Modal Analysis on Anchored Tank Considering Shell and Fluid Coupling
Earthquake response of structure is determined by the vibration properties of earthquake and structure, it is very important for seismic design of storage tanks to accurately grasp the vibration characteristics of tank (frequency and mode shapes). In this paper, finite element model of exposure anchored 2000m3 tanks has been established by software ANSYS, calculating the first 3 order frequencies of liquid (0.247, 0.418, 0.517Hz) and frequencies of beam modes (6.087, 12.748, 21.77Hz), and comparing with the results of standard formula and the literature, both are in permissible error range. Vibration law of tanks has been analyzed, and it is proved that cosθ-type beam modes played a major role in seismic performance of tanks. These can be used as a reference for analysis and design of similar projects.
L. P. Yi and J. Ji, "Modal Analysis on Anchored Tank Considering Shell and Fluid Coupling", Advanced Materials Research, Vol. 549, pp. 903-907, 2012