Estudo das condições de segurança de edifícios durante a recuperação estrutural de pilares

Abstract

Structures deteriorate under action of environmental hazards and other conditions, what requiring, for the maintenance of the service life, interventions that can vary from a simple superficial repair to a elaborated installation of einforcements. In the structural safety's evaluation of existing buildings, the guidelines used for project become inappropriate, as many of the parameters adopted generically in project can be now studied by an investigation in situ, which reduces significantly the relative uncertainties to the related variables. The aim of this dissertation is to analyze the safety condition of columns of residential buildings submitted to the structural repair. Also, it evaluates some procedures, based on safety, for execution of the repair. A methodology is proposed for intervention of those elements in terms of the global safety's coefficient, from considerations done in the evaluation of the resistances and internal forces in the cross section as well. According to the procedures, the study of the representative values of the loads that act in short periods of time of the repair work and safety's partial coefficients that will be applied to the columns, during such a process. Internal forces will be generated by commercial softwares, where input data are those specific of the analyzed structure, according to the time of the repair intervention and reference period related to the execution of the services, which correspond to few months. The presented methodology focus on normal conditions of occupation of the apartments by the tenants in the investigated buildings. Then, it is taken into account the maintenance of a minimum level of safety in the development of the works, according to a probability of failure adjusted to the current conditions of the structure and the previous response. As an application of the proposed technique, it is presented the safety's evaluation of columns located in the garage of two buildings. It was simulated the service of structural repair due to the process of initial reinforcement corrosion. It is expected that this dissertation contributes to future works culminating in the elaboration of codes for evaluation and structural repair.