Institute of Earthquake Engineering and Engineering Seismology

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Author: search.filters.author.Stanko, Davor

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    Item type:Publication,
    Assessment of soil behavior in seismic excitations by exploring different approaches
    (University of Zagreb Faculty of Civil Engineering, 2024-10-08)
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    Stanko, Davor
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    Salic-Makreska, Radmila
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    In geotechnical earthquake engineering seismic site response analysis is a very complex task, which has gained an increasing importance for the last decades. This paper aims to numerically simulate the effect of an earthquake input in different types of soil layers in order to get the dynamic amplification factor. The methodology for correctly simulation of seismic waves propagation includes thorough theoretical background aided with different softwares (Shake, Strata,DeepSoil and Plaxis) which allow the simulation of soil as nonlinear material model or small strain linearly elastic material. The verification of the model is done by comparison of numerical results in relation to two different soil profiles from Varazdin, Croatia and from Skopje, Macedonia. The proposed approach should demonstrate and illustrate the special points in taking into account the modelling of different layers. The earthquake input is given as acceleration signal which in case of low densities of soil material are prone to initiate higher amplifications. Finally, the advantages and limitations of the proposed numerical model are discussed in detail.
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    Item type:Publication,
    EFFECTS OF GROUND MOTION INTENSITY IN ASSESSMENT OF SOIL SLOPES IN EARTHFILL DAM
    (University of Zagreb Faculty of Civil Engineering, 2025-03-19)
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    Stanko, Davor
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    Shalic-Makreska, Radmila
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    The cumulative displacement of sloped soil masses in earth-fill dams subjected to seismic loading is fundamentally governed by both the magnitude and frequency characteristics of the seismic excitation. This correlation necessitates comprehensive numerical simulations incorporating diverse acceleration time histories to capture the full spectrum of potential seismic responses. This manuscript examines the response of an earth dam slope susceptible to seismically-induced instability under various earthquake scenarios with distinct magnitude-frequency characteristics. The accurate modeling of soil media becomes particularly critical in situations where dynamic pore pressure generation occurs within the soil matrix. The coupled numerical approach developed in this study conceptualizes the soil element as a three-phase medium composed of soil grains, pore water and pore air. The simulation considers a nonlinear behavior with respect to the water retention curves and material model for the solid state and analysis is performed by ANSYS and PLAXIS. The air pressure is assumed to stay atmospheric in the course of the calculation and matric suction is equal to a negative value of the hydrostatic stress in water pressure. The coupled model allows to take into account the deformations of the soil skeleton and simultaneously considers the pore water pressure change during the earthquake excitation. The seismic behavior of the slope gives interesting results considering both deformation and pore water pressure development. The primary objectives of this research are to investigate the seismic response of earth dam slopes under various earthquake scenarios and compare results between ANSYS and PLAXIS software implementations for multiphase soil modeling. The contributions include the development of a comprehensive coupled numerical approach that simultaneously considers soil deformation and pore pressure evolution during seismic loading along with the integration of hypoplastic material model with multiphase flow analysis.