NDE for steel bridges

Article Abstract:

Minute flaws are still a major difficulty facing steel bridge construction and so the Federal Highway Administration is working on various forms of nondestructive evaluation technologies that can test for these flaws. Some of the methods currently being evaluated include resonant ultrasound spectroscopy, ultrasonic-magnetic crack detection, fatigue-loading indicator and acoustic emission systems. Some detection techniques likely to be included with future bridges include interferometry and embedded sensors.

Safety and security measures, Detection equipment, Detectors

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Holding up

Article Abstract:

The slurry wall foundation system, or "bathtub" , which survived the September 11, 2002 terrorist attack, is being examined for its structural stability. This article details the steps that are in the works o fortify the bathtub system. Temporary resupport is done with tiebacks to sustain the ongoing excavation and construction work.

Facilities & equipment, Science & research, Analysis, Evaluation, Buildings and facilities, Stability, World Trade Center (New York, New York), Slurry trench construction, Slurry wall construction, Stability (Physics)

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High-tech inspection

Article Abstract:

This article discusses the dire need for improved technology and techniques for construction and evaluation of bridges for impact, load, seismic, fatigue, settlement, and movement characteristics. The author opines that development of nonintrusive techniques for measurement of load capacity is of utmost importance.

Methods, Testing, Load factor design, Engineering inspection

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