مهندسی سازه و ساخت

مهندسی سازه و ساخت

بررسی آزمایشگاهی اثر استفاده از سختکننده در اتصالات فولادی T-stub تحت بارگذاری چرخهای

نوع مقاله : علمی - پژوهشی

نویسندگان
مهرداد رسولی تبار 1
مهرزاد تحملی رودسری 2
پرهام معمارزاده 3
فرشید فتحی 4
1 دانشجوی دکتری، گروه مهندسی عمران، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران.
2 دانشیار، گروه مهندسی عمران، واحد کرمانشاه، دانشگاه آزاد اسلامی، کرمانشاه، ایران.
3 دانشیار، گروه مهندسی عمران، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران.
4 استادیار، گروه مهندسی عمران، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران.
10.22065/jsce.2024.451453.3386
چکیده
اتصالات در سازههای فولادی از مهمترین بخشهای سامانه باربری در ساختمانها میباشند. اتصالات دارای سپری با پیچ و مهره به دلیل عدم استفاده از جوش در اجزای اتصال از اهمیت ویژهای برخوردارند. به منظور بهبود پارامترهای لرزهای در این نوع اتصال، در این تحقیق استفاده از یک سختکننده در سپری اتصال T-stub پیشنهاد شده است. سه نمونه آزمایشگاهی با مقیاس واقعی برای بررسی طرح پیشنهادی ساخته شده و در آزمایشگاه مورد بارگذاری قرار گرفتند. در این تحقیق بارگذاری بصورت چرخهای و شبه استاتیکی به نمونههای آزمایشگاهی اعمال گردید. نمودار چرخه‌ای برای نمونههای آزمایشگاهی بدست آمد و براساس آن نمودار استخوانی و دوخطی معادل ترسیم شدند. براساس نمودار دوخطی معادل، پارامترهای لرزهای برای نمونهها محاسبه و مقایسه شدند. نمونه اول بر اساس روش طراحی ارائه شده در آئین نامه ANSI/AISC 358-16 ساخته شده و در نمونه های بعدی سختکننده مورد نظر با دو ضخامت متفاوت 8 و 10 میلیمتری به اتصال اضافه شد. نتایج آزمایشات مورد بررسی قرار گرفته و پارامترهای لنگر نهایی، سختی مؤثر، شکلپذیری، و ظرفیت اتلاف انرژی محاسبه و ارزیابی شدند. نتایج نشان دادند که اضافه کردن سختکننده به اتصال T-stub باعث ارتقای عملکرد لرزهای اتصال و ارتقای پارامتر های لرزه ای شده است. نتایج نشان دادند که در نمونه‌های دارای سخت کننده با ضخامت 8 و 10 میلیمتری لنگر نهایی به ترتیب حدودا 9% و 14% افزایش داشته است؛ سختی موثر به ترتیب 44% و 92% و ظرفیت اتلاف انرژی 54% و 67% ارتقا یافته‌اند. همچنین شکل پذیری برای نمونه‌های دارای سخت کننده به ترتیب 12% و 58% رشد داشته‌اند. نتایج همچنین نشان دادند که ضخامت سخت کننده تاثیر قابل توجهی بر رفتار اتصال پیشنهادی دارد.
کلیدواژه‌ها
اتصالات فولادی
T-stub
لنگر نهایی
شکل پذیری
ظرفیت اتلاف انرژی
سخت کننده فولادی
تست آزمایشگاهی

موضوعات

عنوان مقاله English

Experimental Study of the Effect of Using Stiffener in T-stub Steel Connections Under Cyclic Loading

نویسندگان English

Mehrdad RasouliTabar 1
Mehrzad TahamouliRoudsari 2
Parham Memarzadeh 3
Farshid Fathi 4
1 Ph. D. Student, Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
2 Associate Professor, Department of Civil Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran
3 Associate Professor, Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran.
4 Assistant Professor, Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran.
چکیده English

