Laserfiche WebLink
GL B.4 TJL Collectors DCR (LS)DCR (LS) =0.93 (conservatively neglects compression from gravity loads) <br />GL B.4 TJL Collectors DCR (IO)DCR (IO) =0.87 (conservatively neglects compression from gravity loads) <br />Check Existing Collectors (4x6 Flat) on GL B & C <br />Collector Size Aw = 4x6 =19.25 in^2 <br />Tensile Strength (No. 1) Ft =800 psi (NDS Table 4A) <br />Format Conversion Factor Kf =2.7 <br />Resistance Factor Φ =1 <br />Size Factor Cf =1.3 <br />Other Factors Cm = Ct = Ci =1 <br />Adjusted Tensile Strength Ft' =2808 psi <br />Ft' =54054 lb <br />Wood Diaphragm M-Factors m, IO =1.5 <br />m, LS =3.0 <br />Nominal-to-Expected Strength F =1.5 <br />Total Strength (LS) Pn.ls = Ft'*m*F =243243 lb <br />Total Strength (IO) Pn.io = Ft'*m*F =121622 lb <br />GL 1.4 GL 2 GL 3 GL 3.5 <br />Existing Collector DCR (LS)0.39 N/A 0.30 N/A <br />Existing Collector DCR (IO)0.36 N/A 0.28 N/A <br />Check New 4x6 Collectors (4x6 Flat, Select Structural Grade) on GL 2 & 3.5 GL 1.4 GL 2 GL 3 GL 3.5 <br />Tensile Strength (No. 1) Ft =800 psi (NDS Table 4A) <br />Total Strength (LS)Pn.ls = 243243 lb <br />Total Strength (IO)Pn.io = 121622 lb <br />GL B.4 Collector DCR (LS)DCR = N/A 0.98 N/A 0.21 <br />GL B.4 Collector DCR (IO)DCR = N/A 0.92 N/A 0.19 <br />Check Existing Collector Splice Straps <br />Equation 7-35: J (LS) =2.0 (High Seismicity) <br />J (IO) =1.0 (High Seismicity) <br />X (LS or IO) =1.3 <br />C1C2 (LS) =1.4 <br />C1C2 (IO) =1.1 <br />X/(C1C2*J) (LS) =0.46 <br />X/(C1C2*J) (IO) =1.18 <br />GL 1.4 GL 2 GL 3 GL 3.5 <br />Existing Strap Demand (LS) Fs =43746 110807 34088 23431 lb <br />Existing Strap Demand (IO) Fs =52262 132377 40723 27992 lb <br />Existing Strap DCR (LS) DCR =8.24 N/A 6.42 N/A <br />Existing Strap DCR (IO) DCR =9.84 N/A 7.67 N/A <br />Check New Collector Splice Connections <br />Side Plates <br />New Plate Strength Fy =50 ksi <br />Expected Strength Fye = 62.5 ksi <br />Lower Bound Strength (85% of Expected per ASCE 41)Fylb = 53.125 ksi <br />GL 1.4 GL 2 GL 3 GL 3.5 <br />Steel Area Required Ea. Side As.min.LS = 0.41 1.04 0.32 0.22 in^2 <br />As.min.IO = 0.49 1.25 0.38 0.26 in^2 <br />Plate Width b.pl =3.0 in <br />Plate Minimum Thickness t.pl.min.LS = 0.137 0.348 0.107 0.074 in <br />t.pl.min.IO = 0.164 0.415 0.128 0.088 in <br />Plate Thickness t.pl =0.5 in <br />GL 1.4 GL 2 GL 3 GL 3.5 <br />Plate DCR DCR =0.27 0.70 0.21 0.15 <br />0.33 0.83 0.26 0.18 <br />Splice Thru-Bolts <br />Bolt Diameter db = 0.875 in <br />Double Shear Lateral Design Value Z = 4440 lb (Table 12G) <br />M-factors for metal to wood machine bolts M (LS) =2.8 <br />M (IO) =1.4 <br />Nominal-to-Expected Strength F =1.5 <br />Format Conversion Factor Kf =3.32 <br />Wet Service and Temperature Factors Cm = Ct =1.0 <br />Area of Side Plate As = 1.5 in^2 <br />Area of Main Member Am = 19.25 in^2 <br />Ratio Am/As = 12.8 <br />Group Action Factor Cg =0.88 (Table 11.3.6C for 7 bolts) <br />Bolt Edge Distance edge =1.75 in <br />8 of 100 <br />1327 S Grand Ave <br />12/12/2024