Comparação experimental entre tipos de armadura de cisalhamento para combate à punção em lajes cogumelo de concreto armado: Stud rails e Double headed studs
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Data
2009-09-29
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Universidade Federal de Goiás
Resumo
This research presents the results of an experimental comparison between the types of shear reinforcement "stud rails" and "double headed studs" to combat the punching shear of a reinforced concrete flat slabs. It also presents a comparison of experimental results with those provided under the ACI 318/2005, CEB-FIP MC/1990, EUROCODE 2/2004 and NBR 6118:2003. The motivation was to investigate the efficiency of these shear reinforcement for the differences between them.
It was tested six slabs of concrete to concentric load, with dimensions of 2400 mm x 2400 mm x 150 mm. It was concreted a column of section 500 mm x 200 mm to 850 mm total height next to the slab. The main variables were the type of shear reinforcement "stud rails" x "double headed studs, the "studs" diameter and the shear reinforcement area per layer. The slabs were tested until the failure.
It was monitored the deflection, reinforcement deformation of bending and shear. All slabs failed by punching with internal surface rupture. The experimental results after being compared with the expected standard in each individual calculation showed conservative values.
Slabs of Group 1 with "stud rails" presented failed loads greater than those in Group 2 with "double headed studs. Codes/standards 318/2005 ACI, CEB-FIP MC/1990, EUROCODE 2 / 2004 and NBR 6118:2003 safely predict the failed loads of all slabs.
The base of the shear reinforcement type "stud rails" moving inside the column may have reduced the failed load of the slab L3.
Shear reinforcement type stud rails it is easer of assembly and play than the type double headed studs .
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Palavras-chave
Concreto armado , lajes de concreto , lajes cogumelo , lajes planas , punção (Engenharia Civil) , armadura de cisalhamento , Concrete, concrete slabs, mushroom slabs, flat slabs , puncture (Civil Engineering) , shear reinforcement , 1. Concreto armado 2. Lajes de concreto 3. Lajes cogumelo Punção 4. Lajes planas 5. Punção (Engenharia civil) 6. Armadura de cisalhamento
Citação
RODRIGUES, David Rosa. Comparison between experimental types of shear reinforcement to combat punch mushroom slabs of concrete, "Stud rails" and "Double headed studs". 2009. 142 f. Dissertação (Mestrado em Engenharias) - Universidade Federal de Goiás, Goiânia, 2009.