FDOT Standard Plans Index 400-289: Concrete Box Culvert Details

Design Criteria

Design Criteria AASHTO LRFD Bridge Design Specifications ; Structures Design Guidelines ( SDG ) ; FDOT Design Manual ( FDM )

Design Assumptions and Limitations

Design Assumptions and Limitations Designs for box culverts shown in this Index are to be produced only by computer analysis, utilizing the Department's LRFD Box Culvert Program . Designs are to be limited to the live loads and dimensional restraints shown in the

General Notes

General Notes of this Index and to the fill on the barrel(s), as shown in the Contract Plans. Where depth of fill over the culvert(s) vary, design culvert based on the depth of fill at the center of the inside and outside lanes and ensure design is adequate for the controlling case. Headwalls with skew angles less than - 50° or greater than +50° require special design authorization.

In these cases, other design options should be considered. Contact the District Drainage Engineer to obtain authorization. At the contractor's option, Index 400 - 292 Standard Precast Concrete Box Culverts may be substituted for Index 400 - 289 cast - in - place box culverts unless specifically prohibited by a plan note.

See also the Standard Plan s Instructions Index 400 - 292.

Commentary

Commentary: Box Culverts will be included in a Structures Component Plan Set along with all appropriate Standard Plans for Bridge Construction Index sheets (see SD M 3.7) . For more guidance on Estimated Quantities Report see FDM 902 Standard Plan s Instructions Topic No. 625 - 010 - 003 Index 400 - 289 Concrete Box Culvert Details Standard Plan s Instructions Topic No.

625 - 010 - 003 Index 400 - 289 Concrete Box Culvert Details

Payment

Payment Item number Item Description Unit Measure 400 - 2 - 1 Concrete Class II, Culverts CY 400 - 4 - 1 Concrete Class IV, Culverts CY 415 - 1 - 1 Reinforcing Steel - Roadway LB

What your plans must show

Plan Content Requirements for this index — the SPI's checklist for designers.

• In the Structures Plans: For box culvert extensions with skewed joints at the connection location, consider providing additional reinforcing parallel to the joint for the full width of the culvert to ensure proper load paths for transverse forces. Provide details for these additio nal reinforcing bars in the plans and manually add these bars to the reinforcing bar list. Complete the following "Box Culvert Data Tables" and include them in the plans. See FDM 115 for more information regarding use of Data Tables. Work these data tables with the FDOT Mathcad LRFD Box Culvert Program and Index 400
• 289. Fill in tables using the “Include” Key
• - In Utility in MicroStation and line1.prn thru line6.prn files located in the program root directory. Use Structures Site Menu>Text>Table Data, which uses "Chart_TTF" Text Style and True Type Font FDOT Mono.
• Standard Plan s Instructions Topic No. 625
• - 289 Concrete Box Culvert Details Complete Notes 1 thru
• 8. In Note 6 of the Data Table show Differential Settlement (ΔY) and Effective Length (L) for single curvature deflection where significant long
• - term settlement is anticipated and precast box culverts are not specifically excluded. See Index 400
• - 291 (Sheet 5) for details. If precast box culverts are specifically excluded, delete Note
• 6. If a box culvert extension is required, investigate the constraints and condition of the existing structure to determine whether a Type I and/or Type II Connection Detail is appropriate for each Structure/Bridge Number within the project. Contact the Distr ict Structures Design Engineer (DSDE) to obtain concurrence with the recommended Connection Detail. Based on concurrence from the DSDE, in Note 7 of the Data Table specify either "Type I ", "Type II", or "Type I or Type II" for each Structure/Bridge Number within the project. If no box culvert extension is required, delete Note
• - S lope traffic railings are required add the thickness ‘ PT ’ (see Index 400
• - 289, Sheet 5, Detail “I”) to the V bar length from Index 521
• - 428 and show the dimension in the bar bending diagram on the “Box Culvert Data Tables” sheet . For other traffic railings or parapets, substitute the appropriate anchorage bar for the V bar shown and add length PT to maintain cover and embedment . When supplemental transverse bars are requ ired , add a note with the required bar size , length and spacing . Add the transverse bars to the Summary of Quantities for Box Culvert reinforcing. Note: V or other anchorage /railing bars are included in the cost of the traffic railing or parapet .