Momentos fletores negativos nos apoios de lajes formadas por vigotas de concreto protendido / Bending moments in the support of slabs made by precast prestressed concrete joist

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

This work aims the structural analysis in a type of slabs that is increasing its utilization in Brazil. These slabs are made by precast prestressed joists. The main objective of this work is the evaluation of the behavior of this type of slabs by theoretical analysis of the bending moments on the supports of continuous slabs. In the theoretical analysis was carried out the consideration of the non-linear of the concrete behavior through the moment x curvature relationship of Model Code CEB-90 add incremental load technique. This methodology was appraised with experimental results of panels of hollow core slabs and this methodology was able to represent satisfactorily the behavior of slabs made by precast prestressed elements. Analysis of representative cases of slabs with precast prestressed joists was carried out and the main conclusions were: a) the use of continuity aids highly to decrease the displacements; b) displacements were practically independent of reinforcement ratio on the support; c) the development profiles of the bending moments had a standard behavior to the analysed cases; d) this behavior was independent of reinforcement ratio on the support and e) the reinforcement ratio on the support affected practically the ultimate load value.

ASSUNTO(S)

non-linear behavior bending redistribution precast slabs redistribuição de esforços. precast prestressed joist laje pré-moldada vigota protendida comportamento não-linear

ACESSO AO ARTIGO

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