What Is Seismic Design for Parapets and Ornaments?
Parapets and ornaments (the ASCE 7 Chapter 13 — the components') are designed for (the Fp — the 0.3SDSIpWp; the anchorage — the out-of-plane) — the falling's (the hazard's — the historic; the unreinforced's). The design: the bracing (the through-bolted — the anchored), the retrofit (the URM's — the mandated; the ordinances'), and the inspection (the special's — the anchorage's). The earthquake's — the falling prevented.
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The hazard
The falling (the parapets' — the sidewalks'; the URM's — the killer), the ornaments (the cornices' — the detached; the historic's), the chimneys (the unreinforced's — the collapsed; the metal's — the braced), and the appendages (the signs' — the marquees'; the anchored).
Design per Chapter 13
The Fp (the 0.3SDSIpWp — the component's; the Ip's — the 1.0/1.5), the anchorage (the through-bolted — the parapet's; the 4x — the height's), the bracing (the steel's — the angles'; the designed), and the concrete (the ACI 318's — the Chapter 17's; the post-installed's).
Retrofit and ordinances
The URM (the ordinances' — the mandated; the LA's — the 1981's), the bracing (the parapet's — the retrofitted; the FEMA P-774's), the chimneys' (the rebuilt — the metal's; the braced), and the maintenance (the inspected — the deteriorated; the repointed). The parapet is the public's — the bracing is the law's.
The bottom line
Design parapets/ornaments per ASCE 7 Ch. 13 (Fp = 0.3SDSIpWp, through-bolted bracing) — retrofit URM parapets per FEMA P-774; comply with local mandatory bracing ordinances.
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