Análise de modelos de cálculo de flecha em lajes de concreto armado.

Abstract

This work aims to compare the results of deflections of reinforced concrete slabs obteined through three simplified calculation methods with experimental results for three studies already performed at the UNISC. Therefore, it was decided to analyze the behavior of three unidirectional ribbed slabs: one was built with four ribs of normal joists; another was composed with four ribs of latticework joists; and another slab was built in real-scale with normal joists too. All models employed EPS as filling elements and prefabricated beams. The results of deflections obteined from the tests for each case were taken and compared with theoretical results of deflections obteined through three simplified methodologies for slab’s deflections predictions: Branson’s formula, recomended by NBR 6118:2014; Bilinear method of the CEB; and practical formula of the CEB, in order to identify which of these simplified methods best resembles the actual behavior of deflections in reinforced concrete slabs. After the composition of the diagrams of moment versus deformation for each case, one can delimit which of the three simplified methods under analysis best resembles the deformations of reinforced concrete slabs.