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These loads are generated by the program or applied manually to building faces. Shear loads are input or generated as seismic loads (double-headed arrow in Plan View) or wind shear loads (single arrow).
For wind loads they represent the effect of wind pressure on the building face and are referred to as MWFRS (Main Wind Force Resisting System) loads to distinguish from out-of plane Component and Cladding loads and serviceability loads for story drift calculations. They are generated and can be input in both directions separately, as for example a monoslope roof creates different wind pressures in opposing directions.
For seismic loads they represent the effect of the building mass that exists from that face to the opposite face of the structure. The are generated and can be input in one direction only, however the effect of the loads can be different in opposing directions due to asymmetries in the structure.
Shear loads can be manually applied over the extent of wall lines or selected walls, but internally they are attached to the building face. These loads remain with the building face as the walls making up the face are moved and resized.
Shear loads applied to a building face can extend past the walls making up that face to model the effect of overhanging eaves, for example.
The shear loads showing on the screen are the sum of all shear loads of the same type at a particular location.
These loads are distributed to the lateral force resisting system as described in Shear Force Distribution.