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Earthquakes and Structures
  Volume 15, Number 3, September 2018, pages 227-241

Seismic protection of the benchmark highway bridge with passive hybrid control system
Arijit Saha, Purnachandra Saha and Sanjaya Kumar Patro

    The present paper deals with the optimum performance of the passive hybrid control system for the benchmark highway bridge under the six earthquakes ground motion. The investigation is carried out on a simplified finite element model of the 91/5 highway overcrossing located in Southern California. A viscous fluid damper (known as VFD) or non-linear fluid viscous spring damper has been used as a passive supplement device associated with polynomial friction pendulum isolator (known as PFPI) to form a passive hybrid control system. A parametric study is considered to find out the optimum parameters of the PFPI system for the optimal response of the bridge. The effect of the velocity exponent of the VFD and non-linear FV spring damper on the response of the bridge is carried out by considering different values of velocity exponent. Further, the influences of damping coefficient and vibration period of the dampers are also examined on the response of the bridge. To study the effectiveness of the passive hybrid system on the response of the isolated bridge, it is compared with the corresponding PFPI isolated bridges. The investigation showed that passive supplement damper such as VFD or non-linear FV spring damper associated with PFPI system is significantly reducing the seismic response of the benchmark highway bridge. Further, it is also observed that non-linear FV spring damper hybrid system is a more promising strategy in reducing the response of the bridge compared to the VFD associated hybrid system.
Key Words
    benchmark highway bridge; polynomial friction pendulum isolator; fluid viscous damper; non-linear FV spring damper; hybrid control; SIMULINK; evaluation criteria
Arijit Saha, Purnachandra Saha: School of Civil Engineering, KIIT University, Odisha, India
Sanjaya Kumar Patro: Department of Civil Engineering, Veer Surendra Sai University of Technology, Odisha, India

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