سنجش نقش چیدمان المان‌ها در توزیع یکنواخت تنش در سیستم مهاربندی پشتیبان‌ قوی با مهاربند فولادی

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

گروه مهندسی عمران، دانشکده مهندسی گرگان، دانشگاه گلستان

چکیده

قاب مهاربندی پشتیبان ‌قوی ازجمله سیستم‌های نوین معرفی شده به‌منظور جلوگیری از مکانیزم طبقه نرم است. در این سیستم، با استفاده از یک خرپا الاستیک نیازهای لرزه‌ای را در ارتفاع طبقه توزیع کرده و از تشکیل طبقه نرم جلوگیری می‌کند. باوجود رفتار مناسب این سیستم در مطالعات صورت گرفته، این مطالعات محدود بوده و جنبه‌های مختلف مؤثر بر طراحی این سیستم نیازمندی بررسی بیشتر است. در این مطالعه، پیکربندی‌های متفاوت خرپا الاستیک و مهاربندهای ناحیه غیرارتجاعی مورد بررسی قرار گرفته تا اثرات آن در رفتار سازه و توزیع نیروهای ایجاد شده در اعضای خرپا الاستیک تحت بارگذاری استاتیکی چرخه‌ای ارزیابی شود. نتایج این مطالعه بیانگر آن بود که استفاده از قید تسیلم‌شونده می‌تواند موجب کاهش نیرو تا 30% در سایر اعضای خرپا الاستیک شود اما بعد از کمانش، موجب تجمع تغییرشکل تا 30% در یک طبقه می‌شود و نیروی سایر اعضا را افزایش می‌دهد. استفاده از قید تسیلم‌شونده در طبقه اول، ضمن افزایش مقاومت سازه، نیروی ایجاد شده در قیدها را تا 30% کاهش داده اما موجب افزایش نیروی آپلیفت ستون تا 20% می‌شود. ارزیابی پیکربندی‌های متفاوت بیانگر آن بود که استفاده از پیکربندی هفتی و هشتی موجب افزایش قابل‌توجه نیرو در اعضای خرپا الاستیک تا 100% شده است که می‌توان با استفاده از قیدهای تسلیم شونده، نیروهای ایجاد شده در خرپا الاستیک را تا میزان 50% کاهش داد.کاهش طول ناحیه غیرارتجاعی، موجب گسیختگی سریع‌تر مهاربندها و درنتیجه افت مقاومت قابل توجه در تغییر مکان‌های بالا می‌شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Assessment of the Role of Element Arrangement in Uniform Stress Distribution within the StrongBack Braced System with Steel Brace

نویسندگان [English]

  • Aryan Fatahzadeh
  • Ali Biglari Fadafan
Faculty of Engineering, University of Golestan, Golestan, Iran
چکیده [English]

The steel concentrically braced frame (CBF) is among the most widely used structural systems, offering economic efficiency, adequate stiffness, and high strength. However, despite these advantages, the system exhibits several critical limitations. One of the main issues is that brace buckling frequently leads to a reduction in ductility, energy dissipation capacity, and a significant decrease in strength and stiffness, often resulting in the formation of a soft-story mechanism. To overcome this problem, the strongback braced frame has been introduced in recent years as a solution. This system comprises an elastic truss, which promotes uniform lateral deformation along the height of the structure, and a nonlinear segment, which is responsible for yielding behavior and energy dissipation. This study presents a numerical investigation of the impact of different strongback system configurations on structural performance. Initially, the modeling approach is validated by comparing it with existing experimental and numerical results. Once validated, cyclic analyses are carried out on various models to assess their behavior. The evaluation of system configuration is organized into three parts: (1) analyzing the effect of yielding ties, (2) examining the arrangement of elastic and inelastic braces, and (3) studying the influence of bay geometry on the overall performance of the strongback frame.

کلیدواژه‌ها [English]

