Abstract

GUERRA-ROJAS, Rodrigo Alejandro. Behavior analysis of maximum stresses induced in rigid pavements due to partial replacement of slabs. Iteckne [online]. 2020, vol.17, n.2, pp.98-109.  Epub Mar 01, 2021. ISSN 1692-1798.  https://doi.org/10.15332/iteckne.v17i2.2470.

The objective of this study is to analyze the behavior of the maximum stress induced in concrete slabs as a result of modifications in their geometry. This condition is due to maintenance operations that consider the partial replacement of paving slabs. The analysis is carried out by modeling finite elements of the pavement in sections that consider 2 transversal slabs and 3 longitudinal slabs. A square geometry, traditionally used in Chile, of 3,500 mm (length) x 3,500 mm (width) has been used as the base for each slab. The effect of partial replacement of thecentral slab by variable lengths in combination with variations in slab thickness of 150 mm, 160 mm, 180 mm and 200 mm has been studied for 3 types of subgrade. The models have been solved by means of finite element analysis with EverFE 2.26 software, which has been widely used for the study of rigid pavements. The maximum stress levels induced by the most critical position of the load -single axle with dual tires on the edge of the slab- have been studied. The results suggest a limit configuration in the partial replacement of slabs in order to control the maximum stress levels induced and thereby avoid the reduction of their useful life. The determined increase in the stress levels in the slab is between 3.63 and 7.61% and these values allow calculating, by fatigue models, a decrease in the total number of load applications of 27% for slab thicknesses of 150mm (K=0.064 MPa/mm) and 14% for slabs of 200mm (K=0.064 MPa/mm) thickness, which is reflected in a reduction in their useful life.

Keywords : Rigid pavement; tensile stress; concrete slabs; finite element analysis; fatigue models.

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