عنوان مقاله [English]
In this study، a new roofing system made of precast composite sandwich panels is introduced. This sandwich panels floor system consists of three kinds of precast concrete sandwich panels including capital panels، beam or between columns panels، and slab or middle panels. This panels are built of three layers; A high strength reinforced concrete as top layer، a thick layer of light-weight concrete as a middle layer or core and the third layer or lowest layer is an ordinary reinforced concrete. These panels are connected together with special connectors at their edges. In this study، ABAQUS software has been used for modeling and analyzing the sandwich panels floor system. Moreover، to optimize the design of the sandwich floor panels with different spans، a MATLAB code has been was developed; By entering the properties of steel sections and mechanical properties of concrete used in construction of the sandwich panel in this program the optimum design variables for panels of different، spans، loading and boundary conditions and design constraints was determined which are shown by means of curves and tables; The objective of this optimization was to obtain the lightest and most economical options. Due to possibility of industrial production of precast panels under standard conditions and simplicity of construction, the introduced novel floor system can be a viable alternative for common floor systems. Besides ،the novel system can save amount of material، labor، time، and cost in building construction.
 Ahmadi, Allahdad. and Razani, Razani. (2014.( 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.
 Ghasemi, M. and Ataryany, M. (2008.( Optimization flooring composite include Concrete pan on steel beams with ant colony algorithm. Civilica: Reference knowledge.
 ABAQUS, Finite Element Program Theory Manual (version 6. 12. 1). Hibbit, Karlssson & Sorenson Inc. USA,1993.
 Benayoune, A. Abang Ali, A. Abdul samad, A. And trikha, D. (2007). Flexural analysis of composite one-and two-way sandwich slabs with truss-shaped connectors. Journal, The Institution of Engineers, Malaysia vol. 68, No. 1March 2007.
 Benayoune, A. samad, A. A. A. Abang Ali, A. A. and trikha, D. N. (2007). Response of pre-cast reinforced composite sandwich panels to axial loading. Journal of Construction and building materials, page677-685.
 Benayoune, A. Abdul samad, A. A. Trikha, D. N. Abang Ali, A.A., and Elianna, s. H. M. (2008). Flexural behavior of pre- cast concrete sandwich composite Panel-Experimental and theoretical investigations. science direct. Journal of Construction and Building Materials, page 580-592
 Schaumann, E. Vallee, T. and Keller, T. (2008). Direct load transmission in sandwich slabs with lightweight concrete core. Tailor Made Concrete Structures-Walraven& Stoelhorst (eds) 2008 Taylor & Francis Group, London, lSBN 978-0-415-47535-8.
 Schaumann, E. vallee, T. and Keller, T. (2008). Direct load transfer of hybrid FRP-concrete sandwich structure for bridge decks. Fourth International Composites in Civil Engineering. CICE2008. 22-24 July, Zurich, Switzerland.
 Schaumann, E. (2008). Hybrid FRP-lightweight concrete sandwich system for Engineering structures. Thesis, Dipl. Lag. Vniversitat Karlsruhe Allemagne et De Nationalite Allemande.
 Ahmad, I. and Mohamad, N. (2011). Sructural behaviour of precast lightweight concrete sandwich panel under Eccentric Load: An over view. University Tun Hussein Onn Malaysia.
 Einea, A. Salmon, D. Tadros, M. and Culp, T. (1994). A new structurally and thermally efficient precast sandwich panel system. PCI, Journal, July-August1994,90-101.
 Kent D.C. and park R. (1971). Flexural Members with Confined Concrete, Journal of Structural Division, Proceedings of the American Society of Civil Engineers, Vo l.97, No. ST7,1969-1990
 Park R. and parlay T. (1975). Reinforced Concrete Structures, Johen Wiley and Sons.
 Mohammed Hussin, A. D. (2013). Structural Behavior of Composite Sandwich Slab Panels. Journal of Engineering and Development, Vol. 17, No.4, October 2013, ISSN 1833-7822.
 Noridah, Mohammad. A. I. Khalil, A. A. Abdul Samad, and W.I. Goh. (2014). Structural behavior of Precast Light-Weight Foam Concrete Sandwich Panel with Double Shear Truss Connectors under Flexural Load. Hindawi Publishing corporation ISRN Civil Engineering Volume 2014, 7 Pages.
 Mugahed Amran, Y. H. Raizal, S.M. Rashid, Farzad Hejazi, Nor Azizi Safiee, A. A. Abang Ali. (2016). Response of precast foamed concrete sandwich panels to flexural loading. Journal of Building Engineering,7 (2016)143–158.