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Evaluation of Seismic Response Parameters in On-Grade Cylindrical Steel Storage Tanks Considering Wave Propagation in Under Laying Soil
, M.Sc. Thesis Sharif University of Technology ; Rahimzadeh Rofooei, Fayaz (Supervisor)
Abstract
The circular flexible cylindrical liquid tanks are usually made of steel or aluminum and in majority of cases are built on grade due to its economic advantages. The most important part of a safe design of storage tanks is the accurate estimation of the seismically induced lateral forces that should be transformed to its base through the tank shell and its support . seismic behavior of the liquid storage tank is quite different from regular buildings industrial structures due to its nonlinear behavior caused by complex distribution of hydrodynamic pressure, buckling of its wall, etc.. moreover, the effect of rocking motion caused by under laying soft soil, on its response parameter could be...
A new dynamic procedure for evaluation of steel storage tanks under multidirectional seismic excitations
, Article KSCE Journal of Civil Engineering ; Vol. 18, Issue. 6 , 2014 , pp. 1696-1703 ; ISSN: 12267988 ; Sharif University of Technology
Abstract
Endurance Time (ET) method is a new dynamic procedure that has been recently developed for seismic safety evaluation of structures. This method is based on the comparison of seismic response of new-designed or existing structures under intensifying ET records with the pre-assigned damage index. Also this method can efficiently reproduce the seismic responses of the structures excited by scaled earthquakes that are required in time history analysis by the codes. In this paper, first general idea of this new method is described and then is applied to evaluate the seismic safety of a cylindrical steel storage tank under multidirectional excitations. It is shown that the ET method can predict...
Seismic Response and Buckling behavior of Aboveground Cylindrical Steel Tanks
, Ph.D. Dissertation Sharif University of Technology ; Rahimzadeh Rofooei, Fayaz (Supervisor) ; Khaje Ahmad Attari, Nader (Co-Advisor)
Abstract
In this study, the seismic response of aboveground, anchored cylindrical steel tanks subjected to horizontal and vertical ground acceleration is investigated. The buckling capacity of the steel tanks is estimated using static pushover (SPO) and incremental dynamic analyses (IDA). Finite element models of a broad tank and a tall tank with height to diameter ratios (H/D) of 0.40, 0.80 and with a liquid level of 90% of the height of the cylinder were used in this study. Appropriate load patterns due to the horizontal and vertical components of ground excitations are utilized for SPO analyses. The influence of the vertical component of ground acceleration on buckling capacity curve of the tank...
Application of Added Dampers in Seismic Response Reduction of Fixed Roof Steel Cylindrical Tanks
, M.Sc. Thesis Sharif University of Technology ; Rahimzadeh Rofooei, Fayaz (Supervisor)
Abstract
The objective of this research is to investigate the use of passive control system to reduce the seismic response of fixed-roof, above-ground, cylindrical steel tanks as well as to decrease the damage caused to these structures in the event of an earthquake. The most crucial step for a safe design in this case is determining the lateral forces due to earthquake with sufficient accuracy; These forces are eventually resisted by the storage tank walls and the supports. Determining analiytical solution to the problem is not possible due to the interaction of the liquid with the structure. Therefore, numerical approach was adopted to determine the response of the tank using ANSYS program. Two...