Aldo Milone’s research while affiliated with University of Naples Federico II and other places

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Publications (26)


Post-necking and damage modelling of steel structural components: A comprehensive state of the art
  • Article

December 2024

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19 Reads

Engineering Structures

Aldo Milone

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Filippo Berto

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Figure 2. Key features of the most critical connections: (a) LC-midspan and (b) TD-most stressed.
Figure 3. Main features of FE models: (a) global FEM of the bridge, (b,c) local FEMs of critical details.
Main features of "real" train loads and relevant daily passages according to RFI indications.
Application of the rainflow method to derive stress histories for critical details.
SED-based fatigue demand on investigated critical details.
Advanced Fatigue Assessment of Riveted Railway Bridges on Existing Masonry Abutments: An Italian Case Study
  • Article
  • Full-text available

July 2024

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102 Reads

Buildings

Riveted railway bridges with already long structural lives can still be commonly found in service in Europe. In light of their peculiarities, they are often prone to fatigue damage; nevertheless, very few prescriptions regarding fatigue assessment of these structures can be found in current European provisions. Within this framework, the present paper illustrates the advanced fatigue assessment of an Italian riveted railway bridge selected as a case study. For this purpose, multi-scale finite element modelling of the bridge was developed, and the most critical details were assessed through application of the advanced strain energy density (SED) method. The obtained outcomes were compared both with other studies in the literature and prescriptions from the current and upcoming versions of EN1993-1-9.

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Code-conforming fatigue life assessment of riveted lap shear joints

January 2024

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12 Reads

Procedia Structural Integrity

Recent studies highlighted the importance of an accurate assessment of the remaining life of historical steel riveted bridges to plan and design their maintenance. Such structures are usually prone to fatigue damage due to the high number of cumulated cyclic stresses over their service life. Currently, limited guidelines are available for evaluating the fatigue strength of riveted connections. According to the JRC-ECCS document Assessment of Existing Steel Structures: Recommendations for Estimation of Remaining Fatigue Life, the fatigue capacity of riveted connections should be evaluated through the fatigue class 71, whose prediction may be excessively conservative. Therefore, this paper summarizes the results of a theoretical study and an experimental campaign aimed at characterizing the high-cycle fatigue of riveted shear splices. Experimental fatigue results have been collected from the literature, and a database has been built, including material property, loading condition, riveting process, and geometry information. The collected data and those obtained from the performed tests have been statistically elaborated to investigate the influence of such parameters on their fatigue strength. Finally, comparisons with the recommended fatigue classes are provided to discuss their suitability in predicting the fatigue strength of the investigated riveted connections.



Fatigue strength assessment of riveted shear splices

September 2023

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70 Reads

ce/papers

Old‐steel riveted bridges are part of the heritage asset in many countries. Assessing the remaining life and fatigue strength of their structural riveted details is crucial in managing these structures. According to JRC‐ECCS document Assessment of Existing Steel Structures: Recommendations for Estimation of Remaining Fatigue Life , fatigue class 71 is recommended to estimate the fatigue strength of riveted details. However, the predicted fatigue behaviour can lead to excessively conservative estimates. Hence the research community is still focusing on the suitability of current recommendations. This work performs a numerical study to evaluate the fatigue strength of riveted double‐shear splices. Experimental fatigue test results are collected from the literature, and some are used to develop a finite element model in ABAQUS and Fe‐Safe. The adopted modelling fatigue approach is applied to investigate the fatigue behaviour of double‐shear riveted connections with different geometrical properties. The numerical results are compared with all collected data, showing the procedure's effectiveness in predicting the fatigue strength of double‐shear riveted splices. Finally, the numerical and experimental results are compared with the recommended S‐N curves.


Citations (10)


... Studies demonstrated the potential of steel exoskeletons to improve the seismic performance of RC buildings while also meeting structural, thermal and architectural requirements [11]. RC structures retrofitted with steel exoskeletons, at times in combination with local interventions, showed significant improvements in the global structural behavior, while also reducing the number of RC elements affected by brittle failure [12,13]. Cold-formed lightweight steel systems offer an effective structural solution, as they combine the advantages of lightweight construction with strong performance during seismic events. ...

Reference:

Seismic Design and Analysis of a Cold-Formed Steel Exoskeleton for the Retrofit of an RC Multi-Story Residential Building
Seismic Upgrade of a Non-Code Compliant Multi-Storey Steel Building: A Case Study
  • Citing Article
  • July 2024

Journal of Building Engineering

... Bolt connections are extensively utilized in bridges, large industrial facilities, and prefabricated concrete frame structures within civil engineering due to their structural stability, adaptability, and ease of construction [1][2][3][4]. When subjected to vibrational loads, fatigue failure and loosening can occur in bolt structures, with fatigue failure often emanating from localized loosening [5]. ...

