What Is Seismic Design for Suspended Ceilings?
Suspended ceilings (the ASTM C636's — the installed; the E580's — the seismic) are designed for (the Fp — the component's; the SDC's) via (the wires' — the splayed; the compression's — the struts). The design: the E580 (the CISCA's — the standard), the categories (the D0/D1/D2's — the SDC's), and the perimeter (the 2-inch — the molding's; the D2's). The earthquake's — the ceiling's retained.
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The seismic categories
The D0 (the SDC A's — the none; the standard), the D1 (the SDC B-C's — the 12 sq ft's; the splayed's), the D2 (the SDC D-F's — the 144 sq ft's; the compression's; the 2-inch's — the perimeter's), and the 2,500 (the sq ft's — the 5,000's; the seismic's — the separation joints').
Design per E580
The wires (the splayed — the 4x90°; the D1's), the struts (the compression's — the 12-foot o.c.; the D2's), the perimeter (the 2-inch — the molding's; the D2's; the 3/4's — the D1's), the tiles (the clipped — the 144 sq ft's; the D2's), and the separation (the 2,500's — the joints'; the 50-foot's).
MEP integration
The fixtures' (the independently — the supported; the 2 wires'), the diffusers' (the positively — the attached; the 2 wires'), the pendant (the braced — the 4-foot's; the D2's), and the sprinklers' (the flexible — the drops'; the 13's). The ceiling's — the component's chapter; the E580's design.
The bottom line
Design suspended ceilings per ASTM E580/C636 by SDC (D1: splayed wires; D2: compression struts at 12-ft o.c., 2-in perimeter, clipped tiles in 144 sq ft modules) — independently support MEP.
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