Effect of tuned mass dampers on the dynamic response of Rama IX cable-stayed bridge under earthquake actions | |
| Author | Kasa, Hirofum |
| Call Number | AIT Thesis no.ST-88-11 |
| Subject(s) | Rama IX cable-stayed bridge Bridges, Cable-stayed |
| 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 | The earthquake behavior of Rama IX cable-stayed bridge in Bangkok, which is equipped with tuned mass dampers for suppressing wind-induced vibrations in the deck and towers, is investigated. Since the soil foundation in Bangkok consists of very soft alluvial layers, severe vibrations may be caused in the bridge due to local soil amplifications similar to Mexico City during the two earthquakes in September 1985. The bridge is modelled as a plane-frame system subjected to the horizontal and vertical components of the earthquake ground motion of three different types of earthquakes, with greatly varying predominant periods of vibration. The effect of a tuned mass damper, located at the mid-span and tuned to the first flexural mode, on the earthquake response of the bridge is investigated , assuming small-amplitude oscillations. Results of time and frequency domain analyses show, that the effectiveness of a tuned mass damper is confirmed for the earthquake ground excitation with a long pre dominant period o f about 2 seconds, which can be anticipated in Bangkok. However, a tuned mass damper is not effective for suppressing all seismic-induced vibrations. It is also observed that cable vibrations with large amplitudes are caused in some cases, and a tuned mass damper in the bridge deck is useless for suppressing cable vibrations. |
| Year | 1988 |
| 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) | Sritawat Kitipornchai ;Hasegawa Akio |
| Scholarship Donor(s) | The Royal Thai Government |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1988 |