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Bridge No:Bowie Resources PID Number: <br />SFN:N/A Project No: <br />Year Built:~1975 Load Rated By:JR Date: <br />Bridge Type:Corrugated Metal Pipe Checked By:LH Date: <br />LRFR of In-Service, Corrugated Metal Pipe Structures <br />N/A <br />11/16/2017 <br />11/16/2017 <br /> 1. Operating Load Rating Factor (RFO): <br /> a. RFO based on wall strength <br /> b. RFO based on minimum cover requirements <br /> Where, 1.00 <br />So, RF O-C =1.00 <br />HL-93 Truck HL-93 Tandem 2F1 3F1 4F1 5C1 <br />SU4, SU5, <br />SU6, SU7 <br />Tcap 19.23 19.23 19.23 19.23 19.23 19.23 19.23 <br />ϕc ϕs <br />TE 7.92 7.92 7.92 7.92 7.92 7.92 7.92 <br />γEV 1.95 1.95 1.95 1.95 1.95 1.95 1.95 <br />ƞR 1.05 1.05 1.05 1.05 1.05 1.05 1.05 <br />T(L+IM)0.75 0.90 0.49 0.64 0.64 0.64 0.64 <br />γLL 1.35 1.35 1.30 1.30 1.30 1.30 1.30 <br />RFO-W 0.13 0.11 0.20 0.15 0.15 0.15 0.16 <br />RFO-C 1.00 1.00 1.00 1.00 1.00 1.00 1.00 <br />RFO 0.13 0.11 0.20 0.15 0.15 0.15 0.16 <br /> 2. Inventory Load Rating Factor (RFi): <br /> a. RFi based on wall strength <br /> PD = Total Load being Distributed <br /> Saxle 2 = distance from the 1st adjacent axle to the 2nd adjacent axle, if the spacing is > 4', input Saxle2 = 0. <br /> ρ (L+IM) = pressure at crown due to live load plus dynamic load allowance <br /> AD = Total Load Distributed Area <br />D. Load Rating Factors for Ring Compression Structures: <br />0.85 <br />Operating Load Rating Factors, RF O <br />One lane loaded. Longitudinal pressure overlaps are considered for two adjacent heavy axle loads when the <br />Saxle is ≤ 4 feet. If the span length is long enough for more axles of loads overlapping at crown location, hand <br />calculations have to be done to consider the additional loads and PD & AD values have to be overwritten for <br />those cases. <br />( )IMLLL <br />EREVcapsc <br />WO T <br />TT <br />RF <br />+ <br />− <br />−=γ <br />ηγϕϕ <br />2 <br />2 <br />min <br />)(hC <br />HRFCO=− <br />=≤+=0.1528.036.2 min <br />S <br />HC <br />EREVcapsc <br />Wi <br />TT <br />RF− <br />−=γ <br />ηγϕϕ <br />Revised by ODOT 5/2016 Page 9 of 10