| Author | Tantry, Harishchandra Prabhakar |
| Call Number | AIT Thesis no. ST-89-18 |
| Subject(s) | Tall buildings--Vibration
|
| Note | A thesis submitted in partial fulfillment of the requirements for
the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | Tall buildings generally exhibit poor damping characteristics. A tuned
mass damper (TMD) is one of the promising alternatives for increasing the
damping, and thus reducing the dynamic response of the building. In this
study the forty-four storey Baiyoke Tower building in Bangkok is used to
investigate the effectiveness of TMDs in suppressing the dynamic response
due to ground excitations. The building is modelled as a uniform
cantilever fixed at the base and with the mass concentrated at the floor
levels. Soil-structure interaction effects are disregarded. A TMD tuned
to the first mode and attached at the top of the cantilever building is
investigated for different tuning parameters. A significant reduction in
the dynamic response can be achieved by an optimum tuned nm. Alternative
damping systems and their efficiency in energy dissipation are
investigated by analysing the dynamic response of the first mode of
vibration of the structure, using the concept of generalised coordinates.
By attaching a TMD to the generalised single-degree-of-freedom building,
a two-degree-of-freedom oscillator results. The dynamic response obtained
from this simplified structural model is quite accurate for
well-separated eigenfrequencies of the building. The feasibility of
providing friction dampers is studied and the use of a nonlinear viscous
damper for the nm is investigated. All dynamic analyses have been
carried out by the computer program ANSYS. The results show that the
alternative damping systems considered in this study do not reduce the
resonance response of a building as compared with a conventional TMD.
However, by the installation of friction dampers, the relative movement
of the TMD can be significantly reduced. |
| Year | 1989 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Wireland, Martin
|
| Examination Committee(s) | Worsak Kanok -Nukulchai ;Gupta, Satyendra P. ;Jain, Sudhir K.
|
| Scholarship Donor(s) | Government of Norway (NORAD) |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1989 |