S Resatalab - Ph.D. Candidate, Department of Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran
M.T Ahmadi - Professor, Department of Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran
M Alembagheri - Associate Professor, Centre for Infrastructure Engineering, Western Sydney University, Sydney, Australia. On leave from Department of Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran
N Kamboozia - Associate Professor, Road and Transportation, Civil Engineering Department, Iran University of Science and Technology, Tehran, Iran

In this article, parameter sensitivity analysis of the dynamic response of cylindrical intake towers interacting with the concrete dam, foundation, internal and surrounding water is performed. The tower is modelled using three-dimensional finite elements according to the Eulerian-Lagrangian approach. To carry out a parametric study, the optimization method is used to distinguish the most influential parameters. Thus, the iteration algorithm and number ofnumerical tests are designed. The models are tested under longitudinal horizontal excitation of selected reference. The evaluation of the results indicated that the two parameters, i.e. tower’s slender ratio, and the surrounding water depth are the most effective factors on intake tower’s top drift under seismic excitations. It is observed that the elasticity modulus of the foundation is another influential factor in the seismic response, as the tower’s drift increases with the foundation’s flexibility. Furthermore, the effect of dam interaction on the tower drift reduces as the distance from the dam increases and stays relatively constant for any distance higher than twice the tower’s height

Intake tower, Interaction intake tower- dam- foundation, seismic response, Hydrodynamic pressure