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Publication Number: N/A
Date: June 2013

 

Selection of Bridges for Mid-Atlantic Prestressed Concrete and Steel Multi-Girder Bridge Clusters

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The Federal Highway Administration’s (FHWA’s) Office of Infrastructure Research and Development (HRDI) would like to announce the selection of the first 24 bridges in the Mid-Atlantic region of the United States that will be included in initial field investigations of untreated concrete bridge decks as part of the FHWA’s Long-Term Bridge Performance (LTBP) Program – a research study managed by HRDI staff that aims at identifying how bridges perform and why they perform the way they do.  These initial field investigations will focus on prestressed concrete and steel multi-girder bridge clusters within the Mid-Atlantic region. Untreated bridge decks were previously identified through stakeholder input as one of the highest priority bridge performance issues to be investigated through this study.  A list of the high-priority bridge performance issues is presented in Table 1.  We would like to emphasize that based on available resources the initial efforts of long-term data collection are focused on gaining a better understanding of the performance of untreated bridge decks.

Table 1 – List of High-Priority Bridge Performance Issues Identified Through Stakeholder Input

Untreated Concrete Bridge Decks
Treated Concrete Bridge Decks
Bridge Deck Joints
Bridge Bearings
Coatings for Steel Superstructures Elements
Embedded Prestressing Strands and Tendons

 

The selection process for bridges with untreated concrete decks in the aforementioned clusters was accomplished by first meeting with and providing each bridge owner within the Mid-Atlantic region a list of candidate bridges for possible inclusion in LTBP field studies.  Based upon local expertise, each owner prioritized the candidate bridges (high, medium, low) with respect to importance for inclusion in the study, site accessibility, plans for future rehabilitation or replacement, and traffic control needs and then provided their prioritization to FHWA.  Upon receipt of candidate bridge prioritization from all owners involved in the Mid-Atlantic clusters, a rigorous statistical analysis was undertaken to ensure adequate distribution of experimental parameters for the final selection of bridges to include in each cluster.  For more detailed information on the selection process, experimental parameters, and the experimental design of field studies, please visit the FHWA’s LTBP website at http://www.fhwa.dot.gov/multimedia/research/infrastructure/bridges/ltbp/index.cfm.

The map presented in Figure 1 shows the approximate location of the 24 bridges selected from the steel and prestressed concrete multi-girder clusters within the Mid-Atlantic region.  The map includes 4 reference bridges, e.g., bridges that will receive detailed inspection using both visual observation as well as advanced NDE technologies.  The remaining 20 bridges will undergo detailed visual inspection and limited application of NDE technologies. The steel multi-girder cluster bridges are indicated by orange locations with the 2 orange pushpins indicating steel reference bridges, while the prestressed concrete multi-girder cluster bridges are indicated by blue locations with the 2 blue pushpins indicating prestressed concrete multi-girder reference bridges.

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Figure 1 – Map showing location of steel (orange) and prestressed concrete multi-girder (blue) bridges for the Mid-Atlantic steel and prestressed concrete multi-girder clusters.

Each of the selected steel and prestressed concrete multi-girder cluster bridges within the Mid-Atlantic region presented in Figure 1 is also presented in Table 2 along with the appropriate state and structure number.

We would like to emphasize that this initial selection of bridges is pending verification through site visits and collection of initial documentation for each bridge.  In addition to the selection of reference and cluster bridges for the Mid-Atlantic region’s prestressed concrete and steel multi-girder bridges, a tentative field testing schedule has also been developed (see Table 3).  Although this tentative schedule is very aggressive, initial field evaluation of each bridge is planned to be completed by early fall 2013.  This tentative schedule is subject to review and approval by each individual bridge owner and is subject to weather conditions.  Our LTBP contractor will be contacting individual states to confirm test dates as appropriate.   Also, our LTBP contractor is currently contacting each owner to initiate the process of gathering documentation for each bridge for further study and verification purposes.  We would like to highlight that 2 of the 24 structures selected for initiation of long-term monitoring in the Mid-Atlantic region have already been inspected and results of those inspections are currently being evaluated.

Bridges in the District of Columbia have not been selected for this portion of the LTBP study as they typically contain some form of deck treatment, and therefore, will be included in the treated deck portion of the LTBP study.

Table 2 Mid-Atlantic Reference and Cluster Bridges
(Steel and Prestressed Concrete Multi-Girder Bridge Clusters)

Steel Multi-Girder Bridges Prestressed Concrete  Multi-Girder Bridges
Structure Number
(Reference Bridges)
State Structure Number
(Reference Bridges)
State
11061 VA 1143168 NJ
2920N150 DE 5043 PA
Structure Number
(Cluster Bridges)
State Structure Number
(Cluster Bridges)
State
1281 366 DE 1267N067 DE
1806 060 DE 1305N082 DE
100000070042010 MD 100000080053010 MD
832162 NJ 1328154 NJ
828156 NJ 1328153 NJ
14359 PA 21212 PA
42120 PA 14391 PA
131 VA 14216 VA
67 VA 14218 VA
00000000047A078 WV 00000000042A187 WV

 

Table 3 – Tentative Field Inspection Schedule*

State Structure # Tentative Inspection Dates
NJ 828156 March 20 – 22
VA 11061 April 2 – 5
NJ 1143168 June 3 – 6
NJ 1328153 June 10 – 14
NJ 1328154 June 17 – 21
NJ 832162 June 24 – 28
PA 5043, 42120 & 21212 July 8 – 12
PA Complete below deck inspection on 14391, 14359, 5043, 42120 & 21212 July 15 – 19
MD 100000070042010 June 24 – 26
MD 100000080053010 June 29 – 31
VA 14218  & 14216 August 1 - 5
DE 1281 366, 1267N067
1305N082
August 5 – 15
PA 14391 & 14359 August 19 – 23
WV 00000000047A078, & 00000000042A187 August 26 – 30
VA 67 & 131 September 3 – 13
DE 1806 060 & 2920N150 September 16 – 26
*Note – some of the bridges in Table 2 above may appear more than once due to multiple site visits

 

In addition to the selection of cluster and reference bridges in the Mid-Atlantic region, the bridge selection for several additional bridge clusters in Gulf, Pacific Northwest and Southwest regions is underway.  We anticipate that initial reference and cluster bridge selections within these regions will be announced in early fall 2013.  Each of these bridge clusters as well as the Mid-Atlantic clusters is shown in Figure 2.

This is a map of the continental United states showing the location of the two Mid Atlantic clusters (prestressed concrete (blue) and steel multi-girder bridges (red)), as well as clusters for the Gulf Coast (prestressed concrete (blue) and steel multi-girder bridges (red)), the Pacific Northwest (prestressed concrete multi-girder bridges (blue)), and also the Pacific Southwest Cluster (cast-in-place post tensioned concrete box girders (white)).
Figure 2 – Map showing location of Mid-Atlantic, Gulf, Pacific Northwest, and Pacific Southwest clusters.

For questions or additional information please contact Robert Zobel by telephone at 202-493-3024 or email at robert.zobel@dot.gov or visit the LTBP website at https://www.fhwa.dot.gov/research/tfhrc/programs/infrastructure/structures/ltbp/index.cfm

 

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