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DEI PROJECT NAME WILDREED APTS - DECK REPAIRS SHEET# <br /> DIBBLE ENGINEERS INC PROJECT4 DATE <br /> www.dibbleengineers.com 23-107 <br /> 1029 Market Street,Kirkland,WA 98033 SUBJECT By <br /> 425.828.4200 SEISMIC BASE SHEAR <br /> LATERAL NARRATIVE: <br /> THE EXISTING DECKS ARE CURRENTLY TIED TO THE EXISTING BUILDING THROUGH LEDGER <br /> CONNECTIONS TO THE RIM BOARD. <br /> THE LATERAL SCOPE OF THIS PROJECT IS LIMITED TO THE RE-CONNECTION OF THE DECK TO <br /> THE BUILDING AT REPAIR LOCATIONS. THE PROPOSED REPAIR WORK IS IN KIND <br /> REPLACEMENTS AND WILL NOT INCREASE THE LATERAL FORCES TO THE EXISTING BUILDING. <br /> EQUIVALENT LATERAL FORCE PROCEDURE (ASCE 7-16 SECTION 12.8): <br /> W= 15 PSF (87.5 SF) = 1,313 LBS <br /> TABLE 12.2-1: <br /> R= 6.5 [A.15: BEARING WALL SYSTEM WITH LIGHT FRAMED WOOD SHEAR WALLS] <br /> Eq. 12.8-2: <br /> Cs = SDS / (R/ le) <br /> = 1.094/ (6.5/ 1.0) <br /> = 0.17 <br /> Eq. 12.8-5: <br /> Cs (MIN) = 0.044(SDS)(Ie) >_ 0.01 <br /> = 0.044(1.094)(1.0) <br /> = 0.05 < Cs .'. USE Cs FROM Eq. 12.8-2 <br /> Eq. 12.8-1: <br /> V = (Cs)(W) <br /> V (ULT) = 0.17 (1,313 LBS) = 223 LBS <br /> V (ASD) = 0.7 (223 LBS) = 156 LBS <br />