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In the Shearwalls wind load generation process, pressures are generated on any or all building surfaces using either the Directional procedure or the Envelope procedure, and the Site information you have entered, also applying Minimum Loads. The wind pressures acting on walls and roof surfaces are then converted to Main Wind Force Resisting System (MWFRS) line loads acting on each diaphragm, and Components and Cladding (C&C) loads on the faces of each building block. Refer to Load Generation Assumptions for more information about our interpretation of the wind loading provisions.
You can choose which surfaces and building levels to load using Load Generation Options; typically loads are generated for the entire structure at once.
In general, MWFRS loads have the same profile as the building elements that are used to generate them. Uniform line loads are generated for walls and for side panels with gable end construction. Two triangular loads are generated for hip and gable ends. As many as three triangular or uniform loads are generated for roof side panels, depending on the end construction.
The roof diaphragm or upper level ceiling diaphragm is considered to resist or support the wind acting on the roof surfaces, gable end walls, half the height of the top-level walls, and the thickness of the upper level ceiling. Each floor diaphragm is considered to support wind acting on half the height of the walls above and half the height of the walls below the diaphragm and the thickness of the diaphragm itself. The bottom half of the first story walls is not included in any loads. Refer to Building Model Assumptions for more information.