficients γ and combination factors Ψ. The safety coefficients γ and combination factors Ψ can be determined unambiguously based on the name of the load group and the selected standard.
The more load cases you define, the more combinations 1•2•Build will automatically create and the more computing time the calculation will require.
