|
|
|
|
|
When this setting is selected, all inputs in the Wall Input View pertaining to material construction are applied to all walls on the shear line i.e. the program forces all walls on the line to be of identical construction.
Prior to Shearwalls 11, the program always required identical materials along a shear line, but a clarification in SDPWS 2015 Commentary C4.3.3.4 of "same materials and construction" interprets it to mean that classes of materials such as wood structural panels, gypsum wallboard, fiberboard must be the same, but details such as the sheathing thickness and nailing patterns do not have to be identical.
Although no longer required by SDPWS, forcing these materials to be identical has advantages in terms of processing time and generating practical designs.
When different material details are allowed, the program designs each wall for unknown parameters separately, but if they must be the same, it designs only for the critical segment on the shear line.
For capacity-based distribution, the distribution of forces to non-identical shear walls can change once walls are fully specified, so the program must perform repeated iterations of wall design to stabilize the distribution of shear forces on the wall segments. For deflection-based distribution, iterative design is required regardless of whether identical materials are used, but specifying different materials can lead to more iterations being required.
By default, this setting is unchecked, that is, non-identical materials along a line are allowed, but the program still forces the Material input for all walls on the line to be of the same class of materials, to comply with SDPWS 4.3.3.4. These material classes are Gypsum-based (GWB, Gypsum sheathing, Plaster and lath), Wood structural panels (Structural sheathing, Structural 1, Plywood siding), Lumber sheathing, and Fiberboard.
When this setting is checked, all walls on the line are necessarily of the same wall design group, but if non-identical materials are allowed, there can be different groups on the same line. The same groups may be on other lines in the building, so a change in material type can propagate through the structure, leading to unexpected changes to other shear lines .