Abstract
This paper discusses the experimental results on the flexural behavior and deflections of posttensioned concrete flat plates depending on tendon layout. One reinforced concrete flat plate and two posttensioned concrete flat plates were manufactured and tested. One-way posttensioning layout and two-way posttensioning layout were considered in this paper. The load-deflection behavior and modes of crack are presented from the test results. Posttension systems effectively controlled crack and deflection. One-way and two-way posttensioning layouts both showed similar maximum load. However, serviceability improved with two-way posttensioning layout compared to one-way posttensioning layout. Also, the yield-line theory was applied to predict the ultimate load for the posttensioned flat plates. The comparison between the test results and estimation by yield-line analysis generally showed good agreement.
Highlights
Posttensioned concrete flat plate structure has many advantages such as reduction of overall member thickness and simpler construction
The banded tendon layout was applied in column strip of x-direction and single tendons were distributed in ydirection of slab
The flexural failure demonstrated that the banded tendon layout of column strip resisted the punching shear effectively
Summary
Posttensioned concrete flat plate structure has many advantages such as reduction of overall member thickness and simpler construction These systems have exhibited good performance in terms of ductility and flexural capacity. Kosut et al [2] experimentally evaluated the behavior of posttensioned flat plates with distributed and banded tendon arrangement in each direction. They presented that the banded tendon on the column strip can resist the punching shear failure and distributed tendon can improve flexural capacity. Ramos et al [3] presented the experimental results of flat plates with tendon under punching shear They showed the results that load capacity decreased as the distance between the tendons and the column increased. They verified the accuracy of the proposed equation in comparison with test data and ACI design code
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