Investigation of Soil Structure Interaction and Wall Flexibility Effects on Natural Sloshing Frequency of Vessels
Abstract: The main purpose of
this study is to establish the effects of vessel walls flexibility on its
natural sloshing frequency considering soil-structure-fluid interaction theory.
Furthermore, two new efficiently relations to find both of wall flexibility and
soil-structure interaction effects on natural frequency are developed. Regarding
the aim of current study three different conditions of elevated tanks are
applied. Fixed base condition with an emphasis on recommendations of
international code ACI-350, analytical FSSI regarding equivalent mass spring
method, and the numerical direct method regarding theory of finite element are
taken into consideration. Results indicate that there is no significant effect
of walls flexibility on natural sloshing frequency regarding fixed base
assumptions of vessels. On the contrary, significant effects of wall
flexibility are achieved considering SSI theory. Results of international code
ACI-350 show that, the international codes assumptions have imprecise
estimations of natural sloshing frequency in the range of hard to very soft
soil categories. On the other hand, it
is observed that the wall flexibility has a more highlighted effect on natural
frequency in soft soils rather than soil-structure interaction. The
significance of wall flexibility effect on natural frequency is more than that
of SSI considering soil softening.
Keywords: Natural Sloshing
Frequency; Finite Element; Flexibility; Vessel; Soil-Structure Interaction
Author: Pouyan Abbasi Maedeh,
Ali Ghanbari, Wei Wu
Journal Code: jptsipilgg170001
