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