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| DC Field | Value | Language |
|---|---|---|
| dc.contributor.advisor | Siti Aminah bt Othman, Assoc. Prof. Dr. | |
| dc.contributor.author | Gareane A. I. Algreane (P38312) | |
| dc.date.accessioned | 2023-10-11T02:31:28Z | - |
| dc.date.available | 2023-10-11T02:31:28Z | - |
| dc.date.issued | 2013-05-31 | |
| dc.identifier.other | ukmvital:74760 | |
| dc.identifier.uri | https://ptsldigital.ukm.my/jspui/handle/123456789/487261 | - |
| dc.description | Elevated tanks are lifeline structures because their functions are essential to remain functional in post-earthquake periods. These critical water storage and distribution facilities should be capable of surviving a major seismic event or sustaining only major damage that can readily be repaired. These facilities are needed to provide water for fire fighting, human consumption and sanitation. The irregular shape of the elevated tanks for which most of the mass confluent in the upper part of the tank makes it more sensitive to any dynamic load. Lack of real input seismic excitations at site, an artificial seismic excitation has been generated at bed rock based on Gasparini and Vanmarcke through SIMQKE software. The ground motion and response spectrum have been obtained based on one-dimensional nonlinear analysis site effects through software named as NERA. In this study circular and rectangular elevated water tanks have been chosen to conduct this study through two ways that widely used in the analysis of elevated tanks namely mechanical models and finite element models (FEM). In the case of mechanical models the study examined through software developed by authors the applicability of using these approaches, started from single degree of freedom (SDOF) idealization with and without soil structure interactions (SSI) effects. Also two degrees of freedom (2DOF) in which the fluid structure interactions (FSI) are considered according to Eurocode-8 (EC-8) also with and without SSI. Substructure approach has been adopted to assess the SSI effects in all mechanical models. The results of cases motioned before have been compared with FEM models implemented through LUSAS FEA 14.03 also in the cases with and without SSI effects. Added mass approach (Westergaard) has been used to account FSI in FEM models. The results of period of convective mode ( ), period of impulsive mode ( ) and level of forces (overturning moment and shear force) that created by using this approach is compared with FEM results. The results shows that simplified procedure that can be utilized for evaluating the dynamic characteristics and the dynamic response of elevated concrete water tank is adequate by using 2DOF, and inapplicable in the case of SDOF. Passed on the complexity implementation of Westergaard added masses approach, the authors suggested a modification to simplify Westergaard approach by making an alternative masses distribution to and compare it with Westergaard method every case. The results show that minor effects due to the masses distribution are obtained. The circular tank has been chosen to study the linear and nonlinear seismic effects of the whole system (soil, foundation and tank), considering SSI (direct approach) and FSI based on integration dynamic analysis. The effects of state stresses in soil before and after the tank constructed have been studied extensively. The seismic load have been applied at two critical direction in which overturning moment and shear force are maximum, under two integration scheme named Newmark and Helber Hugi Tylor (HHT). The results show that the integration scheme and considering the state of stresses at soil does not affects the results significantly. All of the cases that mentioned above are conducted in two cases with embedment case and with no embedment. The total cases conducted in this study are 96, 12 mechanical cases and 84 FEM cases.,Ph.D | |
| dc.language.iso | eng | |
| dc.publisher | UKM, Bangi | |
| dc.relation | Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina | |
| dc.rights | UKM | |
| dc.subject | Modelling techniques | |
| dc.subject | Water tank | |
| dc.subject | Soil and water | |
| dc.subject | Water towers | |
| dc.title | Various modelling techniques in seismic response of elevated concrete water tank considering interactions with soil and water | |
| dc.type | Theses | |
| dc.format.pages | 222 | |
| dc.identifier.callno | TA658.44.A436 2013 3 | |
| dc.identifier.barcode | 000294 | |
| Appears in Collections: | Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina | |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| ukmvital_74760+Source01+Source010.PDF Restricted Access | 8.56 MB | Adobe PDF |  View/Open |
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