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Nonlinear Finite Element Analysis of Punching Shear Behavior of Flat SlabsAuthor: saurabh Agrahari Date: 2019-10-31 Report no: IIIT/TH/2019/119 Advisor:Pradeep Kumar Ramancharla AbstractIn the present situation of building construction around the world, Flat slab is becoming widely popular in the multi-storied buildings due to its advantage and ease of construction over the slabs. However, during past earthquakes, many building with flats have performed poorly. This is mainly due to inadequate resistance for punching shear under the lateral loading. Many codes that are available for the design are for the analysis of flat slab under gravity loading. Some provisions exist for punching shear resistance, however, they are inadequate for the analysis of flat slab under lateral loading. Therefore, making it essential to study the behavior of flat slab under lateral loading. As a flat slab is widely constructed all over the world, so to understand the design code followed across different country a flat slab example was designed with IS 456, ACI 318, NZS 3101, Euro code design codes and comparisons are made. But as the design code has limitations and past punching shear failures, As part of this research, punching shear behavior of flat slab was studied when subjected to lateral loading. Nonlinear finite element method is used to carry out the numerical modeling of flat slab subjected to appropriate lateral loading and boundary conditions. A MATLAB tool was developed to carry out nonlinear finite element analysis of concrete flat slab subjected to the lateral static loading. flat plate along with 4 column was modeled, lateral loads are applied and Nonlinear analysis is carried out by using the Newton-Raphson method. Stress and Displacement behavior is studied. Further as a part of this study, to understand the punching shear behavior of a reinforced concrete flat slab was subjected to dynamic lateral loading in the form of earthquake loading. The 3D modeling of the reinforced flat slab was done using a finite element method in ABAQUS by providing appropriate mesh size and boundary conditions. The material parameter taken is the Concrete damaged plasticity model in ABAQUS. Considering Carreira and Chu concrete stress and strain behavior. Linear and Nonlinear finite element analysis are performed. This model was used to study the punching shear behavior of reinforced concrete flat slab under varying reinforcement ratio, column dimensions, flat slabs types, etc. are shown. Full thesis: pdf Centre for Earthquake Engineering |
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