Análise numérica do comportamento de um bloco sobre quatro estacas contendo uma estaca defeituosa

Abstract

This work presents the results of a three-dimensional (3D) numerical analysis of mechanical behavior of a piled caps containing a defective pile. The foundation analyzed contains one block of crowing (1,5 m × 1,5 m and 0,5 m height), four piles (5m long, 0,3m diameter), with spacing between shafts corresponding to 3 diameters. The defective region of the pile measure 0,5 m long. This numerical simulations were performed considering different position of occurrences of these anomalies, using software tool (LCPC – CESAR – version 5.0), which has the finite element method as solution. The objective was to verify the influence of a defect, and of the block - soil contact, on the behavior of the foundation and its possible consequences in the superstructure. The results indicate that the defective region has little influence on the strength of the foundation, however, angular distortion values have shown that, although structural safety has not been compromised, if the defective region is located near the block, the safety limit for buildings in which no cracks are allowed, is exceeded. The results also show that the total load resisted by the block - soil contact was significant, reaching values of up to 19%, being also observed a reduction of this plot as the defective region approaches the block.