Influence of hot-dip galvanization on the fatigue performance of high-strength bolted connections
  • Citing Article
  • January 2024

Engineering Structures

... The first methodology, shown in Fig. 15a, has been proposed by Milone et al [95], and consists in evaluating the averaged SED curve vs the number of cycles for different values of the stress ratio R; the calibrated value of the control volume radius R 0 is the one that minimize the scatter index of the fatigue curve in terms of SED, T ΔW . The fatigue dataset collected in the present paper resulted in a control volume radius of R 0 = 2.32 mm considering the fatigue data having failure between 10 4 and 2x10 6 cycles. ...

Evaluation of the influence of mean stress on the fatigue behavior of notched and smooth medium carbon steel components through an energetic local approach
  • Citing Article
  • September 2023

Fatigue & Fracture of Engineering Materials & Structures

... This condition-in conjunction with (i) structural shortages deriving from the lack of adequate provisions at the time of erection, (ii) peculiar constructional imperfections deriving from the hot-driving process (HDP), and (iii) the diffuse increase of traffic loads in recent times-leaves riveted details exposed to severe fatigue damage. This further proves to be a critical issue if one considers the limited redundancy of truss bridge structures [9][10][11][12]. ...

Influence of camming imperfections on the resistance of lap shear riveted connections
  • Citing Article
  • April 2023

Journal of Constructional Steel Research

... The findings of nonlinear static analyses on irregular multi-story RC buildings were deemed appropriate [10]. Previous studies [44][45][46][47] have developed a 3D pushover approach for investigating non-regular building structures. So, it can be concluded that nonlinear static pushover analysis (POA) yields satisfactory results when applied to the analysis of irregular buildings. ...

Seismic Assessment and Strengthening of an Existing Industrial Building

... Local failures pertaining to chord-to-column connections or diagonal connections were not within the scope of this study. The influence of these local components on comprehensive seismic assessments was already discussed by the authors in a prior publication [30]. Figure 7 illustrates the pushover curves derived for the six industrial buildings investigated in the longitudinal direction, accompanied by the capacity point, as defined by the aforementioned performance criteria. ...

Seismic Retrofitting of Existing Industrial Steel Buildings: A Case-Study

Materials

... Corrosion stands out as a primary structural degradation process that significantly impacts structural integrity, a reduction in the effective cross-sectional area, moment of inertia, torsional and warping constants [48,49]. The interaction between corrosion and cyclic loading, commonly recognised as corrosion fatigue, affects the mechanical properties of steel, resulting in the initiation of cracks from the corrosion-induced surface and a substantial decrease in fatigue strength [50][51][52][53]. This degradation is evident in a typical S-N curve of a material exposed to an air environment influenced by the corrosion process, as depicted in Fig. 1. ...

A Simplified Approach for the Corrosion Fatigue Assessment of Steel Structures in Aggressive Environments

Materials

... For instance, the fatigue problem of stay cables was analyzed for in-service cable-stayed bridges under combined actions of traffic and wind [14], employing the bilinear S-N curve for bridge cables provided by Eurocode 3 [15]. Furthermore, considering the susceptibility of bridge cables to corrosion damage in harsh environments, many researchers [16][17][18] estimated the fatigue life of intact and corroded bridge cables with different section forms using S-N curves and Miner cumulative damage criterion. However, these studies primarily revolved around the fatigue life assessment problem only for bridge cables under axial cyclic loading. ...

Methodologies for the fatigue assessment of corroded wire ropes: A state-of-the-art review
  • Citing Article
  • March 2022

Structures

... When designing the reinforced concrete column steel beam frame, refer to the standards listed in the relevant codes GB50010-2010 and GB50011-2010 [14] and design the reinforced concrete column steel beam frame model for experimental analysis. The height of each floor of the model is designed as 1.5 m, and the number of spans is designed as 3 × 2. Compared with the actual building, the model is reduced by 1/3. ...

Retrofit of non-code conforming moment resisting beam-to-column joints: A case study
  • Citing Article
  • February 2022

Journal of Constructional Steel Research

... Indeed, as stated in Section 2, the same deep profile is adopted for main beams at each storey (i.e., IPN 320), while columns become thinner along the height of the building. It is worth reporting that this result complies with outcomes previously derived by the Authors [9,10], which investigated the local response of non-conforming MR joints extracted from the case study by means of refined local FE analyses. Indeed, as reported in [9], asbuilt MR joints collapsed due to premature failure of connections on the columns' side at each floor, while beams always behaved elastically up to failure. ...

SEISMIC ASSESSMENT OF BEAM-TO-COLUMN JOINTS FOR A NON-CONFORMING MRF EXISTING STRUCTURE