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ECL1PSE <br /> ENGINEERING <br /> Project:Amazon DWS4 <br /> Stair <br /> Tread ConnectionProject#: 21-10-166 <br /> Date: 10120/2021 <br /> Engineer: BA <br /> Page: 1 of 1 <br /> Tread Information The treads shall be analyzed for the worst case load scenario of either a <br /> Depth= 11.875 in 300#concentrated load centered on the tread,or a 100 psf uniform load. <br /> Thickness= 0.0785 in <br /> Stair Width= 36 in <br /> P= 300.00 Ibs <br /> '4- <br /> .cor- <br /> DL+LL= 140 psf <br /> as' <br /> W= 138.54 Ib/ft ¢Q - <br /> 4" '4-a-Q� <br /> Fy= 40 ksi 4_¢.a•-4-•• <br /> E= 29000 ksi ¢�g <br /> I= 0.229 in4 <br /> S= 0.183 in3 STAIR TREAD <br /> ob= 1.67 <br /> Mn= 7.32 k*in Mn = F3,5 <br /> Mn/Ob = 4.4 kin <br /> AA(L1360)= 0.1000 in <br /> Uniform Load Point Load <br /> MR = 1.9 kin. 2.7 kin. <br /> I MR/Mc 0.43 S 1 Bending OK 0.62 <_1 Bending OK I <br /> AR 0.0380 in. 0.0439 in. <br /> I AR/AA 0.38 <_1 Deflection OK 0.44 <_1 Deflection OK I <br /> = Mn _ WL2 _ 5WL4 _ PL _ PL3 <br /> Mc �b MR 8 AR 384E/ MR 4 AR 48E/ <br /> Bolted Connection i2=2 <br /> Bolts: 318"-A307 Bolt Capacity(per Bolt) <br /> No.Bolts= 2 per Tread Shear Capacity Bearing Capacity <br /> Fu= 58 ksi Rn: 2.65 k 4.0977 k <br /> tmin= 0.0785 in Pt,/0: 1.33 k 2.04885 k <br /> L0= 1in IRr/Rc: 0.16 51--OK 0.10 51--OK I <br /> db= 0.375 in Rn = 1.2L,tFu <br /> R = F A <br /> Ab= 0.1104 in2 n nv b Rn < 2.4dbtFu <br /> Fn,= 24.0 ksi <br /> Rr(Bolt)= 0.21 k <br /> 11/20 <br />