Advances in Structural Engineering Research
342545 - Ultrasonic Stress Measurement in Steel Buildings
Friday, April 20
3:30 PM - 5:00 PM
Recent advancement in ultrasonic technology has led to the ability to directly determine stress (strain) in steel members through measurement of the acoustic birefringence. The measured birefringence is proportional to the stress in a steel plate, and thus the magnitude and orientation of the applied stress can be deduced from the ultrasonic velocity measurements. Direct measurement of stress via ultrasonics provides a potential solution to the existing structural evaluation limitations. First, the total value of stress can be determined. This means that the existing dead and any additional live load will be measured. The value of the total stress can be compared to the know stress-strain relationship of the steel to determine how close to failure that component may be, or whether the measured amount of stress in accordance with that predicted through analysis. Second, the method requires only limited structural access. Even if there is damage in an inaccessible portion of the structure, the measurement of stress in more accessible portions will, with the help of analysis tools, be able to determine if the structure is behaving as predicted. Finally, the ultrasonic measurement of stress is nondestructive, portable, and fast. It is anticipated that the stress measurement can occur in only a few minutes and only require easily portable equipment. This research looks specifically at the application of this technology to W-flange steel sections commonly used in buildings under bending and axial loads. The research further investigates how this new non-destructive tool can impact the evaluation of damaged buildings.
The topic is on interest to an international audience and is targeted at university faculty and design professionals in the area of non-destructive testing and structural health monitoring. The audience will learn about a new technology and how that technology can be used for damage evaluation in buildings to improve the evaluation accuracy and efficiency.