Abstract
This paper aims to observe effects of fluid-structure-soil interactions on the response modification coefficient of elevated concrete tanks with frame and shaft supporting systems. Because of weaknesses and failures of elevated tanks that have been reported in recent earthquakes and importance of optimum and resistant design and also better seismic performance of these structures, it is essential to investigate on the response modification coefficient of elevated concrete tanks. In this paper, the response modification coefficient has been evaluated by using the numerical modeling. The method of research is a case study. The models have been subjected to an ensemble of important earthquake ground motions. The effects of soilstructure interactions and fluid-structure interactions on seismic behavior of the elevated concrete tanks have been modeled by the equivalent springs and Housner’s method, respectively. Dynamic response of the elevated tanks has been considered by using the nonlinear time history analysis and the discrete plastic hinge approach. Finally, the effects of fluid-structure-soil interactions on the response modification coefficient of the elevated concrete tanks have been discussed by considering results of the analyses. It has been concluded that the codes may underestimate base seismic forces for some seismic regions and some subsoil classes.
Highlights
Water supply is very essential to put out a fire and other vital needs for example drinking water especially after earthquakes
The nonlinear response of elevated tanks can be considered by means of the pushover analysis or the dynamic analysis
The dynamic response of elevated tanks has been studied by the method of the nonlinear time history analysis that it can consider effects of higher modes
Summary
Water supply is very essential to put out a fire and other vital needs for example drinking water especially after earthquakes. Concept of the response modification coefficient is used for considering ductility in the design and evaluation of base seismic forces. How to behavior of the fluid into containers and the subsoil are important and effective for evaluation of the response modification coefficient. It must be studied until elevated tanks remain safety and operational, in future earthquakes. General methods of the design in the codes usually secure stiffness and strength of a structure by limiting displacements and without concentrating on target conditions of elements In these methods, there is no guarantee to utilize the ductile capacity of all elements. It has been tried to consider these points and used the discrete plastic hinge
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