Response of submerged spherical structures to earthquake motions | |
| Author | David Srimahachota |
| Call Number | AIT Diss. no.D12 |
| Subject(s) | Structural dynamics Earthquakes and building Earthquakes and hydraulic structures |
| Note | A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Engineering of the Asian Institute of Technology, Bangkok, Thailand. |
| Publisher | Asian Institute of Technology |
| Abstract | The dynamic response of single degree of freedom and multi-degree of freedom spherical structures submerged in a viscous fluid of infinite extent, initially at rest, is investigated. The equation of motion includes the expression for fluid reaction derived by Basset. The equations are solved numerically by linear acceleration method. Time history responses of a single degree of freedom system and response spectrum curves for the N-S component of structural damping, density ratio and Stokes number. For the submerged multi-degree of freedom system, the responses are studied in the form of time history curves generated for different parameters. A model analysis is derived for the case, the only possible case, where all the spheres have the same size and density and the damping co-efficient is proportional to the mass. The response spectra generated previously are used to predict the maximum displacements of the multi-degree of freedom systems and the results are validated by comparing with those obtained from direct numerical integration. Finally, the elastic-plastic single degree of freedom system subjected to the E1 Centro earthquake is studied. The response spectra for the elastic perfectly plastic system are generated for different values of density ratio and ductility factor. The results show that there exists and option value of the yield displacement at which the maximum displacement response of the system is minimum. For the range of parameters considered in this study for civil engineering purposes, the lateral forces in both the elastic and the elastic perfectly plastic systems submerged in fluid are in general larger than those acting on the structure vibrating in a vacuum. |
| Year | 1975 |
| Type | Dissertation |
| School | AIT Publication (Year <=1978) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Dissertation (D) (Year <=1978) |
| Chairperson(s) | Seng-Lip Lee |
| Examination Committee(s) | Tongchat Hongladaromp |
| Degree | Thesis (Ph.D.) - Asian Institute of Technology, 1975 |