Análise da influência da sequência construtiva no desempenho de fundação por radiers estaqueados

Analysis of the influence of construction sequence on the performance of raft pile foundation

Abstract

This article presents the analysis of the influence of constructive sequence on the performance of a foundation by raft piles of a building in concrete wall structure. The settlements were monitored in the field and estimated by the finite element method, with and without the consideration of soil-structure interaction (SSI) for the analysis of the redistributions of displacements and efforts in the foundation. The construction process was carried out in 4 stages per floor in a diagonal direction. The settlements in quadrant 1 were the largest, because of the partial execution of the building. In the last stage opposite quadrant 1, there were negative readings of settlements, which indicates lifting of the raft. Monitoring by stages showed the relation between the number of floors and SSI. With the increase in the stiffness of the structure, the maximum differential settlements reduced from 13 mm to the ground floor to 3 mm on the fifth floor. About 62% of the loads were transmitted to the piles and about 38% to the raft. The results showed the importance of a combined analysis of soil-structure interaction with consideration of the construction stage to understand the behavior of foundations by raft piles from a building in concrete wall structure.