FDOT Standard Plans Index 521-426: Traffic Railing (Median 36" Single - Slope)

Design Criteria

Design Criteria AASHTO Manual for Assessing Safety Hardware (MASH) Test Level 4 Criteria; AASHTO LRFD Bridge Design Specifications ; Structures Design Guidelines ( SDG )

Design Assumptions and Limitations

Design Assumptions and Limitations The 36" Single - Slope Median Traffic Railing is the basic default median traffic railing for use on FDOT bridges. Use this railing in accordance with the requirements of SDG 6.7. The details as shown for installing for 2" diameter conduits and associated Embedded Junction Boxes (EJBs) in traffic railings have been determined to be crashworthy in accordance with the requirements of AASHTO Manual for Assessing Safety Hardware (MASH) and the AASHTO LRFD Bridge Design Specifications .

To preserve the crashworthiness of traffic railings, no more than t hree 2" diameter conduits and associated EJBs, as shown on Index 630 - 0 10, may be installed within a traffic railing or traffic railing/noise wall. Reinforcing cover for Traffic Railings is shown as 2½", which accommodates new slip forming tolerances. For modified designs 2" minimum cover is usually adequate for stationary form construction.

Design bridge decks supporting 36" Single - Slope Median Traffic Railings in accordance with the requirements of SDG 4.2. For bridge decks up to a maximum thickness of 9", 3~Bars 5S may be placed in lieu of the longitudinal deck reinforcing in the bottom layer directly below the median barrier , provided that the total area of longitudinal deck steel beneath the railing, as required by calculation, is not reduced.

General Notes

General Notes Sheet, specify the concrete class in accordance with the superstructure environment classification. See SDG 1.4. Show and label, by name or Index number, the 36" Single - Slope Median Traffic Railing on the Plan and Elevation, Typical Section, Superstructure, Approach Slab and Finish Grade Elevations Cross Section sheets, and other sheets as required.

On the Superstructure section sheets, show the three Bars 5S placed in the bridge deck within the Bars 5W along with the rest of the deck steel. All concrete and Bars 5R, 5S and 5W required to construct the traffic railing are included in the Estimated Traffic Railing Quantities. Do not include traffic railing concrete in the estimated concrete quantities, or Bars 5R, 5S and 5W in the reinforcing b ar lists and estimated reinforcing steel quantities for supporting bridge decks or approach slabs.

Standard Plan s Instructions Topic No. 625 - 010 - 003 Index 521 - 426 Traffic Railing (Median 36" Single - Slope) When approach or trailing end traffic railing or barrier wall is shown in the plans, provide special end transition details to match the adjacent profile and height at the end of the Approach Slab. Transitions , other than those detailed in the Index should be made over a 10' - 0" length for the face profile and at 1:8 maximum slope for the height transition.

Payment

Payment Item number Item Description Unit Measure 521 - 5 - 12 Concrete Traffic Railing, Bridge, 36" Median Single - Slope, Double Face LF 630 - 2 - 16 Conduit, Furnish & Install, Embedded LF 635 - 3 - 13 Junction Box, Furnish & Install, Embedded EA .

What your plans must show

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

• In the Structures Plans: In the