Brady, Sean P.

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Brady, Sean P.
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Brady, Sean P.

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  • Publication
    The effect of vehicle velocity on the dynamic amplification of a vehicle crossing a simply supported bridge
    (American Society of Civil Engineering (ASCE), 2006-03)
    Brady, Sean P. 
    ;
    O'Brien, Eugene J. 
    ;
    Znidaric, Ales 
    Many authors, using both experimental tests and complex numerical models, have examined the effect of vehicle velocity on a highway bridge’s dynamic amplification. Although these tests and models give valuable quantitative information on dynamic amplification, they give little insight into how amplification is affected by individual vehicle/bridge parameters. This paper uses relatively simple numerical models to investigate the effect of vehicle velocity on a bridge’s dynamic amplification. A single vehicle crossing a simply supported bridge is modeled as a constant point force. A set of critical velocities are determined associated with peaks of dynamic amplification for all beams. The reasons for these large amplifications are discussed. A more complex finite element model, validated with field tests, is used to test the applicability of the conclusions obtained from the simple models to a realistic bridge/vehicle system.
      3472Scopus© Citations 88
  • Publication
    The effect of vehicle velocity on the dynamic amplification of two vehicles crossing a simply supported bridge
    (American Society of Civil Engineering (ASCE), 2006-03)
    Brady, Sean P. 
    ;
    O'Brien, Eugene J. 
    The effect of multiple vehicles on a bridge’s dynamic amplification is a complex problem. Previously authors have examined multiple vehicle presence by constructing elaborate finite element models or undertaking field tests. Although both these methods give valuable information regarding the magnitude of dynamic amplification, the results tend to be site-specific and give limited insight into how large amplifications occur. This paper examines the dynamic amplification factor of a simply supported bridge being crossed by two loads traveling in both the same and opposing directions. Simple numerical point load models are used to determine the critical load velocities and load positions that result in high amplifications. An experimentally validated finite element model is used to examine the applicability of the conclusions to real bridge/vehicle systems.
      1027Scopus© Citations 38