2026-09-19T02:40:22Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/345862022-01-13T07:54:23Zcom_1721.1_7582com_1721.1_7581col_1721.1_131023
Jerome J. Connor.
Shultz, Nicholas A. (Nicholas Andrew)
Massachusetts Institute of Technology. Dept. of Civil and Environmental Engineering.
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
2006-11-07T13:09:36Z
2006-11-07T13:09:36Z
2006
2006
http://hdl.handle.net/1721.1/34586
71250012
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2006.
Includes bibliographical references (leaves 55-57).
Traditional approaches to structural design presuppose strength to be the dominant design requirement. But following new technologies and design methods, this assumption that strength requirements dominate is being challenged. In the design of horizontal structures, such as floor systems and pedestrian bridges, increasing lengths of column-free span and demands for material efficiency have led to an overall reduction in the structural properties of mass, stiffness and damping. These three properties traditionally controlled motion-related serviceability issues, but this is no longer the case. Engineers are increasingly reporting vibration problems in horizontal structures. Hence, the dominant design criterion has shifted from a basis of strength to one of motion. This thesis attempts to investigate the code requirements and state of the art analysis techniques involved in the vibration control of horizontal structures. Design techniques involving passive control, active control and some alternative control methods are discussed and evaluated, both qualitatively and quantitatively, through a series of example problems.
(cont.) Conventional engineering knowledge addresses vibration problems by increasing stiffness; however, this study indicates that these problems may be resolved much more efficiently by increasing damping, perhaps through the use of a tuned mass damper. Recommendations are made, suggesting that structural engineers should give serious consideration to the dominance of serviceability issues in design. As vibration problems continue to become more prevalent with ever-increasing span lengths, the time will come when non-traditional solutions, such as the use of tuned mass dampers to control vibrations, can no longer be ignored.
by Nicholas A. Shultz.
M.Eng.
85 leaves
3797075 bytes
3800567 bytes
application/pdf
application/pdf
eng
Massachusetts Institute of Technology
M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.
http://dspace.mit.edu/handle/1721.1/7582
Civil and Environmental Engineering.
Motion control of long span horizontal structures
Thesis
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<Abstract>Traditional approaches to structural design presuppose strength to be the dominant design requirement. But following new technologies and design methods, this assumption that strength requirements dominate is being challenged. In the design of horizontal structures, such as floor systems and pedestrian bridges, increasing lengths of column-free span and demands for material efficiency have led to an overall reduction in the structural properties of mass, stiffness and damping. These three properties traditionally controlled motion-related serviceability issues, but this is no longer the case. Engineers are increasingly reporting vibration problems in horizontal structures. Hence, the dominant design criterion has shifted from a basis of strength to one of motion. This thesis attempts to investigate the code requirements and state of the art analysis techniques involved in the vibration control of horizontal structures. Design techniques involving passive control, active control and some alternative control methods are discussed and evaluated, both qualitatively and quantitatively, through a series of example problems.</Abstract>
<Abstract>(cont.) Conventional engineering knowledge addresses vibration problems by increasing stiffness; however, this study indicates that these problems may be resolved much more efficiently by increasing damping, perhaps through the use of a tuned mass damper. Recommendations are made, suggesting that structural engineers should give serious consideration to the dominance of serviceability issues in design. As vibration problems continue to become more prevalent with ever-increasing span lengths, the time will come when non-traditional solutions, such as the use of tuned mass dampers to control vibrations, can no longer be ignored.</Abstract>
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