| Author | Malla, Sujan |
| Call Number | AIT Thesis no. ST-88-16 |
| Subject(s) | 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 stochastic response and reliability of the cable system of a
cable-stayed bridge under earthquake loading is studied. A linear-elastic
dynamic analysis has been carried out by modelling the bridge as a
two-dimensional frame system. As a case study, the Karnali cable-stayed
bridge in western Nepal is investigated.
From the historical earthquake data of Nepal, the statistics of
earthquake magnitude and epicentral distance are estimated for the region
of the bridge site. The power spectra of stress in the stay cables are
computed using the Kanai-Tajimi model for the earthquake process. The
standard deviation and the relevant moments of the response power spectrum
are calculated numerically and the probability of first-passage of stress
across a specified barrier is computed.
Based on the conditional probability of barrier crossing for given
values of magnitude and epicentral distance and the corresponding
probability distributions, the probability of exceeding a barrier during
one event is found. Assuming that the average number of earthquakes per
year in the magnitude range of interest in the source zone is constant,
the first-passage probability for any desired period of earthquake
exposure can be determined.
Finally, the probability of failure of one cable or a group of cables
simultaneously is computed from the probabilities of first-passage
failure of individual cables. The fatigue damage to the cables due to
seismic action has also been investigated. In addition, the problem of
cable vibrations is studied. |
| 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) | Hasegawa Akio ;Gupta, Satyendra P. ;Sritawat Kitipornchai |
| Scholarship Donor(s) | DAAD (West Germany) |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1988 |