International Concrete Abstracts Portal

Title: Evaluation method for safety conditions of buildings during the structural repair of columns

Author(s): T. J. DA Silva, N. F. Monteiro

Publication: IBRACON

Volume: 3

Issue: 1

Appears on pages(s): 95 136

Keywords: structural safety; column repair; assessment of structures; safety factors.

DOI:

Date: 3/31/2010

Abstract:
The structures deteriorate under the action of environmental hazards and other factors and require interventions which can vary from a simple superficial repair to a more complex reinforcement. The safety analysis in existing buildings differs in several aspects of that established in the project, mainly because the parameters generically adopted by the author of the project can be now studied by an investigation on-site at the moment of intervention. This work analyzes the safety conditions in which the services of structural repair of columns are made, and it presents a methodology that takes into account the reduction of uncertainties related to resistance and load parameters. The structure of the building is modeled in calculation software in order to obtain a more compatible stress with the reduced analyzed period. The methodology indicates the adjustment of the safety factors together with a global factor of safety for columns that allows the determination of a strategy for repairs to be performed, preserving a probability of failure coherent with the existence of the structure. As a result of the proposed methodology, the part of the concrete and steel sections that will be possible to be removed from the columns in a structural repair of a building due to a process of corrosion that will affect the reinforcement structures or deteriorate the concrete. The methodology proposed was applied to three buildings and one of them is shown in this paper. The structural elements of application were the columns of the garage floor of a 25 floor building with a simulation of a structural repair due to a process of initial corrosion of the reinforcement structures. After the analysis, it was possible to define the procedure to be adopted for each column