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Ohio Department of Transportation

John R. Kasich, Governor Jerry Wray, Director

November 8, 2018

Update on Bridge Load Rating

Amjad Waheed, PE

Assistant Administrator

Office of Structural Engineering

Association for Bridge Construction

and Design

South West Chapter

➢ Update on AASHTOWare Bridge Software

➢ Update on BDM Section 900

➢ FAST Act and Load Rating for Emergency

Vehicles

➢ AASHTO Manual of Bridge Evaluation 3rd

Edition

• Bridge Design and Rating

• Bridge Management

https://aashto.mbakercorp.com/Pages/default.aspx

BrD

BrR

4

• Released: October 2018

• Features in 6.8.3

• Modernized Analysis Engine

• Legacy Engine

• All capabilities of 6.8.2

• New Features coming later in 6.8.4/7.0.0

• New interface (new windows)

• Complete new modernized engine

Product Concept

AASHTOWareBridge

Database(Oracle or SQL Server)

BAR7Import

BARSImport

BRASSImport

Import Utilities

ASD

AASHTOWareDesign and Rating Engines

LFD

LRFR

Line GirderAnalysis

Specifications

Analysis

LRFD

3D Analysis

3rd-PartyEngine

3rd-PartyEngine

3D CurvedAnalysis7

9

Rating Use CasesLoad rating based on inspection results

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6.8.3 Beta Analysis Time Comparison (from Caltrans)

Type Legacy Modernized Mod/Leg x Faster

3 span RC Box 1831 709 39% 2.6

2 span RC Box 2666 911 34% 2.9

4 span slab 544 330 61% 1.6

4 span slab 482 363 75% 1.3

4 span PS-I 2182 798 37% 2.7

3 span PS-I 1830 389 21% 4.7

Total Time (sec)

Test Case – 10 span continuous P/S I beam

Legacy: 172 seconds

Modernized: 40 seconds

Modernized Engine was 4.3 times faster

Test Case A: PCITrainingBridge6Test Case B: Modified Example7 - 10 spansTest Case C: Multi-Cell Box - 4 span - 6 cells

0

20

40

60

80

100

120

140

160

180

200

A B

Tim

e (

seconds)

Test Case

(Smaller times are better)

Legacy vs Modernized Engine Performance -

Prestressed

Legacy

Modernized

0

500

1000

1500

2000

2500

3000

3500

4000

4500

C

Tim

e (

seconds)

Test Case

(Smaller times are better)

Legacy vs Modernized Engine Performance -

Multi-Cell Box

Legacy

Modernized

Bridge Design Manual Section 900 STRUCTURE LOAD RATING

UpdatesJanuary, 2019

October 30, 2018

Fixing America’s Surface Transportation Act

Signed into law by the President Obama on

December 4, 2015

Section 5577.02 of the ORC exempts vehicles

operated by any municipal or volunteer fire

department from weight restrictions listed in

ORC 5577.01 through 5577.14. ODOT’s Chief

Legal interprets these sections of the ORC

such that emergency vehicles can operate on

all public roads in the state without weight

restrictions. According to the interpretation of

the ODOT’s Chief Legal, these sections of the

ORC do not restrict emergency vehicles from

using posted bridges.

✓ Ensure the people, equipment, goods etc., can

safely travel on the bridges;

✓ Ensure the bridges remain safe and usable to

travel during bridges’ anticipated life span;

✓ Comply with all Federal and State laws

However,

✓ Emergency Vehicles are allowed to travel

unrestricted on roads and bridges in Ohio to

perform their duties, per the ORC

❖ Analyze the bridges for the vehicles travelling on

them

❖ Inform the operators of the vehicles if those

bridges are not safe to travel

▪ By posting those bridges for the reduced and

safe load limits

▪ Communicate with the operators

• Compliance with the FHWA Memo dated

November 3, 2016

• https://www.fhwa.dot.gov/bridge/loadrating/161103

.cfm

1. Load rate all Group 2 NBI highway bridges

carrying Interstate and within reasonable

access for FAST Act EV2 and EV3

vehicles and post them, if needed, by

December 31, 2019

2. Load rate other Group 2 NBI highway

bridges by December 31, 2022

3. All new load ratings shall include EVs as

the legal rating vehicles

Priority 1

1) Highway NBI bridges carrying Interstate &

within one mile from the interchange with

the Interstate

i. Inventory RF < 1.0 for HS20-44 Loading

ii. Inventory RF < 0.9 for HL93 Loading

FHWA Deadline of December 31, 2019

Priority 2

1) Highway NBI bridges Not done under

Priority 1

i. Inventory RF < 1.0 for HS20-44 Loading

ii. Inventory RF < 0.9 for HL93 Loading

FHWA Deadline of December 31, 2022

A bridge carrying highway traffic and

having an opening measured along the

center of the roadway of more than 20 feet

Amjad Waheed, PE

Bridge Management Section

Office of Structural Engineering

ODOT, Columbus, Ohio

Email: amjad.waheed@dot.ohio.gov

Phone: 614-752-9972