حل سیستم تک درجه آزادی دال بتن مسلح دوطرفه تحت بارگذاری انفجاری

نوع مقاله : مقاله پژوهشی

نویسندگان

1 مهندسی عمران، دانشکده پدافندغیرعامل، دانشگاه صنعتی مالک اشتر، تهران، ایران

2 دانشگاه مالک اشتر

چکیده

دال‌های بتن مسلح از پرکاربردترین اعضای سازه‌ای مقاوم در برابر انفجار هستند. رفتار دال بتن مسلح در بارگذاری انفجاری پیچیده و غیرخطی است. برحسب مقدار ماده منفجره، وضعیت تکیه‌گاه‌ها، نسبت تسلیح و غیره، آسیب و خیز حداکثر در دال متفاوت خواهد بود. در این پژوهش روش تحلیلی بر مبنای حل سیستم تک درجه آزادی برای محاسبه خیز حداکثر دال بتن مسلح دوطرفه تحت بار انفجار پیشنهاد شد. با حل معادلات سیستم تک‌درجه آزادی دال، محاسبه پاسخ‌های حداکثر و مقایسه آن با نتایج تحلیل‌های غیرخطی با نرم‌افزار LS-Dyna و پاسخ‌های دستورالعمل 02- 340- 3 UFC مشخص شد که در اکثر شرایط بارگذاری و هندسه دال، نتایج تحلیل تک‌درجه آزادی ارائه ‌شده، اقتصادی‌تر از پاسخ‌های دستورالعمل UFC می‌باشد. همچنین نمودارهای پاسخ دستورالعمل 02- 340- 3 UFC و رابطه ایمپالس در بازه‌های زمانی محدودی قادر به محاسبه پاسخ اعضای خمشی است اما روش تحلیلی مورد بررسی، برای تمام شرایط بارگذاری و هندسی دال پاسخگو می­باشد.

کلیدواژه‌ها

عنوان مقاله [English]

SDOF System Solution of the Two-Way RC Slab Subjected to Blast Loading

نویسنده [English]

  • sajjad peymani forushani 1
1 Passive defense faculty, Malek Ashtar University, Tehran, Iran
2
چکیده [English]

Reinforced concrete slabs are one of the most frequently used blast-resistant structural elements. The RC slab behavior under blast loading is nonlinear and complicated. The maximum slab displacement differs by the amount of explosive, support conditions, steel ratio, etc. In the present paper, the maximum deflection of two-way RC slabs subjected to blast loading is studied. To this purpose, the RC slabs are replaced by SDOF equivalent systems with bilinear stiffnesses through determining the equivalent mass and stiffness. The results of comparing the analytical proposed method with the nonlinear analysis by the LS-Dyna software and the method specified by UFC 3-340-02 guideline show that in most loading conditions and slab geometries, the output of proposed method is more economical than the UFC guideline. In addition, whilst the UFC method is not applicable for all time ranges, the proposed method can determine the structural element response at any time range.

کلیدواژه‌ها [English]

  • RC Slab
  • Blast
  • System with a Single degree of Freedom
  • Non-Linear Analysis
  • UFC 3-340-02 Guideline

