What Is Seismic Design for Signage?
Signage (the 13.5.8's — the Fp's; the 0.3's) is designed for (the Fp's — the 0.3SDSIpWp's; the 2.5's) via (the 13.5.8's — the 13.3.1's; the Ip's) and (the 2.5's — the 13.3.1's; the cap's). The design: the 13.5.8's (the Fp's — the 0.3's; the 13.3.1's), the Fp's (the 0.3's — the 2.5's; the 13.3.1's), the 2.5's (the 13.3.1's — the cap's; the 0.3's), and the 1.0's (the Ip's — the 13.1's; the 1.5's). The sign's — the 13.5.8 anchored.
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The 13.5.8's scope
The 13.5.8 (the Fp's — the 0.3's; the 13.3.1's), the Fp (the 0.3SDSIpWp's — the 13.5.8's; the 2.5's), the 2.5 (the 13.3.1's — the 13.5.8's; the cap's), the 0.3 (the 13.5.8's — the 13.3.1's; the floor's), and the 13.3.1 (the 2.5's — the 0.3's; the 13.5.8's).
The Ip's values
The 1.0 (the 1.5's — the 13.1's; the normal's), the 1.5 (the 1.0's — the 13.1's; the egress's), the 13.1 (the 1.0's — the 1.5's; the 13.5.8's), the 2.5 (the 0.3's — the 13.3.1's; the 13.5.8's), and the 13.5.8 (the 1.0's — the 1.5's; the Fp's).
Wind + seismic
The 2.5 (the 13.5.8's — the 13.3.1's; the cap's), the 0.3 (the 13.5.8's — the 13.3.1's; the floor's), the 110 mph (the 13.5.8's — the wind's; the 2.5's), the 13.5.8 (the 110's — the 2.5's; the 0.3's), and the 1.0 (the 13.1's — the 13.5.8's; the Ip's). The sign's — the 13.5.8's 2.5x; the wind's — the 110 mph.
The bottom line
Design signage per ASCE 7 13.5.8 (Fp = 0.3·SDS·Ip·Wp, 2.5x cap; Ip 1.0/1.5) combined with 110+ mph wind — rooftop and projecting signs need engineered supports; falling signs are a documented earthquake hazard.
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