اثر نیروی غشایی فشاری و دال‌های اطراف بر رفتار سازه دال تخت در خرابی پیش رونده

قیاسی, واحد; موسی پور, اسماعیل; مدندوست, رحمت

doi:10.22065/jsce.2020.240430.2197

اثر نیروی غشایی فشاری و دال‌های اطراف بر رفتار سازه دال تخت در خرابی پیش رونده

نوع مقاله : علمی - پژوهشی

نویسندگان

¹ استادیارگروه مهندسی عمران، دانشکده عمران و معماری ، دانشگاه ملایر، ملایر ؛ ایران

² دانشجوی دکتری سازه، دانشکده عمران و معماری، دانشگاه ملایر، ملایر، ایران

³ دانشیارگروه مهندسی عمران، دانشکده فنی ، دانشگاه گیلان، رشت ایران

10.22065/jsce.2020.240430.2197

چکیده

در این مقاله با استفاده از روش مدلسازی ماکرو، آنالیز دینامیکی ساختمان‌های دال تخت به منظور ارزیابی مقاومت خرابی پیش رونده آن‌ها ارائه شده است. در این آنالیزها رفتار پس پانچ اتصالات دال-ستون مدنظر قرار گرفته است. وجود قید جانبی، به دلیل ایجاد نیروی غشایی فشاری در دال، باعث افزایش سختی و مقاومت خمشی دال و درنهایت افزایش مقاومت برش پانچ می‌شود. در دال‌های پیوسته، قید جانبی توسط خود دال تأمین می‌شود. همچنین در تحقیقات آزمایشگاهی به دلایل کاهش هزینه و محدودیت فضای آزمایش، معمولاً بخشی از سازه دال تخت، جداشده و برای شبیه سازی اثر دال‌های اطراف در لبه‌های پیش آمدگی‌ها یک بار افزایش یافته اعمال می‌شود. با استفاده از مدل ماکروی اعتبارسنجی شده، اثر عمل غشایی فشاری و دال‌های اطراف بر پاسخ سازه دال تخت بررسی شده است. نتایج تحلیل‌ها نشان داد که نیروی غشایی فشاری دال ظرفیت باربری نهایی سازه را در سناریوی حذف ناگهانی ستون افزایش می‌دهد. البته این افزایش ظرفیت باربری سازه متناسب با افزایش مقاومت پانچ در اتصالات دال- ستون نیست. همچنین نتایج نشان داد که نادیده گرفتن اثر قید جانبی ناشی از دال‌های اطراف، ظرفیت بازتوزیع بار سازه دال تخت جداشده را کمتر از واقیت تخمین می‌زند. پیشنهاد می‌‌شود به منظور شبیه سازی اثر دال‌های اطراف بر رفتار سازه دال تخت جداشده، قیدهای دورانی در لبه‌های پیش آمدگی‌های دال قرارگیرد.

کلیدواژه‌ها

موضوعات

خرابی پیشرونده

عنوان مقاله [English]

The effect of compressive membrane force and surrounding slabs on the behavior of flat slab structures in progressive collapse

نویسندگان [English]

Vahed Ghiasi ¹
Esmaeil Mousapoor ²
rahmat madandoust ³

¹ Assistant Professor of Geotechnical Engineering Department of Civil Engineering Faculty of Civil and Architecture Engineering University of Malayer - Iran,

² Ph.D Student of Structural Engineering, Department of Civil and Architectural Engineering, Malayer University, Malayer, Iran.

³ Associate Professor, Department of Civil Engineering, University of Guilan, Rasht, Iran.

