historic on- system truss management plan€¦ · environmental division evaluated each bridge for...
TRANSCRIPT
Transportation Short Course 2018 October 2018
HISTORIC ON-SYSTEM TRUSS MANAGEMENT PLAN
October 2018
Transportation Short Course 2018 October 2018
Background
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Transportation Short Course 2018 October 2018
Background
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Business 59 at Colorado River, YKM
Transportation Short Course 2018 October 2018
Background
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Transportation Short Course 2018 October 2018
On-System Truss Management Team
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Historic On-System Truss
Management PlanEnvironmental
DivisionBridge
Division
Transportation Short Course 2018 October 2018
On-System Truss Management Team
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Historic On-System Truss
Management PlanEnvironmental
DivisionBridge
Division
ProgrammaticAgreement
Transportation Short Course 2018 October 2018
Programmatic Agreements
”Programmatic Agreements (PAs) are an effective tool for developing and documenting procedures and strategies for managing historic bridges. [They] outline the process for complying with federal regulations for cultural resources, including bridges, and that facilitate implementation of historic bridge programs.”
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Programmatic Agreement
-Mead and Hunt, “Historic Bridge Programmatic Agreements: Best Practices and Examples”
Transportation Short Course 2018 October 2018
Programmatic Agreements
Many other states already have Programmatic Agreements for historic bridges
TxDOT currently has a Programmatic Agreement for Post-1945 bridges that are now historic
The Section 106 process and individual 4(f)s are still required for each historic bridge when a project is planned
Programmatic agreements can be renegotiated in extenuating circumstances, such as a catastrophic event
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A few things to note…
SH 310 at Lamar, UPRR, Budd and S. Hawn Service Rd, DAL
Transportation Short Course 2018 October 2018
Programmatic Agreements
Allows historic truss bridge assets to be viewed holistically
Provides a better understanding the level of need versus the resources available
Allows TxDOT to concentrate funding on the best candidates for continued service
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What are the benefits of a Programmatic Agreement?
Transportation Short Course 2018 October 2018
Programmatic Agreements
Reduces time required for negotiations with Historic Commission and Historic Bridge Foundation
Reduces risks and surprises related to negotiations during project development
Helps projects let on time
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How does a Programmatic Agreement help with Project Delivery?
CR 355 at San Gabriel River, BRY
Transportation Short Course 2018 October 2018
Project Status
We are in the early stages of developing the Programmatic Agreement for TxDOT’s on-system truss inventory
We have identified all on-system historic trusses and developed a preliminary list of recommendations for each
The preliminary list has been reviewed by Districts, Bridge Division, and Environmental Division
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Where we are now…
SH 203 at Salt Fork of Red River, CHS
Transportation Short Course 2018 October 2018
Project Methodology
Team consisting of folks from Bridge and Environmental Divisions identified 34 on-system trusses
Total number of on-system trusses includes two trusses that have been removed from vehicular service, but are still owned by TxDOT
Most on-system truss bridges are located in central and southeast areas of the state
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How many trusses do we have on-system?
Transportation Short Course 2018 October 2018
Project Methodology
Environmental Division evaluated each bridge for historic significance, while Bridge Division reviewed condition data to assess the need for repairs
All trusses that received previous major rehabilitation work, or are programmed to receive a major rehabilitation, will continue to be maintained and rehabilitated as needed.
The remaining bridges were ranked based on several factors, including
-Current condition-Difficulty and extents of required repairs-Extents and severity of impact damage
Based on these categories, each bridge received a weighted score that determined its position on the final list
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How were the trusses evaluated?
Transportation Short Course 2018 October 2018
Evaluation Criteria
These trusses tended to be in good condition, or a good candidate for rehabilitation
This criteria tended to capture bridges with that are highly historically significant, or that have a high level of local interest
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Why consider previous rehabilitations?
Transportation Short Course 2018 October 2018
Evaluation Criteria
Condition received the highest weight in the scoring criteria
Condition ratings for superstructure and substructure were considered, along with sufficiency rating and rehabilitation feasibility
Deck condition was not considered since deck replacement is a part of a major rehabilitation
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How was condition considered?
Transportation Short Course 2018 October 2018
Evaluation Criteria
Rehabilitation feasibility was divided into two separate categories: floor systems and truss members
Trusses with minimal repairs scored higher for rehabilitation feasibility
Trusses with more extensive, but minor or easily repaired damage, scored higher than those with damage that is difficult to repair
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What determines rehabilitation feasibility?
Transportation Short Course 2018 October 2018
Evaluation Criteria
Difficult to repair damage includes items such as gusset plates replacement, or damage that can only be repaired by providing an alternate load path during the replacement procedure
Damage that cannot be corrected due to site conditions, such as stream migration, would also score lower for rehabilitation feasibility
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What constitutes a difficult repair?
Transportation Short Course 2018 October 2018
Evaluation Criteria
Floor system members are generally easy to replace as connections are less complex and members can be removed with limited impact to the entire system
Most truss floor systems will require replacement at some point due to design strength or corrosion along the top flange
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Why consider the floor system separately?
Transportation Short Course 2018 October 2018
Evaluation Criteria
Since most on-system trusses are through trusses, both horizontal and vertical clearance is limited
Traffic needs may have changed from what the truss was originally designed to accommodate
Widespread impact damage indicates that a truss may no longer be functional for the types of traffic it sees
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Why consider impact damage?
Transportation Short Course 2018 October 2018
Evaluation Criteria
The condition evaluation identified 24 of the remaining 34 on-system trusses that are recommended for continued maintenance and rehabilitation
All recommendations were reviewed and approved by folks from the Bridge Division Field Operations Section
District Bridge Engineers and Directors of Transportation Planning and Development have concurred with the recommendations
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What are the results of the evaluation?
Transportation Short Course 2018 October 2018
Evaluation Criteria
Present the proposal to the State Historic Preservation Officer (SHPO) of Texas Historic Commission
Develop estimates for repairs and maintenance to be used in discussions for maintenance plans and funding
Develop and execute a programmatic agreement for on-system historic truss bridges
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What are the next steps?
Transportation Short Course 2018 October 2018
Evaluation Criteria
Jamie GriffinBridge Division
Project Development [email protected]
(512) 416-2247
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Questions?