Experimentelle Untersuchung von Lärmschutzwandstehern und deren Befestigung auf Kunstbauten

Reiterer, Michael; Stranghöner, Natalie; Jungbluth, Dominik

doi:10.1002/stab.201900101

Cited by 4 publications

(9 citation statements)

References 3 publications

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“…This type of fastening is used, for example, in the installation of noise barrier posts on bridge edge beams. 6,7 Figure 2B shows a detail of the head cap and Figure 2c shows the application of the smart mechanical connection component with pressure indicator for a typical connection of two sheets in steel construction.…”

Section: Intelligent Mechanical Connection Component With Pressure mentioning

confidence: 99%

“…Fatigue fractures may occur in the threaded bolts if the preload is reduced over the service life. 6,7 This is a critical condition for the noise barrier system on railway lines; therefore, it is very important to test and monitor the current preload in the fasteners. By using a measuring system, preload losses can be detected and measures to restore the correct preloaded condition can be instructed and executed.…”

Section: Smart Electronic Measuring Screw Nutmentioning

confidence: 99%

“…The railway bridge shown in Figure 8 A separate procedure test was carried out on the calibrated tightening test rig for mechanical fasteners at the Institute for Metal and Lightweight Construction at the University of Duisburg-Essen to ensure monitored preloading and to define a handling instruction for the bolted stainless steel connection. 6 Due to the fact that the use of stainless steel bolt and nut assemblies is currently limited to nonpreloaded connections by ÖNORM EN 1090-2 2 , 23,24 this was a necessary step. The procedure test has shown that the desired target value of the preloading force of F p,req,M16 ≥ 60 kN can be reliably reached by applying a tightening torque of 250 Nm.…”

Section: Description Of the Selected Railway Bridge And Installed Mmentioning

confidence: 99%

“…It should, however, be noted at this point that a separate procedure qualification must be carried out for bolt and nut assemblies that do not comply with ÖNORM EN 14399, and for all stainless steel fittings. 6 This means that the tightening torques for mechanical fasteners cannot simply be estimated or determined.…”

Section: Introductionmentioning

confidence: 99%

“…Under dynamic load, these results in significantly lower fatigue-related stress ranges compared to non-preloaded connections. [6][7][8][9] The external loading is not transmitted through the cross-section of the bolt alone, but through the entire compression-tensioned area of the connected components.…”

Section: Introductionmentioning

confidence: 99%

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Innovative methods to test and monitor the preload in mechanical fasteners

Reiterer

2021

Civil Engineering Design

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The paper presents currently applied methods to test and monitor the preload level in mechanical fasteners and evaluates them with respect to the quality of the gained measuring results. Both, visual inspection methods and electronic state-of-the-art measurement techniques are presented. This contribution introduces recently developed and patented innovative methods to test and monitor the preload level in mechanical fasteners. The methods developed include a smart mechanical fastener with pressure indicator and a smart electronic measuring screw nut. The smart mechanical fastener has no electronic features and is able to display the loss of preload through a red dot that occurs on the upper end of the fastener. The smart measuring screw nut is an electronic fastening element, that records the current value of preload in a time-discrete or permanent manner. In order to investigate the suitability for daily use and long-term stability of the novel methods to test and monitor the preload in mechanical fasteners, laboratory experiments and in-situ tests were executed. The gained results are presented and discussed.

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Section: Intelligent Mechanical Connection Component With Pressure mentioning

confidence: 99%

Section: Smart Electronic Measuring Screw Nutmentioning

confidence: 99%

Section: Description Of the Selected Railway Bridge And Installed Mmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Innovative methods to test and monitor the preload in mechanical fasteners

Reiterer

2021

Civil Engineering Design

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Ansätze zur performancebasierten Zustandsbeurteilung und Lebensdauerprognose von Ingenieurkonstruktionen

Reiterer

Strauß²,

Kari³

2020

Beton und Stahlbetonbau

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Es werden neue innovative Ansätze zur performancebasierten Zustandsbeurteilung und Lebensdauerprognose von Ingenieurkonstruktionen auf Grundlage eines hybriden und modellbasierten Zuverlässigkeitsindex vorgestellt. Die Methode beruht auf der Zusammenführung der Ergebnisse aus rein visuellen Zustandsprüfungen von Ingenieurkonstruktionen mit vorhandenem Expertenwissen aus Versuchen und Berechnungen. Mittels Methoden der Künstlichen Intelligenz (KI) werden die Zustandsklassen aus der heuristischen visuellen Inspektion und das vorhandene Expertenwissen zur verfeinerten Ermittlung des zustandsabhängigen Zuverlässigkeitsindex unter Berücksichtigung der entsprechenden Schadensfolgeklassen (CCn) bei einem bestimmten Lebensalter der Konstruktion herangezogen. Es werden vier unterschiedliche Modelle für die Prognose der zukünftig sich ergebenden Zustandsentwicklung/Degradation und der zu erwartenden Lebensdauer der betrachteten Ingenieurkonstruktion vorgestellt. Diese methodischen Ansätze werden am Beispiel einer bei Zugvorbeifahrt hochgradig dynamisch beanspruchten Lärmschutzwandkonstruktion der Bahn zur Zustandsbeurteilung und Lebensdauerprognose skizziert.

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Life‐cycle performance of noise barriers focusing on installation conditions of fasteners

Granzner,

Strauss,

Reiterer

et al. 2023

ce papers

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This concept paper discusses the effects of the installation condition of fasteners on the life‐cycle performance of noise barriers. Noise barriers that are erected along high‐speed railway lines are loaded by aerodynamic pressure and suction waves due to the passing trains. As an integral part of railway infrastructures their level of safety must be maintained throughout their entire lifetime. On basis of this concept and study, a potential monitoring‐based approach for the assessment of the life‐cycle performance of NBs is briefly introduced. That monitoring‐based approach finds its place in a holistic four‐stage assessment framework, in other words a progressive four‐stage model in which the information content increases with each model stage and thus successively increases the accuracy of the determined structural conditions at the time of observation and the prediction for the remaining service life of the structure. The objectives of this paper should bring relevant insights for the whole holistic four‐stage model. Depending on how far the degradation of the considered noise barrier has already progressed, the corresponding stage of the holistic assessment concept is activated, which enable infrastructure managers to plan their future investments regarding maintenance, retrofit or rebuilt of noise barriers more economically.

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Experimentelle Untersuchung von Lärmschutzwandstehern und deren Befestigung auf Kunstbauten

Cited by 4 publications

References 3 publications

Innovative methods to test and monitor the preload in mechanical fasteners

Innovative methods to test and monitor the preload in mechanical fasteners

Ansätze zur performancebasierten Zustandsbeurteilung und Lebensdauerprognose von Ingenieurkonstruktionen

Life‐cycle performance of noise barriers focusing on installation conditions of fasteners

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