Sounding out scour

Article Abstract:

Multibeam sonar systems and subbottom profilers detect bridge scour better than the other techniques. These are used in scour surveys to study the water bed and material present around the bridge. The sonar systems give a high-range resolution and accuracy. Subbottom profilers are capable of determining the historical profile of bridge scour. Both sonar systems and profilers can be used during high water flow. These data can be used to construct models of the process of bridge scour.

Research, Usage, Sonar systems

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Putting the wraps on quakes

Article Abstract:

Earthquake damage to bridges can be prevented by wrapping bridge columns with continuous carbon-fiber composites. Carbon-composite retrofit wrappings are two to four times stronger than existing steel jackets while installation is less labor-intensive and require less lane closure and traffic control. These wrappings are also corrosion-resistant and are invulnerable to the effects of water and alkali.

Methods, Maintenance and repair, Bridges, Bridges (Structures), Earthquake resistant design

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Guarding against scour

Article Abstract:

The National Cooperative Highway Research Program has developed two new devices for measuring scour deposits in the bridge foundations. The devices, called the magnetic sliding collar and the sonic fathometer, can easily be installed on bridge structures and are capable of giving reliable scour data. The use of these new technologies is expected to reduce the incidence of highway bridge failures.

Measurement

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