TY - JOUR T1 - EFFECTS OF THERMO-MECHANICAL STRESSES ON THE STRENGTH BEHAVIOR OF CONCRETE IN MACRO SPECIMENS IN FIRE CASE TT - YANGIN DURUMUNDA MAKRO BETON NUMUNELERDE MEYDANA GELEN TERMO-MEKANİK GERİLMELERİN BETON DAYANIMINA ETKİSİ AU - Haksever, Ataman PY - 2018 DA - December Y2 - 2018 JF - Trakya Üniversitesi Mühendislik Bilimleri Dergisi JO - TUJES PB - Trakya Üniversitesi WT - DergiPark SN - 2147-0308 SP - 53 EP - 63 VL - 19 IS - 2 LA - en AB - Rheological research works investigate for firecase the material behavior of small specimens and derive from the test resultsmaterial laws to determine the behavior of structural elements due to fireexposure. However, as it is known, the heat and mass transport processes cansignificantly happen in different phases in macro concrete elements. Besides,in case of a fire, different heating rates occur in the cross section ofstructural elements. The validity of the transferred test results from smalltest specimens to the material behavior of structural elements indicates aphenomenon, which has not been investigated up to now. Such a research work hasbeen done for the first time through close cooperation of subprojects A and B3of SFB (Sonder-ForschungsBereich: A special fire research activity for structuralelements in Braunschweig Technical University, 1971-1986). The results of therheological investigations presented in this paper can lead to a new researchconception about the determination of realistic fire behavior of concretestructures. By means of further purposive research work, it will be possible toreproduce the structural behavior in case of fire with simple but realistic mathematic-rheologicalrelationships. KW - Fire case KW - reinforced concrete KW - macro specimens KW - fire resistance KW - relaxation KW - material behavior N2 - Reolojik araştırma çalışmaları, yangın durumunda, malzemedavranışını belirlemek için küçük boyutlu numuneler kullanmakta ve deneysonuçlarından yapı elemanlarının yangın davranışını belirlemede kullanılacakmalzeme davranış kanunlarını saptamaktadır. Bununla beraber, bilindiği üzere,beton makro elemanlarda ısı ve kütle taşınımları önemli ölçüde farklı fazlardameydana gelmektedir. Küçük numunelerden elde edilmiş olan deney sonuçlarının,yapı elemanlarına tatbikinin geçerliliği, şimdiye kadar araştırılmamış bir fenomenteşkil etmektedir. Böyle bir araştırma çalışması ilk defa SFB ye ait (ÖzelAraştırma Alanı: Braunschweig Teknik Üniversitesi’nde yapı elemanlarının yangındavranışı üzerine özel araştırma aktivitesi) A ve B3 alt araştırma projelerininyakın çalışması sonucunda gerçekleştirilmiştir. Bu çalışmada ortaya konanreolojik araştırma sonuçları, beton yapı elemanlarının gerçekçi yangın durumunubelirlemede yeni bir araştırma kavramına öncelik edebilir. İleride amacayönelik araştırma çalışmalarında yangın durumunda yapı elemanlarının gerçekdavranışını, basit matematik-reolojik bağıntılarla belirlemek mümkün olacaktır. CR - DIN 4102. (1981). Brandverhalten von Baustoffen und Bauteilen (Fire behavior of building materials and structural elements) Teile (Parts) 1-3, Teile (Parts) 5-7, and Teil (Part) 4., DIN Deutsches Institut für Normung E.V., Beuth Verlag, Berlin. CR - Dwaikat, M. B., Kodur, V. K. R. (2008). A numerical approach for modeling the fire induced restraint effects in reinforced concrete beams. Fire Safety Journal, Volume 43, Issue 4, May 2008, Pages 291-307. CR - Gernay, T., Franssen, J. M. (2012). A formulation of the Eurocode 2 concrete model at ele¬vated temperature that includes an explicit term for transient creep. 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CR - Subproject A of SFB: Fire behavior of structural elements & Subproject B3 of SFB: Material behavior of structural elements at elevated tempera¬tures. Technical University Braunschweig, Germany. (1971-1986) UR - https://dergipark.org.tr/tr/pub/tujes/issue//396675 L1 - https://dergipark.org.tr/tr/download/article-file/609865 ER -