What Is Seismic Design for Stairs?
Stairs (the 13.5.10's — the Fp's; the 0.3's) are designed for (the Fp's — the 0.3SDSIpWp's; the 2.5's) via (the 13.5.10'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 13.5.10'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 1.5's (the Ip's — the 13.1's; the egress's). The stair's — the 13.5.10 connected.
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The 13.5.10's scope
The 13.5.10 (the Fp's — the 0.3's; the 13.3.1's), the Fp (the 0.3SDSIpWp's — the 13.5.10's; the 2.5's), the 2.5 (the 13.3.1's — the 13.5.10's; the cap's), the 0.3 (the 13.5.10's — the 13.3.1's; the floor's), and the 13.3.1 (the 2.5's — the 0.3's; the 13.5.10's).
The 1.5's Ip
The 1.5 (the 13.1's — the 13.5.10's; the egress's), the 13.1 (the 1.5's — the 13.5.10's; the 1.0's), the 1.0 (the 13.1's — the 13.5.10's; the normal's), the 2.5 (the 0.3's — the 13.3.1's; the 13.5.10's), and the 13.5.10 (the 1.5's — the 1.0's; the Fp's).
Drift accommodation
The 2-inch (the 13.5.10's — the drift's; the 2.5's), the drift (the 13.5.10's — the 2's; the 2.5's), the sliding (the 13.5.10's — the 2's; the connection's), the 2.5 (the 13.5.10's — the 13.3.1's; the 2's), and the 1.5 (the 13.1's — the 13.5.10's; the egress's). The stair's — the 13.5.10's 2-inch; the egress' — the 1.5 Ip.
The bottom line
Design stairs per ASCE 7 13.5.10 (Fp = 0.3·SDS·Ip·Wp, 2.5x cap; Ip 1.5 egress stairs) — sliding connections must accommodate full story drift (2 in+) without binding; stair damage traps occupants.
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