Bridge Analysis, Design and Repair

Single Abstract

342919 - Finite element model updating of a riveted steel railway bridge via operational modal analysis and Genetic Algorithm

Friday, April 20
3:30 PM - 5:00 PM
Location: 203A

In this work the results of a full-scale ambient vibration test, operational modal analysis and finite element model updating of a typical riveted steel railway bridge are presented. A multiple setup test was conducted in different spans of the bridge using twelve uniaxial piezoelectric accelerometers. The bridge segment being investigated in the current study is a steel double-track riveted through truss of a span length 146.75 ft. and a transverse width of 30.5 ft. The structural system of the bridge contains riveted members. Eyebars are employed in the main trusses as interior bottom chords and diagonal members.
The modal parameters of the bridge were estimated using Stochastic Subspace Identification techniques on the unloaded structure. An initial three dimensional finite element (FE) model of the bridge was developed in SAP2000 and linked with MATLAB through the SAP2000 OAPI programming interface to facilitate the application of Genetic Algorithm for updating the model. The procedure is based on utilizing identified modal parameters from field measurements to update parameter values of importance (e.g. material properties and semi-hinged connection parameters) in the FE model. To facilitate development of the updating procedure, a number of classes of moment-rotation models for riveted and support connections were studied. The identified modal parameters and updating results were analyzed and are discussed in detail.

Ahmed Rageh

PHD Student
University of Nebraska-Lincoln

PHD Student, University of Nebraska-Lincoln


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Garrett P. Martindale

Graduate Research Assistant
University of Nebraska Lincoln

Second Year Master's Student


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Richard L. Wood

Assistant Professor
University of Nebraska-Lincoln

Dr. Richard L. Wood has been an Assistant Professor in the Department of Civil Engineering at the University of Nebraska-Lincoln since 2013, after completing a postdoctoral research fellowship at the University of California, San Diego. He received his B.S. (2006) in Civil Engineering with a concentration in Structures from Clarkson University in Potsdam, NY, and his M.S. (2009) and Ph.D. (2012) in Structural Engineering from UC San Diego in La Jolla, CA. His research interests include remote sensing and nondestructive assessment of various structures and civil infrastructure networks, along with structural dynamics and the response of structures under extreme loads.


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Saeed Eftekhar Azam

Postdoctoral Research Associate
University of Nebraska-Lincoln

Ph.D. Politecnico di Milano


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Daniel Linzell

Voelte-Keegan Professor and Chair
University of Nebraska-Lincoln

Dr. Daniel G. Linzell, P.E., F.ASCE, is the Voelte-Keegan Professor and Chair of the Department of Civil Engineering at the University of Nebraska-Lincoln. From 1999 until June of 2013, he was a faculty member in the Department of Civil and Environmental Engineering at the Pennsylvania State University, most recently serving as the John A. and Harriette K. Shaw Professor of Civil Engineering and Director of the Protective Technology Center. He received his Ph.D. from the Georgia Institute of Technology in 1999, his M.S. in Civil Engineering from Georgia Tech in 1995 and a B.S. in Civil Engineering from Ohio State University in 1990. He served as a visiting professor at the University of Navarra in San Sebastian, Spain, during the 2008-09 academic year. Dr. Linzell has published nearly 60 peer-reviewed, journal articles that have focused on: monitoring and predicting the behavior of bridges during construction and under service loads; protective barrier systems; building and bridge systems and components under blast and impact; and ship structural component performance. Prior to receiving his Ph.D., Dr. Linzell was employed by Burgess and Niple, Ltd. in Columbus Ohio where he performed condition and forensic structural inspections and rehabilitation designs. He currently sits on the Structural Stability Council’s Executive Committee, is a Member of the Transportation Research Board’s Steel Bridge Committee and of the American Society of Civil Engineer’s Composite Construction and Bridge and Tunnel Security Committees. He is a licensed Professional Engineer.


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342919 - Finite element model updating of a riveted steel railway bridge via operational modal analysis and Genetic Algorithm

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