FDOT Standard Plans Index 536-002: Guardrail Transitions and Connections for Existing Bridges

Design Criteria

Design Criteria NCHRP Report 350 ; AASHTO LRFD Bridge Design Specifications , 6th Edition, Section 13; AASHTO Roadside Design Guide , 4 th Edition; Structures Design Guidelines ( SDG ) ; FDOT Design Manual ( FDM )

Design Assumptions and Limitations

Design Assumptions and Limitations Index 536-002 contains details for attaching guardrail approach transitions to Standard Plans 460-470 Series (Thrie-Beam Retrofit) and 521-400 Series (Vertical Face Retrofit) bridge traffic railings as well as existing safety shape bridge traffic railings. In the Roadway Plans, the Engineer of Record (EOR) must show their selected options as referenced by Index 536-002 for the Standard Plans 460-470 Series and/or 521-400 Series based on the selected retrofit and existing bridge structures. Accordingly, the EOR must call out the project-specific Scheme information for each location as it corresponds to their chosen connection in Index 536-002 (e.g., “Index 536-002, Sheet 24, Scheme 1”).

For limiting requirements of the wing walls, see the Standard Plans Instructions for Index 521-480 . For general information, see the Standard Plans Instructions for 460-470 Series and 521-400 Series Indexes , FDM 215 , and SDG 6.7 . For guardrail connections to existing bridges, use the guardrail lengths shown in Index 536-002 .

Where a longer guardrail run is required to shield roadside hazards, extend the guardrail following the Length-of-Need method of the AASHTO Roadside Design Guide. NOTE: The downstream connection stationing provided by the Guardrail Length of Need Program (Excel) for Index 536-001 is not compatible with Index 536-002 . The following three sections of instructions address the use of Index 536-002 with existing safety shape bridge traffic railings: A Historical Compilation of Superseded Florida Department of Transportation "Structures Standard Drawings" for "F" and "New Jersey" Shape Structure Mounted Traffic Railings Guardrail Approach Transition Retrofit Instructions for Existing Flat Slab Bridges Guardrail Approach Transition Retrofit Instructions for Existing Beam/Girder Bridges Index 536-002 Thrie-Beam Guardrail transition retrofits are bolted to existing safety shape bridge traffic railings through field drilled holes utilizing the pre-drilled Thrie-Beam Terminal Connector as a template.

This method of attachment creates the potential for conflicts between the new attachment bolts and existing utilities and/or conduits. Index 536 - 002 Guardrail Transitions and Connections for Existing Bridges Compare the locations of the new attachment bolts with the positions of any existing utilities and/or conduits. Guidance is provided on Index 536-002 for selecting a bolt pattern for the Thrie-Beam Terminal Connector that may avoid existing utilities and/or conduits.

Existing utilities and/or conduits that conflict with the possible bolt patterns shall be relocated if possible or placed out of service. Include all necessary utility adjustment information in the Roadway Plans. 1.

A Historical Compilation of Superseded FDOT Structures Standard Drawings for "F" and "New Jersey" Shape Structure Mounted Traffic Railings: The following list of superseded standard drawings and associated railing typical sections and end transition details are presented as a historical reference for use when evaluating existing safety shape structure mounted traffic railings. Utilities and/or conduits may exist in or adjacent to existing traffic railings and will vary in size, number and location. Utilities and/or conduits are not shown on these railing typical sections or end transition details.

Welded Wire Reinforcing (WWR) may have been used in place of the conventional reinforcing steel shown on the railing typical sections. Reinforcing steel was not standardized for railing end transitions but was instead included with the end bent reinforcing steel as a project specific design. Thus, some degree of variability can be expected for this reinforcing steel.

Superseded FDOT Structure Mounted Traffic Railing Standards Standard Index No. …

General Notes

General Notes: Paint reinforcing steel that is exposed during drilling/coring of the Terminal Connector bolt holes with a zinc rich galvanizing compound in accordance with Specification 562 .

Payment

Payment Item number Item Description Unit Measure 536-1-AA Guardrail - Roadway LF 536-8-AB Guardrail –Transition Connection to Rigid Barrier (Approach or Trailing) EA 536-73 Guardrail Removal LF See the BOE and Specification 536 for additional information on payment, pay item use and compensation.

What your plans must show

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

• In the Roadway Plans: Call out the project-specific connection scheme information as described in the Design Assumptions and Limitations above. Include the following note in the