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Experimental Evaluation of Dynamic Effects for a Selected Highway Bridge
Authors:Leslaw Kwasniewski  Jerry Wekezer  Garry Roufa  Hongyi Li  Jean Ducher  Jerzy Malachowski
Affiliation:1Associate Professor, Institute of Structural Mechanics, Warsaw Univ. of Technology, Armii Ludowej 16, 00-637 Warszawa, Poland. E-mail: l.kwasniewski@il.pw.edu.pl
2Professor, FAMU-FSU College of Engineering, Dept. of Civil and Environmental Engineering, 2525 Pottsdamer St., Tallahassee, FL 32310. E-mail: wekezer@eng.fsu.edu
3Senior Structural Research Engineer, Structural Research Center, Florida Dept. of Transportation, 2007 E. Dirac Dr., Tallahassee, FL 32310. E-mail: garry.roufa@dot.state.fl.us
4Ph.D. Candidate, FAMU-FSU College of Engineering, Dept. of Civil and Environmental Engineering, 2525 Pottsdamer St., Tallahassee, FL 32310. E-mail: lihongy@eng.fsu.edu
5State Bridge Evaluation Engineer, Structures Maintenance Section, Florida Dept. of Transportation, 605 Suwannee St., Tallahassee, FL 32399. E-mail: jean.ducher@dot.state.fl.us
6Assistant Professor, School of Mechanics, Military Univ. of Technology, 2 Kaliskiego St., 00-908 Warsaw, Poland. E-mail: malachow@wme.wat.edu.pl
Abstract:The paper presents an experimental study of the actual dynamic effects for a preselected typical highway bridge. Knowledge of the dynamic impact factors is important for accurate determination of the ultimate load capacity and performance assessment of constructed bridges. Static and dynamic field tests were performed on a two-lane concrete highway bridge built in 1999 on U.S. 90 in northwest Florida. During the tests, one or two fully loaded trucks crossed over the bridge, which was instrumented with strain gauges, accelerometers, and displacement transducers. A wooden plank was placed across the lanes for some runs to trigger extensive dynamic vibration and to simulate poor road surface conditions. Data collected from the tests were used for comprehensive assessment of the bridge under dynamic loading. Impact factors obtained from the tests with higher speeds were found larger than corresponding values recommended by bridge codes. Analysis revealed that stiff vehicle suspension, road surface imperfection, and “bouncing” of the truck loading contributed to the high impact factors. Experimental data were also used for validation of the finite-element models developed for the vehicle–bridge system.
Keywords:Bridges  highway  Dynamic tests  Impact loads  Finite element method  Vehicles  Bridge construction  Florida  
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