Analysis Of Prestressed Reinforced Concrete Slab With Shell Elements

This thesis puts forward a general train of thought about "load pathes" in the designing of concrete slabs and simply analyze the ways to determinate the load pathes of external actions on the prestressed concrete floor .It proceeds a summary of the current design methods of prestressed reinforced concrete slab (Simple Frame. Equivalent Frame and Finite Element analysis) and discusses the advantages of finite element method in design of prestressed slab. Aiming at applying shell elements to analyze the prestressed concrete slab, the thesis introduces and analyzes constructions of three types of shell elements (Flat-Panel Type, Degenerated Type and Bending Shell Type), especially, it takes much discussion on flat-panel shell elements. Besides, it derives in details the whole process of analyzing slabs mechanically in the use of shell elements from the basic principle of finite elements. Meanwhile, it puts forward the basic idea of "the twice analytical method" in the finite elements analysis of the prestressed concrete slab and the train of thought that the position of putting the prestressed bars (bunch) together should be analyzed as a three-dimensional spacial beam. It also gives the general process and the items that should be paid attention to for application of analysis software to the analysis of prestressed reinforced concrete slab with shell elements(namely the realization of "the twice analytical method"). At the same time, for better explaining the details of this way of analysis, the thesis finally applies the general finite elements analysis software of ANSYS, which is used widely at home and abroad, to analyze an actual case from the initial modeling to the final disposing.