Bridge 2 Load Rating Table.pdf
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- Solicitation number
- N4008523R2622
About this file
This document contains a bridge load rating report and related federal contract opportunity. The bridge load rating report evaluates Bridge 2 at the Portsmouth Naval Shipyard in Kittery, Maine under various vehicle load scenarios before and after proposed repairs. It provides inventory and operating rating factors and load ratings in tons for several vehicles including the HL-93 design vehicle, HS-20 design vehicle, H-20 design vehicle, and several special hauling vehicles. The controlling structural members are identified for each rating.
The related federal contract opportunity is solicitation number N4008523R2622 for bridge structural repairs at the Portsmouth Naval Shipyard in Kittery, Maine to be awarded by the Department of the Navy Naval Facilities Engineering Command. The solicitation and applicable attachments should be reviewed for requirements. No other details are provided about the required products or services, response dates, or award dates.
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Text version
Naval Facilities Engineering Command Bridge 2 Bridge Load Rating Report December 13, 2022
ES-2
westonandsampson.com rating is used for posting purposes. The following definitions for Inventory and Operating ratings, respectively, are taken from the American Association of State Highway and Transportation Officials (AASHTO) Manual for Bridge Evaluation (2nd Edition).
“Load ratings based on the Inventory level allow comparisons with the capacity for new structures and, therefore, results in a live load, which can safely utilize an existing structure for an indefinite period of time.”
“Load ratings based on the Operating rating level generally describe the maximum permissible live load to which the structure may be subjected. Allowing unlimited numbers of vehicles to use the bridge at
Operating level may shorten the life of the bridge.”
The following tables summarize the rated loads and rating factors determined by the analysis:
Table 1: Scenario #1 Rating Factors – Bridge Repairs with Vehicle Rail
RATING
VEHICLE
RATING
LEVEL
VEHICLE
WEIGHT
INVENTORY RATING OPERATING RATING
CONTROLLING
MEMBER RATING
FACTOR
LOAD
RATING
(TONS)
RATING
FACTOR
LOAD
RATING
(TONS)
HL93 Design - 1.20 43.21 1.56 56.27 Interior Stringer Shear
HS20 Design 36 Tons 1.71 61.74 2.22 80.03 Interior Stringer Shear
H20 Design 20 Tons 1.74 34.82 2.25 45.14 Interior Stringer
Shear
RATING
VEHICLE
RATING
LEVEL
VEHICLE
WEIGHT
LRFR
RATING
FACTOR
LOAD
RATING
(TONS)
LRFR SAFE
POSTING LOAD
(TONS)
CONTROLLING
MEMBER
Type 3 AASHTO
Legal
25 Tons 2.57 64.45 - Main Girder
Flexure
Type 3S2 AASHTO
Legal
36 Tons 2.82 101.78 - Main Girder
Flexure
Type 3-3 AASHTO
Legal
40 Tons 3.13 125.21 - Main Girder
Flexure
SU4 SHV 27 Tons 2.30 62.12 - Main Girder
Flexure
SU5 SHV 31 Tons 2.21 68.63 - Main Girder
Flexure
SU6 SHV 35 Tons 2.21 76.94 - Main Girder
Flexure
SU7 SHV 39 Tons 2.21 85.79 - Main Girder
Flexure brian.stoddard Snapshot
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