چکیده [English]

This paper presents the dynamic analysis of flat slab buildings using macro modeling method to evaluate their progressive collapse resistance. In these analyzes, the post-punching behavior of slab-column connections is considered. The presence of lateral restraints, by development compressive membrane force in the slab, increases the stiffness and flexural strength of the slab and ultimately increases the punching shear strength. In continuous slabs, the lateral restraint is provided by the slab itself. In experimental testing, part of the flat slab structure is typically extracted in the tests due to cost reduction and limited test space, and an additional load is applied to the slab edges to simulate the influence of the surrounding slabs. The effect of compressive membrane action and surrounding slabs on the response of flat slab structures was investigated using a validated macro-model. The findings of the study indicate that the slab 's compressive membrane force enhances the ultimate load bearing capacity in the column removal scenario. This increase in bearing capacity of the structure is, of course, not proportional to the increase in punching resistance in slab-column connections. The results also indicate that ignoring the lateral restraint effect of the surrounding slabs underestimates the capacity of the substructure for load redistribution. It is suggested that rotational restraints be placed on the slab edges in order to simulate the effect of surrounding slabs on the behavior of the substructure.

کلیدواژه‌ها [English]

Compressive membrane action
Post-punching resistance
Flat slab
Punching shear
Progressive collapse

مراجع

[1] ASCE-7.(2010). Minimum design loads for buildings and other structures. American Society of Civil Engineers, SEI/ASCE-7.

[2] DOD.(2009). Design of buildings to resist progressive collapse UFC-4-023-03. Washington, DC: Department of Defense.

[3] GSA.(2013). Progressive collapse analysis and design guidelines for new federal ofce buildings and major modernization projects. Washington,DC: General Services Administration.

[4] Y. Mirzaei.(2010).Post-punching behavior of reinforced concrete slabs, PhD thesis 4613, École Polytechnique Fédérale de Lausanne(EPFL), Lausanne, Switzerland.

[5] M. F. Ruiz, Y. Mirzaei, and A. Muttoni. (2013).Post-punching behavior of flat slabs, ACI Structural Journal, vol. 110, no. ARTICLE, pp. 801-812.

[6] F. Habibi, E. Redl, M. Egberts, W. D. Cook, and D. Mitchell. (2012).Assessment of CSA A23. 3 structural integrity requirements for two-way slabs, Canadian Journal of Civil Engineering, vol. 39, no. 4, pp. 351-361.

[7] J. Russell, J. Owen, and I. Hajirasouliha. (2015).Experimental investigation on the dynamic response of RC flat slabs after a sudden column loss, Engineering Structures, vol. 99, pp. 28-41.

[8] L. Keyvani, M. Sasani, and Y. Mirzaei. (2014).Compressive membrane action in progressive collapse resistance of RC flat plates, Engineering structures, vol. 59, pp. 554-564.

[9] Z. Peng, S. L. Orton, J. Liu, and Y. Tian. (2018).Experimental study of dynamic progressive collapse in flat-plate buildings subjected to an interior column removal, Journal of Structural Engineering, vol. 144, no. 8, p. 04018094.

[10] K. Qian and B. Li. (2015).Dynamic disproportionate collapse in flat-slab structures, Journal of Performance of Constructed Facilities, vol. 29, no. 5, p. B4014005.

[11] F. Ma, B. P. Gilbert, H. Guan, H. Xue, X. Lu, and Y. Li. (2019).Experimental study on the progressive collapse behaviour of RC flat plate substructures subjected to corner column removal scenarios, Engineering Structures, vol. 180, pp. 728-741.

[12] J. Liu, Y. Tian, S. L. Orton, and A. M. Said. (2015).Resistance of flat-plate buildings against progressive collapse. I: Modeling of slab-column connections, Journal of Structural Engineering, vol. 141, no. 12, p. 04015053.

[13] V. Ghiasi, E. Mousapoor, and R. Madandoust. (2020).Macro modeling of post-punching behavior of flat slabs in progressive collapse, (in eng), Modares Civil Engineering journal, Original Research vol. 19, no. 6, pp. 0-0. [Online]. Available: http://journals.modares.ac.ir/article-16-35667-fa.html

[14] E. Mousapoor, V. Ghiasi, and R. Madandoust.(2020) "Macro modeling of slab-column connections in progressive collapse with post-punching effect," in Structures, 2020, vol. 27: Elsevier,Published, pp. 837-852.

