Proposed Proposed Proposed Proposed Plan to IPlan to IPlan to IPlan to Include Special Hauling Vehicle in the nclude Special Hauling Vehicle in the nclude Special Hauling Vehicle in the nclude Special Hauling Vehicle in the ODOT ODOT ODOT ODOT Load Rating Load Rating Load Rating Load Rating

Process (V 2.Process (V 2.Process (V 2.Process (V 2.1111))))

As per FHWA Memo dated: November 15, 2013 (Appendix A), the NCHRP Project 12-63 showed

the current AASHTO Type 3, 3S2, and 3-3 legal load configurations are not adequately representative

of all legal loads. Information from the study showed that trucks weighing up to 80,000 lbs. and meeting

the Federal Bridge Formula B requirements may cause stresses exceeding those stresses due to the HS20

loading by up to 22% and Type 3, 3S2 and 3-3 loads by over 50%.

Ohio currently uses its own set of legal trucks (2F1, 3F1, 4F1 and 5C1) for load rating. These truck

configurations have been in use for many years, but the recent information received from the FHWA has

prompted ODOT to re-evaluate the adequacy of these truck configurations when compared to the

Specialized Hauling Vehicles (SHV). A simple in-house comparison of moments produced by the

AASHTO SHV showed an increase of up to 25% over the Ohio legal trucks. A POA has been prepared

to incorporate the AASHTO Notional Rating Load (NRL) in the current Ohio rating practices.

1.0 1.0 1.0 1.0 Implementation of SHV Implementation of SHV Implementation of SHV Implementation of SHV for for for for New New New New and Revised and Revised and Revised and Revised Load RatingLoad RatingLoad RatingLoad Ratingssss

In addition to the current Ohio legal trucks, the NRL (and/or SHV) as per AASHTO Manual for

Bridge Evaluation, Second Edition, shall be used for all new load rating analyses. The load rating

analysis shall be performed according to one of the procedures given below. When revising the load

rating analysis of an existing bridge previously rated by Allowable Stress or Load Factor methods, the

load rater can use either the LFR (Load Factor Rating) or LRFR (Load and Resistance Factor Rating).

2.0 2.0 2.0 2.0 ImplementationImplementationImplementationImplementation of SHV Rating on the Existing Bridge Load Ratingsof SHV Rating on the Existing Bridge Load Ratingsof SHV Rating on the Existing Bridge Load Ratingsof SHV Rating on the Existing Bridge Load Ratings

The existing bridges, for which the load ratings have been completed, will be divided into Groups A, B

or C.

Group A. Any bridge with the controlling Ohio Legal RF ≥ 1.35 will not require any action

involving NRL loading unless a change in conditions occurs which would require an updated

load rating analysis, e.g., a new wearing surface or any deterioration that will require a new load

rating analysis and may cause the bridge to be in Group B or C. ODOT will conduct a study of a

set of bridges in Group A (Ohio Legal RF ≥ 1.35) to ensure those bridges will not require any

posting for SHV. The study will be completed before the FHWA Memo deadline of December

31, 2022.

Group B. All bridges with the controlling Ohio Legal RF ≥ 1.0 and RF < 1.35

a. Re-rate all bridges according to their current method of analysis (LFR or LRFR)

according to one of the procedures, given below

b. Prepare an updated BR-100 and posting recommendations, if needed

c. Update the rating factor information in the SMS

d. Post the bridge with new bridge posting sign, if needed within the period specified in the

BDM Section 900

e. Tentative completion date of calculations: December 31, 2022.

