رفتار بعد از ترک دال مجوف بتن مسلح در خمش

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا عمران- سازه، دانشکده فنی، دانشگاه گیلان

2 استادیار گروه مهندسی عمران، دانشکده فنی، دانشگاه گیلان

10.22124/jcr.2022.21007.1532

چکیده

دالهای مجوف بتنی به علت مزایای زیادی که از لحاظ عملکردی و اقتصادی دارند، امروزه به یکی از سیستم های پرکاربرد در سقف ساختمانها و عرشه پلها تبدیل شده اند. با وجود تحقیقات و مطالعات عددی و آزمایشگاهی جامعی که بر روی دالهای مجوف و عملکرد آنها صورت گرفته است، اطلاعات اندکی درباره رفتار بعد از ترک این نوع دالها وخصوصا ویژگی سخت شدگی کششی در آنها وجود دارد. رفتار بعد از ترک عمدتا در دالها و تیرهای توپر مورد مطالعه قرار گرفته است و در این میان دالهای مجوف کمتر مورد توجه قرار گرفته اند. در این تحقیق 9 رابطه معروف تنش-کرنش کششی بتن که اثر سخت شدگی کششی نیز در آنها لحاظ شده، مورد مطالعه قرار گرفته و کارایی آنها در پیش بینی رفتار دالهای مجوف بتنی مورد بررسی قرار گرفته است. بدین منظور یک برنامه کامپیوتری بر مبنای مدل لایه ای برای تحلیل دالها و تیرهای سوراخدار ارائه شده است. در نهایت با به کارگیری روابط تنش-کرنش کششی مذکور برای بتن در برنامه کامپیوتری و مقایسه نتایج عددی با نتایج آزمایشگاهی بهترین رابطه کششی بتن برای پیش بینی رفتار دالهای مجوف بتن مسلح بعد از ترک معرفی و پیشنهاد میگردد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Post Cracking Behavior of Hollow Core Slabs in Flexure

نویسندگان [English]

  • Maedeh Moeeni 1
  • Javad Razzaghi Langroudi 2
1 PhD candidate, Department of civil engineering, University of Guilan, Rasht, Iran
2 Assistant professor, Department of civil engineering, University of Guilan, Rasht, Iran
چکیده [English]

This study aims to investigate several well-known stress-strain relationships for tensile concrete in literature and introduces the most appropriate one for predicting flexural behaviour of reinforced concrete hollow core slabs in post cracking phase. Despite comprehensive experimental and numerical researches that are conducted to understand the performance of hollow core slabs, limited information exists about post cracking behavior and specifically the tension stiffening characteristic of this system. In the current study some relationships that were proposed by other researchers for reinforced concrete in tension and flexure are concerned. Numerical analyses were performed by a program based on a layered approach which was specifically developed for analysis of voided slabs. Different tension relationships for concrete from previous literature were implemented in the code and the numerical results were compared with experimental results. Eventually, the most appropriate tension relationship of concrete for predicting post cracking flexural behavior of hollow core slabs will be proposed.

کلیدواژه‌ها [English]

