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TIME-DEPENDENT RELIABILITY OF FRP STRENGTHENED REINFORCED CONCRETE BEAMS UNDER COUPLED CORROSION AND CHANGING LOADING EFFECTS

Abstract : LIFETIME ASSESSMENT OF DETERIORATING STRUCTURES NOWADAYS FOCUSES ON THE ISOLATED EFFECTS OF THE MAIN DETERIORATION PROCESSES. HOWEVER, IT IS PARAMOUNT TO STUDY THE COUPLED EFFECTS OF VARIOUS DETERIORATION PROCESSES BECAUSE SUCH INTERACTIONS COULD REDUCE STRUCTURAL INTEGRITY ; STRENGTHING IS AN ESSENTIAL TOOL TO COMPENSATE STRENGTH LOSSES AND/OR TO SUPPORT ADDITIONAL LOADS. EXTERNALY BONDED FIBER REINFORCED POLYMER FRP COMPOSITES ARE AN INCREASINGLY ADOPTED TECHNOLOGY FOR THE RENEWAL OF EXISTING CONCRETE STRUCTURES. THREE MAIN OBJECTIVES WERE CONSIDERED IN THE PRESENT STUDY. FIRST IS TO PROPOSE TIME-DEPENDENT PROBABILISTRIC MODELS OF STEEL REINGORCEMENT AND LIVE LOAD. SECOND IS TO PERFORM PROBABILISTIC ANALYSIS IN TERM OF TIME DEPENDENT FAILURE PROBABILITY OR RELIABILITY INDEX. FAILURE MODES OF FRP STRENGTHENED RC BEAM INCLUDED IN THE SURVEY WERE PROBABILISTICALLY SIMULATED USING FORM METHOD. THESE FAILURE MODES ARE BASED ON ANALYTICAL EXPRESSIONS REPORTED IN PREVIUS STUDIES. THIRD IS TO DEVELOP A MONTE-CARLO SIMULATION BASED ON NEURAL NETWORKS AND FINITE ELEMENT METHOD WHICH AIMS AT VERIFYING THE RESULTS OF RLIABILITY ANALYSIS USING FORM METHOD ; THE RESULTS OF THIS WORK BRING TO LIGHT THE MANY VARIABLES AFFECTING THE RELIABILITY OF STRENGTHENED MEMBERS AND THE NEED FOR CONTINUING RESEARCH TO BETTER DESCRIBE THESE VARIABLES. TWO VARIABLES OF PARTICULAR SIGNIFICANCE, REQUIRING EXTENSIVE FURTHER STUDY, ARE THE STATE OF THE EXISTING STRUCTURE WHEN STRENGTHENING IS APPLIED AND THE COMPLEXITY OF LOADS ACTINF ON THE STRUCTURE
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https://tel.archives-ouvertes.fr/tel-01022301
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Submitted on : Thursday, July 10, 2014 - 11:35:10 AM
Last modification on : Wednesday, October 20, 2021 - 3:19:19 AM
Long-term archiving on: : Tuesday, April 11, 2017 - 12:02:05 PM

Identifiers

  • HAL Id : tel-01022301, version 1

Citation

Osama Ali. TIME-DEPENDENT RELIABILITY OF FRP STRENGTHENED REINFORCED CONCRETE BEAMS UNDER COUPLED CORROSION AND CHANGING LOADING EFFECTS. Engineering Sciences [physics]. Université d'Angers, 2012. English. ⟨tel-01022301⟩

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