Dynamic analysis of concrete rectangular ground tanks equipped with base isolators due to transitional and rotational components of earthquakes

Document Type : Original Article

Authors

1 Department of Structural Engineering, Faculty of Civil Engineering, Tabari University, Babol

2 Department of Civil Engineering, Faculty of Engineering, Payame Noor University, Tehran, Iran.

3 Faculty of Civil Engineering, Noshirvani University of Technology, Babol.

Abstract

In this research, the behavior of concrete rectangular ground tanks equipped with lead-rubber base isolators has been investigated under the simultaneous excitation of transitional and rotational components of earthquakes, using nonlinear time history analysis including water-structure interaction. For this purpose, first, the rotational component of three earthquakes was generated using the wave propagation and classic elasticity theories simultaneously. Then, the tanks equipped with appropriate number of base isolators were modeled in two volumes of 500 and 1000 m3 and three states of water level. In modeling the finite elements of the isolators, a model consisting of one-dimensional elements is proposed; whose hysteresis behavior is equivalent to the behavior of the three-dimensional model of the isolators.

The results of the research show that the decreasing or increasing effect of the rotational component of the earthquake on the seismic response of these tanks in the full and half-full state is less than 10%, and in general, its effect on the seismic response of the rectangular ground tanks can be ignored. Also, the presence of isolators in these types of tanks has increased the response of the tanks in all states. So that the base shear force has increased up to 4 times and the normal stress has increased between 8 and 23 times, which can be attributed to the increase in the period of ground tanks from the initial range of the response spectrum to the constant acceleration region of the spectrum due to the presence of the base isolators.

Keywords

References

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