Development of Seismic Fragility Curves of Cylindrical Concrete Tanks Using Nonlinear Analysis

Document Type : Research Article


1 Master of Civil Engineering, Structural Research Institute, International Institute of Earthquake Engineering and Seismology, Tehran, Iran

2 Noshirvani University, faculty of civil engineering

3 Associate Professor at Structural Engineering Research Center of IIEES


Fluid storage tanks are one of the most important components of vital lifelines, especially oil, petrochemical, and water transmission systems. The seismic behavior of liquid tanks in previous earthquakes shows that major damages in water reinforcement concrete tanks are shell cracking and consequential liquid leakage. In the present paper, the dynamic behavior of ground-supported concrete tanks is investigated to develop related fragility curves. The nonlinear numerical simulation is performed for three cases of concrete cylindrical tanks with variable height to diameter ratios. In these simulations cracking of concrete is considered as the damage criteria, and the fragility curves of the tanks for the critical crack width recommended by the Iranian code of 123 are developed. These curves are compared with those recommended by previous researchers and extracted from linear analyses. The results indicate that the three-dimensional iterative cracks and their effect on the total dynamic response of concrete storage tanks can considerably affect the shape of fragility curves which is generally used for mentioned network risk assessment.


Main Subjects

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