Experimental and numerical investigation of slabs on ground subjected to concentrated loads
Tóm tắt
An experimental program is presented where a slab on ground is subjected to concentrated loading at the centre, the edges and at the corners. Analytical solutions for the ultimate load capacity fit well with the results obtained in the tests. The non-linear behaviour of the slab is captured by performing nonlinear finite element analyses. The soil is modelled as a no-tension bedding and a smeared crack approach is employed for the concrete. Through a parametric study, the finite element model has been used to assess the influence of subgrade stiffness and shrinkage. The results indicate that drying shrinkage can cause severe cracking in slabs on grade.
Tài liệu tham khảo
Beckett D., Comparative tests on plain, fabric reinforced and steel reinforced concrete ground slabs, Concrete 24, 1990, 43–45
Falkner H., Huang Z., Teutsch M., Comparative study of plain and steel fiber reinforced concrete ground slabs, Concrete International 17, 1995, 45–51
Westergaard H. M., New formulas for stresses in concrete pavement of airfield, Transactions of ASCE 113, 1948, 425–444
Meyerhof G. G., Load-carrying capacity of concrete pavements, Journal of the Soil Mechanics and Foundations Division 88, 1962 89–116
Shentu, Jiang D., Hsu, Load-Carrying Capacity for Concrete Slabs on Grade, Journal of Structural Engineering 123, 1997, 95–103
Al-Nasra M., Wang L. R. L., Parametric study of slabongrade problems due to initial warping and point loads, ACI Structural Journal 91, 1994, 198–210
Losberg A., Pavements and slabs on grade with structurally active reinforcement, ACI Journal Proceedings 75, 1978, 647–657
Rao K., Singh S., Concentrated LoadâĂŘCarrying Capacity of Concrete Slabs on Ground, Journal of Structural Engineering 112, 1986, 2628–2645
ACI, 360R-10. Guide for design of slabs-on-ground, American Concrete Institute, United States, 2010
Concrete Society, Concrete industrial ground floors: A guide to design and construction, 2003
Baumann R. R., Weisgerber F. E., Yield-Line analysis of slabs-on-grade, Journal of Structural Engineering 109, 1983, 1553–1568
Standards Norway, NS-EN 1992-1-1:2004+NA:2008. Eurocode 2: Design of concrete structures — General rules and rules for buildings, Standards Norway, Norway, 2008
CEB-FIP, Model code 1990, Thomas Telford, London, 1993
Knapton J., Ground bearing concrete slabs: specification, design, construction and behaviour, Thomas Telford, London, 2003
Heggen R., Seglem F., Ground bearing slabs subjected to concentrated loads, Master Thesis, Norwegian University of Science and Technology, Trondheim, Norway, 2010, (in Norwegian)
Standards Norway, NS-EN 12390-3:2009. Testing hardened concrete — Part 3: Compressive strength of test specimens Standards Norway, Norway, 2009
Standards Norway, NS 3676. Concrete testing — Hardened concrete — Modules of elasticity in compression, Standards Norway, Norway, 1987
TNO DIANA BV, DIANA Finite element analysis Release 9.4, The Netherlands, TNODIANABV, 2012
Alani A. M., Aboutalebi M., Analysisofthesubgrade stiffness effect on the behaviour of ground-supported concrete slabs, Structural Concrete 13, 2012, 102–108
Chou Y., Stress Analysis of Small Concrete Slabs on Grade, Journal of Transportation Engineering 110, 1984, 481–492
Planas J., Elices H., Shrinkage eigen stresses and structural size effect, In: Bazant Z.P. (Ed.), Fracture Mechanics of Concrete Structures, London: Elsevier; 1992