Building Floors Using Prestressed Unbonded Tendons
(Almeida Filho, Fernando Menezes de)
Building floors using prestressed unbonded tendonsThe present work deals the use of the prestressed unbonded tendons inresidential and commercial concrete buildings, pointing out aspects tothe application with bonded and unbonded prestressing and reinforcedconcrete, regarding the consumption such as concrete, molds andreinforcing steel. Three different structural systems are considered:flat plate and columns; waffle slab and columns and waffle slab (nonprestressed) in prestressed strip beams supported by columns. Casestudies are presented with the use of the software of structuralanalysis TQS, which is based on the grillage analogy method. Theconsumption of materials is compared for the two referred prestressingsystems, discussing the limits of their application. Based on thedeveloped analyses, the study supplies satisfactory conclusions for useof the prestressing systems (bonded and unbonded), compared toreinforced concrete systems. With relation to the consumption ofmaterials, the use of bonded tendons is a bit more cost effective,however, with smaller productivity than tendons with prestressedunbonded tendons, being the last one the more usual prestressingsystems. Still, the system of prestressed bonded tendons was shown moreeconomical, of the point of view of materials consumption, however, itis a system with inferior productivity to the solutions withprestressed unbonded tendons adopted in civil engineering officesnowadays
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