EXPERIMENTAL BEHAVIOR OF BONDED & UNBONDED MULTISTRAND FULL SCALE PRE-STRESSED FLAT SLABS

Ashraf M. EL-shihy, Hamdy A. K. Shehabeldin, Osman E. A. Shaalan, Ragab S. Mahmoud

Abstract


Flat slabs are economical structural systems for medium height buildings. Pre-stressed concrete flat slabs
have the additional advantages that longer spans can be used with less significant deflection problems. In
addition, pre-stressing reduces cracking in the slab so, it can be used for water tight floors. Moreover,
greater shear strength can be obtained for the same slab depth. There are two types of post-tensioned
concrete flat slabs: bonded and unbonded. In recent years, due to its several advantages, a pre-stressed
concrete flat slab is used in factories having heavy live loads and large spans, which is the case study of
this research. Multi-strand tendons are used in reinforcing the slab due to heavy loads and large spans.
The purpose of full-scale investigation is to reduce the shortcomings of scaled models and observe the
actual behavior of stress development, strains and all other results with various stages of loads. There are
different ways to place the tendons in a flat slab. The most common solution is to place distributed
tendons in the largest span and banded concentrated tendons in a column strip in the shortest span, and
this is considered in the present study. The purpose of this research is to study the behavior of a prestressed
concrete flat slab–column connections using both unbonded and bonded multi-strand tendons of
full–scale factory floor under the design service live loads. The studied slabs have a three bays of 12
meters span by six bay of 6 meters span with 350 mm slab thickness without drop panel

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