Effect of Beam Properties on the Seismic Behavior of RBS Connections
Subject Areas : Analysis of Structure and Earthquake
1 - Department of Civil Engineering, Bilehsavar-e-Moghan Branch, Islamic Azad University, Bilehsavar, Iran
Keywords: steel connection, reduced beam section, finit element analysis, cyclic loading ,
Abstract :
The reduced beam section (RBS) moment connection is one of the prequalified connection types specified in design standards. The main concept of this connection is to weaken the beam by cutting portions of its flange near the column, so that a plastic hinge forms in this region, allowing it to act as a ductile fuse. However, at large displacements, there is a possibility of web buckling, which in turn leads to strength degradation at high rotation levels. In this study, the cyclic performance of the RBS moment connection under variations in beam cross section and length was investigated using the ABAQUS finite element software. The analysis results showed that the rate of strength degradation at higher rotation levels is greater for beams with larger cross sections compared to beams with smaller cross sections. Moreover, increasing the beam length reduces the rate of strength degradation in the connection.
[1] Engelhardt MD. Design of reduced beam section moment connections. In: Proceedings of the 1999 North American Steel Construction Conference; 1999. Chicago (IL): American Institute of Steel Construction. https://www.aisc.org/globalassets/modern-steel/archives/1999/11/1999v11_design.pdf
[2] Engelhardt MD, Winneberger T, Zekany AJ, Potyraj TJ. The dogbone connection: Part II. Mod Steel Constr. 1996;36(8):46–55.
https://www.aisc.org/globalassets/modern-steel/archives/1996/08/1996v08_dogbone_2.pdf
[3] Yu QSK, Uang CM, Gross J. Seismic rehabilitation design of steel moment connection with welded haunch. J Struct Eng. 2000;126(1):69 78. https://doi.org/10.1061/(ASCE)0733-9445(2000)126:1(69)
[4] Haji Rajabi MJ, Karimi MS, Kafi MA. A new model for beam rigid connection to double I-shaped column’s web. J Constr Steel Res. 2016;127:204 20. https://doi.org/10.1016/j.jcsr.2016.07.013
[5] Plumier A. New idea for safe structures in seismic zones. In: IABSE Symposium – Mixed Structures Including New Materials; 1990. Zürich (Switzerland): International Association for Bridge and Structural Engineering. https://www.iabse.org
[6] Rahnavard R, Hassanipour A, Siahpolo N. Analytical study on new types of reduced beam section moment connections affecting cyclic behavior. Case Stud Struct Eng. 2015; 3:33 51. https://doi.org/10.1016/j.csse.2015.02.002
[7] Ashtari P, Naseri R. Introduce an innovative connection with tubular flange section. In: Proceedings of the 8th International Conference on Seismology & Earthquake Engineering; 2019 May; Tehran, Iran. Tehran (Iran): International Institute of Earthquake Engineering and Seismology (IIEES). https://www.iiees.ac.ir/en/
]8[ اشتری پ، ناصری ر. بررسی امکان استفاده از پروفیل‌های تسلیم شونده در اتصالات خمشی. در: مجموعه مقالات سیزدهمین کنگره ملی مهندسی عمران؛ 1401 اردیبهشت؛ اصفهان، ایران. اصفهان (ایران): دانشگاه صنعتی اصفهان https://civilcongress.ir/
]9 [اشتری پ، ناصری ر. ارزیابی رفتار لرزه‌ای اتصال تیر با بال لوله‌ای در قاب‌های خمشی فولادی. در: مجموعه مقالات ششمین کنفرانس بین‌المللی مهندسی سازه؛ 1401 آبان؛ تهران، ایران. تهران (ایران): دانشگاه صنعتی امیرکبی https://www.aut.ac.ir
[10] ANSI/AISC 358-22. Prequalified connections for special and intermediate steel moment frames for seismic applications. Chicago (IL): American Institute of Steel Construction; 2022. https://www.aisc.org/aisc358
[11] Lee CH, Jeon SW, Kim JH, Uang CM. Effects of panel zone strength and beam web connection method on seismic performance of reduced beam section steel moment connections. J Struct Eng. 2005;131(12):1854 65. https://doi.org/10.1061/(ASCE)0733-9445(2005)131:12(1854)
[12] Pachoumis D, Galoussis EG, Kalfas CN, Efthimiou IZ. Cyclic performance of steel moment resisting connections with reduced beam sections—experimental analysis and finite element model simulation. Eng Struct. 2010;32(9):2683 92. https://doi.org/10.1016/j.engstruct.2010.04.007
[13] ANSI/AISC 341-22. Seismic provisions for structural steel buildings. Chicago (IL): American Institute of Steel Construction; 2022. https://www.aisc.org/aisc341
[14] SAC Joint Venture; FEMA. Recommended seismic design criteria for new steel moment frame buildings. Washington (DC): Federal Emergency Management Agency; 2000. Report No.: FEMA 350. https://www.fema.gov/sites/default/files/documents/fema_fema-350.pdf
