ارزیابی عملکرد لرز ه ای قاب های بتن مسلح به همراه بررسی شاخص مقاومت در برابر خرابی پیشرونده با روش مسیر جایگزین

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، گروه مهندسی عمران، واحد ارومیه، دانشگاه آزاد اسلامی، ارومیه، ایران

2 دانشجوی دکتری، گروه مهندسی عمران، واحد ارومیه، دانشگاه آزاداسلامی، ارومیه، ایران

چکیده

خرابی پیش‌ رونده، گسترش زنجیروار خرابی از یک عضو به عضوی دیگر در یک سازه است که درنهایت باعث فروریزی کل یا انهدام بخش بزرگی از سازه می‌ گردد. در این مقاله به بررسی خرابی پیش‌رونده در دو سازه بتن مسلح با تعداد طبقات مختلف (ساختمان‏های 10 و 16 طبقه) با استفاده از تحلیل دینامیکی غیرخطی پرداخته ‌شده است. مدل‌سازی با ایجاد خرابی موضعی در ستون میانی و ستون گوشه تحت اثر سه شتاب‌ نگاشت مختلف انجام‌ شده است. تغییرمکان نسبی طبقات، شاخص مقاومت بر اساس حداکثر برش پایه وارده و شکل‌گیری مفاصل پلاستیک و امکان ایجاد خرابی پیش‌رونده بر اساس استانداردهای موجود و طراحی بر اساس روش مسیر جایگزین دستورالعمل GSA مورد بررسی قرارگرفته و نتایج حاصل نشان می‌دهد که در ساختمان‌های بتن‌آرمه قاب خمشی ستون‌های میانی بیشترین پتانسیل خرابی پیش‌رونده را دارند و همچنین سازه‌های با ارتفاع بیشتر عملکرد بهتری در برابر خرابی پیش‌رونده از خود نشان می‌دهند.

کلیدواژه‌ها

عنوان مقاله [English]

Assessment of Seismic Performance of RC Frames and the Evaluation of Robustness Index for Progressive Collapse with Alternative Path Method

نویسندگان [English]

  • Ashkan KhodaBandehLou 1
  • Sajad Beyza Ghalghachi 2
1 Assistant Professor of the Faculty of Engineering, Civil Engineering Department, Urmia Branch, Islamic Azad University, Urmia, Iran
2 Ph.D. Student, Civil Engineering Department, Faculty of Engineering, Urmia Branch, Islamic Azad University, Urmia, Iran
چکیده [English]

Progressive failure is the spread of a chain of damage from one member to another in a structure that, following local damage caused by the removal of one or more load-bearing members, begins and is disproportionately transferred to the other members of the structure. The whole or destruction becomes a large part of the structure. In the discussion of progressive failure, determining the element that has the greatest potential for progressive failure is important. Because by strengthening this element, the performance of the structure can be improved. In this paper, the progressive failure of two reinforced concrete structures with a different number of floors (10 and 16-storey buildings) using nonlinear dynamic analysis is investigated. The analysis and design of this structure has been done in SAP 2000 software and modeling has been done by creating local failure in the middle column and corner column under the influence of three different acceleration angles. The relative displacement of the floors, the viscosity index based on the maximum base cut and the formation of plastic joints, and the possibility of progressive failure based on existing standards and design based on the GSA guideline alternative method have been investigated. The results of this study show that in reinforced concrete buildings, the bending frame of the corner columns has the highest potential for progressive failure. In addition, the results show that structures with higher heights perform better against progressive failure.

کلیدواژه‌ها [English]

  • Progressive Collapse
  • Reinforced Concrete Frames
  • Structural Robustness Index
  • Nonlinear Dynamic Analysis

