engleski

Evaluation of stiffness of prestressed concrete slabs (with post-tensioning) of large span on the basis of theoretical and experimental results

Application of post tensioned slabs began in America in early 60-ies, and used in Europe several years later. Generally, the principle consists in applying prestressing load in slab, which, beside the membrane compressive component, achieves the effect of counter load perpendicular to the plate. This is achieved by keeping the shape of tendons line within the slab which deflecting forces act in the direction of tendons curvature. Technical and economic advantages are reflected in the wider span and with a slenderer slab dimensions. Reduced initial deflections (sometimes is the initial elevation in calculation), but predominantly compressive stress in the slab with localization of boundary tensile stress has a beneficial effect on reducing long-term deflection. Since the application of prestress force, perform 3 days after concreting, that’s why the speed of construction is faster because the formwork can be removed.

Post tensioned slabs; finite element beam; shear lag; prestress load modeling

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