Simplified analysis of building-foundation systems | |
| Author | Lumantarna, Benjamin |
| Call Number | AIT Thesis no. 808 |
| Subject(s) | Structural engineering Foundations Building |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering of the Asian Institute of Technology, Bangkok, Thailand. |
| Publisher | Asian Institute of Technology |
| Abstract | In this study the classical transformation which uncouples the equations of motion of the system with classical normal modes is applied to a building-foundation system which does not admit such modes. The transformed equations of motion are still coupled as the damping matrix is not diagonalized. The equations are completely uncoupled in the proposed method by neglecting the off diagonal terms of this matrix. The proposed method, found to be accurate for highs values of the shear wave velocity of the foundation medium, facilitates the study of the number of normal modes required in the calculation of the seismic response of the system, and shows that only the first few modes are required to obtain the results with sufficient accuracy for practical purposes. The computing time by the proposed method is much less than the numerical method of solving the equations of motion directly. The building foundation system is .subjected to the N-S component of El Centro earth quake and the least favorable excitation. Comparing the responses due to the least favorable excitation and the real one, a safety factor of the order of three is obtained for the five-story building and five for ten and fifteen-story buildings. This indicates that the least favorable excitation method is too conservative and impractical. |
| Year | 1975 |
| Type | Thesis |
| School | Student Research Before 1980 |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Thesis (Year <=1979) |
| Chairperson(s) | Karasudhi, Pisidhi ; Lee, Seng-Lip |
| Scholarship Donor(s) | PETRA Christian University, Surabaya, Indonesia |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 1975 |