Stochastic Analysis of Long-Span Bridges with Active Control

  • P. Ghaemmaghami
  • J. N. Yang
Conference paper
Part of the Lecture Notes in Engineering book series (LNENG, volume 31)


The possible application of an active control system to long-span bridges subjected to random wind turbulences is explored. Servomechanisms and active tendons are utilized for the active control system, wherein the closed-loop feedback control algorithm is used. The wind load is separated into two parts; the self-excited loads and the buffeting loads. The self-excited wind load is dependent on the bridge motion, whereas, the buffeting wind load is modeled as a stationary stochastic process. The control problem is formulated in the frequency domain and the statistics of the bridge response and the control forces are obtained using the method of random vibration analysis. The stability of the bridge with or without an active control system is investigated. Both problems of single degree of freedom flutter and classical flutter are formulated. The effectiveness of the proposed active control system in suppressing the bridge response and enhancing its stability under strong wind gusts is demonstrated.


Control Force Bridge Deck Wind Load Torsional Mode Acceleration Sensor 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1987

Authors and Affiliations

  • P. Ghaemmaghami
    • 1
  • J. N. Yang
    • 1
  1. 1.Civil, Mechanical and Environmental EngineeringThe George Washington UniversityUSA

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