Passive and Semi-active Control of Adjacent Buildings Using Friction dampers

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Ashoori, Morteza | 2013

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 45666 (09)
University: Sharif University of Technology
Department: Civil Engineering
Advisor(s): Bakhshi, Ali
Abstract:
In this thesis will investigate control performance of coupled buildings. Control of this structures will done using friction dampers based on passive and semi-active strategies.
A numerical study is employed to simulate a coupled building equipped with passive friction damper by using OpenSees software framework.
Semi-active friction damper is used on three groups of adjacent buildings. At first, a mathematical model of coupled buildings is established for each group. The variable friction dampers consist of an actuator, which is based on a piezoelectric stack that alters the normal force at the contact area. A clipping control algorithm considered in the numerical study for the variable friction damper to evaluate semi-active force. Clipping control is a class of controls that have a two-stage architecture. The first steps consist of designing an active control law and the second step involves the design of a clipping controller to clip the active control law to a semi-active one. A LQR controller is implemented in the first step.
Results and conclusions of this thesis have shown that semi-active control of coupled building is very usefull and effective while the passive control of them is not effective.
Keywords:
Friction Damper ; Passive Control ; Semiactive Control ; Adjacent Buildings

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