Browsing by Author "Erdil, B."

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The 23 October 2011 Mw7.0 Van (Eastern Turkey) Earthquake: Interpretations of Recorded Strong Ground Motions and Post-Earthquake Conditions of Nearby Structures
(Earthquake Engineering Research Institute, 2014) Akansel, V.; Ameri, G.; Askan, A.; Caner, A.; Erdil, B.; Kale, O.; Okuyucu, D.
A major thrust-fault earthquake of MW = 7.0 occurred on 23 October 2011 at 10:41:21 UTC in the eastern Anatolian region of Turkey, severely affecting the nearby towns of Van and Erciş. In this study, a few strong-motion records from the epicentral area are analyzed in order to investigate the characteristics of the ground motions. Also reported are the post-earthquake field observations for various types of structures, such as buildings, bridges, historical structures, tunnels, and dams within the vicinity of the fault plane. The spatial distribution of damage indicates a noticeable hanging-wall effect. The special-type structures are observed to experience far less damage, as opposed to the building structures in the region pointing to the need for strict compliance to seismic building code and the corresponding construction requirements.© 2014, Earthquake Engineering Research Institute.
Behaviour of Cfrp Confined Low Strength Concrete Columns Under Temperature Changes
(2012) Erdil, B.; Akyuz, U.; Yaman, I.O.
In this study, an experimental program was established to understand the behaviour of FRP-confined low strength cylindrical and square-section concrete columns under temperature changes. The experimental program was divided into four groups. First group of specimens were kept under room temperature and used as control specimens. In the second group, specimens were exposed to predetermined heating-cooling cycles in a specially designed environmental test chamber. Third group of specimens were placed in water, kept in the environmental test chamber, and subjected to the same heating-cooling cycles. In the last group, specimens were subjected to outdoor exposure in Ankara, Turkey. After the aging tests, specimens were tested under uniaxial compression to determine the change in their mechanical properties.
Characterisation of Cement Loaded With Magnetically Aligned Nano-Magnetite
(ICE Publishing, 2023) Jassam, T.M.; Lau, B.; Yang-Zhi, J.N.; Kien-Woh, K.; Al-Mansob, R.A.; Erdil, B.; Luo, W.
In this study, the effect on the compressive strength of cement with the addition of 1-5 wt% nano-magnetite particles (nano-Fe3O4) is identified at the age of 7 days and 28 days of curing. In addition, an approach of aligning these nano-magnetite particles within cement using an external magnetic field is presented, where the orientation of nano-magnetite particles is aligned parallel to the compressive load. The effect of the compressive strength on cement mortar with the aligned nano-magnetite particles is compared with the non-aligned samples. Both aligned and non-aligned samples show positive effects on the compressive strengths as compared to the control samples, where the cement mortar with aligned nano-magnetite shows significant improvement on compressive strength up to 21%. This study also shows that the addition of 3 wt% nano-magnetite particles to cement mortar is the optimal amount to achieve maximum enhancement of compressive strengths. © 2023 Emerald Publishing Limited: All rights reserved.
A Comparative Study of Force-Deformation Relationship of Frp-Confined Concrete Columns
(2011) Erdil, B.; Akyuz, U.; Yaman, I.O.; Irfanoglu, A.
In this study, the FRP-confined concrete models for prismatic members given in the ACI440.2R-08 and Turkish Earthquake Code (TEC2007) are compared with the experimental data taken from the literature. It is found that TEC2007 assumes only hardening behavior for concrete strengthened with FRP. Although ACI440.2R-08 assumes a hardening and softening behavior depending on the confinement-effectiveness, the limit separating the hardening and softening must be improved to predict the behavior well. The assumptions in these codes cannot predict the post-peak region of force-deformation curves because of the high factor of safeties. It is essential to understand the degree of confinement, confinement effectiveness and the resulting stress-strain relationship of a concrete strengthened with FRP.
Damage From Two Consecutive Earthquakes at City of Van (Turkey)
(Earthquake Engineering Research Institute, 2014) Aldemir, A.; Erdil, B.; Demirel, I.O.; Yakut, A.; Binici, B.
One of the most devastating natural events is, definitely, earthquake. The energy released from earthquakes test performance of a large building stock. Distressingly, some buildings fail to possess enough strength and/or ductility during these events, causing loss of lives and property. Therefore, the observations from past natural events play an important role in decreasing the losses during future natural disasters. In 2011, two consecutive earthquakes occurred in Van region, eastern part of Turkey in a three-week period. United States Geological Survey (USGS) reported the magnitudes as 7.1 and 5.6 with focal depths of 16 km and 5 km, respectively. Teams from the Earthquake Engineering Research Center (EERC) of Middle East Technical University (METU) visited the site after each earthquake and made a reconnaissance survey, which enabled to monitor the damage distributions and structural deficiencies. In this study, the damage accumulation at Van city and Ercis district is summarized by focusing on approximately 100 structures, surveyed after both earthquakes. The observed structural damages as well as the parameters affecting damage are discussed based on statistical data collected from site observations.
Mechanical Behavior of Cfrp Confined Low Strength Concretes Subjected To Simultaneous Heating-Cooling Cycles and Sustained Loading
(Springer, 2012) Erdil, B.; Akyuz, U.; Yaman, I. O.
This study aims to present the mechanical behavior of carbon fiber reinforced polymers (CFRP) reinforced low strength cylindrical and prism concrete specimens under both heating-cooling cycles and sustained loading. Heating-cooling cycles range from -10 to 50A degrees C and the applied sustained load level is 40% of the ultimate strength of concrete. After 200 heating-cooling cycles and/or sustained load testing, specimens were tested to determine the mechanical behavior under uniaxial compression. The experimental test results show that heating-cooling cycles alone have insignificant effect on the mechanical properties of CFRP-wrapped specimens. However, as for simultaneous exposure of sustained loading and heating-cooling cycles the main difference is on the shape of the stress-strain diagram, in which the bilinear response becomes clear. The other difference is on the ultimate strain, which decreases up to 29 and 15% for cylindrical and prismatic specimens, respectively.