A corrosion model for the interpretation of cyclic behavior of reinforced concrete sections

Lavorato, Davide; Fiorentino, Gabriele; Pelle, Angelo; Rasulo, Alessandro; Bergami, Alessandro Vittorio; Briseghella, Bruno; Nuti, Camillo

doi:10.1002/suco.201900232

Cited by 38 publications

(22 citation statements)

References 20 publications

(62 reference statements)

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“…The Bridges were modeled by using the finite element (FE) software SAP2000 NL, v. 21 [43]; the 3D numerical models are shown in Figure 9a,b,c and were modeled according to the structural scheme already used in previous studies [44].…”

Section: Numerical Modelsmentioning

confidence: 99%

“…In order to validate the generalization of IMPAβ for bridges, statistical analyses of results based on responses obtained by using the single response spectra of the accelerograms used for IDA, the effects of the variation of the seismic input with intensity, the asynchronous seismic motion [42,43], near fault seismic input and all the different bridge configurations (i.e., deck shape and sections, constraints, bridge piers and bridge length) are in progress.…”

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confidence: 99%

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IMPAβ: Incremental Modal Pushover Analysis for Bridges

Bergami

Nuti²,

Lavorato

et al. 2020

Applied Sciences

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In the present study, the incremental modal pushover analysis (IMPA), a pushover-based approach already proposed and applied to buildings by the same authors, was revised and proposed for bridges (IMPAβ). Pushover analysis considers the effects of higher modes on the structural response. Bridges are structurally very different from multi-story buildings, where multimodal pushover (MPA) has been developed and is currently used. In bridges, consideration for higher modes is often necessary: The responses of some structural elements of the bridge (e.g., piers) influence the overall bridge response. Therefore, the failure of these elements can determine the failure of the whole structure, even if they give a small contribution total base shear. Incremental dynamic analysis (IDA) requires input accelerograms for high intensities, which are rare in the databases, while scaling of generated accelerograms with a simple increment of the scaling acceleration is not appropriate. This fact renders IDA, which is by its nature time-consuming, not straightforward. On the contrary, the change of input spectrum required by IMPA is simple. IMPAβ also utilizes a simple complementary method coupled to MPA, to obtain bounds at very high seismic intensities. Finally, the two incremental methods based on static nonlinear and dynamic nonlinear analyses are compared.

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Section: Numerical Modelsmentioning

confidence: 99%

mentioning

confidence: 99%

IMPAβ: Incremental Modal Pushover Analysis for Bridges

Bergami

Nuti²,

Lavorato

et al. 2020

Applied Sciences

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“…Therefore, the resulting structures where conceived to respond in the elastic range, leaving a false sense of security that the actual resistances (well beyond the nominal ones considered in the design process) would be assured by the adopted safety coefficients and by the inelastic behavior of materials and structures. On the contrary, the lack of a hierarchy of strengths that would be lately assured by the implementation, in modern codes, of capacity design principles, would not prevent the occurrence of non-ductile failure modes reducing the extent of the inelastic response [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of Reinforced Concrete Bridge Piers Including a Flexure-Shear Interaction Model

et al. 2020

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This paper discusses the seismic behavior of reinforced concrete (RC) bridge structures, focusing on the shear–flexure interaction phenomena. The assessment of reinforced concrete bridges under seismic action needs the ability to model the effective non-linear response in order to identify the relevant failure modes of the structure. Existing RC bridges have been conceived according to old engineering practices and codes, lacking the implementation of capacity design principles, and therefore can exhibit premature shear failures with a reduction of available strength and ductility. In particular, recent studies have shown that the shear strength can decrease with the increase of flexural damage after the development of plastic hinges and, in some cases, this can cause unexpected shear failures in the plastic branch with a consequent reduction of ductility. The aim of the research is to implement those phenomena in a finite-element analysis. The proposed model consists of a flexure fiber element coupled with a shear and a rotational slip spring. The model has been implemented in the OpenSEES framework and calibrated against experimental data, showing a good ability to capture the overall response.

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“…Furthermore, a simplified hysteretic model is used to simulate the performance of corroded RC frame structures. Some mechanisms, such as post-yielding buckling [62], can also affect the performance deterioration of RC frame structures, which require further investigation in future studies.…”

Section: ) Proportion Of Corroded Components (Pcc)mentioning

confidence: 99%

Regional Seismic Damage Simulation of Corroded RC Frame Structures: A Case Study of Shenzhen City

et al. 2020

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Buildings in coastal cities are susceptible to chloride ion attack and the seismic performance of these buildings can be impaired due to corrosion of reinforcements. In this study, a regional seismic damage simulation method that considers the influence of corrosion-induced seismic performance degradation is proposed. Firstly, the framework of the method is introduced, and the simulation process is presented. Secondly, experimental data of corroded reinforced concrete (RC) components are collected to obtain the reduction rules of component level backbone curve parameters (i.e., initial stiffness, peak carrying capacity, peak displacement, and ultimate carrying capacity). Afterwards, pushover analyses of typical RC frames in different corrosion conditions (i.e., degree of corrosion of components and proportion of corroded components) are conducted to acquire the reduction rules of interstory backbone curve parameters of corroded RC frame structures. Finally, RC frame structures, in Shenzhen city, are simulated using different corrosion scenarios. Simulated results indicate that some buildings along the coastline are affected by airborne chloride-induced corrosion and severe seismic damage can be observed. Moreover, some buildings that are far from the coastline can also experience severe seismic damage due to irregular use of sea sand as constructional material. The proposed method can be used to simulate the seismic performance of corroded RC structures and the outcomes of this study are expected to provide a useful reference for the seismic risk management of coastal cities.

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A corrosion model for the interpretation of cyclic behavior of reinforced concrete sections

Cited by 38 publications

References 20 publications

IMPAβ: Incremental Modal Pushover Analysis for Bridges

IMPAβ: Incremental Modal Pushover Analysis for Bridges

Finite Element Analysis of Reinforced Concrete Bridge Piers Including a Flexure-Shear Interaction Model

Regional Seismic Damage Simulation of Corroded RC Frame Structures: A Case Study of Shenzhen City

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