Farklı Tipte Korozyon Hasarlı Çelik Bulonlu Birleşimlerin Yapısal Davranışı

Year 2023, Volume: 9 Issue: 1, 37 - 45, 30.04.2023

Yasin Duysak Günnur Yavuz

Abstract

Günümüzde yüksek dayanım, hızlı imalat ve süneklik gibi özelliklerinden dolayı çelik taşıyıcı sistemlerinin kullanımı hızla artmaktadır. Çelik malzemenin üstün özelliklerinin yanında korozyon oluşumu gibi bazı dezavantajları da bulunmaktadır. Çelik taşıyıcı sistemlerde özellikle birleşim bölgelerinde meydana gelen korozyon hasarı büyük öneme sahiptir. Birleşim bölgelerindeki yapısal elemanlarda veya birleşim araçlarında oluşacak büyük bir hasar yapının büyük ölçüde zarar görmesine sebep olabilmektedir. Bu çalışmada, S235 kalitesinde çelikten imal edilmiş 6 mm kalınlığındaki bulonlu birleşimli levhalarda farklı korozyon hasarları oluşması durumunda eksenel çekme kuvveti etkisi altındaki yapısal davranış deneysel olarak incelenmiştir. Bulonlu birleşimli deney numuneleri için sadece bulonda hızlandırılmış korozyon, hem levhada hem bulonda hızlandırılmış korozyon ve sadece bulonda yapay korozyon hasarı olmak üzere 3 farklı tipte korozyon oluşturulmuştur. Korozyon miktarı kütlece %10 malzeme kaybı olacak şekilde üniform veya yapay korozyon olarak oluşturulmuştur. Bulonlu birleşimli levha deney numunelerinde farklı tipte korozyon hasarları için gözlenen yapısal davranış farklılıkları, taşıma kapasitesindeki ve süneklikteki değişimler incelenmiş ve en sünek davranış hem levhada hem bulonda korozyon olan deney numunelerinde elde edilmiştir.

Keywords

Çelik, bulonlu birleşim, korozyon, çekme dayanımı, süneklik

Structural Behavior of Steel Bolted Connections having Different Types of Corrosion Damage

Abstract

Today, the use of steel structural systems is increasing rapidly due to its features such as high strength, fast manufacturing and ductility. Despite to the superlative properties of steel material, there are also some disadvantages like the formation of corrosion. Corrosion damage in steel structural systems, especially in the connection regions, is of great importance. A major damage to the structural members or fasteners in the connection regions can cause serious harms to the structure. In this study, the structural behavior of 6 mm thick bolted joint plates having different corrosion damages which were made of S235 grade steel was investigated experimentally under the effect of axial tensile force. For the bolted connection test specimens three types of corrosion formation methods including accelerated corrosion only on the bolt, accelerated corrosion on both the plate and the bolt, and artificial corrosion damage only on the bolt were applied. The amount of corrosion was formed as uniform or artificial corrosion with a loss of material of 10% by mass. Structural behavior differences, changes in bearing capacity and ductility of bolted connected test specimens were investigated and the most ductile behavior were obtained in test specimens with corrosion on both plate and bolt.

Keywords

steel, bolted connection, corrosion, tensile strength, ductility

References

• [1] G. Qin, S. Xu, D. Yao and Z. Zhang “Study on the degradation of mechanical properties of corroded steel plates based on surface topography,” Journal of Constructional Steel Research, vol. 125, pp. 205–217, October 2016. doi:10.1016/j.jcsr.2016.06.018
• [2] G. Yavuz, Y. Duysak and H. Arisoy, “Corrosion effect on structural behaviour of bolted steel connections under axial tension loads,” European Journal of Environmental and Civil Engineering, published online, May 2022. doi:10.1080/19648189.2022.2081262
• [3] B. Wu, J. Cao and L. Kang, “Influence of local corrosion on behavior of steel I beams subjected to end patch loading: Experiments,” Journal of Constructional Steel Research, vol. 135, pp. 150-161, August 2017. doi:10.1016/j.jcsr.2017.04.020
• [4] S. Saad-Elden, Y. Garbatov and C. Soares, “Strength assessment of a severely corroded box girder subjected to bending moment,” Journal of Consructional Steel Research, vol. 92, pp. 90-102, January 2014. doi:10.1016/j.jcsr.2013.09.010
• [5] J. Ahn, J. You, J. Huh, Y. Jeong and I. Kim, “Residual clamping force of bolt connections caused by sectional damage of nuts,” Journal of Constructional Steel Research, vol. 136, pp. 204-214, September 2017. doi:10.1016/j.jcsr.2017.05.019
• [6] Z. Zhao, H. Zhang, L. Xian and H. Liu, “Tensile strength of Q345 steel with random pitting corrosion based on numerical analysis,” Thin-Walled Structures, vol. 148, 106579, March 2020, doi:10.1016/j.tws.2019.106579
• [7] C. Zhang, H. Zhu and L. Zhu,, “Effect of interaction between corrosion and high temperature on mechanical properties of Q355 structural steel,” Construction and Building Materials, vol. 271, 121605, February 2021. doi:10.1016/j.conbuildmat.2020.121605
• [8] C. Jiang, W. Xiong, C.S. Cai, Y. Zhu and J. Wang, “Preload loss of high-strength bolts in friction connections considering corrosion damage and fatigue loading,” Engineering Failure Analysis, vol. 137, 106416, July 2022. doi:10.1016/j.engfailanal.2022.106416
• [9] I.T. Kim, Y.S. Jeong and D.K. Dao, “Evaluation of tensile strength of painted steel wi local corrosion at structural connections,” Journal of Constructional Steel Research, vol. 177, 106449, February 2021. doi:10.1016/ j.jcsr.2020.106449
• [10] M. Koçer, M. Öztürk and A. Boğa, “Analytical Study on the Effect of Corrosion to the Construction Performance,” Natural and Engineering Sciences, vol. 4, pp. 11-20, January 2019, doi:10.28978/nesciences.522364
• [11] ASM Handbook, Volume 13A. “Corrosion: Fundamentals, testing, and protection”. ASM International, 2003.
• [12] Y. Duysak, 2019, “Investigation of corrosion effect on bolted and welded connections in steel structures” MSc thesis, Konya Technical University, Institute of Graduate Studies, Konya, Türkiye, 2019.