WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7150

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Institution Author: search.filters.institutionAuthor.Demirci, Hasan Emre

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  • Conference Object
    Citation - WoS: 1
    Fem Analysis With Special Focus on Soil-Structure Interaction of Floating Slab-Track Infrastructure in High Speed Railway Embankments
    (University of Zagreb Faculty, 2014) Bakunowicz, Paulina; Egeli, İsfendiyar; Demirci, Hasan Emre; Egeli, İsfendiyar; 03.03. Department of Civil Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    Use of Floating Slab Track (FST) type infrastructure systems in high speed railway (HSR) embankments is becoming increasingly popular in the world today as well as a mean of vibration isolation and safe and fast rail travel. The main emphasis of this study is on the application of non-ballasted concepts for high-speed operation used in the design of Far Eastern HSR embankments and a manufactured floating slab track system. In this paper, finite element method (FEM) is used to model soil-structure interaction. Effects of soil stiffness (k(s)) are carefully investigated. Longitudinal settlements are obtained and checked against allowable values. The study has confirmed the quality and reliability of the FST systems, which continue to have huge use in high speed rail design-construction projects nowadays.
  • Article
    Citation - WoS: 34
    Citation - Scopus: 39
    Influence of Consolidation Properties on the Cyclic Re-Liquefaction Potential of Sands
    (Springer Verlag, 2015) Ecemiş, Nurhan; Demirci, Hasan Emre; Ecemiş, Nurhan; Karaman, Mustafa; 03.03. Department of Civil Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    The relative density can be used as the main indicator to assess the liquefaction resistance of clean sands. As relative density of the sand deposit increases significantly following the initial liquefaction, one should expect that the soil can improve its liquefaction resistance. However, earthquake records indicate that densified sand can be liquefied again (re-liquefied) at smaller cycles by the similar seismic loadings. This work aims to clarify the counterintuitive finding that, after the first liquefaction, the resulting significant increase in relative density (induced by settlements and variation of the water level) do not necessarily imply an increase in the number of loading cycles for re-liquefaction. In this paper, we present a series of experimental results concerning the cyclic liquefaction and the following re-liquefaction of clean sand deposits. The experimental setup is performed by a shaking table, transmitting one-degree of freedom transversal motion to the soil within the 1.5 m high laminar shear box. At four different seismic demands, the input excitation was imposed three times to examine the influence of the initial distributions of the relative density and the consolidation characteristics on the liquefaction potential of the sand. The re-liquefaction cycles of the sand, which previously experienced liquefaction under the same seismic loadings, show that post-liquefaction reconsolidation of the sand deposits affects the re-liquefaction resistance.