Doctoral Dissertations

Author

Yuxiang Xin

Abstract

"A conventional tuned liquid damper (TLD) generates a relatively small control force associated with low density of sloshing water. To overcome this main drawback, proposed in this study is a new TLD system composed of water and fine particles in a rectangular tank of sloping bottom. When subjected to a weak base excitation, the fine particles inside the rectangular tank remain at the bottom of the tank, and the water above the particles sloshes with a free surface. As the base excitation increases, the fine particles appear in a fluidized state due to increased pore pressure between particles; the particles and the water in the tank are then mixed and sloshing together, this increasing the mass of sloshing body. The new TLD system has larger effective mass, stronger adaptability to external excitations, larger control force, and more flexible geometry design. In this study, the behavior and response of water sloshing, single particle, single layer of particles and multiple layers of particles were investigated both experimentally and numerically. Image analysis was performed to determine the wave height of sloshing motion, the displacement, velocity and acceleration of particles from experimental data. A multiple virtual flat-bottom tanks model was proposed to evaluate the motion of particles and water sloshing in a rectangular tank. It was experimentally proven sufficiently accurate for engineering applications. The effectiveness of the proposed mass-variable TLD system is validated with extensive shake table tests. It was concluded that the motion of a particle can be simulated with sufficient accuracy under weak excitations as long as the linear wave theory is applicable. In comparison with a conventional TLD, the mass-variable TLD can effectively reduce the structural response, especially under large external excitations."--Abstract, page iii.

Advisor(s)

Chen, Genda

Committee Member(s)

Cheng, Franklin Y.
LaBoube, Roger A.
Belarbi, Abdeldjelil
Mendoza, Cesar
Agarwal, Sanjeev, 1971-

Department(s)

Civil, Architectural and Environmental Engineering

Degree Name

Ph. D. in Civil Engineering

Comments

Financial supports to complete this study were provided in part by the National Science Foundation under Award No. CMS0342020 and by the Dean’s Fellowship Program at UMR.

Publisher

University of Missouri--Rolla

Publication Date

Summer 2006

Pagination

xiv, 183 pages

Note about bibliography

Includes bibliographical references (pages 176-182).

Rights

© 2006 Yuxiang Xin, All rights reserved.

Document Type

Dissertation - Restricted Access

File Type

text

Language

English

Subject Headings

Buildings -- Vibration
Seismic waves -- Damping

Thesis Number

T 9016

Print OCLC #

168446945

Link to Catalog Record

Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.

http://merlin.lib.umsystem.edu/record=b5946872~S5

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