Simplified method for earthquake analysis of rockfill dams | |
| Author | Sera, Erano E. |
| Call Number | AIT Thesis no. ST-88-23 |
| Subject(s) | Rockfill dams Dams--Earthquake effects |
| 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 | A simplified method for the seismic analysis of rockfill dams is investigated. The method is based on a modal analysis by including only the first few modes of vibration; and the contribution from the higher modes is treated to be of quasi-static nature. The results of the simplified method are compared with the exact response of the dam which is determined using the equivalent-linear method to account for soil nonlinearity . As a case study the proposed Conwap Dam, a major part of the Casecnan Transbasin Diversion Project of the Philippines, is analyzed. Conwap Dam is a central-cored rockfill dam with a maximum height of 204 m, an earth volume of 31x106 m3, and a reservoir of 1.103x109 rn3 . A design earthquake with magnitude 6. 9, and a peak ground acceleration of 0 .382 g are considered. For the time history analysis an artificial spectrum- compatible accelerogram is employed . The dam is modelled as a plane strain system attached to the rigid foundation and only the horizontal earthquake component is considered. Results from the modal analyses with and without the quasi- static correction of the higher modes show that simple mode superposition gives more accurate results than that with quasi-static improvements . It is also found that a modal analysis with a single mode of vibration can be applied accurately except for nodes close to the base. |
| 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 ; Kuwano, Jiro |
| Scholarship Donor(s) | Australian Government |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1988 |