1. |
Data Collected |
|
| 1.1 |
Information and data related to load ratings of the bridge. |
|
|
2. |
Onsite Equipment and Personnel Requirements |
|
| 2.1 |
Equipment: |
|
| 2.1.1 |
Computer. |
|
| 2.1.2 |
Scanner. |
|
| 2.2 |
Personnel: PRE-PL-LO-005, Personnel Qualifications. |
|
|
3. |
Methodology |
|
| 3.1 |
Work with the bridge owner to obtain bridge rating information for the year in which the bridge is first load rated and for each subsequent year ratings were calculated (data collection table items8–18). |
|
| 3.2 |
If the bridge information exists only in paper form, scan that information into an electronic format so it can be stored in the LTBP Bridge Portal. |
|
| 3.3 |
Storing data, documents, and images: |
|
| 3.3.1 |
FLD-DS-LS-001, Data, Document, and Image Storage—Local, for local storage. |
|
| 3.3.2 |
FLD-DS-RS-001, Data, Document, and Image Storage—Remote, for remote storage. |
|
| 3.4 |
Reporting: Transfer all metadata, data, documents, and images to Federal Highway Administration (FHWA), and/or upload all metadata, data, documents, and images into the LTBP Bridge Portal. |
|
|
4. |
Data Collection Table |
|
| 4.1 |
Table: |
|
| # |
Field Name |
Data Type |
Accuracy |
Unit |
Field Description |
Row Color |
| 1 |
State |
Text |
Text |
|
State Code; e.g., Virginia = VA |
Green |
| 2 |
NBI structure number |
Text |
Text |
|
Item 8, structure number; from NBI Coding Guide |
Green |
| 3 |
Structure name |
Text |
Text |
|
Descriptive name for the bridge; e.g., Route 15 SB over I–66 |
Green |
| 4 |
Protocol name |
Text |
Text |
|
Title of the protocol |
Green |
| 5 |
Protocol version |
Text |
Month and year |
|
Month and year the protocol version was published; e.g., May 2015 |
Green |
| 6 |
Personnel performing data collection activities |
Text |
Text |
|
First name(s) Last name(s) |
Green |
| 7 |
Date data were collected |
Text |
Exact date |
|
mm/dd/yyyy |
Green |
| 8 |
Month and year of ratings |
Text |
Exact month and year |
|
mm/yyyy; month and year that ratings were calculated |
Blue |
| 9 |
Rating calculated by consultant, State, or local |
Predefined list |
|
|
Consultant
State agency
Local agency |
Yellow |
| 10 |
Person(s) rating the bridge |
Text |
|
|
Name(s) and affiliations |
Yellow |
| 11 |
Method used to determine operating rating |
Predefined list |
|
|
Load factor rating
Allowable stress rating
Load and resistance factor rating
Load testing
No rating analysis performed |
Yellow |
| 12 |
Calculated operating rating |
Numeric |
0.1 |
T |
1T = 2,000 lbs |
Yellow |
| 13 |
Method used to determine inventory rating |
Predefined list |
|
|
Load factor rating
Allowable stress rating
Load and resistance factor rating
Load testing
No rating analysis performed |
Yellow |
| 14 |
Calculated inventory rating |
Numeric |
0.1 |
T |
1T = 2,000 lbs |
Yellow |
| 15 |
Rating vehicle used |
Text |
|
|
|
Yellow |
| 16 |
Was the bridge posted, or continued to be posted, as a result of these ratings/load testing? |
Predefined list |
|
|
Yes
No
Continued Posting |
Yellow |
| 17 |
Posted load |
Numeric |
1 |
ton(s) |
Posted load capacity, if any, due to these load ratings or load testing |
Yellow |
| 18 |
Comments |
Text |
|
|
|
Orange |
|
| 4.2 |
Table Key: |
|
| Column Descriptions |
# |
Sequential number of data item |
Field Name |
Data field name |
Data Type |
Type of data, such as text, number, predefined list, binary large object (BLOB), or PDF file |
Accuracy |
Accuracy to which the data are recorded |
Unit |
Unit in which a measurement is taken and recorded |
Field Description |
Commentary on the data or list of items in a predefined list |
| Row Color Key |
Green |
Data items only entered once for each protocol for each day the protocol is applied |
Pink |
Logical breakdown of data by elements or defect types (not always used) |
Blue |
Data identifying the element being evaluated or the type of defect being identified |
Yellow |
LTBP data reported individually for each element or defect identified |
Orange |
Comments on the data collection or data entered |
|
|
5. |
Criteria for Data Validation |
|
| 5.1 |
None. |
|
|
6. |
Commentary/Background |
|
| 6.1 |
This protocol provides guidance for collecting data on calculations performed by the bridge owner to determine the load rating of the bridge. |
|
| 6.2 |
The operating rating is the maximum permissible live load to which a bridge may be subjected for the load configuration used in the rating. |
|
| 6.3 |
The inventory rating is that load, including loads in multiple lanes that can safely use the bridge for an indefinite period of time. |
|
| 6.4 |
See the AASHTO Manual for Bridge Evaluation, 2nd Edition (2010) for descriptions of the following: |
|
| 6.4.1 |
The load factor rating method. |
|
| 6.4.2 |
The allowable stress rating method. |
|
| 6.4.3 |
The load and resistance factor rating method. |
|
| 6.4.4 |
Load testing procedures. |
|
| 6.4.5 |
Rating vehicle for load tests. |
|
|
7. |
References |
|
| 7.1 |
LTBP Protocols: |
|
| 7.1.1 |
PRE-PL-LO-005, Personnel Qualifications. |
|
| 7.1.2 |
FLD-DS-LS-001, Data, Document, and Image Storage—Local. |
|
| 7.1.3 |
FLD-DS-RS-001, Data, Document, and Image Storage—Remote. |
|
| 7.2 |
External: |
|
| 7.2.1 |
AASHTO, AASHTO Manual for Bridge Evaluation, 2nd Edition, Washington, DC, 2010. |
|
| 7.2.2 |
FHWA-PD-96-001, Recording and Coding Guide for the Structure Inventory and Appraisal of the Nation’s Bridges, Federal Highway Administration Office of Engineering, Washington, DC, 1995. |
|
| 7.2.3 |
FHWA Memorandum, Bridge Load Ratings for the National Bridge Inventory, Federal Highway Administration Office of Infrastructure, Washington, DC, October 30, 2006. |
|
