Analysis of Behaviour of Post Tensioning Slab for Various Framing Under the Influence of Lateral Load
Keywords:
Nonlinear Static Analysis, PT Slab, Prestressed Concrete, Base Shear, Punching Shear, DeflectionAbstract
Looking at modern trend of construction post tensioning system is used in constructions over pre-stressing systems as post tensioning has less losses compared to prestresssing and also we can give any shape to tendons in post tensioning. Hence Post Tensioned (PT) tendons are added in flat slab as post tensioning gives superior performance because the PT flat floor systems provide improved crack and deflection control, and allow relatively large span to thickness ratios of the order of 35 to 45 which is less in case of RC up to 30. It also reduces floor to floor height, get lighter structures. Post tensioning also gives construction efficiency, sustainability and durability. But understanding and analysis of flat floor system behavior subjected to lateral forces and/or displacements in areas prone to earthquake, i.e. high seismic zone regions, is matter of concern. It becomes a subject of interest to find the seismic force resisting capacity of such buildings in the presence or absence of Lateral Force Resisting System. For that nonlinear static analysis is used as it is partial and relatively simple intermediate solution to complex problem of predicting force and deformation demands imposed on a structure and its elements due to ground motion. This analysis is an attempt to evaluate the real strength of structure and it is a useful and effective tool for performance based design.
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