Connections in steel structures are one of the most important parts of the load-carrying system in buildings. T-stub connections are particularly important due to the absence of welding in connection components. To improve the seismic parameters in this type of connection, the use of a stiffener in the T-stub connection Tee section is proposed in this research. Three full-scale experimental specimens were constructed and tested in the laboratory to evaluate the proposed design performance. In this research, cyclic and quasi-static loading was applied to experimental specimens. The hysteresis diagram was obtained for the laboratory samples and based on that, the backbone diagram and the equivalent bilinear diagram were drawn. Based on the equivalent bilinear diagram, seismic parameters for the samples were calculated and compared. The first sample was designed and constructed based on the design method provided in the ANSI/AISC 358-16 regulations. In the subsequent samples, the desired stiffener with two different thicknesses of 8 and 10 mm was added to the connection. The results of the tests were analysed and the ultimate moment, effective stiffness, ductility, and energy dissipation capacity parameters were calculated and evaluated. The results demonstrated that adding the stiffener to the T-stub connection enhanced the seismic performance of the connection. The results indicated that in samples with 8 and 10 mm stiffener thickness, the ultimate moment increased by 9% and 14%, respectively; The effective stiffness has been improved by 44% and 92%, and the energy dissipation capacity by 54% and 67%, respectively. Also, the plasticity for samples with stiffeners has grown by 12% and 58%, respectively. The results also demonstrated that the thickness of the stiffener has a significant effect on the behavior of the proposed connection.

