Advances in Structural Engineering Research

Single Abstract

342545 - Ultrasonic Stress Measurement in Steel Buildings

Friday, April 20
3:30 PM - 5:00 PM
Location: 202CD

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.

Sarah Orton

Associate Professor
Univerisity of Missouri

Sarah Orton is an Associate Professor at the University of Missouri Columbia. She received her B.S. from the University of Texas at Austin; M.S. from the University of Illinois Urbana Champaign; and Ph.D. from the University of Texas at Austin. She is chair of the Disproportionate Collapse Technical Committee, member of the Disproportionate Collapse Standards Committee, and Retrofit of Structures under Dynamic Loads committee. Her research interests include structural strengthening, extreme events on structures, and innovative materials.

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Glenn Washer

Professor
University of Missouri

Glenn Washer is a Professor at the University of Missouri – Columbia (MU). Before joining the University, Dr. Washer was with the Federal Highway Administration (FHWA) at the Turner Fairbank Research Center (TFHRC) where he served as the director of the FHWA Nondestructive Evaluation (NDE) program. Dr. Washer has expertise in a wide variety of NDE technologies for the condition assessment of highway bridges, including ultrasonics, thermography, ground penetrating radar, radiography and the visual inspection of bridges. He has published more than sixty conference and journal papers on the development of NDE technologies and their application bridge condition assessment. Dr. Washer received his Ph.D. in Materials Science and Engineering from the Center for Nondestructive Evaluation (CNDE) at the Johns Hopkins University in 2001. He received a Masters degree in Structural Engineering from the University of Maryland in 1996 and his Bachelors Degree in Civil Engineering from Worcester Polytechnic Institute in 1990.

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Ahmed Al-Zuheriy

PhD Candidate
University of Missouri

Ahmed Al-Zuheriy is a Ph.D. Candidate at the University of Missouri Columbia. He received M.Sc. Degree in Structural Engineering and B.Sc. Degree in Civil Engineering from the University of Technology, Iraq. He has worked as a member of permanent staff (Assistant Lecturer) in University of Technology-Building and Construction Engineering Department. He participated in constructional design group (check and re-design), site supervision, and testing of construction materials. Teaching: engineering mechanics (statics), reinforced concrete design, theory of structures, concrete lab, material lab, and road lab. Research interests: Design of Reinforced Concrete Structures, and NDE technologies for the condition assessment of Structural Buildings including ultrasonic method.

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