上反柱帽预应力无梁楼盖分析

Analysis on prestressed flat slab with reverse column-cap

预应力无梁楼盖广泛应用于地下车库,当其上覆土较厚时,采用上反柱帽可达到增大室内空间和简洁美观的目的。而上反柱帽预应力无梁楼盖如何设计计算,却未有相关报道。本文利用SAP2000对上反柱帽和传统柱帽的预应力无梁楼盖分别进行了分析对比,结果表明:在均布荷载作用下,两种柱帽的弯矩和挠度基本相同;采用上反柱帽后预应力筋的矢高有较大提高,但其预应力效应的变化并不显著。

Prestressed flat slab is used largely in underground garage.In some circumstances,the reverse column-cap can be used in the roof of the garage.Therefore the indoor space can be increased and the interior looks aesthetically and concise.However,there are no any reports on the calculation and design of prestressed flat slab with reverse column-cap.Prestressed flat slab with reverse column-cap and with traditional column-cap were analyzed and compared,using the software SAP2000.Analytic results indicated that the bending moment and deflection of different column-cap models, under distributed load,are basically identical.Moreover,the prestressed effect of reverse column-cap is limited,even if the rise of prestressed reinforcement increases.