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Important Note – These are descriptions to changes implemented in WoodWorks Shearwalls for version 9 and may not reflect current behavior.
A new page has been added to the Settings input for hold-down data that apply to all hold-down locations in the structure.
Each of the input controls within this settings page has context-sensitive help, explaining its purpose and use. If you click on the question mark in the upper left hand corner of the view, then on the input control a small yellow box appears with the description of the item.
The following are brief descriptions of the input fields within the box; for more details, use the context-sensitive help in the program.
A new group box is added to include options affect the generation of hold-down forces from shearline forces on segments.
This has been moved to this page from the Default Values page. In addition, the following capability is added:
If a value is entered that is greater than or equal to ½ a shearwall segment length, the program reverts to the factory default value of 1.5” for that segment. It issues no warning in this case, it is evident only by the placement of the hold-down in elevation view and its position as listed in the Hold-down Design table.
A checkbox indicates whether the program subtracts the hold-down offset from the wall length when calculating the overturning moment arm. AWC SDPWS 4.3.6.1.1 (Eqn. 4.3-4) indicates that this distance is not subtracted, however engineering mechanics, particularly when there is only one shearwall on a line, require that it be subtracted.
The default value is to subtract the offset. For project files from previous versions, the offset is not subtracted, so as not to affect existing design results.
A checkbox iindicates whether the program includes the floor depth above the wall in the wall height h when calculating the overturning moment arm. AWC SDPWS 4.3.6. Eqn. 4.3-4,5 indicates that this distance is not included, however this creates gaps in the static analysis of multi-level structures.
The default value is not to add the joist depth subtract the offset. For project files from previous versions, the offset is not subtracted.
The inputs in this data group allow you to replace the vertical hold-down displacement components from with constant values for all hold-downs in the program. They also allow you to specify values for these components if they cannot be calculated or are not available from the hold-down database for a particular hold-down. A warning appears in the output if this situation occurs.
If box is checked, the program uses the input value as the elongation for all hold-downs in the structure that have separate elongation/slippage, overriding the hold-down database value. If box is not checked, it uses the override value only when a value is not available from the database for the stud size that the hold-down is attached to.
If box is checked, the program uses the input value as the elongation for all hold-downs in the structure that have combined elongation/slippage, overriding the hold-down database value. If box is not checked, it uses the override value only when a value is not available from the database for the stud size that the hold-down is attached to
If box is checked, the program uses the input value as the wood shrinkage value for all hold-downs in the structure, overriding the value calculated using moisture content and length subject to shrinkage on each floor.
If box is checked, the program uses the input value as the nail slippage for all nailed hold-downs in the structure that have separate elongation/slippage, overriding the hold-down database value. If box is not checked, it uses the input value only when the force Vn on each nail is greater than the maximum allowed in SDPWS Table C4.2.2D.
Data for hold-down displacement calculations that cannot be entered independently at each hold-down location is entered here.
Used to enter the proportion of the floor depth as input in the Structure input view, plus the depth of other wood members such as wall top and bottom plates that is subject to shrinkage. These values can be adjusted for individual floors in Structure Input view, they are of primary use in creating defaults for new files for these values.
The deformation of the bottom wall plate beneath the end chord studs at the compression end of the shearwall. The “factory” default is 0.04 corresponding to lumber loaded to capacity for perpendicular compression according to NDS 4.2.6. A value of 0.02 corresponds to lumber loaded to 73% capacity.
Additional sources of vertical shearwall displacement are input here at the discretion of the designer. This could include allowance for studs that are cut too short or without square-cut ends
The difference between drilled hole diameter in the studs and the diameter of the horizontal bolt shank. For Assembly displacements that include slippage (see 1b, above), any value greater than 1/16” is added to the published displacement, which includes the effect of standard size bolt holes. For separate slippage and elongation, the entire value is added to the calculated slippage.