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Structural calculations: <br />CITY OF SANTA ANA <br />Planning and Building Agency <br />may, lS. <br />Approved <br />FOR PERMIT ISSUANCE <br />The following conditions were analyzed: <br />a) Existing Balcony Joist with less than 2" decay at top. —Sister anew membe <br />allow adequate nailing of plywood decking. <br />w = 75 psf * 2' trib = 150 plf <br />a=4' <br />M_max = (w*a^2)/2 = (150*4^2)/2 = 1200 ft*# <br />V max = w*a = 150*4 = 600 # <br />>>2x10isO.K. <br />b) Existing Balcony joist with more than 2" decay —where joist is cutback to wall and a <br />headout is installed and the 3 x 10 ledger carries the weight to the adjacent cantilever joists. <br />(Factor all values by 16"/24") <br />M_max = (w*a^2)/2 <br />M max = 800 ft*# <br />V max = w*a <br />V max = 400 # <br />>> 2x8 is O.K. <br />c) 3 x 10 ledger spaning 32" where joist is cut out. <br />w = 75 psf * 2' trib = 150 plf <br />a = 2.6' <br />M_max = (w*a^2)/8 = (150*2.6^2)/8 = 126.75 ft*# <br />V max = w*a = 150*2.6 = 390 # <br />>> 2x10 is O.K. <br />d) 2 x 2's @ 5" o.c. supporting railing lateral load. <br />M max = 300/12 Win * 5.5" * 42" = 5775#*in <br />T = M_max / (spacing between T&B screws) <br />= 5775/8" = 721 # <br />>> Assuming tension engages at least (2) screws in withdrawal, consider Simpson <br />SWWS22500 or equivalent (see page 4) <br />