A parametric study of seismic response in anchored steel tanks with endurance time method


Department of Civil Engineering, Sharif University of Technology, Tehran, Iran


In this paper, the seismic response of anchored cylindrical steel tanks with various dimensional parameters has been investigated by endurance time method considering fluid-structure interaction e ects. Various response quantities, such as stresses and displacements, have been evaluated by subjecting tanks to specially designed intensifying accelerograms and their performance is judged based on their response at prede ned level(s) of dynamic excitation. It is shown that ET analysis can reliably predict the result of ground motion time history analysis in all seven tank models studied. In four of the tanks in which height of the shell and the level of  fluid is the same, the variation of signi cant parameters with height to diameter ratio is discussed. The reliability of the ET method in predicting the response of models considering nonlinear material and geometric nonlinearity is also investigated using a limited number of models. In general, results by endurance time method, while entailing highly reduced computational demand, appear to be reasonably consistent with those from ground motions in anchored steel tanks analysis considering fluid-structure interaction.