Hasan Basri Başağa

Nonlinear analysis of rock-fill dams to non-stationary excitation by the stochastic Wilson-θ method

Abstract The objective of this investigation is to predict the nonlinear response of a rock-fill dam subjected to non-stationary excitation by using the finite element method in conjunction with the equivalent linearization approach. The nonlinear behavior is based on the equivalent linear method which considers the nonlinear variation of soil shear moduli and damping as a function of shear strain. Linear and non-linear analyses are performed by the stochastic Wilson- θ method. Nonlinear response of a rock-fill dam disturbed by non-stationary random excitations is compared with the linear analysis. Meanwhile, some statistical responses obtained by the linear and nonlinear analyses are checked by the Monte Carlo simulation technique. Finally, the effect of deconvolution ground motion on the nonlinear response of dam-foundation system is investigated in this paper. Two different earthquake input mechanisms are used in the dynamic analysis: the standard rigid-base input and the deconvolved-base-rock input models.

Creation of Similarity Requirement with Field Equations in Steel Bearing Systems

This paper aimed to determine the structural behavior of steel bearing systems by creating similarity conditions with field equations. Scaling plays a crucial role in designing experiments aimed at understanding the structural behavior of systems where experimental studies are difficult to perform due to huge structures in the profession of engineering field. Scaling can be performed by using dimensional analysis or by normalizing differential equations that describe the dynamics of the system. If a model and prototype are dimensionally similar, it is possible to estimate experimental results from model to prototype.