Resistência à força cortante de lajes alveolares preenchidas de pequena altura

Abstract

The use of precast concrete elements in the construction industry reflects an evolution in constructive terms, it represents the application of the system rationalization and improvement of building techniques. In this study, it evaluates the behavior and resistance of prestressed hollow core slabs with hollow core filled at a later stage to its concrete and submitted to ruin by shear force. The influence of shrinkage of concrete filling of the hollow core, the fill extent and the number of hollow core filled in the shear strength of the hollow core slab is evaluated. Moreover, it is also evaluated, the interference of the structural layer in the shear strength of prestressed hollow core slabs. By comparing the results obtained in physical models with the results of previously published equations for hollow core slabs, it analyzes the validity of these balances between the hollow core slabs with hollow core filled at a later stage to the release of prestressing. The results show the need to change some normative models in order to adapt them to appropriate representation of the behavior of filled prestressed hollow core slabs, particularly for slabs of smaller size, which is a model widely used in Brazil, mainly in the region Centro-Oeste.