Axial Fatigue of Multilayered Strands

Large scale fatigue tests of strands on saddle systems for cable-stayed bridges Stay cables made of parallel strands for cable-stayed or extradosed bridges are usually anchored in the pylon or the mast of the bridge. New saddle systems provide the opportunity to support them by saddles that guide the strands continuously from one side of the pylon to the other. While cables made of strands have been tested for fatigue extensively, saddle systems were not yet tested much although the fatigue mechanism occurring inside a saddle is particularly complex. The need to perform such a test and the facilities that exist at the Berlin Institute of Technology (TU Berlin), Department of Civil and Structural Engineering provided the unique opportunity to perform large scale fatigue test on cable saddle systems with 55 and with 37 strands. These tests were performed in accordance to fib recommendations, bulletin 30, January 2005. This paper describes the saddle systems used today as well as the test rig and tests conducted in Berlin.

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“…Das Ermüdungsverhalten von Brückenseilen und Litzen unter Axialbelastung ist ausführlich untersucht worden [7,8,9].…”

Section: Prüfmethodenunclassified

Großversuche zur Ermüdung von Litzenseilen auf Umlenksätteln für Schrägseilbrücken

Schlaich

Abdalsamad

Annan³

2012

Bautechnik

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“…Raoof and Hobbs proposed the use of a friction coefficient of 0.12, based on experimental investigations of wire to wire friction for galvanized and lubricated wires. This friction coefficient was adopted by Raoof for modelling friction between cable wires. In this paper, general contact with a “penalty algorithm” was used to model wire to wire and cable to sheave contacts.…”

Section: Developing a Finite Element Model For Cables Bent Over Sheavesmentioning

confidence: 99%

“…Wang et al investigated the effect of acceleration and deceleration, effective payload and maximum speed on the dynamic friction, and creep properties between a rope and friction lining during coal mine hoisting. Previous research by a number of authors ( and others) focused on understanding the stress‐strain behaviour of such cables, but much is yet not fully understood especially the impact of groove size or sheave size on fatigue life. Also, there is a scarcity of information on methods that may be used to predict fretting fatigue of cables.…”

Section: Introductionmentioning

confidence: 99%

“…Feyrer proposed regression coefficients to estimate the fatigue life of cables bent over sheaves based on experimental data, but the cables investigated were not exhaustive. Raoof and Hobbs and Raoof previously used a stress‐based approach to identify the fatigue life of strands subjected to cyclic tension. Knapp also used a similar stress‐based approach to identify the fatigue life of a 19‐wire strand bent over a sheave.…”

Section: Introductionmentioning

confidence: 99%

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Fatigue prediction for hoist cables over sheaves in large mining shovel application

Wokem

Joseph

Curley

2018

Fatigue Fract Eng Mat Struct

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Cables are used in many engineering applications, whether considered as stationary or running cables. In the latter, ropes are subjected to repeated tension and bending as they run over a sheave wheel. Such loading scenarios are seen for large mining equipment such as draglines and shovel hoist ropes. Fretting fatigue failure often occurs after several cycles of loading because of wires rubbing against each other and external wires rubbing against sheave wheels. It is also pertinent to understand the behaviour of cables subjected to bending over sheaves, to be able to predict fretting fatigue life, so as to set preventive maintenance activities to avoid catastrophic failure in such systems. In this paper, the behaviour of 2 specific configuration strands, composing either 7 or 19 wires, bent over a sheave is investigated numerically. To aid preventive maintenance inspection, critical locations of stress concentrations are identified as a function of applied load or tensile stress. The investigation also considers the impact of groove size, diameter of sheave to diameter of cable ratio, and contact length, enabling the application to infer fatigue life.

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“…A theory of contact was developed predicting the shape of the contact area and the growth in size with increasing load; the magnitude and distribution of surface tractions, normal and possibly tangential forces, transmitted across the interface. Raoof [5] developed from first principles a theoretical model using axial single wire data for predicting the axial fatigue of the full cross-section at constant load amplitude, and was able to correlate the theoretical predictions to observations from experimental testing. Raoof [6] concluded that his theoretical model provides useful upper bounds to the fatigue life of cables failing at the end termination and that the termination type significantly affects the observed fatigue life.…”

Section: Introductionmentioning

confidence: 99%

Experimental and finite element analysis of fatigue performance of copper power conductors

Nasution

Sævik

Gjøsteen

et al. 2013

International Journal of Fatigue

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Axial Fatigue of Multilayered Strands

Cited by 39 publications

References 8 publications

Großversuche zur Ermüdung von Litzenseilen auf Umlenksätteln für Schrägseilbrücken

Großversuche zur Ermüdung von Litzenseilen auf Umlenksätteln für Schrägseilbrücken

Fatigue prediction for hoist cables over sheaves in large mining shovel application

Experimental and finite element analysis of fatigue performance of copper power conductors

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