Unless your staircase is part of the overall lateral force resisting system of the building it would probably be more appropriate to consider it a non-structural components and use ASCE 7 Chapter 13 for your seismic design forces (i.e. Fp forces).
Thomas Hunt, S.E.
Fluor
From: Padmanabhan Rajendran <prajendran@ymail.com>
To: seaint@seaint.org
Date: 11/29/2010 08:13 AM
Subject: Seismic design of staircase in California
| I am designing a steel staircase located in South Long Beach, California. It is about 22' tall laid at about 40 deg to horizontal. To estimate seismic loads on the structure, I am considering it as a non-building structure subject to the sections of Chapter 15 of ASCE 7 (2005 edtition). There are 2 tables in this chapter to determine "R" and "Omega 0": Table 15.4-1 for nonbuilding structures similar to buildings and Table 15.4-2 for nonbuilding structures not similar to buildings. I think the staircase would be classified under Table 15.4-2 as "All other self-suppoting structures, tanks or vessels not covered above or by reference standards that are similar to buildings". Under this classification R = 1.25 and Omega0=2. Is my assumption correct? If not, what will be the accepted method? Thanks. Rajendran |
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