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Numerical Analysis of External Post-Tensioned Concrete Slabs

Sadiri Abolhassani, Ramin | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 50279 (53)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Eskandari , Morteza; Kazemi, Mohammad Taghi
  7. Abstract:
  8. In this research a new type of external post-tensioned concrete slab is proposed. In this system, the tension force of cables is used as upward force acting at the bottom face of slab. To achieve this behavior, two short concrete columns mounted at the bottom face of slab and act as the middle supports for the cables. Based on the cable force and its angle, an upward force is applied to the slab at the location of columns. In fact, a truss structure comprising of the concrete slab as compression cords, cables as tension cords, and columns as ties. By virtue of Kirchhoff’s plate theory, an analytical treatment of the slab under gravity loads is addressed. For analytical study, it is assumed that the problem is linear and the superposition technique is valid. The analysis is performed on a simply supported rectangular slab made on an elastic material and cracking of concrete is taken into account by reducing the flexural rigidity of slab by an appropriate reduction factor. The effects of cables are also modeled as equivalent springs. This analysis helps to understand the overall behavior of the proposed slab. For more detailed analysis, the slab is modeled by a commercial FEM program, namely ABAQUS. With the aid of nonlinear analysis, the behavior of slab under gravity loads is investigated up to its failure. The effects of parameters like location of columns, cable tension force, and length of columns on the behavior of slab are considered. For a typical long span, various types of floor systems are designed and compared. Finally, the advantages and disadvantages of the proposed system are discussed
  9. Keywords:
  10. Nonlinear Analysis ; Thin Plates ; Concrete Slabs ; Finite Element Analysis ; Prestressed Concrete Slabs ; Floor System

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