ASCE SJ March 2019 Meeting -Game Changer-How Objective Measurements Quantify A Structure's Capacity
"Game Changer - How Objective Measurements Quantify A Structure's Capacity"
Thomas Winant, PE and Dr. Alan Jeary
STRAAM Group, 19th Floor, 40 Wall Street, Manhattan.
Recent improvements in technology combined with assessment techniques developed over 40 years have made it practicable to measure the response of structures to everyday random excitation and thereby to assess the structure itself. This assessment of the structure yields information about the behavior of the structure compared with what codes of practice envisaged. This comparison leads directly to a measure of the capacity of the structure to withstand forces that would take the response outside the elastic range, and thereby initiate damage.
This represents a real measure of the serviceability of the structure.
Using accelerometers that are extremely sensitive, it is possible to use excitation from natural sources (such as wind or traffic) to obtain information about the in-service performance of the structure, from an analysis of tiny movements in a process that is analogous to the use of an electrocardiogram to judge the state of health of a human. The measured tiny movements reflect the behavior of the structure throughout the elastic range and because the elastic modulus (to a good approximation) is linear in this range, then extrapolation, even up to very large motion, can be performed and can give a direct measure of the capacity of the structure, as well as the presence of any anomalies and their location.
The techniques and analysis have been used in buildings in the USA, Australia and New Zealand to support decisions about the viability use, and even whether construction work is safe to continue.
ASCE Member $35
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March 13, 2019 - ASCE SJ Branch YMF St. Patty's Day Happy Hour & Trivia at PJ Whelihan's, Maple Shade, NJ.
April 16, 2019 -ASCE SJ Branch YMF Annual Phillies Game and Tailgate at Citizen's Bank Park, Philadelphia, PA.
To register, please click the link below.
We hope to see you there!
Scott D. Batterman