Abstract
Post-tensioned unbonded tendons are widely used in flat slabs/plates when there is a demand for large span lengths, durable tendons and a reduction in the weight of structure. For post-tensioned flat slab/plates, different tendon layouts have been discussed in the literature. It is vital to compare the structural response (i.e., deflection and stresses) and the clashing of tendons of the proposed tendon layouts in the literature to select an appropriate layout. Hence, this study focuses on the analysis of three different six-panel flat plates (i.e., panel sizes: 6 m × 6 m, 9 m × 6 m and 11 m × 6 m) with five different tendon layouts, using computer programs ADAPT-Floor Pro and FEM-Design 17, based on linear finite element (FE) analysis. Short-term/long-term deflection and stress due to service load obtained from the computer programs has also been compared, to highlight the differences. Ultimate bending moment of resistance was calculated theoretically for different layouts and compared. Results from the analysis show that, when a higher portion of tendons is concentrated instead of distributed, stresses caused by other structural loads are counteracted best. The layout with all tendons concentrated also has the best results in terms of deflections.
Highlights
Both unbonded and bonded tendons can be used to construct pre-stressed concrete flat slab/plates
It can be seen that there is no significant difference between short-term deflections estimated from both software packages for all three cases
Layout D is a continuation of layout C; some of the distributed tendons from C are concentrated over supports
Summary
Both unbonded and bonded tendons can be used to construct pre-stressed concrete flat slab/plates. Pre-stressed flat slabs/plates with layout (b) may be difficult to execute because of the weaving of tendons in spans (Sørensen 2013). Kosut et al (1985) studied the behavior of post-tensioned four-panel flat plates with distributed and banded tendon arrangements They observed that slabs with banded tendon layouts enhance the ultimate load-carrying capacity and the shear strength of each slab–column connection. Using SAP2000 software, Schokker et al (2002) studied the effect of tendon layout, considering the interior panel of a flat slab of 7.1 m × 6.1 m, and found that 100% of tendons banded along the column line in each direction gave a good structural response (i.e., deflection, stress control). It can be seen from the literature that tendon layout effect when the panel dimensions are unequal has not been investigated substantially
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