Approximate number of NBI bridges in Group B

Inspection Responsibility

COUNT Structure

File Number

ODOT 608

OTPC 100

CEAO 6157

MUNI 335

Group C. All bridges that are currently posted, i.e., with controlling Ohio Legal RF<1.0

a. Re-rate all bridges according to their method of analysis (LFR or LRFR) according to one

of the procedures, given below

b. Prepare an updated BR-100 and new posting recommendation, if needed

c. Update the rating factor information in the SMS

d. Post the bridge with new bridge posting sign, if needed within the period specified in the

BDM Section 900

e. Tentative completion date: January 1, 2018

Approximate number of NBI bridges in Group C

Inspection Responsibility

COUNT Structure

File Number

ODOT 20

OTPC 1

CEAO 1,172

MUNI 52

3.0 3.0 3.0 3.0 Procedure for Procedure for Procedure for Procedure for Load RatingLoad RatingLoad RatingLoad Rating for AASHTO HS20, Ohio Legal Trucks and for AASHTO HS20, Ohio Legal Trucks and for AASHTO HS20, Ohio Legal Trucks and for AASHTO HS20, Ohio Legal Trucks and SHV by LFR SHV by LFR SHV by LFR SHV by LFR

MMMMethodethodethodethod

Inventory or design level load rating shall be performed for the following load (Appendix B):

• AASHTO HS20

Operating level load rating shall be performed for the following load:

• AASHTO HS20

• Ohio Legal load rating shall be performed for the following loads (Appendix C):

a. 2F1 Truck

b. 3F1 Truck

c. 4F1 Truck

d. 5C1 Truck

• SHV rating shall be performed for the following AASHTO loads (Appendices D & E):

a. NRL

b. SU4

c. SU5

d. SU6

e. SU7

The analysis for the NRL shall be performed as follows: Begin by analyzing the bridge with the

NRL. In the event that the NRL rating factor is less than 1.0, rate the bridge for the SU4, SU5, SU6 and

SU7 trucks (Appendix F). If any of the rating factors for these trucks are less than 1.0, special weight

reduction posting will be required.

4.0 4.0 4.0 4.0 Procedure for Procedure for Procedure for Procedure for Load RatingLoad RatingLoad RatingLoad Rating for AASHTO HLfor AASHTO HLfor AASHTO HLfor AASHTO HL----93, Ohio Legal Trucks and 93, Ohio Legal Trucks and 93, Ohio Legal Trucks and 93, Ohio Legal Trucks and SHV by LRFR SHV by LRFR SHV by LRFR SHV by LRFR

MMMMethodethodethodethod

Inventory or design level load rating shall be performed for the following load (Appendix B):

• AASHTO HL93

Operating level load rating shall be performed for the following load:

• AASHTO HL93

• Ohio Legal load rating shall be performed for the following loads (Appendix C):

a. 2F1 Truck

b. 3F1 Truck

c. 4F1 Truck

d. 5C1 Truck

• SHV rating shall be performed for the following AASHTO loads (Appendices D & E):

a. NRL

b. SU4

c. SU5

d. SU6

e. SU7

The analysis for the NRL shall be performed as follows: Begin by analyzing the bridge with the NRL.

In the event that the NRL rating factor is less than 1.0, rate the bridge for the SU4, SU5, SU6 and SU7

trucks (Appendix F). If any of the rating factors for these trucks are less than 1.0, special weight reduction

posting will be required.

5.0 5.0 5.0 5.0 DocumentationDocumentationDocumentationDocumentation

New Rating AnalysisNew Rating AnalysisNew Rating AnalysisNew Rating Analysis: A revised rating summary form (BR100, see Appendix G) will be used to

document the rating factors for Inventory, Operating, Ohio Legal Loads and SHV ratings.

Existing RatingsExisting RatingsExisting RatingsExisting Ratings

Group AGroup AGroup AGroup A: For bridges in Group A, ODOT will maintain a SHV Analysis Exempt List (SAEL) in the

form of a spreadsheet of bridges which currently have Ohio Legal RF of 1.35 or more and mark them

as exempt from re-analysis for SHV, until a new analysis is warranted. If any bridge on SAEL will get

a new rating analysis, it will be removed from the SAEL. The spreadsheet will be stored on ODOT

O:\Bridges folder for FHWA review. Anticipated completion date to post the spreadsheet: September

1, 2015.

Group BGroup BGroup BGroup B & C& C& C& C: For bridges in Groups B & C, as the bridges will be re-analyzed in the due course, a new

BR100 Rating Summary form (Appendix G) will be prepared and stored in the bridge file by the

bridge owners.