کلیدواژه‌ها English

Steel connection
T-stub
Ultimate moment
Ductility
Energy dissipation capacity
Steel stiffener
Experimental test
 [1] de la Croix Kombate, T. J. Taşkın, K. (2022). State-of-the-art review on the behaviour of T-stubs and prying action. Journal of Constructional Steel Research, 191, 107203.https://doi.org/10.1016/j. jcsr. 2022.107203
[2] Piluso, V. Faella, C. Rizzano, G. (2001). Ultimate behavior of bolted T-stubs. I: Theoretical model. Journal of structural engineering, 127(6), 686-693.https://doi.org/10.1061/(ASCE)0733-9445(2001)127:6(686)
[3] Hu, D. Papadopoulos, J. Adams, G. G. (2020). Prying action in an elastic T-stub tensile connection. Journal of Constructional Steel Research, 169, 106027.https://doi.org/10.1016/j. jcsr. 2020.106027
[4] Bezerra, L. M. Bonilla, J. Freitas, C. S. Massicotte, B. (2022). Behavior of T-stub steel connections bolted to rigid bases. Journal of Constructional Steel Research, 192, 107242.https://doi.org/10.1016/j. jcsr. 2022.107242
[5] Hu, J. W. Leon, R. T. Park, T. (2012). Mechanical models for the analysis of bolted T-stub connections under cyclic loads. Journal of Constructional Steel Research, 78, 45-57.https://doi.org/10.1016/j. jcsr. 2012.05.011
[6] Kong, Z. Kim, S. E. (2018). Numerical estimation for initial stiffness and ultimate moment of T-stub connections. Journal of Constructional Steel Research, 141, 118-131.https://doi.org/10.1016/j. jcsr. 2017.11.008
[7] Lyu, J. Yan, S. He, S. Zhao, X. Rasmussen, K. (2023). Mechanical model for the full range behaviour of bolted T-stubs. Journal of Constructional Steel Research, 200, 107652.https://doi.org/10.1016/j. jcsr. 2022.107652
[8] Park, H. Y. Oh, S. H. (2019). Design range of the damper of a T-stub damage-controlled system. Journal of Constructional Steel Research, 162, 105719.https://doi.org/10.1016/j. jcsr. 2019.105719
[9] ANSI/AISC 358-16, Prequalified Connections for Special and Intermediate Steel Moment Frames for Seismic Applications, American Institute of Steel Construction, Chicago, IL, USA, 2016.
[10] Herrera, R. A. Bravo, M. Gómez, G. Aedo, G. (2013). Performance of built-up T-stubs for Double T moment connections. Journal of Constructional Steel Research, 88, 289-295.https://doi.org/10.1016/j. jcsr. 2013.05.022
[11] Bravo, M. A. Herrera, R. A. (2014). Performance under cyclic load of built-up T-stubs for Double T moment connections. Journal of Constructional Steel Research, 103, 117-130.https://doi.org/10.1016/j. jcsr. 2014.08.005
[12] Herrera, R. Salas, C. Beltran, J. F. Nuñez, E. (2017). Experimental performance of double built-up T moment connections under cyclic loading. Journal of Constructional Steel Research, 138, 742-749.https://doi.org/10.1016/j. jcsr. 2017.08.022
[13] Liang, G. Guo, H. Liu, Y. Li, Y. (2018). Q690 high strength steel T-stub tensile behavior: Experimental and numerical analysis. Thin-Walled Structures, 122, 554-571.https://doi.org/10.1016/j. tws. 2017.10.042
[14] Hantouche, E. G. Abboud, N. H. (2014). Stiffness modeling of bolted thick built-up T-stub connections including secondary prying effect. Journal of Constructional Steel Research, 95, 279-289.https://doi.org/10.1016/j. jcsr. 2013.12.012
[15] Chen, Z. Gao, F. Wang, Z. Lin, Q. Huang, S. Ma, L. (2023). Performance of Q690 high-strength steel T-stub under monotonic and cyclic loading. Engineering Structures, 277, 115405.https://doi.org/10.1016/j. engstruct. 2022.115405
[16] Wang, M. Dong, K. Liu, M. (2020). Damage control mechanism and seismic performance of a steel moment connection with replaceable low-yield-point steel double T-stub fuses. Thin-Walled Structures, 157, 107143.https://doi.org/10.1016/j. tws. 2020.107143
[17] Hantouche, E. G. Kukreti, A. R. Rassati, G. A. (2012). Investigation of secondary prying in thick built-up T-stub connections using nonlinear finite element modeling. Engineering structures, 36, 113-122.https://doi.org/10.1016/j. engstruct. 2011.11.030
[18] Qin, Y. Shu, G. P. Wang, W. (2020). Seismic behavior of self-centering steel connections with friction T-stubs. Journal of Constructional Steel Research, 173, 106263.https://doi.org/10.1016/j. jcsr. 2020.106263
[19] Saberi, V. Gerami, M. Kheyroddin, A. (2014). Comparison of bolted end plate and T-stub connection sensitivity to component thickness. Journal of Constructional Steel Research, 98, 134-145.https://doi.org/10.1016/j. jcsr. 2014.02.012
[20] Garoosi, A. M. TahamouliRoudsari, M. Hashemi, B. H. (2018, November). Experimental evaluation of rigid connection with reduced section and replaceable fuse. In Structures (Vol. 16, pp. 390-404). Elsevier. https://doi.org/10.1016/j. istruc. 2018.11.010
[21] Tahamouli Roudsari, M. Sohaei, S. Torkaman, M. Alizadeh, A. Safaee, S. Haghaninia, A. MohammadiMajd, M. (2021). Experimental investigation of I-shaped beam to circular column rigid connection with stiffened and non-stiffened channel link. Journal of Earthquake Engineering, 25(13), 2605-2627.https://doi.org/10.1080/13632469.2019.1628129
[22] Garoosi, A. R. M. Roudsari, M. T. Torkaman, M. Bonyadirad, S. Saeedmanesh, A. Lotfi, H. R. , ... & Alipour, A. (2021). Introducing new rigid I-beam to box column connections by using a stiffened channel link. Steel and Composite Structures, An International Journal, 41(4), 533-548.
[23] Garfamy, H. M., Abar, B. M., & D'Aniello, M. (2023). Seismic response of CFST Double-Tee moment connections: Design criteria and experimental tests. Engineering Structures, 293, 116670. https://doi.org/10.1016/j.engstruct.2023.116670
[24] Ajwad, A., Di Benedetto, S., Latour, M., & Rizzano, G. (2024). A COMPONENT METHOD APPROACH FOR SINGLE-SIDED BEAM-TO-COLUMN JOINTS WITH CHS COLUMN AND WELDED DOUBLE-TEE BEAM. Thin-Walled Structures, 112055. https://doi.org/10.1016/j.tws.2024.112055
[25] Khani, R., Hosseinzadeh, Y., & Asl, M. H. (2023). Investigating the prying force magnitude and location in the T-stub connection based on the energy method. Engineering Structures, 280, 115655. https://doi.org/10.1016/j.engstruct.2023.115655
[26] Di Benedetto, S., Francavilla, A. B., Latour, M., & Rizzano, G. (2024). Seismic behaviour of a steel moment resisting frame structure featuring hourglass double split tee joints. Soil Dynamics and Earthquake Engineering, 180, 108616. https://doi.org/10.1016/j.soildyn.2024.108616
[27] American Society for Testing and Materials, A370–02.(2002). Standard test methods and definitions for mechanical testing of steel products. Philadelphia: American Society for Testing and Materials.
[28] ATC-24.(1992). "Guidelines for cyclic seismic testing of components of steel structures". ATC-24, Redwood City, CA
[29] FEMA, A. (2005). 440, Improvement of nonlinear static seismic analysis procedures. FEMA-440, Redwood City.
[30] FEMA-356.: Prestandard and Commentary for the Seismic Rehabilitation of Buildings American Society of Civil Engineers (2000)

  • تاریخ دریافت 18 خرداد 1403
  • تاریخ بازنگری 29 مرداد 1403
  • تاریخ پذیرش 16 آبان 1403