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Eclipse Engineering, Inc. Consulting Engineers OMD Anderson Solar Salem, Oregon 7/2/2019 RVC Base Shear Calculations - New & Existing:plf lb ft 1-:= Design Criteria: psf lb ft 2-:= psi lb in 2-:=Seismic Loads: Roof DL - DLr 21.7 psf:= Wall DL - DLw 30 psf:=Conservative - Actual is CMU Solar DL - DLs 3.25 psf:= CHECK WIND LOADING - Note: The addition of flat solar panels to the roof does not increase the projected wind surface area. Therefore, wind load does not increase the total base shear on the existing structure. CHECK SEISMIC LOADING - Assume each diaphragm is isolated to the location of the array Existing Roof Projected Area - (Diaphragm at Panel Location) Ar 7400 ft2:=Note, this areas is an assumed area of the tributary to lateral resisting wall lines and is likely conservative Existing Wall Area - Height - Hw 10 ft:= Perimeter - Lw 100 ft:=Aw 0.5 H wLw500ft2=:= Actual Length/Area does not vary from Existing to New; therefore, actual length/height has little impact on the overall percentage - we've conservatively assumed a limited length of wall New Solar Panel Area - As 2167 2165+( ) ft24332ft2=:=Single Array Group NOTE: The IBC/CBC, Ch. 34 allows for a maximum load increase of 10% for lateral loads on an existing structure Solar Panel Dead Load -Ws DLs As14079lb=:= Existing Roof Dead Load - We DLr Ar160580lb=:= Existing Wall Dead Load - Ww DLw Aw15000lb=:= New Roof Dead Load - Wn Ws We+Ww+189659lb=:= Percent Increase in Dead Load Due to the Addition of Solar Panels: %inc Wn We Ww+( )- We Ww+( )100:=%inc 8=<< 10% OK THE ADDITION OF SOLAR PANELS DOES NOT RESULT IN AN INCREASE OF GREATER THAN 10% LATERAL LOAD ON THE EXISTING STRUCTURE DUE TO WIND OR SEISMIC FORCES AS ALLOWED BY THE IBC/CBC, Chapter 34. 8/12 20 114776 00 BP 3225 STATE STREET City of Salem Building & Safety Division 28/35