Corrosion effects on the seismic response of existing rc frames designed according to different building codes

Bertó, Luisa; Caprili, Silvia; Saetta, Anna; Salvatore, Walter; Talledo, Diego

doi:10.1016/j.engstruct.2020.110397

Cited by 22 publications

(9 citation statements)

References 40 publications

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“…The mean compressive strength of concrete, assumed as C25 class for existing structure and C30 class for RCframed skin, was evaluated according to Model Code 2010 [29]. The mean yield strength, hardening ratio, and ultimate strain of the existing structure's steel were selected by means of STIL software [30,31], where the probability distributions for those quantities are given based on an extensive database of experimental tests on reinforcing bars collected from samples of the second half of the last century, while the same properties for RC-framed skin's steel (assumed as a reinforcing steel of class B450C) was taken from available experimental results [32]. A Kent-Scott-Park constitutive model [33,34] with no tensile strength was selected for concrete, while an elastic-plastic law with strain hardening was selected for reinforcement.…”

Section: Seismic Simulationmentioning

confidence: 99%

Multidisciplinary Performance Assessment of an Eco-Sustainable RC-Framed Skin for the Integrated Upgrading of Existing Buildings

et al. 2021

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Recent earthquakes have highlighted a general inadequacy of the existing building stock in Italy and the need to address this critical issue by increasing its structural resilience. At the same time, the problem of energy consumption in existing residential and commercial buildings is increasingly significant and incompatible with the environmental targets set by governments. Considering all the aforementioned aspects, the seismic upgrading of existing buildings, based on the use of an eco-friendly and sustainable technology, has become more and more relevant and different intervention approaches have been developed. This paper aims to provide a multidisciplinary approach for the performance assessment of an eco-friendly and sustainable RC-framed skin for integrated refurbishment of existing buildings. A preliminary description of such skin technology is provided with particular attention to the simultaneous improvement of structural (e.g., seismic) and non-structural (e.g., energy, acoustic) performances and to issues concerning the limitation of invasiveness and interruption of use of the building. Technological details and in situ installation phases are described with special regard to connection and interaction with the existing building. Procedures for the assessment of upgraded building performances, in terms of seismic capacity and thermo-hygrometric and acoustic performances, are defined and applied to a selected basic cell structure. The feasibility and sustainability of the proposed upgrading intervention is finally investigated by means of a holistic Life Cycle Assessment for environmental impact and Life Cycle Cost for an economic evaluation. Finally, results from a multidisciplinary performance assessment are critically discussed by relating the performance aspects to the technological and installation issues.

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Section: Seismic Simulationmentioning

confidence: 99%

Multidisciplinary Performance Assessment of an Eco-Sustainable RC-Framed Skin for the Integrated Upgrading of Existing Buildings

et al. 2021

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“…The attainment of ductile and brittle failures in the first elements, according to Equations ( 2) and ( 3), is marked in the capacity curves using for chord rotation capacity a yellow circle and for shear capacity a green triangle. Moreover, the type of elements where the limit is reached is highlighted by the letter C for column and B for beam (see also [23]).…”

Section: Structural Capacity Assessmentmentioning

confidence: 99%

Numerical Assessment of an Innovative RC-Framed Skin for Seismic Retrofit Intervention on Existing Buildings

et al. 2021

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The seismic safety of existing building stock has become a very critical issue in recent years, mainly in earthquake-prone South Europe where most of the buildings were designed before the enforcement of seismic standards. Therefore, the concept, development and testing of efficient and cost-effective seismic retrofitting technologies are nowadays strongly needed, both for the society and for the scientific community. This study deals with the seismic assessment of a new RC-framed skin for retrofit intervention of existing buildings, evaluated through nonlinear static (pushover) analyses. A preliminary description of the proposed technology is provided, then numerical modeling of a typical RC existing building before and after retrofitting intervention is performed within the OpenSees framework. The results revealed that the proposed retrofitting technology improves the seismic performance of the RC building, also modifying the failure mode from a brittle soft-story mechanism to a more ductile one. The presented study, dedicated to the structural aspects of the system, is part of the TIMESAFE research project, where the thermo-hygrometric and acoustic performances achievable by the proposed RC-framed skin are also investigated.

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“…Consequently, the whole structure under seismic actions may have a performance worse than the estimated one. Nowadays, the assessment of corroded RC structures is mainly modeled by considering the steel and (eventually) the concrete deterioration [18][19][20][21]. Rarely, the bond-slip law as well as the buckling effects are considered [22,23].…”

Section: Introductionmentioning

confidence: 99%

Modelling Strategies for Reinforced Concrete Elements under Corrosion Degradation

Imperatore

2022

Materials

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Aging and corrosion of reinforced concrete structures (RCS) is becoming a global problem, thus proper procedures for simulating the structural performance of corroded RCS should be assessed. Among the main corrosion effects, concrete cover cracking and reinforcement cross-section reduction may influence the materials’ constitutive laws, moreover the confinement contribution and the lateral instability of the longitudinal rebars can be modified. In the present paper, the predictive models available in the scientific literature to assess the materials’ mechanical properties of corroded RCS are recalled and employed into a novel model to derive the theoretical moment–curvature relationships for the cross-section of square and rectangular corroded reinforced concrete elements. The model accounts for cover spalling, buckling of longitudinal reinforcing bars, reduction in confinement pressures, reduction in concrete constitutive law due to the concrete cracking induced by rust formation and decay of mechanical properties for corroded reinforcements. The obtained results are compared with the classical simplified models for corroded RCS, highlighting that buckling and confinement variations cannot be disregarded into a reliable modelling strategy, especially when local ductility plays a key role in the performed investigations.

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Corrosion effects on the seismic response of existing rc frames designed according to different building codes

Cited by 22 publications

References 40 publications

Multidisciplinary Performance Assessment of an Eco-Sustainable RC-Framed Skin for the Integrated Upgrading of Existing Buildings

Multidisciplinary Performance Assessment of an Eco-Sustainable RC-Framed Skin for the Integrated Upgrading of Existing Buildings

Numerical Assessment of an Innovative RC-Framed Skin for Seismic Retrofit Intervention on Existing Buildings

Modelling Strategies for Reinforced Concrete Elements under Corrosion Degradation

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