Hand verification for flexural strength of existing R.C. floors subject to degradation phenomena

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Abstract

In the present paper, a simplified model for hand verification of the flexural and shear strength of existing corroded T beams cast in place of lightened R.C. orthotropic slabs forming floors is presented and discussed. Diffused and pitting corrosion on steel bars, compressive concrete strength degradation and concrete bond strength degradation are included in the model. The original contribution of the paper is evaluation of the flexural and shear strength considering both the cases of strain compatibility and absence of compatibility and considering the main parameters governing the corrosion process. An arch-resistant model for the calculus of the flexural and shear strength of the beam was adopted in the absence of strain compatibility, while the plane section theory was adopted for the case of strain compatibility. No punching shear is considered. This approach is simple and can be applied on the basis of the experimental information available (carbonation test, chloride content, measurement of the pitting in the bar, gravimetric method for general corrosion) or by utilizing analytical expressions calibrated on the knowledge of the corrosion current intensity determined by linear polarization resistance measurement (LPR). The model was also verified against experimental results recently obtained by the authors.
Lingua originaleEnglish
pagine (da-a)26-38
Numero di pagine13
RivistaCase Studies in Structural Engineering
Volume4
Stato di pubblicazionePublished - 2015

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Bending strength
Shear strength
Corrosion
Degradation
Pitting
Concretes
Punching
Carbonation
Bond strength (materials)
Arches
Polarization
Steel

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction

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@article{16b177404f244677a41035495277a12f,
title = "Hand verification for flexural strength of existing R.C. floors subject to degradation phenomena",
abstract = "In the present paper, a simplified model for hand verification of the flexural and shear strength of existing corroded T beams cast in place of lightened R.C. orthotropic slabs forming floors is presented and discussed. Diffused and pitting corrosion on steel bars, compressive concrete strength degradation and concrete bond strength degradation are included in the model. The original contribution of the paper is evaluation of the flexural and shear strength considering both the cases of strain compatibility and absence of compatibility and considering the main parameters governing the corrosion process. An arch-resistant model for the calculus of the flexural and shear strength of the beam was adopted in the absence of strain compatibility, while the plane section theory was adopted for the case of strain compatibility. No punching shear is considered. This approach is simple and can be applied on the basis of the experimental information available (carbonation test, chloride content, measurement of the pitting in the bar, gravimetric method for general corrosion) or by utilizing analytical expressions calibrated on the knowledge of the corrosion current intensity determined by linear polarization resistance measurement (LPR). The model was also verified against experimental results recently obtained by the authors.",
keywords = "Arch strength mechanism, Bond, Building and Construction, Civil and Structural Engineering, Corrosion, Pitting, R.C. floor, T beam",
author = "Francesco Cannella and Liborio Cavaleri and Giuseppe Campione",
year = "2015",
language = "English",
volume = "4",
pages = "26--38",
journal = "Case Studies in Structural Engineering",
issn = "2214-3998",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - Hand verification for flexural strength of existing R.C. floors subject to degradation phenomena

AU - Cannella, Francesco

AU - Cavaleri, Liborio

AU - Campione, Giuseppe

PY - 2015

Y1 - 2015

N2 - In the present paper, a simplified model for hand verification of the flexural and shear strength of existing corroded T beams cast in place of lightened R.C. orthotropic slabs forming floors is presented and discussed. Diffused and pitting corrosion on steel bars, compressive concrete strength degradation and concrete bond strength degradation are included in the model. The original contribution of the paper is evaluation of the flexural and shear strength considering both the cases of strain compatibility and absence of compatibility and considering the main parameters governing the corrosion process. An arch-resistant model for the calculus of the flexural and shear strength of the beam was adopted in the absence of strain compatibility, while the plane section theory was adopted for the case of strain compatibility. No punching shear is considered. This approach is simple and can be applied on the basis of the experimental information available (carbonation test, chloride content, measurement of the pitting in the bar, gravimetric method for general corrosion) or by utilizing analytical expressions calibrated on the knowledge of the corrosion current intensity determined by linear polarization resistance measurement (LPR). The model was also verified against experimental results recently obtained by the authors.

AB - In the present paper, a simplified model for hand verification of the flexural and shear strength of existing corroded T beams cast in place of lightened R.C. orthotropic slabs forming floors is presented and discussed. Diffused and pitting corrosion on steel bars, compressive concrete strength degradation and concrete bond strength degradation are included in the model. The original contribution of the paper is evaluation of the flexural and shear strength considering both the cases of strain compatibility and absence of compatibility and considering the main parameters governing the corrosion process. An arch-resistant model for the calculus of the flexural and shear strength of the beam was adopted in the absence of strain compatibility, while the plane section theory was adopted for the case of strain compatibility. No punching shear is considered. This approach is simple and can be applied on the basis of the experimental information available (carbonation test, chloride content, measurement of the pitting in the bar, gravimetric method for general corrosion) or by utilizing analytical expressions calibrated on the knowledge of the corrosion current intensity determined by linear polarization resistance measurement (LPR). The model was also verified against experimental results recently obtained by the authors.

KW - Arch strength mechanism

KW - Bond

KW - Building and Construction

KW - Civil and Structural Engineering

KW - Corrosion

KW - Pitting

KW - R.C. floor

KW - T beam

UR - http://hdl.handle.net/10447/176197

UR - http://www.journals.elsevier.com/case-studies-in-structural-engineering/

M3 - Article

VL - 4

SP - 26

EP - 38

JO - Case Studies in Structural Engineering

JF - Case Studies in Structural Engineering

SN - 2214-3998

ER -