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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 />For typical structures :5.00 <br />11.00 <br />20% <br />-0.17 <br />long span structures:11.00 <br />5.00 <br />5.50 <br />Rt (max) * (ft) = <br />Conduits Mechanical & Section Properties: <br />Mechanical Properties: <br />Metal Type: <br />B. Design Properties <br />Then, Rt used in Load Rating Calculation (ft)= <br />LRFR of In-Service, Corrugated Metal Pipe Structures <br />(do not use this spreadsheet to load rate Structural Plate Box Culverts) <br />N/A <br />11/16/2017 <br />11/16/2017 <br />Pipe Crown Deflection = <br />Buckling Strength Reduction Factor, f * = <br />* reduction factor f is based on NCSPA Design Data Sheet No 19, II Structural <br />Evaluation A.2.b & Appendix B.1, Figure B.1.1 for Unsymmetrical structures or <br />structures deflected over 5% only. <br /> 3. For all long span structures (horizontal ellipse, low and high profile arches, inverted pear shapes and pear arches), as <br />well as other horizontal ellipses, use 2 x actual top radius (2Rt) in all cases. <br /> b. base critical buckling stress calculations on the theoretical design span, reducing the resulting allowable buckling <br />stress by the appropriate multiplier to account for deflection " f " (NCSPA Design Data Sheet No. 19, Figure B.1.1). <br />* Maximum Plate Radius allowed if Long Span Structural Plate <br />Structures Selected <br />Based on AASHTO LRFD Bridge Design Specifications, Section 3, 4 & 12 & NCSPA Design Data Sheet No. 19 & <br />ODOT Bridge Design Manual 2004 (effective 10-15-2010), Section 900 <br />A. Design Dimensions <br /> 1. For typical structures, use the actual field measured span for calculations. <br /> 2. For unsymmetrical structures or those deflected over 5%: <br /> a. use 2 x the top radius (2 Rt) in lieu of span for calculations. <br />For unsymmetrical or <br />deflect more than 5% <br />structures: <br />Design Span (ft) = 2Rt = <br />Structure Category:Typical (NCSPA design data sheet No. 19, II. A. 1.) <br />Then, Span Length used in Load Rating Calculation (ft)= <br />Design Span = Actual Span "S" (ft) = <br />Design Span (ft) = 2Rt = <br />Steel <br />Revised by ODOT 5/2016 Page 4 of 10