Designing a prefabricated sandwich composite roofing system Made up of resisting facings and light-weight concrete core with truss-shaped connectors

Subject Areas : Structural Engineering

Arash  Totonchi ¹ (Assistant Professor, Department of Civil Engineering, Islamic Azad University, Marvdasht branch, Iran)
Allah dad  Ahmadi ² (Ph.D. candidate, Department of Civil Engineering, Structural trends, Islamic Azad University, Marvdasht branch, Iran)

Received: 2017-08-10 Accepted : 2017-12-22 Published : 2018-03-01

Keywords: Composite, Precast Sandwich Panels, light concrete Core, Resisting facings, Shear connectors,

Abstract :

In this paper, a new roofing system is introduced, which is constructued using the precast composite sandwich panels. This roofing sandwich panels system consists of three kinds of precast concrete sandwich panels including capital panels, beam or between columns panels, and slab or middle panels. The panels are composed of three layers; A high strength reinforced concrete top layer. A thick layer of light-weight concrete as the intermediate layer or core. And a tensile resistant reinforced concrete bottom layer. The panels are connected together by special connectors at the edges.In this research, the influence of shear connector stiffness is studied which is measured according to their diameter on ultimate resistant and combined performance of the panels. The results of finite element analysis by ABAQUS software show a logical behavior of load-deflectioncurves in shear connectors. Based on the economic and weight comparisons the dead and live loads,the proposed sandwich panel roofing is approximately 44 percent lighter than the conventional steel joist and concrete blocks. This comparison shows the superiority of this roofing system to joists and concrete blocks system and seems to be a good alternative for it. Due to the possibility of prefabrication and industrial production of the panels under factory conditions, and various other technical, economic, and constructional advantages of this roofing system, it is concluded that it can be viable substitute for current roofing systems in low to high-rise buildings and can save a considerable amount of material, labor, time, and cost in building construction.

References:

[1]     Ahmadi, A, Optimum design of an innovative one and two-way light-weight prefabricated, sandwich-type flooring panels Civil engineering, M.Scthesis,Razani,R,advisor.Science and Research center of fars province, Islamic Azad University, Shiraz, Iran, 2014.

[2]     Fadayi, J., Shayeste, A, The role of shear connectors on bending behavior of prefabricated sandwich panels (PCSP), Civilica Website, Danesh source, the fourth Civil engineering national congress, Iran, 2009.

[3]     Ahmadi, A., Razani, R. Designing and comparison of some samples of prefabricated concrete sandwiched ceiling slabs with Lightweight concrete core. Journal of Research and Development (Vol. 2, No.2, 2014-Page 9-20), 2014.

[4]     Benayoune,A.,Abang Ali, A.,Abdul samad,A.,And trikha, D,. (2007a). Flexural analysis of compositeone-and two-way sandwich slabs with truss-shaped connectors. Journal-The Institution of Engineers,Malaysia (vol. 68,No. 1,March, 2007.

[5]     Benayoune,A.، samad,A. A. A.,Abang Ali,A. A.,and  trikha,D. N,. (2007b). Response of pre-castreinforced composite sandwich panels to axial loading.Construction and building materials 21 (2007)677-685.

[6]     ABAQUS,Finite Element Program Theory Manual(version 6. 12. 1). Hibbit,Karlssson & Sorenson Inc.,USA,1993.

[7]     Kent, D.C,.park, R,.(1971). Flexural  Members with Confined  Concrete , Journal of Structural Division, Proceedings of the Amercican Society of Civil Engineers,Vol.97,No.ST7,1969-1990.

[8]     PCI committee on pre-cast concrete sandwich wall panels, State of the Art of Precast/Prestresses Sandwich Wall Panels, PCI J 1997;42(2): 92–133.

[9]     Einea A, Salmon D,C, Fogarasi G,J, Culp T, Tadros MK,. State - of- the-art of precast sandwich panel system. PCI J 1991; 36(6): 90 –101, 1991.

[10] Benayoune, A, Precast concrete sandwich panel as a building system, Ph.D. Thesis, Department of Civil Engineering, University of Putra, Malaysia, 2003.

[11] Einea, A, Structural and thermal efficiency of precast concrete sandwich panel system, Ph.D. thesis, Department of Civil Engineering University of Nebraska-Linkoln, Omaha, NE., 1992.

[12] Bush, T. D,. Stine, G. L, Flexural Behaviour ofcomposite Precast Concrete Sandwich Panels withContinuous Truss Connectors, PCI JOURNAL,Vol.39, No. 2, pp. 112-121. 1994.

[13] Benayoune,A,.Abdulsamad,A.A,Trikha,D.N,.Abang Ali, A.A ,. Ellinna, s.H.M Flexuralbehaviorof precast concrete sandwich composite panel-Exprimental and theoretical investigations . science direct. Construction and Building Materials 22 580-592, 2008.

[14] Schaumann, E ,. Vallee,T., and Keller,T, a. Direct load transmission  in san dwich slabs with lightweight concrete ore.TailorMadeConcrete Structures-Walraven& Stoelhorst(eds)2008.Taylor & Francis Group, London,lSBN 978-0-415-47535-8.

[15] Schaumann,E., vallee,T, and Keller,T, (2008b). Direct load transfer of hybrid FRP-concrete sandwich structure for bridge decks. Fourth International Composites in Civil Engineering (CICE2008)  2-24 July,zurich,Switzerland.

[16] Schaumann,E,. (2008c). Hybrid FRP-lightweight concrete sandwich system for Engineering structures. Thesis,Dipl.-Lag.,Vniversitat Karlsruhe Allemagne et De Nationalite Allemande .

[17] Ahmad,I,.Mohamad,N, Sructural Behaviour of precast lightweight concrete sandwich panel under Eccentric Load[18]:An over view. University Tun Hussein Onn Malaysia, 2011.

[18] Einea,A., Salmon, D .,Tadros, M ,.  Culp,T,. A new structurally and   thermally efficient  precast  sandwich  panel  system. PCI, Journal,July-August1994,90-101, 1994.

[19] Park, R.and paulay, T,. Rienforced Concrete Structures, Johen Wiley and Sons , 1975.

[20] Mohammed Hussin, A. D., Structural Behavior of Composite Sandwich Slab Panels. Journal of Engineering and Development, Vol. 17, No.4,October 2013,ISSN 1833-7822, 2013.

[21] Noridah Mohammad. A. I. Khalil, A.A,.Abdul Samad, W.I.Goh,. Structural Behavior of Precast Light-Weight Foam Concrete Sandwich Panel With Double Shear Truss Connectors Flexural Load. Hindawi Publishing corporation ISRN Civil Engineering Volume 2014, Article ID 317941,7, 2014.

[22] Mugahed Amran, Y.H.,Raizal , S,. M,. Rashid, Farzad Hejazi, Nor Azizi Safiee, A. A. Abang Ali Response of precast foamed concrete sandwich panelsto flexural loading. Journal ofBuildingEngineering7(2016)143–158,2016.