Table 10-1: Architectural Components Coefficients
Ap a
Rp b
Architectural Component or Element
Interior Nonstructural Walls and Partitions (See also Section 6.2.8 of FEMA 302)
Plain (unreinforced) masonry walls
1.0
1.25
All other walls and partitions
1.0
2.5
Cantilever Elements (unbraced or braced to structural frame below its center of mass)
Parapets and cantilever interior nonstructural walls
2.5
2.5
Chimneys and stacks where laterally supported by structures
2.5
2.5
Cantilever Elements (Braced to structural frame above its center of mass)
Parapets
1.0
2.5
Chimneys and stacks
1.0
2.5
c
Exterior nonstructural walls
1.0
2.5
Exterior Nonstructural Wall Elements and Connections (see also Section 6.2.4 of FEMA 302)
Wall element
1.0
2.5
Body of wall panel connections
1.0
2.5
Fasteners of the connecting system
1.25
1
Veneer
High deformability elements and attachments
1.0
2.5
Low deformability elements and attachments
1.0
1.25
Penthouses (except when framed by an extension of the building frame)
2.5
3.5
Ceilings (see also Section 6.2.6 of FEMA 302)
All
1.0
2.5
Cabinets
Storage cabinets and laboratory equipment
1.0
2.5
Access floors (see also Section 6.2.7 of FEMA 302)
Special access floors (designed in accordance with Section 6.2.7.2 of FEMA 302)
1.0
2.5
All other
1.0
1.25
Appendages and Ornamentation
2.5
2.5
Signs and Billboards
2.5
2.5
Other Rigid Components
High deformability elements and attachments
1.0
3.5
Limited deformability elements and attachments
1.0
2.5
Low deformability elements and attachments
1.0
1.25
Other flexible components
High deformability elements and attachments
2.5
3.5
Limited deformability elements and attachments
2.5
2.5
Low deformability elements and attachments
2.5
1.25
a
A lower value for ap may be justified by detailed dynamic analysis. The value for ap shall not be less than 1.00. The value of ap = 1 is for
equipment generally regarded as rigid and rigidly attached. The value of ap = 2.5 is for flexible components or flexibly attached
components. See Chapter 2 of FEMA 302 for definitions of rigid components and flexible components, including attachments.
Rp= 1.25 for anchorage design when component anchorage is provided by expansion anchor bolts, shallow chemical anchors, or shallow
b
(nonductile) cast-in-place anchors, or when the component is constructed of nonductile materials. Powder-actuated fasteners (shot pins)
shall not be used for component anchorage in tension applications in Seismic Design Categories D, E, or F. Shallow anchors are those
with an embedment length-to-diameter ratio of less than 8.
c
Where flexible diaphragms provide lateral support for walls and partitions, the design forces for anchorage to the diaphragm shall be as
specified in Section 5.2.5.4.4 of FEMA 302.
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