  • Hollow core slab
  • post cracking behavior
  • flexure
  • tension stiffening
  • numerical study
[1] Al-Shaarbaf I A, Al-Azzawi A A and Abdulsattar R A, “State of The Art Review on Hollow Core Slabs”, ARPN Journal of Engineering and Applied Sciences 13(9):3240-3245, (2018).
[2] ASSP (Association of Manufacturers of Prestressed Hollow Core FLoors), “The Hollow Core Floor Design and Applications, Manual of ASSP”, Published by Offset Print Veneta, Verona , Italy, 1th edition.
[3]Crisfield M A and Twemlow R P, “The Equivalent Plate Approach for The Analysis of Cellular Structures”, Civil Engineering and Public Works Review 259-263, (1971).
[4] Cusens A R and Pama R P, “Distribution of Concentrated Loads on Orthotropic Decks”, The Structural Engineer 99(9): 377-385, (1969).
[5] Arendts J G and Sanders W W, “Concrete Box Girder Bridges as Sandwich Plates”, ASCE Journal of the Structural Division 96(1): 2353 -2371, (1970).
[6] Basu A K and Dawson J M, “Orthotropic Sandwich Plates, Supplement to Proceedings”, Institution of Civil Engineers 87- 115, (1970).
[7] Hook I M A and Richmond B, “Western Avenue Extension -Precast Concrete Box Beams in Cellular Bridge Decks”, The Structural Engineer 48(3), (1970).
[8] Sawko F and Willcock B K, “Computer Analysis of Bridges Having Varying Section Properties”, The Structural Engineer 45(11): 395-399, (1967).
[9] Smyth W J R and Srinavasan S, “The Analysis of Gateshead Viaduct”, The Structural Engineer 5(2): 51-59, (1973).
[10] Mason B, Cheung S K and Cheung M S, “Analysis of Cellular Structures by Finite Strip Method” In 5th Symposium on Engineering Applications of Mechanics, Ottawa, (1980).
[11] Adawi A, Youssef M A and Meshaly M, “Finite Element Modelling of The Composite Action between Hollow Core Slabs and The Topping Concrete”, Engineering structures 124(1): 302-315, (2016).
[12] Al-Azzawi A A and Abed S A, “Numerical Analysis of Reinforced Concrete Hollow-Core Slabs”, ARPN Journal of Engineering and Applied Sciences 11(15):9284-9296, (2016).
[13] Bakht B, Jaeger L G, Cheung M S and Mufit A A, “The State of The Art in Analysis of Cellular and Voided Slab Bridges”, Canadian Journal of Civil Engineering 8(3): 376-391, (1981).
[14] Cuenca E and Serna P, “Failure Modes and Shear Design of Prestressed Hollow Core Slabs Made of Fiber-Reinforced Concrete”, Composites: Part B 45(1): 952-964, (2013).
[15] Ibrahim I S, Elliott K S and Copeland S, “Bending Capacity of Precast Prestressed Hollow Core Slabs with Concrete Toppings”, Malaysian Journal of Civil Engineering 20(2): 260-283, (2008).
[16] Michelini E, Bernardi P and Belletti B, “Experimental And Numerical Assessment of Flexural and Shear Behavior of Precast Prestressed Deep Hollow‑Core Slabs”, International Journal of Concrete Structures and Materials 14(31), (2020).
[17] Oduyemi T 0 S and Clark L A, “Tension Stiffening in Longitudinal Sections of Circular Voided Concrete Slabs”, Proceedings of the Institution of Civil Engineers 83(4): 861-874, (1987).
[18] Pajari M, (2010) “Prestressed Hollow Core Slabs Supported on Beams”, finnish shear tests on floors in 1990–2006. VTT Technical Research Centre of Finland.
[19] Sabr Y N, Jarallah H KH and Abdulkareem H I, “Assessment The Shear Behavior of Sustainable Thick Hollow Core Slab Using Experimental and Nonlinear Finite Element Modelling”, Anbar Journal of Engineering Science 8(1): 35-43, (2014).
[20] Sgambi L, Gkoumas K and Bontempi F, “Genetic Algorithm Optimization of Precast Hollow Core Slabs”, Techno Press Journal 13(3): 389-409, (2014).
[21] Stanton J F, “Response of Hollow-Core Slab Floors to Concentrated Load”, PCI Journal, 37(4): 98-113, (1992).
[22] Wariyatno N G, Haryanto Y and Sudibyo G H, “Flexural Behavior of Precast Hollow Core Slab Using PVC Pipe and Styrofoam with Different Reinforcement”, Procardia Engineering 171: 909-916, (2017).
[23] Xie J Zh, “Macroscopic Elastic Constitutive Relationship of Cast-In-Place Hollow-Core Slabs”, Journal of Structural Engineering 135(9): 1040-1047, (2009).
[24] Barros M, Martins R A F and Ferreira C C, “Tension Stiffening Model with Increasing Damage for Reinforced Concrete”, Engineering Computations 18(5-6):759–785, (2001).