  • Strongback Braced Frame
  • cyclic static loading
  • elastic truss
  • soft story
Blebo FC, Roke DA, “Seismic-resistant self-centering rocking core system”, Engineering Structures, 2015, 101, 193-204. https://doi.org/10.1016/j.engstruct.2015.07.016
Chen C-H, Mahin SA, Performance-Based Seismic Demand Assessment of Concentrically Braced Steel Frame Buildings, 2012.
Chen X, Takeuchi T, Matsui R, “Seismic performance and evaluation of controlled spine frames applied in high-rise buildings”, Earthquake Spectra, 2018, 34, 1431-1458. https://doi.org/10.1193/080817EQS157M
Faramarzi MS, Taghikhany TA, “Comparative performance-based seismic assessment of strongback steel braced frames”, Journal of Building Engineering, 2021 44. https://doi.org/10.1016/j.jobe.2021.102983
Faramarzi MS, Taghikhany T, “Direct performance-based seismic design of strongback steel braced systems, in: Structures”, Elsevier, 2020, 482-495.
Hu S, Wang W, Qu B, Alam MS, “Development and validation test of a novel Self-centering Energy-absorbing Dual Rocking Core (SEDRC) system for seismic resilience”, Engineering Structures, 2020, 211. https://doi.org/10.1016/j.engstruct.2020.110424
Kazemzadeh Azad S, Topkaya C, “A review of research on steel eccentrically braced frames”, Journal of Constructional Steel Research, 2017. https://doi.org/10.1016/j.jcsr.2016.07.032
Kazemzadeh Azad S, Topkaya C, Astaneh-Asl A, “Seismic behavior of concentrically braced frames designed to AISC341 and EC8 provisions”, Journal of Constructional Steel Research, 2017, 133, 383-404. https://doi.org/10.1016/j.jcsr.2017.02.026
Khatib IF, Mahin SA, Pister KS, “Seismic behavior of concentrically braced steel frames”, Earthquake Engineering Research Center, University of California Berkeley, 1988.
Kiggins S, Uang CM, “Reducing residual drift of buckling-restrained braced frames as a dual system”, Engineering Structures, 2006, 28, 1525-1532. https://doi.org/10.1016/j.engstruct.2005.10.023
Lai J-W, “Experimental and analytical studies on the seismic behavior of conventional and hybrid braced frames”, Ph. D. Thesis, UC Berkeley, 2012.
Lai J-W, Mahin SA, “Strongback system: a way to reduce damage concentration in steel-braced frames”, Journal of Structural Engineering, 2015, 141, 1-11. https://doi.org/10.1061/(asce)st.1943-541x.0001198
Li G, Dong Z-Q, Li H-N, “simplified collapse-prevention evaluation for the reserve system of low-ductility steel concentrically braced frames”, Journal of Structural Engineering, 2018 144. https://doi.org/10.1061/(asce)st.1943-541x.0002062
Majumerd MJE, Dehcheshmeh EM, Broujerdian V, Moradi S, “Self-centering rocking dual-core braced frames with buckling-restrained fuses”, Journal of Constructional Steel Research, 2022, 194. https://doi.org/10.1016/j.jcsr.2022.107322
Martin A, Deierlein GG, “Generalized modified modal superposition procedure for seismic design of rocking and pivoting steel spine systems”, Journal of Constructional Steel Research, 2021, 183. https://doi.org/10.1016/j.jcsr.2021.106745
Martini K, Amin N, Lee PL, Bonowitz D, “The potential role of non-linear analysis in the seismic design of building structures, in: Proc”, 4th US National Conference on Earthquake Engineering, 1990, 67-76.
Mazzoni S, McKenna F, Scott MH, Fenves GL, “OpenSees command language manual”, Pacific Earthquake Engineering Research (PEER) Center, 2006, 264, 137-158.
Rossi PP, Lombardo A, “Influence of the link overstrength factor on the seismic behaviour of eccentrically braced frames”, Journal of Constructional Steel Research, 2007, 63, 1529-1545. https://doi.org/10.1016/j.jcsr.2007.01.006
Simpson BG, “Higher-mode force response in multi-story strongback-braced frames”, Earthquake Engineering and Structural Dynamics, 2020. https://doi.org/10.1002/eqe.3310
Simpson BG, Mahin SA, “Experimental and numerical investigation of strongback braced frame system to mitigate weak story behavior”, Journal of Structural Engineering, 2018, 144, 1-14. https://doi.org/10.1061/(asce)st.1943-541x.0001960
Simpson BG, Rivera Torres D, “Simplified modal pushover analysis to estimate first- and higher-mode force demands for design of strongback-braced frames”, Journal of Structural Engineering, 2021, 147. https://doi.org/10.1061/(asce)st.1943-541x.0003163
Takeuchi T, Chen X, Matsui R, “Seismic performance of controlled spine frames with energy-dissipating members”, Journal of Constructional Steel Research, 2015, 114, 51-65. https://doi.org/10.1016/j.jcsr.2015.07.002
Tremblay R, Chen L, Tirca L, “High-rise buildings enhancing the seismic performance of multi-storey buildings with a modular tied braced frame system with added energy dissipating devices”, International Journal of High-Rise, 2014.
Uriz P, Mahin SA, “Toward earthquake-resistant design of concentrically braced steel-frame structures”, University of California, Berkeley, Berkeley, USA, 2008.
Wiebe L, Christopoulos C, Tremblay R, Leclerc M, “Mechanisms to limit higher mode effects in a controlled rocking steel frame 1: Concept, modelling, and low-amplitude shake table testing”, Earthquake Engineering and Structural Dynamics, 2013, 42, 1053-1068. https://doi.org/10.1002/eqe.2259
Zhou Y, Shao H, Cao Y, Lui EM, “Application of buckling-restrained braces to earthquake-resistant design of buildings: A review”, Engineering Structures, 2021. https://doi.org/10.1016/j.engstruct.2021.112991
Zhu L, Zhao C, “Self-Centering steel frame systems for seismic-resistant structures”, Advances in Civil Engineering, 2020. https://doi.org/10.1155/2020/8859881