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Seismic Main Floor - Roof(per ASCE 7-10, 12.8) LRFD <br /> Basic Parameters <br /> • Equivalent Lateral Force Procedure(ELFP) <br /> • Site class: D <br /> • Seismic design category: D <br /> • Light Framed Wood Walls Sheathed w/Wood Panels <br /> 1s:= 1.0 Seismic importance factor(ref.table 1.5-2) <br /> SDS:= 0.963 Design spectral acceleration parameter(ref.ATC summary report) <br /> R:= 6.5 Response modification factor-(ref.table 12.2-1) <br /> S20 := 2.5 System overstrength factor(ref.table 12.2-1) <br /> Cd := 3.25 Deflection amp.factor(ref.table 12.2-1) <br /> p:= 1.0 Redundancy factor(ref section 12.3.4) <br /> Cs SDS =0.15 Seismic response coefficient <br /> • R <br /> 1s/ <br /> SD1 := 0.552 Si := 0.552 <0.6g therefore 12.8-6 does not apply <br /> Highest level of structure hwall =9 ft Wal height hn := hrf = 18 ft <br /> Ct:= 0.02 x:= 0.75 Table 12.8-2 <br /> /h �x <br /> Ta:= Ct• — =0.17 EQ 12.8-7 <br /> ft i <br /> SD1 <br /> • R� Csmax=0.49 <br /> Csmax <br /> Ta• — <br /> \ls/ <br /> Cs:= max(min(Cs,Csmax),0.01) Cs = 0.148 <br /> 0.5•SD1 <br /> R <br /> Cs min =0.04 EQ 12.8-6 <br /> lsi <br /> Cs wood := p•Cs Cs wood =0.148 <br /> 02_Lateral Analysis.xmcd Q.6/ / <br /> S9 <br />