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Project: BRT Station Retaining Walls <br /> Project Number: 3213OT <br /> Subject: Design Basis and Loading <br /> By: BD <br /> Date: 12-Dec-16 <br /> Design Basis: <br /> International Building Code (IBC) 2006 <br /> WSDOT Bridge Design Manual,June 2016(BDM)-for wall design spreadsheets <br /> Load Cases per IBC Section 1605.3 (ASD): <br /> D+ L+ H controls <br /> D+S+ H not used <br /> D+0.75L+0.75S+ H not used <br /> D+0.7E+ H controls <br /> (for stability checks 0.6D not used) <br /> Dead Load (D): <br /> Concrete 150 pcf <br /> Soil Backfill 125 pcf <br /> EPS Backfill 1.35 pcf (EPS22,ASTM D6817) <br /> Live Load (L): <br /> Pedestrian 100 psf (Assembly areas) <br /> Snow Load (S): <br /> Snow 20 psf (ASCE 7-10) <br /> Earthquake Load (E): <br /> As 0.43 g (Refer to attachment) <br /> For 0.7E case, design As= 0.301 g <br /> 0.75L+0.75S= 90 psf - D+L+H case controls <br /> IBC Retaining Wall Factors of Safety: <br /> Static overturning 1.5 <br /> Static sliding 1.5 <br /> Seismic overturning 1.1 <br /> Seismic sliding 1.1 <br /> i, <br />