Title page for ETD etd-10042003-231150


Type of Document Master's Thesis
Author Ritchey, John Kenneth
URN etd-10042003-231150
Title Application of Magneto-Rheological Dampers in Tuned Mass Dampers for Floor Vibration Control
Degree Master of Science
Department Civil Engineering
Advisory Committee
Advisor Name Title
Murray, Thomas M. Committee Co-Chair
Setareh, Mehdi Committee Co-Chair
Ahmadian, Mehdi Committee Member
Wicks, Alfred L. Committee Member
Keywords
  • tuned mass damper
  • floor vibration
  • semi-active
Date of Defense 2003-10-02
Availability unrestricted
Abstract

The purpose of this research is to establish the effectiveness of tuned-mass-dampers (TMD) using semi-active magneto-rheological (MR) dampers to mitigate annoying floor vibrations. Annoying floor vibration is becoming more common in today's building structures since building materials have become stronger and lighter; the advent of computers has resulted in "paperless" offices; and the use of floors for rhythmic activities, such as aerobics and concerts, is more common. Analytical and experimental studies were conducted to provide an understanding of the effects of incorporating the semi-active-TMD as a remedy to annoying floor vibration.

A pendulum tuned mass damper (PTMD) in which the tuning parameters could independently be varied was used. Closed form solutions for the response of the floor using passive dampers were developed. In addition, a numerical integration technique was used to solve the equations of motion where semi-active dampers are utilized. The optimum design parameters of PTMDs using passive and semi-active dampers were found using an optimization routine. Performances of the PTMD in reducing the floor vibration level at the optimum and when subjected to off-tuning of design parameters using passive and semi-active dampers were compared.

To validate the results obtained in the analytical investigation, an experimental study was conducted using an 8 ft x 30 ft laboratory floor and a commercial PTMD. Comparative studies of the effectiveness of the PTMD in reducing floor vibrations using semi-active and passive dampers were conducted.

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