مراجع

[1] Gsa U. Progressive collapse analysis and design guidelines for new federal office buildings and major modernization projects. Washington, DC (2003).
[2] DoD.. Design of buildings to resist progressive collapse: Unified Facilities Criteria (UFC), DOD Washington, DC. (2013)
[3] Ellingwood BR. Mitigating Risk from Abnormal Loads and Progressive Collapse. J Perform Constr Facil 2006;20:315–23. doi:10.1061/(ASCE) 0887-3828(2006)20:4(315).
[4] Alashker Y, Li H, El-Tawil S. Approximations in Progressive Collapse Modeling. J Struct Eng (2011);137:914–24. doi:10.1061/(ASCE)ST.1943-541X.0000452.
[5] Liu Y. Progressive-failure analysis of steel building structures under abnormal loads. A Thesis Degree Dr Philsophy, Waterloo, Univ Waterloo (2007).
[6] Lu X, Lin K, Gu D, Li Y. Experimental Study of Novel Concrete Frames Considering Earthquake and Progressive Collapse. Concr. Struct. Earthq., Singapore: Springer Singapore; (2019), p. 29–45. doi:10.1007/978-981-13-3278-4_3.
[7] Eren N, Brunesi E, Nascimbene R. Influence of masonry infills on the progressive collapse resistance of reinforced concrete framed buildings. Eng Struct (2019);178:375–94. doi:10.1016/j.engstruct.2018.10.056.
[8] Ferraioli M. Dynamic Increase Factor for Nonlinear Static Analysis of RC Frame Buildings Against Progressive Collapse. Int J Civ Eng (2019);17:281–303. doi:10.1007/s40999-017-0253-0.
[9] Jahangir, H., Karamodin, A., Structural Behavior Investigation Based on Adaptive Pushover Procedure 10th International Congress on Civil Engineering, University of Tabriz, Tabriz, Iran (2015).
[10] Ellingwood BR. Load and resistance factor criteria for progressive collapse design. Natl. Work. Prev. Progress. Collapse. Rosemont, Illinois. USA Natl. Inst. Build. Sci., (2002).
[11] Jahangir, H., Bagheri, M. “Evaluation of Seismic Response of Concrete Structures Reinforced by Shape Memory Alloys” International Journal of Engineering, 2020; 33(3): 410-418. DOI: 10.5829/IJE.2020.33.03C.05.
[12] Bagheri, M., Chahkandi, A., and Jahangir, H., "Seismic Reliability Analysis of RC Frames Rehabilitated by Glass Fiber-Reinforced Polymers" International Journal of Civil Engineering, 2019; 17: 1785–1797. DOI: 10.1007/s40999-019-00438-x.
[13] Shan L, Petrone F, Kunnath S. Robustness of RC buildings to progressive collapse: Influence of building height. Eng Struct (2019);183:690–701. doi:10.1016/j.engstruct.2019.01.052.
[14] Abbasi S, Mirza’i R. Evaluation of the seismicity of concrete buildings relative to the type of failure indicators and fragility curve drawing. 2nd Int Conf New Res Find Civ Eng Archit Urban Manag TehranUniversity Appl Sci (2016) (in Persian) .
[15] Sadeghi, A. Kazemi H. Evaluation and review of Damage Index failure theory in steel and concrete buildings. The 2nd National Conference on Research and Educational Development of Iran’s Urban and Environmental Architecture, . Tehran,Permanent Secretariat of the Conference. (2016).
[16] Tavakoli H, Akbarpour S. Determination of the strength of concrete flexural frame under progressive collapse using Robustness Index. Paper presented at the Sixth National Congress on Civil Engineering, Semnan, semnan university. (2010) (in Persian).
[17] MehrabI F, Kheiroddin A, GeramI M. Assessment of progressive collapse potential of steel structures thatdesigned on iran code.civil engineering. (2015). 2-28(4), 65-72. (in Persian).
[18] Frangopol DM, Curley JP. Effects of Damage and Redundancy on Structural Reliability. J Struct Eng (1987) ;113:1533–49. doi:10.1061/(ASCE)0733-9445(1987)113:7(1533).
[19] Ito T, Ohi K, Li Z. A sensitivity analysis related to redundancy of framed structures subjected to vertical loads. J Struct Constr Eng Trans AIJ (2005):145–51.
[20] Kim J, An D. Evaluation of progressive collapse potential of steel moment frames considering catenary action. Struct Des Tall Spec Build (2009);18:455–65. doi:10.1002/tal.448.
[21] Ito T, Fukuyama T. A Potential Strength and Ultimate Behavior of Framed Structures Considering Catenary Effects after Failure Mechanism Formation Subjected to Vertical Load. Theor Appl Mech Japan (2011);59:29–38.
[22] Choi JH, Ito M, Ohi K. Prevention of Building Structural Collapse Caused by Accidental Events. proc. 2nd Int. Symp. Improv. Struct. Saf. Build. Struct., (2007), p. 85–98.
[23] Kim K. Evaluation of progressive collapse resisting capacity of tall buildings (2012).
[24] Ito T, Takemura T. Sensitivity Analysis of Redundancy of Regular and Irregular Framed. Int J High-Rise Build (2014);3:297–304.
[25] Abbasnia R, YoosefpooravandarI A. Progressive collapse resistance of RC framed buildings with defferent ductilites. Sharif Journal of Civil Engineering, (2016). 32.2(2.2), 3-10. (in Persian) .
[26] Jahangir, H., Daneshvar Khorram, M.H., Ghalehnovi, M., “Influence of Geometric Parameters on Perforated Core Buckling Restrained Braces Behavior (In Persian)” Journal of Structural and Construction Engineering, (2018),  doi:10.22065/jsce.2018.101904.1359.
[27] Agency, F. E. M. (2000). Prestandard and commentary for the seismic rehabilitation of buildings. American Society of Civil Engineers (ASCE).
[28] Kim J, Kim T. Assessment of progressive collapse-resisting capacity of steel moment frames. J Constr Steel Res (2009) 65:169–79. doi:10.1016/j.jcsr.2008.03.020.
[29] Khandelwal K, El-Tawil S. Pushdown resistance as a measure of robustness in progressive collapse analysis. Eng Struct (2011);33:2653–61. doi:10.1016/j.engstruct.2011.05.013.
[30] Management and Planning Organization of Iran. (2009). Instruction for Seismic Rehabilitation of Existing Buildings (Code No.360).

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