BEEFING UP DETERIORATING BRIDGE DECKS
BEEFING UP DETERIORATING BRIDGE DECKS Graham Bettis, P.E. TxDOT Bridge Division 2016 Southeast Bridge Preservation Partnership
March 30, 2016
Bridge Asset Management
Routine/Cyclic Maintenance
Repair/ Minor Rehab
Major Rehab/ Replacement
Middle Step Neglected Defects Worsen SD Sub Deck Super
2016 Southeast Bridge Preservation Partnership
March 30, 2016
2
What We’re Trying to Avoid – Super and Substructures
2016 Southeast Bridge Preservation Partnership
March 30, 2016
3
What We’re Trying to Avoid – Super and Substructures
2016 Southeast Bridge Preservation Partnership
March 30, 2016
4
What We’re Trying to Avoid – Super and Substructures
2016 Southeast Bridge Preservation Partnership
March 30, 2016
5
Bridge Decks in Texas 14,000 On-System Bridges (40% of Inventory) Constructed between 1950 and 1970 Varying Deck Thicknesses in Different Eras/Bridge Types Deteriorated for Variety of Reasons – Age – Corrosion – Reinforcement Detailing
2016 Southeast Bridge Preservation Partnership
March 30, 2016
6
Severe Deck Deterioration
2016 Southeast Bridge Preservation Partnership
March 30, 2016
7
Severe Deck Deterioration
2016 Southeast Bridge Preservation Partnership
March 30, 2016
8
Severe Deck Deterioration
2016 Southeast Bridge Preservation Partnership
March 30, 2016
9
Six Inch Decks
2016 Southeast Bridge Preservation Partnership
March 30, 2016
10
Six Inch Decks
2016 Southeast Bridge Preservation Partnership
March 30, 2016
11
Thin Bridge Decks + Age = Map Cracking
2016 Southeast Bridge Preservation Partnership
March 30, 2016
12
Pan Girder Bridges – Thin Crowns
2016 Southeast Bridge Preservation Partnership
March 30, 2016
13
Pan Girder Bridges – Thin Crowns
2016 Southeast Bridge Preservation Partnership
March 30, 2016
14
Rehabilitation Approach Identify Bridges with Deteriorated Decks but “Good” or “Fair +” Substructures and Superstructures Bridge Deck Condition Ratings – 1,000,000 SF Rating
March 30, 2016
Bridge Asset Management
Routine/Cyclic Maintenance
Repair/ Minor Rehab
Major Rehab/ Replacement
Middle Step Neglected Defects Worsen SD Sub Deck Super
2016 Southeast Bridge Preservation Partnership
March 30, 2016
2
What We’re Trying to Avoid – Super and Substructures
2016 Southeast Bridge Preservation Partnership
March 30, 2016
3
What We’re Trying to Avoid – Super and Substructures
2016 Southeast Bridge Preservation Partnership
March 30, 2016
4
What We’re Trying to Avoid – Super and Substructures
2016 Southeast Bridge Preservation Partnership
March 30, 2016
5
Bridge Decks in Texas 14,000 On-System Bridges (40% of Inventory) Constructed between 1950 and 1970 Varying Deck Thicknesses in Different Eras/Bridge Types Deteriorated for Variety of Reasons – Age – Corrosion – Reinforcement Detailing
2016 Southeast Bridge Preservation Partnership
March 30, 2016
6
Severe Deck Deterioration
2016 Southeast Bridge Preservation Partnership
March 30, 2016
7
Severe Deck Deterioration
2016 Southeast Bridge Preservation Partnership
March 30, 2016
8
Severe Deck Deterioration
2016 Southeast Bridge Preservation Partnership
March 30, 2016
9
Six Inch Decks
2016 Southeast Bridge Preservation Partnership
March 30, 2016
10
Six Inch Decks
2016 Southeast Bridge Preservation Partnership
March 30, 2016
11
Thin Bridge Decks + Age = Map Cracking
2016 Southeast Bridge Preservation Partnership
March 30, 2016
12
Pan Girder Bridges – Thin Crowns
2016 Southeast Bridge Preservation Partnership
March 30, 2016
13
Pan Girder Bridges – Thin Crowns
2016 Southeast Bridge Preservation Partnership
March 30, 2016
14
Rehabilitation Approach Identify Bridges with Deteriorated Decks but “Good” or “Fair +” Substructures and Superstructures Bridge Deck Condition Ratings – 1,000,000 SF Rating
