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.

中文翻译：

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预应力混凝土平板中不同无粘结筋布置的参数化研究

当需要大跨度、耐用的筋和减轻结构重量时，后张无粘结筋广泛用于平板/板。对于后张平板/板，文献中已经讨论了不同的钢筋布局。比较文献中建议的钢筋束布局的结构响应（即挠度和应力）和钢筋束的碰撞以选择合适的布局至关重要。因此，本研究的重点是使用计算机程序 ADAPT 分析具有五种不同肌腱布局的三种不同的六面板平板（即面板尺寸：6 m × 6 m、9 m × 6 m 和 11 m × 6 m） -Floor Pro 和 FEM-Design 17，基于线性有限元 (FE) 分析。还比较了由于从计算机程序获得的服务负载而导致的短期/长期挠度和应力，以突出差异。理论上计算了不同布局的极限弯矩并进行了比较。分析结果表明，当更多的钢筋束集中而不是分布时，由其他结构载荷引起的应力得到最好的抵消。所有筋集中的布局在挠度方面也有最好的结果。