Optimal strain-gauge placement for mechanical load estimation in circular cross-section shafts

Iriarte, Xabier; Aginaga, Jokin; Gainza, G.; Ros, Javier; Bacaicoa, J.

doi:10.1016/j.measurement.2020.108938

Cited by 13 publications

(12 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…( 1 ). For this purpose, the outer perimeter of the central ring is instrumented by the uniform distribution of bi-directional strain gauges connected in series by a full Wheatstone bridge configuration 52 – 55 . where F = Stress in the suspension cable; σ = Normal stress; dΩ = Differential area at the central ring; ɛ i = Normal strain at the ith strain gauge; n = Number of strain gauges; E a = Modulus of elasticity of steel; Ω c = Area of the central ring.…”

Section: Application In the Construction Process Of The Tajo River Vi...mentioning

confidence: 99%

“…It was necessary to complement these sensors with other types of sensors to characterize the strain variations in the cables. It was decided to install two unidirectional strain gauges on one of the seven wires that make up one of the strands, connected together using a full Wheatstone bridge configuration 52 – 55 . This technology allows for the instrumentation of cables once loaded and enables the empirical characterization of the strain increases experienced by the cable.…”

Section: Application In the Construction Process Of The Tajo River Vi...mentioning

confidence: 99%

See 1 more Smart Citation

Temporary cable force monitoring techniques during bridge construction-phase: the Tajo River Viaduct experience

Gaute-Alonso

Alonso-Cobo

Calderon-Uriszar-Aldaca

2022

Sci Rep

View full text Add to dashboard Cite

This article deals with the comparative analysis of current cable force monitoring techniques. In addition, the experience of three cable stress monitoring techniques during the construction phase is included: (a) the installation of load cells on the active anchorages of the cables, (b) the installation of unidirectional strain gauges, and (c) the evaluation of stresses in cables applying the vibrating wire technique by means of the installation of accelerometers. The main advantages and disadvantages of each technique analysed are highlighted in the Construction Process context of the Tajo Viaduct, one of the most singular viaducts recently built in Spain.

show abstract

Section: Application In the Construction Process Of The Tajo River Vi...mentioning

confidence: 99%

Section: Application In the Construction Process Of The Tajo River Vi...mentioning

confidence: 99%

Temporary cable force monitoring techniques during bridge construction-phase: the Tajo River Viaduct experience

Gaute-Alonso

Alonso-Cobo

Calderon-Uriszar-Aldaca

2022

Sci Rep

View full text Add to dashboard Cite

show abstract

“…The model is made of methacrylate, as the relatively low elastic modulus of this material (E=3,300 MPa) facilitates the loading operation and allows the bearing devices of the structural model to be simplified. To empirically characterise the structural response of the small scale model, 2 groups of sensors are installed (Figure 7): (a) five potentiometer displacement transducer units to determine the value of the deflection experienced at mid span section; b) five strain gauge units to determine the deformation experienced [24][25][26] by the lower fibre of the girders at their mid span section. The acquisition, recording, and monitoring of the data provided by the sensors is done using a Structural Monitoring System (SMS) composed of the following elements: Three load tests were simulated, each consisting of applying a point load of 138 N at a distance corresponding to one third of the total length of longitudinal girders "1", "2", and "3" of the girder bridge.…”

Section: Small-scale Model Test In Laboratorymentioning

confidence: 99%

“…(a) a modular central data acquisition and processing unit (MCDA&PU) model NI-CDAQ-9188 with the capacity to simultaneously manage the signal from up to eight Data Acquisition Units (DAU); (b) a NI-9205 voltage DAU used to process analogue signals from potentiometric displacement transducers; (c) an extensometer DAU model NI-9237 that powers the Wheatstone Bridge's electronic assembly of extensometers and processes the analogue signal from these sensors[26,27]; (d) a Power Supply (PS) that needed to power potentiometric displacement transducers; (e) a workstation responsible for communicating with the MCDA&PU and recording and viewing data provided by sensors through a Data Acquisition and Monitoring Program designed and programmed by the authors (Figure8).…”

mentioning

confidence: 99%

Novel Method for an Optimised Calculation of the Cross-Sectional Distribution of Live Loads on Girder Bridge Decks

Gaute-Alonso

Calderon-Uriszar-Aldaca

Castillo

2022

Civ Eng J

View full text Add to dashboard Cite

One of the main goals in the design of girder bridge deck systems is to determine the cross-sectional distribution of live loads across the different girders that make up the cross-section of the deck. Structural grillage models and current bridge design standards based on a Load Distribution Factor (LDF) provide oversized designs, as demonstrated in this paper. This research introduces a novel method that allows the cross-sectional distribution of live loads on girder bridge decks to be calculated by applying a matrix formulation that reduces the structural problem to 2 degrees of freedom for each girder: the deflection and the rotation of the deck-slab at the centre of the girder’s span. Subsequently, a parametric study is presented that analyses the structural response of 64 girder bridge decks to a total of 384 load states. In addition, the authors compare the outputs of the novel method with those obtained using traditional grillage calculation methods. Finally, the method is experimentally validated on two levels: a) a laboratory test that analyses the structural response of a small-scale girder bridge deck to the application of different load states; b) a real full-scale girder bridge load test that analyses the structural response of the bridge over the Barbate River during its static load test. Based on this analysis, the maximum divergence of the proposed method obtained from the experimental structural response is less than 10%. The use of the proposed novel analysis method undoubtedly provides significant savings in material resources and computing time, while contributing to minimizing overall costs. Doi: 10.28991/CEJ-2022-08-03-01 Full Text: PDF

show abstract

“…Considering a linear, elastic and isotropic material, the compound stress tensor is determined by superposition of the individual ones. Using linear elasticity the strain tensor is derived and its components are projected in the basis 1 2 3 to obtain the strain of the gauge ε [9].…”

Section: Strain Model Of a Single Gaugementioning

confidence: 99%

Mechanical sensitivity analysis of strain gauge configurations in the main shaft of wind turbines

Bacaicoa

Iriarte

Aginaga

et al. 2022

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Wind turbines are reaching their remaining useful life, thus it is important to guarantee the well status of its components. A common way to check the status is to measure the loads on the Low Speed Shaft with strain gauges, but not always are bonded perfectly. In this work a sensitivity analysis of strain gauge configurations is carried out, where the influence of geometric and material parameters, and misplacement and misalignment parameters is analyzed. An analytical model for a single gauge was developed, obtaining a relation between the exerted loads and the strain measured by the strain gauge. By means of Taylor approximations the estimated loads were approached in order to have into account the influence of the uncertainty of parameters. Results shown that the sensitivities with respect to the geometric and material parameters did not depend on the secondary loads while in the sensitivities with respect to the gauge bonding parameters the cross-talk effect was present. In order to obtain realistic numerical results, a horizontal-axis NREL 5-MW wind turbine was simulated in OpenFAST with two wind-speed scenarios. The uncertainty of the estimated loads by the strain gauge configurations was calculated.

show abstract

Optimal strain-gauge placement for mechanical load estimation in circular cross-section shafts

Cited by 13 publications

References 14 publications

Temporary cable force monitoring techniques during bridge construction-phase: the Tajo River Viaduct experience

Temporary cable force monitoring techniques during bridge construction-phase: the Tajo River Viaduct experience

Novel Method for an Optimised Calculation of the Cross-Sectional Distribution of Live Loads on Girder Bridge Decks

Mechanical sensitivity analysis of strain gauge configurations in the main shaft of wind turbines

Contact Info

Product

Resources

About