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Related Experiment Videos

Semi-active control of a cable-stayed bridge under multiple-support excitations.

Ze-Bing Dai1, Jin-Zhi Huang, Hong-Xia Wang

  • 1School of Civil Engineering and Mechanics, Shanghai Jiaotong University, Shanghai 200240, China. zbdaicn@163.com

Journal of Zhejiang University. Science
|January 17, 2004
PubMed
Summary

This study introduces a semi-active seismic protection strategy using Magnetorheological (MR) dampers for cable-stayed bridges. The method effectively controls bridges under multiple-support seismic excitations, matching active control performance.

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Area of Science:

  • Civil Engineering
  • Structural Engineering
  • Earthquake Engineering

Background:

  • Cable-stayed bridges are vulnerable to seismic events, especially with multiple-support excitations.
  • Existing active control strategies perform well under uniform seismic motion but require further investigation for varied excitations.
  • Magnetorhegetological (MR) dampers offer controllable energy dissipation for structural protection.

Purpose of the Study:

  • To propose and evaluate a semi-active seismic control strategy for a benchmark cable-stayed bridge subjected to multiple-support excitations.
  • To compare the effectiveness of the proposed semi-active control strategy with a previously established active control strategy.
  • To ensure the fail-safe stability of the controlled structure.

Main Methods:

Related Experiment Videos

  • Implementation of Magnetorheological (MR) dampers as control devices.
  • Application of a LQG-clipped-optimal control algorithm for the semi-active strategy.
  • Comparative analysis with an active control strategy under multiple-support seismic excitations.

Main Results:

  • The semi-active control strategy demonstrated performance nearly equivalent to the active control system.
  • MR dampers proved effective in controlling cable-stayed bridges subjected to multiple-support seismic excitations.
  • The proposed semi-active strategy guarantees bounded-input, bounded-output stability.

Conclusions:

  • Semi-active control using MR dampers is a viable and effective strategy for seismic protection of cable-stayed bridges.
  • The proposed strategy offers a fail-safe solution comparable in performance to active control systems.
  • MR dampers are well-suited for mitigating seismic responses in cable-stayed bridges under complex excitation scenarios.