الفهرس 
:INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
An examination of prior earthquakes demonstrates that vital lifeline infrastructures such as elevated water tanks are damaged or collapsed in recurrence, causing substantial concerns even after the catastrophe. In light of such concerns, which point to flaws in existing seismic design strategies for such structures.
It has been revealed that the seismic behavior of a structure is highly influenced not only by the response of the superstructure but also by the response of the soil beneath the foundation.
The modelling of soil-structure interaction passes through several stages along with the history of research. The up to date models consist of two types: the substructure approach, which models the soil as discrete multi-directional springs (depending on soil flexibility). The second is the direct analysis approach, which models the superstructure, foundations, and supporting soil through finite elements (FEMA P 2091-2020).
The main objective of this study is to investigate the effect of soil structure interaction (SSI) on the seismic response of reinforced concrete rectangular elevated water tanks throughout using the sub-structure approach to represent the soil flexibility. It can be represented by a set of elastic springs using the well-known finite element modelling program SAP2000.
In addition, review the effect of soil structure interaction on the values of response modification factor (R) while changing the soil type and other different parameters and compare these results with the results when the effect is neglected.
Also, proper rational values of the response modification factor (R) for the Elevated reinforced concrete water tanks based on the analysis results were suggested, and the results were compared with the listed values in the ECP-201(2012).
A verification application of the nonlinear pushover analysis technique considering the effect of Soil Structure interaction is developed to compare the application’s results to previously published case studies. The rectangular reinforced concrete elevated tanks are next subjected to a thorough parametric investigation, taking into account variations in soil type, tank height, seismic zones, tank capacity, and seismic zone, comprised of 108 case studies. Then the relation between the base shear and displacement is plotted.
The obtained results throughout the tables and graphs conclude that, soil structure interaction has a considerable effect on the seismic characteristics and on response modification factor (R) for rectangular reinforced concrete elevated water tanks which has more conservative values in different codes.