Fatigue-Prone Details in Steel Bridges

Haghani, Reza; Al‐Emrani, Mohammad; Heshmati, Mohsen

doi:10.3390/buildings2040456

Cited by 119 publications

(70 citation statements)

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“…The most common deficiencies reported in the literature for this type of bridge are development of fatigue cracks at clip-angle, connections between the stringers, and floor beams. [74] Development of fatigue cracks in stringer to floor beam clip angles was simulated by reducing connection rotational stiffness. It was assumed that the moment-rotation relationship at the connection was linear for both healthy and damaged cases, with a healthy connection featuring a rotational stiffness equal to 67% of a continuous stringer span.…”

Section: Appendix Bridge Descriptionmentioning

confidence: 99%

Damage detection in structural systems utilizing artificial neural networks and proper orthogonal decomposition

Azam

Rageh

Linzell

2018

Struct Control Health Monit

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Summary A supervised learning scheme is proposed for detecting, locating, and quantifying the intensity of damage in structures using Artificial Neural Networks (ANNs) and Proper Orthogonal Decomposition (POD). For structural systems, such as buildings and bridges, Proper Orthogonal Modes (POMs) associated with their response are functions of (1) applied external loads and (2) mechanistic properties. In the present research, a supervised learning strategy was adopted to help discriminate POM variations because of damage from damage caused by applied load variations. A neural classifier was trained to categorize response to different load patterns, and a regression ANN was subsequently trained using an ensemble of applied loads to detect possible damage from the categorized POMs. To demonstrate the effectiveness of the proposed approach, simulated experiments were performed with the intent of identifying damage indices for a railway truss bridge. A validated, three‐dimensional (3D) finite element (FE) model of an existing bridge was used to generate strain time histories under train loads measured from weigh‐in‐motion (WIM) stations near the bridge. The efficacy of the proposed method was demonstrated through these simulated experiments.

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Section: Appendix Bridge Descriptionmentioning

confidence: 99%

Damage detection in structural systems utilizing artificial neural networks and proper orthogonal decomposition

Azam

Rageh

Linzell

2018

Struct Control Health Monit

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“…Most se sastoji od kontinuiranih zavarenih čeličnih nosača preko tri raspona (32,20 m + 38,42 m + 32,02 m). Budući da je kraj dodatne lamele jedan od kritičnih detalja sa stajališta umora [11], provedena su brojna ispitivanja ovoga detalja [12,13]. Takav se detalj prema EC3 može svrstati u kategoriju 56 u slučaju pristupa preko nominalnih naprezanja, odnosno u kategoriju 100 za pristup preko hot spot pristupa [4].…”

Section: Opis Analiziranog Detaljaunclassified

Fatigue life assessment by using local Hot Spot approach

Fuštar¹,

Lukačević²,

Dujmović³

2017

Zajednički Temelji 2017 - Peti Skup Mladih Istraživača Iz Područja Građevinarstva I Srodnih Tehničkih Znanosti - Zbornik Radova

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SažetakPrilikom procjene preostaloga životnog vijeka čeličnih detalja izloženih umoru najčešće se zbog jednostavnosti proračuna primjenjuje S-N metoda uz globalni pristup preko nominalnih naprezanja. Ta metoda na strani djelovanja zanemaruje lokalne utjecaje poput koncentracija naprezanja uzrokovanih lokalnom promjenom u geometriji detalja. Ovi se utjecaji indirektno uzimaju na strani otpornosti pomoću eksperimentalno dobivenih S-N krivulja. Ako se radi o geometrijski složenijemu detalju ili je detalj opterećen složenim stanjem naprezanja, primjenjuju se lokalni pristupi kojima se prilikom proračuna uzimaju u obzir lokalni utjecaji. Ovaj rad prikazuje procjenu životnoga vijeka zavarenoga čeličnog detalja dodatne lamele izloženog umoru. Detalj je sastavni dio čelične konstrukcije željezničkoga mosta, a procjena se provodi lokalnim pristupom preko hot spot naprezanja. Naprezanja se određuju mjerenjem deformacija na određe-nim mjestima u detalju zbog prolaza karakterističnih vlakova. Karakteristični vlakovi sastavni su dio modela opterećenja formiranoga prema podacima Hrvatskih željeznica. Na taj se način proračunava životni vijek zavarenoga detalja zbog umora, a rezultati se uspoređuju sa životnim vijekom istoga detalja dobivenog pristupom preko nominalnih naprezanja. Ključne riječi: životni vijek zbog umora, lokalni pristup Hot Spot naprezanja, zavareni detalj Fatigue life assessment by using local Hot Spot approach AbstractDuring the assessment of remaining fatigue life of the welded details that are prone to fatigue, S-N method with global nominal stress approach is the most common method due to its simplicity. This method neglects local action effects such as stress concentrations due to local geometry changes in detail. These effects are indirectly included on the resistance side trough experimentally obtained S-N curves. In cases of more complex detail or if the detail is loaded with a complex stress state, local approaches which take local effects into account during calculations are used. This paper presents a fatigue life assessment of fatigue prone cover plate welded steel detail. Detail is a part of the steel railway bridge structure and assessment is made by local hot spot stress approach. Stresses are determined based on strain measurements on specific locations in the detail, due to the passage of characteristic trains. Characteristic trains are an integral part of a load model formed by data from Croatian Railways. Accordingly, the fatigue life of the welded detail is calculated and the results are compared with fatigue life of the same detail which is determined based on the nominal stress approach.

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“…Cover plate width is 400 mm and thickness 15 mm. Considering that the end of a cover plate is one of the fatigue critical details [17], a number of experiments have been conducted [18,19]. Review of the design procedure of cover plate and shaping details are given in [20].…”

Section: Analysed Detailmentioning

confidence: 99%

Fatigue Life Assessment of Welded Cover Plate by Using Global and Local Approaches

Lukačević

Fuštar²,

Dujmović

2017

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This paper presents the fatigue life assessment of a welded detail in an existing steel railway bridge. The fatigue life is assessed based on strain measurements due to the passage of characteristic trains. Characteristic trains are an integral part of the load model formed by "Croatian railways" data. Strain gauges that measure deformations are set at specific locations in order to gain information on Nominal and Hot Spot stresses. Based on this measurement data, stress ranges and stress spectrum are determined and compared to a corresponding detail category. Obtained results in this paper are related to comparing fatigue life of the analysed detail based on local and global approaches according to Eurocode 3 and IIW recommendations.

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Fatigue-Prone Details in Steel Bridges

Cited by 119 publications

References 5 publications

Damage detection in structural systems utilizing artificial neural networks and proper orthogonal decomposition

Damage detection in structural systems utilizing artificial neural networks and proper orthogonal decomposition

Fatigue life assessment by using local Hot Spot approach

Fatigue Life Assessment of Welded Cover Plate by Using Global and Local Approaches

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