Yazar "Akbas, Sami Oguzhan" seçeneğine göre listele

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    Assessment of the peak acceleration, amplification ratio and fundamental period properties for the kirikkale province settlement area
    (Gazi Univ, Fac Engineering Architecture, 2015) Sonmezer, Yetis Bulent; Akbas, Sami Oguzhan; Isik, Nihat Sinan
    Due to its proximity to active fault zones such as Bala, Seyfe, Karakecili, Kirikkale-Sungurlu and Keskin, the province of Kirikkale is classified within the highest earthquake hazard zone in accordance to the Turkish Earthquake Code. In this study; a site-specific site response analysis was performed using equivalent linear method to estimate the local site effects on seismic ground motions and for guidance to the future construction activities. For this purpose, geotechnical and geophysical data compiled from 107 soil exploration borings, 15 seismic refraction and 6 MASW tests were employed. In the analyses, the ground motion record of the 1999 Duzce Earthquake from the Lamont-1061 station was used. The spatial distribution of peak ground acceleration, soil amplification ratio and the fundamental period are presented as maps. The results indicate high ground acceleration and medium-high period values within the study area.
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    Linear and nonlinear site response analyses to determine dynamic soil properties of Kirikkale
    (Techno-Press, 2018) Sonmezer, Yetis Bulent; Bas, Selcuk; Isik, Nihat Sinan; Akbas, Sami Oguzhan
    In order to make reliable earthquake-resistant design of civil engineering structures, one of the most important considerations in a region with high seismicity is to pay attention to the local soil condition of regions. It is aimed in the current study at specifying dynamic soil characteristics of Kirikkale city center conducting the 1-D equivalent linear and non-linear site response analyses. Due to high vulnerability and seismicity of the city center of Kirikkale surrounded by active many faults, such as the North Anatolian Fault (NAF), the city of Kirikkale is classified as highly earthquake-prone city. The first effort to determine critical site response parameter is to perform the seismic hazard analyses of the region through the earthquake record catalogues. The moment magnitude of the city center is obtained as M-W,=7.0 according to the recorded probability of exceedance of 10% in the last 50 years. Using the data from site tests, the 1-D equivalent linear (EL) and nonlinear site response analyses (NL) are performed with respect to the shear modulus reduction and damping ratio models proposed in literature. The important engineering parameters of the amplification ratio, predominant site period, peak ground acceleration (PGA) and spectral acceleration values are predicted. Except for the periods between the period of T=12-1.0 s, the results from the NL are obtained to be similar to the EL results. Lower spectral acceleration values are estimated in the locations of the city where the higher amplification ratio is attained or vice-versa. Construction of high-rise buildings with modal periods higher than T=1.0 s are obtained to be suitable for the city of Kirikkale. The buildings at the city center are recommended to be assessed with street survey rapid structural evaluation methods so as to mitigate seismic damages. The obtained contour maps in this study are estimated to be effective for visually characterizing the city in terms of the considered parameters.
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    Seismic risk estimation of the Kirikkale province through street survey based rapid assessment method (SSRA)
    (Techno-Press, 2018) Sonmezer, Yetis Bulent; Bas, Selcuk; Akbas, Sami Oguzhan
    The seismic vulnerability of Turkey is relatively high due to its active fault systems with potential to create destructive earthquakes. Thus, reducing the loss of life and property, the number of the earthquake-prone buildings and their retrofit requirements are considerably significant key issues under the scenario earthquakes. The street survey based rapid assessment (SSRA) method can be considered as a powerful tool to determine the seismic vulnerability of building stock of an earthquake-prone city/state. In this study, the seismic vulnerability of the building stock of the Kirikkale province in Turkey is aimed to be estimated adopting the street survey based rapid assessment method (SSRA). For this purpose, central 2074 existing reinforced concrete (R/C) buildings were structurally surveyed with rapid visual site screening and disadvantages such as, the existence of short-column, soft-story, heavy overhangs, pounding effect and local soil conditions were determined for obtaining the structural performance score of each. The results obtained from the study demonstrate that 11-25% of the surveyed buildings in the study region needs to be investigated through more advanced assessment methods. Besides, higher correlation between increasing story number and unsafe/safe building ratio is obtained for the buildings with soft-story parameter than that for those with heavy overhangs and short-column parameters. The conformity of the results of the current study with the previous documented cases of rapid assessment efforts in the recent earthquakes in Turkey shows that the SSRA method for the Kirikkale province performed well, and thus this methodology can be reliably used for similar settlement areas.