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• S 1 <br /> Langford Deck Replacement 2 <br /> Structural Calculations <br /> Check primary support beam: <br /> -Beam laterally braced by joists full length <br /> 'Joist <br /> wb '_ (wll+ wd1)• 2 = 187.5 Load to beam(Plf) <br /> 12•w l 2 <br /> M b' beam =72000 Max moment to beam(in-Ibs) <br /> b �= 8 <br /> CF:= 1.1 Size factor for 4x12 <br /> Mb <br /> Sreq = =72.727 Section modulus required (inA3) <br /> req • Fb CF <br /> 1beam'12 <br /> Ob :_ =0.533 Max allowed deflection (in) <br /> 360 <br /> 5 wb'lbeam4.1728 <br /> 1Teq :_ =324 MOI required for deflections(inA4) <br /> 384.E.Ob <br /> Use 4x12 primary support beam(S=73.83 in^3, I=415.3 inM) <br /> Use 2x8 PT ledger at house,anchor w/typ IRC pattern: <br /> 3/8"lag bolts @ 16"o.c.staggered. <br /> By:J. Conner, PE, SE Deck Structural Calcs.xmcd <br /> 12/5/2019 <br />