Dynamic characteristics of bridges with a base-isolation system | |
| Author | Tay, Key-siang |
| Call Number | AIT Thesis no. ST-93-27 |
| Subject(s) | Structural dynamics Bridges |
| 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 | To date, there are several hundred bridges in the world to which seismic isolation principles have been applied. And it is expected that bridge with base isolation system will be widely accepted in the countries where earthquake occurs frequently. Under these situations a base isolation system composed of Teflon sliding bearing and rubber device for bridge has been newly proposed and its dynamic characteristics has been discussed base on experimental results. The main objectives of this study are to understand the dynamic characteristics of bridge with newly proposed base isolation system using analytical technique and to investigate the effectiveness of isolation bridge. In order to achieve the objectives aforementioned, an analytical technique to simulate the dynamic characteristics of the experimental results is used. Five different earthquake records and two artificial motions are applied to investigate the peiformance of isolation system. The influences of friction coefficient of Teflon bearings, damping ratio of pier and stiffness of pier on the isolation bridge are also studied in this paper. It has been revealed that the isolation system is very effective for long predominant period and large amplitude input motion. It can reduced 50% to 60% of the maximum shear force of pier. However, it is less effective to short predominant period and low amplitude input motion, since the system can reduced only 10% of the maximum shear force of pier. The results also show that the system is not sensitive to the frequency content of earthquake record and free from resonance vibration. Furthe1more, from the Fourier Amplitude Spectrum analysis it is found that base-isolation bridge model shows a superior capability of energy dissipation. |
| Year | 1993 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Sugiyama, Toshiyuki |
| Examination Committee(s) | Pennung Warnitchai ;Worsak Kanok-Nukulchai ; |
| Scholarship Donor(s) | German Academic Exchange Service (D.A.A.D.); |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1993 |