(Standard Eq. 13.3-1) = 1.6(1.0)(1.5)(706 lb) = 1,694 lb (Standard Eq. 13.3-2) Fpmax = 0.3(1.0)(1.5)(706 lb) = 318 lb (Standard Eq. 13.3-3) Fpmin Eq. 13.3-3 governs, and = 318 lb Fp = (Standard Eq. 12.4-3) Eh ρQE = 0.2SDSD (Standard Eq. 12.4-4a) Ev where: (due to horizontal application of = 318 lb (Standard Sec. 12.4.2.1) QE Fp) = 1.0 (because egress stairs are nonstructural components) (Standard Sec 13.3.1) ρ = dead load effect (due to vertical load application) D Substituting, the following is obtained: = = (1.0)( 318 lb) = 318 lb (horizontal earthquake effect) Eh ρQE = 0.2SDSD = 0.2SDSD = (0.2)(1.0)(318 lb) = 64 lb (vertical earthquake effect) Ev The above terms are then substituted into the following Basic Load Combinations for Strength Design from Section 12.4.2.3 to determine the design member forces to be used in conjunction with Standard seismic and gravity loads. 1.2D + + + + 0.2S (Standard Basic Load Combination 6) Ev Eh L 0.9D - + (Standard Basic Load Combination 7) Ev Eh 18.3.3.2 Landing. = = 513 lb (vertical gravity effect) D Wp
(Standard Eq. 13.3-1) Fpmax = 1.6(1.0)(1.5)(706 lb) = 1,694 lb (Standard Eq. 13.3-2) Fpmin = 0.3(1.0)(1.5)(706 lb) = 318 lb (Standard Eq. 13.3-3) Eq. 13.3-3 governs, and Fp = 318 lb Eh = ρQE (Standard Eq. 12.4-3) Ev = 0.2SDSD (Standard Eq. 12.4-4a) where: QE (due to horizontal application of Fp) = 318 lb (Standard Sec. 12.4.2.1) ρ = 1.0 (because egress stairs are nonstructural components) (Standard Sec 13.3.1) D = dead load effect (due to vertical load application) Substituting, the following is obtained: Eh = ρQE = (1.0)( 318 lb) = 318 lb (horizontal earthquake effect) Ev = 0.2SDSD = 0.2SDSD = (0.2)(1.0)(318 lb) = 64 lb (vertical earthquake effect) The above terms are then substituted into the following Basic Load Combinations for Strength Design from Standard Section 12.4.2.3 to determine the design member forces to be used in conjunction with seismic and gravity loads. 1.2D + Ev + Eh + L + 0.2S (Standard Basic Load Combination 6) 0.9D - Ev + Eh (Standard Basic Load Combination 7) 18.3.3.2 Landing. D = Wp = 513 lb (vertical gravity effect)
121715_DesignExamples_15-18.docx