TIME-DEPENDENT RELIABILITY OF REINFORCED CONCRETE CONSIDERING CHLORIDE PENETRATION VIA BOUNDARY ELEMENT METHOD

Authors

  • GIOVANNI PAIS PELLIZZER FEDERAL DE MATO GROSSO DO SUL, FACULDADE DE ENGENHARIAS, ARQUITETURA E URBANISMO E GEOGRAFIA– AV. COSTA E SILVA, CIDADE UNIVERSITÁRIA, 79070-900, CAMPO GRANDE - MS, BRASIL HTTPS://ORCID.ORG/0000-0002-2815-3151
  • HENRIQUE MACHADO KROETZ UNIVERSIDADE FEDERAL DO PARANÁ, CAMPUS PONTAL DO PARANÁ – CENTRO DE ESTUDOS DO MAR – AV. BEIRA MAR S/N, P.O.BOX: 61, 83255-976 PONTAL DO SUL - PONTAL DO PARANÁ – PR, BRASIL HTTPS://ORCID.ORG/0000-0003-3977-1112
  • EDSON DENNER LEONEL UNIVERSIDADE DE SÃO PAULO, DEPARTAMENTO DE ENGENHARIA DE ESTRUTURAS – AV. TRABALHADOR SÃO CARLENSE, 400, 13566-590, SÃO CARLOS –SP, BRASIL HTTPS://ORCID.ORG/0000-0002-7842-0334
  • ANDRE TEOFILO BECK UNIVERSIDADE DE SÃO PAULO, DEPARTAMENTO DE ENGENHARIA DE ESTRUTURAS – AV. TRABALHADOR SÃO CARLENSE, 400, 13566-590, SÃO CARLOS –SP, BRASIL HTTPS://ORCID.ORG/0000-0003-4127-5337

DOI:

https://doi.org/10.1590/1679-78255885

Abstract

STRENGTH DEGRADATION OF STRUCTURAL MATERIALS IS AN INEVITABLE PROCESS, DUE TO DELETERIOUS ACTIONS SUCH AS CORROSION AND FATIGUE. THESE PHENOMENA ARE ALSO TYPICALLY RANDOM, WITH DEGRADATION RATES AND STARTING TIME OF DEGRADATION PROCESS LARGELY UNCERTAIN. IN THE PARTICULAR CASE OF REINFORCED CONCRETE STRUCTURES, CORROSION OF REINFORCING BARS CAUSED BY CHLORIDE IONS IS ONE OF THE MAIN PATHOLOGICAL MANIFESTATIONS. PAST STUDIES ON THE TIME-VARIANT RELIABILITY OF REINFORCED CONCRETE STRUCTURES SUBJECT TO CORROSION HAVE RELIED ON SIMPLIFIED ANALYTICAL MODELS FOR ESTIMATING THE DEPASSIVATION TIME, I.E., THE TIME REQUIRED FOR CHLORIDE CONCENTRATION AT CONCRETE/STEEL INTERFACES TO BECOME CRITICAL. THIS STUDY CONTRIBUTES WITH AN ACCURATE MODELLING OF CHLORIDE DIFFUSION THROUGH CONCRETE USING THE BOUNDARY ELEMENT METHOD, WHICH IS EMPLOYED FOR THE FIRST TIME WITHIN A TIME-VARIANT RELIABILITY FRAMEWORK. CUMULATIVE FAILURE PROBABILITIES ARE EVALUATED IN TIME BY CONSIDERING RANDOM DEPASSIVATION TIMES, RANDOM CORROSION EVOLUTION, AND RANDOM LOAD PROCESSES. THE TIME-VARIANT RELIABILITY PROBLEM IS SOLVED USING MONTE CARLO SIMULATION. AN APPLICATION EXAMPLE IS PRESENTED, DEMONSTRATING THE CAPABILITIES OF THE PROPOSED FRAMEWORK.

Published

2020-09-02

Issue

Section

MecSol 2019 São Carlos