Are We Abandoning Bridges with Remaining Life?

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Presentation transcript:

Are We Abandoning Bridges with Remaining Life? Dave Whitmore Vector Corrosion Technologies

Corrosion Ravaged Column Repaired and still in service Corrosion Ravaged Column

Corrosion Ravaged Columns Not repaired. Demolished and replaced Corrosion Ravaged Columns Chicago, Illinois

Abandoning Structures: Outline How do we Decide When to Replace? What are the Criteria? Who Decides? Is the Structure Really Finished? Is it Practically Preservable What Information do we Need to Make This Decision? Are we Collecting the Right Information? Case Studies

Compliments of Computer History Museum

How Do We Decide to Replace a Bridge? Functional Reasons # Lanes, Width, Shoulders, Etc. Not Entirely Functional Reasons Policy (May include Age and Type of Structure) Guidelines / Criteria (ie. % Delaminated Area, Rehab Cost vs Replacement Cost) Bridge Rating (less than ??) / Appearance / Other These Methods Assume Correlation to Capacity, Safety and Service Life Deterioration will Continue Unabated

Bridge Deck Deterioration Bridge Replaced

Substructure with Deterioration. Long Term Rehabilitation completed.

Coniston Creek Bridge, 1975. Concern about capacity Coniston Creek Bridge, 1975. Concern about capacity. Load testing confirmed it had ample capacity.

Perley Bridge. 34 spans between Ontario and Quebec Perley Bridge. 34 spans between Ontario and Quebec. Bridge was posted 40 ton max load. Posting removed in 1975. Bridge replaced in 2000 due to narrow width and corrosion.

Manitou Bridge (to Toronto Island). Concrete encased steel beams Manitou Bridge (to Toronto Island). Concrete encased steel beams. Was posted 6.8 ton max load. Posting removed 1979. No posting to date.

101 Bridges Bridge inspection in Canada is largely visual Bridges instrumented and load tested 75% of Bridges had higher load carrying capacity than presumed from analysis

St. Adolphe over Red River Portion of bridge demolished due to failure / slide of one bridge pier. Two beams from one span were load tested to determine actual capacity.

Strain gauges installed to monitor during loading.

Two girders held almost 500,000 lb mid-span point load!

I-480 Omaha Bridge repaired in 1997.

Piers after ECE Treatment and Coating Application ECE Completed Bridge remains in service today Piers after ECE Treatment and Coating Application

I-480 Omaha Environmental / Sustainability Benefit 6,700 yd3 of concrete was maintained in service. Reduced CO2 emissions by 3,350 tons. Equivalent to annual emissions of 670 people.

Lake Pontchartrain Causeway Case Study: Hwy 11 Lake Pontchartrain Causeway Despite the dire warnings in the news video, the US 11 bridge remains in service Repairs to extend its service life are in progress

Lake Pontchartrain Causeway Case Study: Hwy 11 Lake Pontchartrain Causeway This bridge is currently being repaired and strengthened (2017 – 2018). Repairs to address corrosion and extend service life are in progress

Presentation Summary How Do We Decide When to Replace a Bridge? Visual Appearance vs Testing Data Guidelines / Criteria vs Analysis

Thank You ?