Active Control of Cable-Stayed Bridges (original) (raw)

Springer eBooks, 1999

Abstract

In this work we propose the design of an automatic control system for a cablestayed bridge to actively counteract external environmental forces generated by earthquakes. The introduction of this intelligent feature in the structure turns an otherwise passive bridge into a smart bridge, capable of reducing the amplitude of the deflections of its deck down to a desired level automatically. The control strategy proposed here uses a subset of the stay cables as active tendons to provide control forces through appropriate actuators. Each individual actuator is controlled by a decentralized controller that uses local linear velocity and local linear relative displacement information only. The effectiveness of the control algorithm herein proposed is tested on a three-dimensional model of the Quincy Bayview bridge [1,2]. This bridge has been chosen because it is fairly representative of the new generation of cable-stayed bridges. The mathematical model is derived using a finite element approach. Although some work has been done in this field by other researchers [3–6], to our knowledge, no results that use three-dimensional full-scale models have been published in the literature.

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