Posting Bridges for Specialized SingleUnit Trucks Bert Hartman

Posting Bridges for Specialized Single-Unit Trucks Bert Hartman May 2016 1

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FHWA Memo on SHV Ratings November 2013 • Category 1 Bridges – Rating factors less than 1. 3 for any of the 3 standard legal vehicles – Must be complete by December 2017 • Category 2 Bridges – All remaining load ratings need to be updated for the SHV’s – Must be complete by December 2022 – 3710 Bridges Total, 2800 Local Agency 6

Map of bridges to be evaluated by December 2017 is available https: //gis. odot. state. or. us/transgis/ 7

Weight Limit Reduced for Legal Loads 8

Weight Limit Reduced for Single Unit Vehicles Only 9

Coordination with FHWA on 29 Posted Bridges – 15 Tons or Less 10

Bridge With 15 Foot Spans 11

Concrete Bridges With No Plans (246) • Load capacity cannot be calculated • Judgement is used – Bridges in service more than 20 years with no distress have adequate load capacity for legal loads up to the SU 4 – Concrete bridges without plans that are in fair or better condition will be posted for the SU 5, SU 6, and SU 7 12

Concrete Bridges With No Plans • Reduced capacity based on condition 13

728 Category 1 Bridges To Rate • • • 259 Reinforced Concrete Girder 213 Timber 178 Steel I Girder 43 Steel Truss 15 Arch Bridges 12 Complex Bridges 4 Culverts 2 Post Tensioned Girder 2 Steel Box Girder 14

186 Category 1 Bridges Rated • 59 Reinforced Concrete Girder – 20 Rating Factors Above 1. 0 – 39 Under Review • 126 Steel I Girder – 15 Rating Factors Above 1. 0 – 111 Under Review (Bracing Issues) • 1 Post Tensioned Girder – 1 Rating Factor above 1. 0 15

Category 1 Load Rating Status • Arch Bridges – Procedures under development – 2 bridges to be rated – 13 remaining arch bridges • Timber – Procedures under development – 4 bridges to be rated – 194 remaining timber bridges 16

Load Restriction Letters • There are currently 40 bridges that are in progress for writing load restriction letters on. 17

Steel I-Girder Bridge Under Review 18

Steel I-Girder Bridge Under Review 19

Retrofit of ODOT Bridge 20

Retrofit of ODOT Bridge 96 holes drilled in the deck of a 22 foot by 26 foot bridge Cost $32, 000 21

Steel I-Girder Bridge, Steel Deck 22

Lake Slough – 99 W Built in 1919 23

Poor Reinforcement Details 24

Load Testing 25

Lake Slough • Advanced Analysis to avoid load Posting • Monthly monitoring until replaced • Replacement to be bid in Sept 2016 • Project Estimate- $2. 9 M 26

Ochoco Creek Widened Both Sides – 1954 27

No Plans for the original Bridge Freeze/Thaw Damage Shear and Flexure Cracks 28

Temporary Repair 29

Repair Cost - $55 K Replacement Cost -$2. 9 M 30

Fixing America’s Surface Transportation Act (FAST Act) 31

Fixing America’s Surface Transportation Act (FAST Act) Interstate and within reasonable access to the Interstate. Emergency Vehicle Limits – 86, 000 Lbs. GVW – 24, 000 Lbs. Single Steer Axle – 62, 000 Lbs. Tandem Axle 32

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FHWA Memo on FAST Act States Must Consider These Vehicle Weight Limits When Load Rating And Posting Highway Bridges To Maintain Compliance 34

Emergency Vehicle Tire Width • OAR 734 -082 -0009 (6/18/2015) • 635 Pounds/Inch of Tire Width • 1950’s and 1960’s bridges with “thin decks” • Pavement fatigue damage increases to the fourth power 35

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