Innovative techniques used to plumb two 57 m height concrete buildings leaning 3.8 and 3.1 %

Abstract There are about a 100 buildings visibly inclined in the city of Santos. Until the year 2000 some attempts were realized to reduce inclinations of some of those buildings without success. This paper presents the work done to plumb two buildings: Tower A and Tower B of the Condominium Nuncio Malzoni, with 57 m height that were inclined 3.8 and 3.1 %, respectively. Tower A was 2.08 m out of plumb and was brought plumb through an innovative technique in 2000. Another technique, also innovative, was accomplished to correct Tower B, 1.70 m out of plumb in 2010. Before starting the works to plumb the two buildings, a safety assessment analysis was undertaken through a complex computational analysis. The analysis showed that strengthening the structure of Tower A was urgent, since the building could be at risk of structural collapse. Due to structural differences, the Tower B was not in risk of collapse at this time. The inclination of these buildings was corrected using different techniques, which are presented in this paper.