retrofitting bridge rails · shown in the bridge railing manual existing railing that does not meet...
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![Page 1: Retrofitting Bridge Rails · shown in the Bridge Railing Manual Existing railing that does not meet the height standard or MASH or NCHRP Report 350 must be upgraded . 3R, Widened](https://reader030.vdocuments.site/reader030/viewer/2022041113/5f1eb5fc7d1587148c6d5610/html5/thumbnails/1.jpg)
October 11, 2011 Michelle L. Romage-Chambers, P.E.
Retrofitting Bridge Rails
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Retrofitting Bridge Rails
Repairs, Retrofits & Upgrades – What is TxDOT’s & FHWA’s policy Necessary Information – What information
does a designer need? Examples
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Repairs, Retrofits & Upgrades
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October 11, 2011 Michelle L. Romage-Chambers, P.E.
TxDOT & FHWA Policy
Project Specific Requirements
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Project Types
2R & Maintenance – Non freeway resurfacing or restoration projects that are not on the national system 3R- The scope varies from minor safety
improvements to more complete rehabilitation projects 4R- Reconstruction or New construction
projects
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Governing Specifications
MASH – AASHTO Manual for Assessing Safety Hardware NCHRP Report 350 – National Cooperative
Highway Research Program NCHRP Report 230 – National Cooperative
Highway Research Program
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Preventative Maintenance & 2R
Replacement with a bridge railing meeting MASH or NCHRP Report 350 is recommended but not required Must meet minimum height requirement
shown in the Bridge Railing Manual Existing railing that does not meet the height
standard or MASH or NCHRP Report 350 must be upgraded
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3R, Not Widened & No work affecting Existing Railing
Replacement with a bridge railing meeting MASH or NCHRP Report 350 is recommended but not required Must meet minimum height requirement
shown in the Bridge Railing Manual Existing railing that does not meet the height
standard or MASH or NCHRP Report 350 must be upgraded
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3R, Widened and/or Work Affecting Existing Rail
All railing on structure must comply with MASH or NCHRP Report 350 Exceptions Design Exception required if ADT is
greater than 1500 VPD Design Waiver required if ADT is less than
1500 VPD
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4R
Bridge railing must comply with MASH or NCHRP Report 350 Exceptions by approval of Design Exception
Request
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MBGF & Transitions
MBGF & Transitions must be upgraded if the bridge rail is upgraded MBGF & Transitions may be upgraded
without upgrading bridge railing
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Required Design Information
New design requirements Existing Plans Field verification
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New Design Requirements
Type of retrofit, repair, or upgrade Roadway design speed Proposed finished depth of overlay Desired transition type Deck drain requirements
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Existing Plans
Layouts (Widened Structure & Original) Abutments Joint Information Existing Approach Slab Details Spans Rail
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Field Verification
Existing railing type Height of
existing railing
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Field Verification
Slab Depth Overhang width &
depth Curb width & depth
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Field Verification
Abutment Geometry Wing Geometry
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Field Verification
Joint Information Existing overlay
depth
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Field Verification
Location of nearby road crossings Existing Approach
Slab Conditions Existing slopes
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Photos
Existing Rail Terminal Ht (all corners)
Existing Rail Average Ht (both sides)
Photo with direction info (all corners)
Photo with direction info (all corners)
Photo with direction info (all corners)
Photo of typical overhang
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Undocumented Changes
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Undocumented Changes
Gas Line
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Undocumented Changes
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Transition Details
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Example Projects
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Height Upgrade
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Transition Upgrade
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Transition Upgrade
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Transition Upgrade
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T101 RC
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T101 RC
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C402 Retrofit
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C402 Retrofit
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C402 Retrofit
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C1W Retrofit
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C1W Retrofit
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C1W Retrofit
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C1W Retrofit
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RAC-R
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RAC-R
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Quality Control - Inspection
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Summary
Replacement requirements are dependent on the type of project Provide the designer with existing plans,
photos, and new design requirements Inspection of the contractors work is
imperative
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Credits
Photos – Miscellaneous districts, Scott Dziekan, Nick Nemec, Bridge Division Field Section Design Details – John Holt, Jim Pitzer & JT
Ries
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Questions?