Earthquake induced dynamic deflection of submerged viscoelastic cylindrical shell reinforced by agglomerated CNTs considering thermal and moisture effects

Abstract

This study gives a numerical work on dynamic response of cylindrical shells submerged in an incompressible fluid subjected to earthquake, thermal and moisture loads. The cylindrical shell is reinforced by carbon nanotubes (CNTs) where the Mori-Tanaka model is used for calculating the effective material properties of the structure considering agglomeration effects. The effect of the fluid is assumed using the acoustic wave equation. The structural damping effect is considered using Kelvin-Voigt model. Sinusoidal shear deformation shell theory (SSDT) is utilized in the shell dynamical equations based on energy method and Hamilton’s principle. The problem is framed combining shell motion equations with the acoustic wave equation where the fluid-loaded terms are considered with Hankel function of second kind. Differential quadrature method (DQM) and Newmark approach are employed to solve the shell problem. The influences of fluid, boundary condition, thermal load, moisture changes, boundary condition, structural damping parameter, length to thickness ratio of shell, CNTs volume percent and agglomeration are shown on the dynamic deflection of the structure. The results show that increasing the CNTs volume percent, the dynamic deflection decreases while considering the CNTs agglomeration leads to increase in the dynamic deflection of the structure.