X-ray measure of tensile force in post-tensioned steel cables

Morelli, Francesco; Panzera, Ivan; Piscini, Andrea; Salvatore, Walter; Chichi, Francesco; Marconi, Gianpaolo; Maestrini, Daniele; Gammino, Massimo; Mori, Michele

doi:10.1016/j.conbuildmat.2021.124743

Cited by 12 publications

(11 citation statements)

References 43 publications

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“…If we wanted to compare the tension obtained from the numerical simulation, it would be necessary to use some more sophisticated method than the tensile test, for example, the X-ray method, but this was not carried out. This method is described in the article by Morelli et al [ 7 ]. Actual values of limit-equivalent plastic strain and ultimate stress can be obtained from extensive experimental tensile tests of individual wires.…”

Section: Discussionmentioning

confidence: 99%

Simplified Numerical Model for Determining Load-Bearing Capacity of Steel-Wire Ropes

Hroncek,

Marsalek,

Rybansky

et al. 2023

Materials

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Steel-wire rope is a mechanical component that has versatile uses and on which human lives depend. One of the basic parameters that serve to describe the rope is its load-bearing capacity. The static load-bearing capacity is a mechanical property characterized by the limit static force that the rope is able to endure before it breaks. This value depends mainly on the cross-section and the material of the rope. The load-bearing capacity of the entire rope is obtained in tensile experimental tests. This method is expensive and sometimes unavailable due to the load limit of testing machines. At present, another common method uses numerical modeling to simulate an experimental test and evaluates the load-bearing capacity. The finite element method is used to describe the numerical model. The general procedure for solving engineering tasks of load-bearing capacity is by using the volume (3D) elements of a finite element mesh. The computational complexity of such a non-linear task is high. Due to the usability of the method and its implementation in practice, it is necessary to simplify the model and reduce the calculation time. Therefore, this article deals with the creation of a static numerical model which can evaluate the load-bearing capacity of steel ropes in a short time without compromising accuracy. The proposed model describes wires using beam elements instead of volume elements. The output of modeling is the response of each rope to its displacement and the evaluation of plastic strains in the ropes at selected load levels. In this article, a simplified numerical model is designed and applied to two constructions of steel ropes, namely the single strand rope 1 × 37 and multi-strand rope 6 × 7-WSC.

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Section: Discussionmentioning

confidence: 99%

Simplified Numerical Model for Determining Load-Bearing Capacity of Steel-Wire Ropes

Hroncek,

Marsalek,

Rybansky

et al. 2023

Materials

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“…In the figure, the vertical dotted lines correspond to the characteristic values that should be introduced in Equation ( 2) for different values of C.o.V. Another approach has been recently introduced with reference to pre-stressed reinforced concrete bridge [10]. It consists on estimating the Confidence Factor based on the actual number of tests performed n, as well as the distribution of their results.…”

Section: Recent Approachesmentioning

confidence: 99%

Effect of material strength uncertainties on the structural assessment of existing RC bridges

Zizi,

Di Gennaro,

Bencivenga

et al. 2023

ce papers

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The structural assessment of existing bridges is a topic of noteworthy interest for the engineering community given the general conservation state characterizing the infrastructural assets and the need of performing upgrading interventions. One of the key aspects of this process is represented by the material strength definition based on destructive and non‐destructive tests. As for reinforced concrete structures, the design strength determination of both reinforcing steel and concrete should account for the statistical distributions of strength values returned by tensile and compressive tests, respectively, as well as the related confidence factors assumed for the analysis. In this context, existing reinforced concrete structures commonly exhibit a notable dispersion of resistance values making necessary the adoption of improved approaches for design strength determination. The present paper addresses this topic by analyzing the effects of uncertainties on the capacity assessment of reinforced concrete elements which are typical of Italian bridges realized during the last century. The study aims at highlighting how the knowledge process based on investigation campaigns can influence the capacity assessment of existing structures.

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“…By knowing the material composition (i.e., the steel type used for the strand realization) and its elastic properties it is possible to directly evaluate the stress present on the surface of the strand and hence assessing the prestressing force of tendons. However, as X-ray diffractometry supplies a local measure that is, inevitably, affected by the measuring conditions and by the specific point investigated, a reliable procedure is needed to estimate the total prestressing force from the local stress on the wire or strand [25]. Like stress release methods, XRD is an indirect method for assessing the prestressing force, and requires further postprocessing of the data using FE models, or accurate calibration of the relationship between the local stress in the wire and the force of the strand.…”

Section: X-ray Diffractometrymentioning

confidence: 99%

Assessment of bridge Post‐Tensioning systems using non‐destructive (ND) inspection methods

Quaglini,

Pettorruso,

Cattaneo

et al. 2023

ce papers

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Reinforced concrete bridges with post‐tensioned cables are particularly critical structures, as the degradation of the tendons is not fully detectable through conventional investigation methods and/or through visual inspections, due to the intrinsic nature of the structural typology. After shortly reviewing the main applications of current non‐destructive (ND) methods available for investigating the deterioration of tendons and grout, the paper presents a simple procedure to rank these methods through a series of metrics formulated to evaluate the various technologies under four different aspects: accuracy of measurement, ease of use, cost, impact on the operation of the bridge. The procedure has the aim of providing bridge owners with a decision tool which can assist in the selection of the optimal ND technology available to detect a particular strand or grout defect.

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X-ray measure of tensile force in post-tensioned steel cables

Cited by 12 publications

References 43 publications

Simplified Numerical Model for Determining Load-Bearing Capacity of Steel-Wire Ropes

Simplified Numerical Model for Determining Load-Bearing Capacity of Steel-Wire Ropes

Effect of material strength uncertainties on the structural assessment of existing RC bridges

Assessment of bridge Post‐Tensioning systems using non‐destructive (ND) inspection methods

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