Experimental study of the wind effects on transmission systems via aeroelastic testing

December 7, 2022 | 1:00pm - 2:00pm CT

About the Webinar

The electric power transmission infrastructure in the United States, especially in coastal areas, faces substantial risk from hurricanes. When exposed to strong winds, demands in various elements in transmission tower-line systems may exceed corresponding capacities and trigger various modes of failure. Enhancing the resilience of the transmission grid against increasing threats from hurricanes and strong winds is therefore of critical importance.

In this project, a set of 1:50 scale aeroelastic models of a self-supported steel lattice tower and a multi-span transmission line system were subjected to simulated hurricane winds. These tests were conducted in three phases: Phase 1 related to tests on a self-supported single tower without insulators. Phase 2 included tests on three towers with conductors. In phase 3, the rupture of conductors in a system with three towers was tested. The multi-span system considered in this project consisted of three lattice towers, four spans of conductors, and two end-frames. The aeroelastic tests were conducted at the NSF NHERI Wall of Wind Experimental Facility (WOW EF) at the Florida International University (FIU). The standalone tower and multi-span systems were tested at various wind speeds ranging from 35 m/s to 78 m/s (equivalent full-scale speeds) for varying wind directions. The recorded responses including measurements from accelerometers, strain gauges, and load cells as well as the time history of applied wind during the tests were presented as a dataset. A number of studies were carried out using this dataset. For example, a system identification (SID) technique was used to evaluate experiment-based along-wind aerodynamic damping coefficients and compare them with their empirical counterparts. Moreover, the drag coefficients and gust response factors of the standalone transmission tower were estimated using wind tunnel experiments and a Kalman filtering method.

This talk will present the motivation and an overview of the aeroelastic wind experiments. The data curation process and opportunities for data reuse will be discussed in the talk. Moreover, ongoing works and major findings of a few studies on hurricane performance assessment of transmission systems employing this dataset will be presented.


Ziad Azzi began his career as an Adjunct Professor in the Department of Civil Engineering at the Lebanese American University in Beirut, Lebanon. At the same time, Ziad was pursuing an MS in Civil Engineering with an emphasis on Earthquake Engineering and Engineering Mechanics while also working part-time as a structural engineer with CCL Engineering International. In 2016, Ziad moved to the USA to pursue a second MS and a Ph.D. in Civil Engineering at Florida International University with an emphasis on Wind Engineering and Building Enclosure. Ziad worked for 5 years as a research scientist at the NSF NHERI Wall of Wind (WOW), affiliated with the International Hurricane Research Center (IHRC). Currently, Ziad is an Adjunct Professor at FIU. In 2021, Ziad joined DDA Claims Management as the Principal Forensic Engineer.

Ashkan B. Jeddi received a B.Sc. degree in Civil Engineering from the Iran University of Science and Technology, Tehran, Iran, in 2015., and an M.Sc. in Structural Engineering from Sharif University of Technology, Tehran, Iran, in 2017. He joined the Risk Assessment and Management of Structural and Infrastructure Systems (RAMSIS) lab in 2019 and is currently a Graduate Research Associate at the department of Civil, Environmental and Geodetic Engineering, The Ohio State University, Columbus, OH, USA. His primary research interests include development of artificial intelligence and machine learning techniques for performance analysis, risk assessment, and resilience-informed management of structural and infrastructure systems.

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