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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 />33 ksi <br />45 ksi <br />29000 ksi <br />Section Properties: <br />Corrugation: <br />Gage Number: <br />c (in) = <br />d (in) = <br />t (in) = <br />t (min)** (in) = <br />As (in2/ft) =1.560 <br />r (in) =0.3448 <br />I x 10-3 (in4/in) =15.459 <br />Structure Type: <br />Seam Type: <br />600.00 <br />1.00 <br />1.00 <br />0.80 <br />1.00 <br />0.67 <br />0.120 <br />0.22 <br />1.00 <br />Calculate the fcr (critical buckling stress) :(AASHTO LRFD 12.7.2.4) <br />if: <br /> <br />k = soil stiffness factor = <br />0.111 <br />φ2 = Resistance Factor for seam strength (Table 12.5.5-1) <br />1 = Resistance Factor for wall area and buckling (Table 12.5.5-1) <br />Longitudinal Length of Structure "L" (ft) = <br />** Required Minimum Top Arc Thickness if Long Span Structural Plate Structures Selected <br />φE = Factor for Distribution of Live Load with Depth of Fill <br />based on Backfill Type (per AASHTO LRFD 3.6.1.2.6)= <br />AASHTO minimum cover, "h" (ft) = <br />C. Design Calculations: <br />δ = Soil density (k/ft3) <br />φloss = Section Properties reduction factor on the basis of <br />metal loss from the materials field evaluation = <br />Corrugated Metal Pipe <br />Annular pipe w/ spot welded, riveted or bolted seam <br />Em = Modulus of elasticity of metal <br />Fy = Minimum Yield Point of the Metal <br />3 x 1 (corrugated steel pipe) <br />Depth of cover used to check AASHTO minimum cover <br />requirment "Hmin" (ft) = <br />12 <br />Fu = Minimum Tensile Strength of the Metal <br />22 <br />48 <br />,24  <br /> <br />−=< <br />r <br />kS <br />E <br />FFfthen <br />F <br />E <br />k <br />rS <br />m <br />u <br />ucr <br />u <br />m <br />Revised by ODOT 5/2016 Page 5 of 10