Search

Bu çalışmada, mineral katkılı beton ve nervürlü betonarme demiri arasındaki aderans dayanımına yüksek sıcaklığın (800 0C) etkisi araştırılmıştır. Mineral katkı olarak çimento ağırlığının %10'u oranında silis dumanı ve %15'i oranında da uçucu kül kullanılmıştır. Agreganın maksimum tane çapı (dmax) 16 mm'dir. Aderans deneyleri için 100×200 mm ölçülerinde silindir numuneler, basınç deneyleri için 150×150×150 mm ölçülerinde küp numuneler hazırlanmıştır. 20±2 0C de 28 gün su kürü uygulanan numuneler, 270 gün hava küründe bekletildikten sonra 800 0C'de yakılmış, aderans ve basınç dayanım deneyleri yapılmıştır. Çalışmadan elde edilen sonuçlara göre yakılan betonlarda, silis dumanı katkılı numunelerin basınç ve aderans dayanımlarının daha yüksek olduğu görülmüştür. Silis dumanı katkılı numuneleri sırasıyla, uçucu kül katkılı ve mineral katkısız numuneler takip etmiştir.

In Turkey, reinforced concrete sections which are suffered corrosion of reinforcement because of inadequate concrete cover, bad material, damaging environmental actions etc. are frequently observed. Reduction in cross-section diameter of reinforcement, loss of bond stress, cracks in concrete, and changes in the mechanical properties of reinforcement are mainly results of corrosion. Negative results of the structural behavior of buildings which have located in earthquake zones should be investigated. The aim of this study is to examine the behavior of reinforced concrete building frame systems exposed to rebar corrosion and earthquake loads. Structural behavior of sound system (the system without corrosion) will be compared with respect to behavior of corroded system. Nonlinear analyses were performed on the sound frame system and on the frame systems exposed to different level of rebar corrosion. These analyses have occurred in two steps. In the first step (the section analysis), normal force-moment (N-M) interaction diagrams and moment-curvature (M-κ) diagrams of column and beam sections for each different corrosion level are drawn. In the second step (system analysis) static pushover analysis were performed for each different corrosion stituation, modal capacity curves were obtained and the target displacement were calculated for each corrosion level. In addition, damages of sections were examined. In analysis, such as ATC-40, FEMA- 273, TEC-2007, national and international specifications were benefitted for analysis. According to the results of analysis; type, intensity and location of corrosion affect behavior of structural system negatively. During the seismic evaluation of existing buildings, consideration corrosion effects are suggested as versatile. [ABSTRACT FROM AUTHOR]

Copyright of Journal of the Institute of Science & Technology of Dumlupinar University / Dumlupinar Üniversitesi Fen Bilimleri Enstitüsü Dergisi is the property of Dumlupinar University, Institute of Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)