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501A.3.3 Prescriptive Compliance Provisions for NPC 2, NPC 3, NPC 4 or NPC 4D and NPC 5
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Supports and attachments of nonstructural components, except those listed in Section 501A.3.3.2 below, in buildings in seismic performance categories SPC 1 or SPC 2 with a performance level of NPC 3 or higher, and SPC 3, SPC 4 or SPC-4D, shall be permitted to comply with the provisions of Section 1630B of the 1998 California Building Code using an importance factor Ip=1.5. The capacity of welds, anchors and fasteners shall be determined in accordance with requirements of the California Building Code for new construction.
Supports and attachments for systems listed under NPC-2 and NPC-5 (excluding those specifically listed for NPC-3 and NPC-4 or NPC-4D) in the California Administrative Code, Chapter 6, Table 11.1 shall satisfy the requirements of the California Building Code for new construction and Section 501A.3.3.1 above shall not be applicable.
For NPC 3 and NPC 4 or NPC 4D in SPC 2, SPC 3, SPC 4 or SPC-4D buildings, the adequacy and design of nonstructural component or equipment supports and attachments may extend only to the connection of the component or equipment to the support when the total reaction at the point of support (including the application of Fp) is less than or equal to the following limits:
- 250 pounds for components or equipment attached to light frame walls. For the purposes of this requirement, the sum of the absolute value of all reactions due to component loads on a single stud shall not exceed 250 pounds.
- 1,000 pounds for components or equipment attached to roofs, or walls of reinforced concrete or masonry construction.
2,000 pounds for components or equipment attached to floors or slabs-on-grade.
Exception: If the anchorage or bracing is configured in a manner that results in significant torsion on a supporting structural element, the effects of the nonstructural reaction force on the structural element shall be considered in the anchorage design.
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