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The program implements provisions from the following design codes and standards:
The International Building Code (IBC 2018) references the 2015 SDPWS for all design procedures, except those using staples, which are not permitted by SDPWS. Shearwalls does not include staples, so there are no differences between SDPWS and IBC in the program's design procedures.
The National Design Specification (NDS 2018) 1.1.1.4 references SDPWS 2015 for all shear wall and diaphragm provisions, and the NDS is referenced by the 2015 IBC. The NDS is used directly for nail withdrawal calculations.
Most of the topics in this section contain comprehensive tables containing the specific design code provisions implemented in Shearwalls and the references to them in the design standard documents.
Interpretation of Available Design Values
The sheathing thicknesses used in the program reflect standard manufactured sizes appearing in the applicable SDPWS tables. For other sizes, these thicknesses should be regarded as minimum values. For example although a thickness of 1/2 inch does not appear in the WFCM table, you would use the next smaller available thickness, in this case 15/32 inches.
To ensure that the design value is truly conservative for the larger thickness, however, the designer should verify the applicability of the other design parameters. Substituting a thicker sheathing does not necessarily increase the capacity of a shear wall unless an appropriate nail length, size and type are used.
Similarly, nail sizes listed in the tables are assumed to be minimum sizes and do not preclude the use of larger nails, although no corresponding increase in shear capacity is realized.
Shearwalls specifies only common nails, so that the equivalent fastener must be determined when substituting other nail types (e.g. power nails) for common nails.