6.0 6.0 6.0 6.0 SignageSignageSignageSignage

For bridges that will require to be posted for reduced Ohio legal and SHV loads, a new bridge load

posting sign (Appendix H) will be used. The sign will show the maximum safe loads that can be

carried on 2-axle, 3-axle, 4-axle, 5-axle and 6 or more axle trucks on the bridge.

All existing load posting signs will be replaced in the due course as the posted bridges will get re-

analyzed for the SHVs.

Appendix AAppendix AAppendix AAppendix A

Appendix B

OR

LOADS FOR INVENTORY AND OPERATING RATING

14’ Varies

14’-30’

HS20-44 Truck

8k

32k

32k

36 T

0.640 k/ft.

26k (S) 18k (M)

14’ Varies

14’-30’

HL93 Truck + Lane

8k

32k

32k

0.640 k/ft.

Appendix C

OHIO LEGAL LOADS

Ohio Legal Trucks

10 k

20 k

10’

2F1

17 k

12 k

ips

17 k

10’

3F1

4’

14 k

12 k

14 k

4F1

14 k

10’ 4’ 4’

17 k

12 k

17 k

5C1

12’ 4’ 4’31’

17 k

17 k

8 kips = 35.6 kN

10 kips = 44.5 kN

12 kips = 53.4 kN

14 kips = 62.3 kN

17 kips = 75.6 kN

20 kips = 89.0 kN

25 kips =111.2 kN

32 kips =142.3 kN

15T; 10’

23T; 14’

27T; 18’

40T; 51’

4 ft. = 1.22 m

10 ft. = 3.05 m

12 ft. = 3.66 m

14 ft. = 4.27 m

18 ft. = 5.49 m

30 ft. = 9.14 m

31 ft. = 9.45 m

51 ft. = 15.54 m

Appendix D

6’-14’ Varies

Notional Rating Load (NRL); 40T; 30’- 38’

6k

8k

4’ 4’ 4’ 4’ 4’ 4’

8k

8k

8k

8k

17k

17k

Appendix E

8 k

12 k

8 k

SU5

17 k

10’ 4’ 4’

SU7

6.0 k = 26.7 kN

8.0 k = 35.6 kN

11.5 k = 51.2 kN

12.0 k = 53.4 kN

17.0 k = 75.6 kN

31T; 22’ 4’ = 1.22 m

6’ = 1.83 m

14’ = 4.27 m

18’ = 5.49 m

22’ = 6.71 m

26’ = 7.92 m

30’ = 9.14 m

17 k

12 k

8 k

SU4

17 k

10’ 4’ 4’

27 T; 18’

17 k

4’

8 k

11

.5 k

8 k

SU6

10’ 4’ 4’ 4’

17 k

17 k

4’

8 k

8 k

11

.5 k

8 k

10’ 4’ 4’ 4’

17 k

8 k

17 k

4’

8 k

4’

34.75T; 26’

38.75T; 30’

Appendix F (a)

Flow Chart for Load Rating Analysis

(Continued on next page)

Is the bridge

designed for

HL93 load?

Yes Perform Inventory and operating

rating analysis for HL93 loads by

LRFR method

Perform Inventory and operating

rating analysis for HS20 loads by

LFR method

No

Appendix F (b)

Flow Chart for Load Rating Analysis

Perform load rating for 2F1, 3F1,

4F1, 5C1 Trucks and NRL*

Yes Are all RF

≥ 1.00?

Perform load rating for

SU4, SU5, SU6 and SU7*

Prepare BR-100

for bridge file

No

Check your load

rating model, Verify

results, re-analyze, if

needed

RF for NRL

≥ 1.00?

Yes

No

Prepare BR-100 &

recommend for

reduced load posting

Prepare load posting

sign & erect on the

bridge

* Use the same method as

Inventory and Operating

Rating Analysis

Appendix G

ODOT LOAD RATING SUMMARY (BR-100 Revised 2015/07)

Appendix H

NEW BRIDGE LOAD POSTING SIGN

(Size: 36 inches by 60 inches)