土木外文翻译高温下钢筋混凝土中钢筋性能.docVIP

外文原文： Research Letters in Materials ScienceVolume 2008 (2008), Article ID 814137, 4 pagesdoi:10.1155/2008/814137 Research Letter Properties of Reinforced Concrete Steel Rebars Exposed to High Temperatures ?lker Bekir Top?u and Cenk Karakurt Department of Civil Engineering, Eski?ehir Osmangazi University, 26480 Eski?ehir, Turkey Received 12 February 2008; Accepted 31 March 2008 Academic Editor: Rajiv S. Mishra Copyright ? 2008 ?lker Bekir Top?u and Cenk Karakurt. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Abstract The deterioration of the mechanical properties of yield strength and modulus of elasticity is considered as the primary element affecting the performance of steel structures under fire. In this study, hot-rolled S220 and S420 reinforcement steel rebars were subjected to high temperatures to investigate the fire performance of these materials. It is aimed to determine the remaining mechanical properties of steel rebars after elevated temperatures. Steels were subjected to 20, 100, 200, 300, 500, 800, and 9 5 0 ° C temperatures for 3 hours and tensile tests were carried out. Effect of temperature on mechanical behavior of S220 and S420 were determined. All mechanical properties were reduced due to the temperature increase of the steel rebars. It is seen that mechanical properties of S420 steel was influenced more than S220 steel at elevated temperatures. 1. Introduction Fire remains one of the serious potential risks to most buildings and structures. Since concrete is widely used in construction, research on fire resistance of concrete becomes more and more important. Many researchers all over the world have done some researches on this subject. The mechanical properties of all common building materials decrease with elevation of temperature. The behavior of a reinforced concrete stru