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Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
202-366-4000


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Bridges & Structures

 

Slide 21

MAE CENTER RESEARCH SUCCESS WITH DOTs

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COLUMN AND BEAM WRAPPING

Effect of As-Built versus Retrofit

Schematic plot of probability of damage as a function of earthquake intensity for: minor damage; moderate damage; major damage, for both the as-built and retrofit cases. As-built shown with solid lines represent the "do nothing" solution. The dashed lines define performance in a retrofitted condition. This allows a determination to be made as to when retrofit is required as a function of the level of damage that is acceptable. Only the 2% EQ (probability of exceedance in 50 years or 2,500-year event) and 10% EQ (probability of exceedance in 50-years or 500 years event).

Probability of Damage (%)
 10% EQ2% EQ
As-built
Minor Damage5896
Moderate Damage2684
Major damage058
Retrofit
Minor Damage6298
Moderate Damage838
Major Damage025

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Updated: 05/26/2015
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