[15] Z. Peng, S. L. Orton, J. Liu, and Y. Tian. (2017).Effects of in-plane restraint on progression of collapse in flat-plate structures, Journal of Performance of Constructed Facilities, vol. 31, no. 3, p. 04016112.

[16] Y.-H. Weng, K. Qian, F. Fu, and Q. Fang. (2020).Numerical investigation on load redistribution capacity of flat slab substructures to resist progressive collapse, Journal of Building Engineering, vol. 29, p. 101109.

[17] J. Einpaul, M. F. Ruiz, and A. Muttoni. (2015).Influence of moment redistribution and compressive membrane action on punching strength of flat slabs, Engineering Structures, vol. 86, pp. 43-57.

[18] J. Einpaul, C. E. Ospina, M. Fernández Ruiz, and A. Muttoni.(2016).Punching shear capacity of continuous slabs.in "ACI Structural Journal.

[19] A. Muttoni. (2008).Punching shear strength of reinforced concrete slabs without transverse reinforcement, ACI structural Journal, vol. 4, no. ARTICLE, pp. 440-450.

[20] A. Soleymani and m. R. Esfahani. (2019).Effect of concrete strength and thickness of flat slab on preventing of progressive collapse caused by elimination of an internal column, Journal of Structural and Construction Engineering (JSCE), vol. 6, no. 1, pp. 24-40, doi: 10.22065/jsce.2017.98444.1335.

[21] M. S. Sheu and N. M. Hawkins. (1980).Grid model for predicting the monotonic and hysteretic behavior of slab-column connections transferring moments, Special Publication, vol. 63, pp. 79-112.

[22] D. Coronelli. (2010).Grid Model for Flat-Slab Structures, ACI Structural journal, vol. 107, no. 6.

[23] Y. Tian, J. Chen, A. Said, and J. Zhao. (2012).Nonlinear modeling of flat-plate structures using grid beam elements, Computers & Concrete, vol. 10, no. 5, pp. 489-505.

[24] Y. Mirzaeia and M. Sasani. (2013).Progressive collapse resistance of flat slabs: modeling post-punching behavior, Computers and Concrete, vol. 12, no. 3, pp. 351-375.

[25] N. W. Ulaeto.(2018).Progressive collapse analysis of reinforced concrete flat slab structures considering post-punching and dynamic response, University of Surrey (United Kingdom).

[26] A. Setiawan, R. L. Vollum, L. Macorini, and B. Izzuddin. (2019).Efficient 3-D modelling of punching shear failure at slab-column connections by means of nonlinear joint elements, Engineering Structures, vol. 197, p. 109372.

[27] A. C. Institute.(2014). ACI 318-14 Building Code Requirements for Structural Concrete and Commentary (Metric). American Concrete Institute.

[28] EC2.(2004). Eurocode 2: Design of concrete structures: Part 1-1: General rules and rules for buildings. British Standards Institution.

[29] S. Mazzoni, F. McKenna, M. H. Scott, and G. L. Fenves. (2006).OpenSees command language manual, Pacific Earthquake Engineering Research (PEER) Center, vol. 264.

[30] K. Qian and B. Li. (2016).Resilience of flat slab structures in different phases of progressive collapse, ACI Structural Journal, vol. 113(3), pp. 537-548.

[31] B. Izzuddin, A. Vlassis, A. Elghazouli, and D. Nethercot. (2008).Progressive collapse of multi-storey buildings due to sudden column loss—Part I: Simplified assessment framework, Engineering structures, vol. 30, no. 5, pp. 1308-1318.

[32] BHRC.(2014). Iranian code of practice for seismic resistant design of buildings,standard no. 2800-14. Tehran: Building and Housing Research Center.

[33] Z. Peng, S. L. Orton, J. Liu, and Y. Tian. (2017).Experimental study of dynamic progressive collapse in flat-plate buildings subjected to exterior column removal, Journal of Structural Engineering, vol. 143, no. 9, p. 04017125.