[25] Beeby A W, Scott R H and Jones A E K, “Revised Code Provisions for Long-Term Deflection Calculations”, Structures and Buildings 158(1):71-75, (2005).
[26] Carreira D J and Chu K, “Stress- Strain Relationship for Reinforced Concrete in Tension”, ACI Journal 21-28, (1986).
[27] Clark L A and Cranston W B, “The Influence of Bar Spacing on Tension Stiffening in Reinforced Concrete Slabs”, In Advance Concrete Slab Technology, 118-128, (1979).
[28] Kaklauskas G, “Flexural Layered Deformational Model of Reinforced Concrete Members”, Magazine of Concrete Research 56(10): 575–584, (2004).
[29] Kaklauskas G, Gribniak V and Bacinskas D, “Tension Stiffening Relationships Based on Design Code Provisions”, in 3rd fib International Congress, Washington, D.C., USA, (2010).
[30] Okamura H, Maekawa K, “Verification of Modelling for Reinforced Concrete Finite Element”, In Finite Element Analysis of Reinforced Concrete Structures Conference, Tokyo, Japan, (1985).
[31] Petersson P, “Crack Growth and Development of Fracture Zones in Plain Concrete and Similar Materials”, Division of Building Materials, Report TVBM 1006, (1981).
[32] Prakhya G K V and Morley C T, “Tension-Stiffening and Moment-Curvature Relations of Reinforced Concrete Elements” ACI Structural Journal 87(5): 597–605, (1990).
[33] Stramandinoli R S B and Rovere H L L, “an Efficient Tension-Stiffening Model for Nonlinear Analysis of Reinforced Concrete Members”, Engineering Structures 30(7): 2069-2080, (2008).
[34] Torres L, Lo´pez-Almansa f and Bozzo L M, “Tension Stiffening Model for Cracked Concrete Flexural Members”, Journal of Structural Engineering 130(8): 1242-1251, (2004).
[35] Vecchio F J and Collins P, “The Modified Compression Field Theory for Reinforced Concrete Elements Subjected to Shear”, ACI Journal 83(6): 925-933, (1986).
[36] Clark L A and Cranston W B, “The Influence of Bar Spacing on Tension Stiffening in Reinforced Concrete Slabs”, In Advance Concrete Slab Technology 118-128, (1979).
[37] Clark L A and Speirs D M, “Tension Stiffening in Reinforced Concrete Beams and Slabs Under Short Term Load”, London Cement and Concrete Association, Technical Report 42.521. 19 pp, (1978).
[38] Damjanic F and Owen D R, “Practical Consideration for Modeling Of Postcarcking Concrete Behavior For Finite Element Analysis of Reinforced Concrete Structures” Proc., Int. Conf. on Computer Aided Analysis of the Design of Concrete Structures, Pineridge, Swansea, UK, (1984).
[39] Scott R H, “The Short-Term Moment–Curvature Relationship for Reinforced Concrete Beams”, Proceedings of the Institution of Civil Engineers, 75(2):725–734, (1983).
[40] Kaklauskas G and Ghaboussi J, “Stress- Strain Relations for Cracked Tensile Concrete from RC Beam Tests”, Journal of Structural Engineering 127(1): 64-73, (2001).
[41] Hognestad E, “Study On Combined Bending and Axial Load in Reinforced Concrete Members”, University of Illinois, Report: University of Illinois Engineering Experiment Station, No.399, (1951).
[42] Gizejowski  M A, Barcewicz W and Salah W, “Finite Element Modelling of The Behaviour of A Certain Class of Composite Steel-Concrete Beam-to-Column Joints”, Archives of civil Engineering, 1:19-56, (2010)
[43] Liew A and Gardner L, Ultimate Capacity of Structural Steel Cross-Sections Under Compression, Bending And Combined Loading, Structures,1:2-11, (2014)
[44] Hagsten L G, Rasmussena A B, and Fiskera J, Strain Capacity of Reinforced Concrete Members Subjected to Uniaxial Tension, Procedia Engineering, 172:339-349, (2017).
[45] Gilbert R L, “Tension Stiffening in Lightly Reinforced Concrete Slabs”, Journal of Structural Engineering, 133(6):899-903, (2007).
[46] AASHTO (American Association of State Highway and Transportation Officials), LRFD Bridge Design Specification, AASHTO, Washington, DC, (2012).
[47] ACI (American Concrete Institute) Building Code Requirements for Structural Concrete ACI 318M-14, ACI, Farmington Hills, NJ, USA, (2014).
[48] Polak M A, “Nonlinear Analysis if Reinforced Concrete Shells”, PhD Thesis. University of Toronto, (1992).