S3 2025 Program Highlights

Technical Program

Keynote Speaker

Monitoring the Performance of Geotechnical Structures Using Sensor Arrays

Dante Fratta, Ph.D., P.E.
University of Wisconsin-Madison

Ensuring the performance and safety of geotechnical structures increasingly relies on continuous, data-driven monitoring. Advances in sensor array technologies—from conventional instrumentation (e.g., Shape Arrays, Time Domain Reflectometry) to distributed fiber-optic systems (e.g., Distributed Temperature Sensing and Distributed Acoustic Sensing)—now enable high-resolution, real-time assessment of deformation, strain, scour, dynamic responses, system degradation, and material properties. This presentation reviews...

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Invited Speaker

Creep and Stress Relaxation of 150 ksi Threaded Bars

Pete Speier, P.E.
Williams Form Engineering Corp

It is not widely known that ASTM A722 is a process specification that requires bars to be cold stressed to 80% of the specified minimum tensile strength and then stress relieved. This process produces a bar with properties that can be important to prestresssing applications. However, ASTM A722 includes bar sizes up to and including 3” diameter and currently no steel producers in the USA have the capability to cold stress and stress relieve bars larger than 1-3/4” diameter. Therefore, most domestic suppliers have been manufacturing these bars for many years...

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