İnşaat Mühendisliği Bölümü Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.11779/1943

Browse

Filters

2015 - 20183

Settings

Author: search.filters.author.Kurtuluş, AslıPublisher: search.filters.publisher.Springer

Search Results

Now showing 1 - 3 of 3
  • Conference Object
    Citation - WoS: 10
    Citation - Scopus: 12
    Implications of Site Specific Response Analysis
    (Springer, 2018) Tönük, Gökçe; Tönük, Gökçe; Ansal, Atilla; 02.04. Department of Civil Engineering; 02. Faculty of Engineering; 01. MEF University
    Definition of design earthquake characteristics, more specifically uniform hazard acceleration response spectrum, on the ground surface is the primary component for performance based design of structures and assessment of seismic vulnerabilities in urban environments. The adopted approach for this purpose requires a probabilistic local seismic hazard assessment, definition of representative site profiles down to the engineering bedrock, and 1D or 2D quivalent or nonlinear, total or effective stress site response analyses depending on the complexity and importance of the structures to be built. Thus, a site-specific response analysis starts with the probabilistic estimation of regional seismicity and earthquake source characteristics, soil stratification, engineering properties of encountered soil layers in the soil profile. The local seismic hazard analysis would yield probabilistic uniform hazard acceleration response spectrum on the bedrock outcrop. Thus, site specific response analyses also need to produce a probabilistic uniform hazard acceleration response spectrum on the ground surface. A general review will be presented based on the previous studies conducted by the author and his co-workers in comparison to major observations and methodologies to demonstrate the implications of site-specific response analysis.
  • Conference Object
    Citation - WoS: 1
    Citation - Scopus: 1
    A Simplified Approach for Site-Specific Design Spectrum
    (Springer, 2017) Tönük, Gökçe; Tönük, Gökçe; Ansal, Atilla; 02.04. Department of Civil Engineering; 02. Faculty of Engineering; 01. MEF University
    The design acceleration spectrum requires site investigations and site-response analyses in accordance with the local seismic hazard. The variability in earthquake source and path effects may be considered using a large number of acceleration records compatible with the earthquake hazard. An important step is the selection and scaling of input acceleration records. Likewise, a large number of soil profiles need to be considered to account for the variability of site conditions. One option is to use Monte Carlo simulations with respect to layer thickness and shear wave velocity profiles to account for the variability of the site factors. The local seismic hazard analysis yields a uniform hazard acceleration spectrum on the bedrock outcrop. Site-specific response analyses also need to produce a uniform hazard acceleration spectrum on the ground surface. A simplified approach is proposed to define acceleration design spectrum on the ground surface that may be considered a uniform hazard spectrum.
  • Conference Object
    Observations From Geotechnical Arrays in Istanbul
    (Springer, 2015) Tönük, Gökçe; Tönük, Gökçe; Cetiner, Barbaros; Ansal, Atilla; Çtiner, Barbaros; 02.04. Department of Civil Engineering; 02. Faculty of Engineering; 01. MEF University
    Few small earthquakes with local magnitude slightly larger than M-L = 4 were recorded by geotechnical downhole arrays that have been recently deployed in the west side of Istanbul. Same events were also recorded by Istanbul Rapid Response Network (IRRN) which comprises of 55 surface strong motion stations in the European side of Istanbul. The strongest one of these earthquakes took place on 12/3/2008 in Cinarcik with local magnitude of M-L = 4.8. Even though the observed PGAs were not exceeding 0.01 g, an effort is made to model the recorded response at the downhole array sites as well as the at the IRRN stations using the acceleration records obtained by the deepest sensors, i.e. on the engineering bedrock, at the downhole array sites as input bedrock motions. 1D equivalent linear site response analysis that is generally adopted for site-specific response analysis is used for modelling. Observations from the recorded response and results from 1D modelling of ground response have yielded in general good agreement between the observed and recorded soil response at the station sites.