مراجع

  1. Du, H.; Li, Z. “Numerical Analysis of Dynamic Behavior of RC Slabs Under Blast Loading”; Trans. Tianjin Univ. 2009, 15, 61-64.##
  2. Chang, K.Y.; Hwang, S.J. “Practical Estimation of Two-way Slab Deflections”; J. Struct. Eng. 1996, 122, 150-159.##
  3. Rong, H.C.; Li, B. “Deformation-controlled Design of Reinforced Concrete Flexural Members Subjected to Blast Loadings”; J. Struct. Eng. 2008, 134, 1598-1610.##
  4. El-Dakhakhni, W. W.; Changiz Rezaei, S. H.; Mekky, W. F.; Razaqpur, A. G. “Response Sensitivity of Blast-Loaded Reinforced Concrete Structures to the Number of Degrees of Freedom”; Can. J. Civ. Eng. 2009 , 36, 1305-1320.##
  5. El-Dakhakhni, W. W.; Mekky, W. F.; Rezaei, S. C. “Validity of SDOF Models for Analyzing Two-way Reinforced Concrete Panels Under Blast Loading”; J. Perform Constr. Fac. 2010, 24, 311-325.##
  6. Muhamad, R.; Ali, M. M.; Oehlers, D.; Sheikh, A. H. “Load-slip Relationship of Tension Reinforcement in Reinforced Concrete Members”; Eng. Struct. 2011, 33, 1098-1106.##
  7. Carta, G.; Stochino, F. “Theoretical Models to Predict the Flexural Failure of Reinforced Concrete Beams Under Blast Loads”; Eng. Struct. 2013, 49, 306-315.##
  8. Low, H. Y.; Hao, H. “Reliability Analysis of Reinforced Concrete Slabs Under Explosive Loading”; Struct. Saf. 2001, 23, 157-178.##
  9. Stochino, F. “RC Beams Under Blast Load: Reliability and Sensitivity Analysis”; Eng. Fail. Anal. 2016, 66, 544-565.##
  10. Stochino, F.; Carta, G. “SDOF Models for Reinforced Concrete Beams Under Impulsive Loads Accounting for Strain Rate Effects”; Nucl. Eng. Des. 2014, 276, 74-86.##
  11. Hao, H.; Hao, Y.; Li, J.; Chen, W. “Review of the Current Practices in Blast-Resistant Analysis and Design of Concrete Structures”; Adv. Struct. 2016, 19, 1193-1223.##
  12. Kristoffersen, M.; Pettersen, J. E.; Aune, V.; Børvik, T. “Experimental and Numerical Studies on the Structural Response of Normal Strength Concrete Slabs Subjected to Blast Loading”; Eng. Struct. 2018, 174, 242-255.##
  13. Ebrahimi, H.; Someh, L. K.; Norato, J.; Vaziri, A. “Blast-Resilience of Honeycomb Sandwich Panels”; Int. J. Mech. Sci. 2018, 144, 1-9.##
  14. Qi, C.; Remennikov, A.; Pei, L. Z.; Yang, S.; Yu, Z. H.; Ngo, T. D. “Impact and Close-In Blast Response of Auxetic Honeycomb-Cored Sandwich Panels: Experimental Tests and Numerical Simulations”; Compos. Struct. 2017, 180, 161-178.##
  15. Zhao, C.; Lu, X.; Wang, Q.; Gautam, A.; Wang, J.; Mo, Y. L. “Experimental and Numerical Investigation of Steel-Concrete (SC) Slabs Under Contact Blast Loading”; Eng. Struct. 2019, 196, 109337.##
  16. Ghalehnovi, M.; Yousefi, M.; Karimipour, A.; de Brito, J.; Norooziyan, M. “Investigation of the Behaviour of Steel-Concrete-Steel Sandwich Slabs with Bi-Directional Corrugated-Strip Connectors”; Appl. Sci. 2020, 10, 8647.##
  17. Golmohammadi, M.; Ghalehnovi, M.; Yousefi, M. “Experimental Investigation of Steel-Concrete-Steel Slabs with Stud Bolt Connectors Subjected to Punching Loading”; Amirkabir Journal of Civil Engineering. 2019, 3, 93-106.##
  18. Meng, L.; Wang, Y.; Zhai, X. “Modeling and Dynamic Response of Curved Steel–Concrete–Steel Sandwich Shells Under Blast Loading”; J. Steel Struct. 2020, 20, 1663-1681.##
  19. Wang, Y.; Zhai, X. “Development of Dimensionless PI Diagram for Curved SCS Sandwich Shell Subjected to Uniformly Distributed Blast Pressure”; Front. Struct. Civ. Eng. 2019, 13, 1432-1445.##
  20. “Structures to Resist the Effect of Accidental Explosions”; Unified Criteria UFC 3-340-02, Department of Defense, USA, 2014.##
  21. Hetherington, J.; Smith, P. “Blast and Ballistic Loading of Structures”; CRC Press, 2014.##
  22. Uddin, N. “Blast Protection of Civil Infrastructures and Vehicles Using Composites”; Woodhead Publishing, 2010.##
  23. Karlos, V.; Solomos, G.; Larcher, M. “Analysis of the Blast Wave Decay Coefficient Using the Kingery–Bulmash Data”; Int. J. Prot. Struct. 2016, 7, 409-429.##
  24. Hamzeh, M.; Khosravi, F.; Behbahani, H. P. “Investigation of Explosion Effects on the Border Concrete Tunnels”; Adv. Defence Sci. & Technol. 2017, 9, 349-358 (In Persian).##
  25. Seifollahi, H.; Morshed, R. “Behavior of Reinforced Concrete Slabs against the Blast Wave”; Amirkabir Journal of Civil Engineering. 2018, 687-696 (In Persian).##
  26. Hallquist, J. O. “LS-DYNA® Keyword User’s Manual Volume II Material Models”; Livermore, California, USA, 2013.##
  27. Manual, LS-DYNA Keyword User’S., and I. Volume. "Livermore Software Technology Corporation (LSTC)." Volume II: material models. Version 971, 2012.##
  28. Jia, H.; Yu, L.; Wu, G. “Damage Assessment of Two-Way Bending RC Slabs Subjected to Blast Loadings”; Sci. World J. Article ID 718702, 2014, 2014, 4-8.##

فایل ها

سابقه مقاله

  • تاریخ دریافت: 13 تیر 1399
  • تاریخ بازنگری: 29 فروردین 1400
  • تاریخ پذیرش: 29 فروردین 1400
  • تاریخ انتشار: 01 مرداد 1400

هم رسانی

ارجاع به این مقاله

آمار