Full-scale tests to measure stresses and vertical displacements in an 18.34m-diameter agricultural steel silo roof

Ramírez-Gómez, Álvaro; Gallego, E.; Fuentes, José María; González-Montellano, C.; Porras-Prieto, Carlos Javier; Ayuga, Francisco

doi:10.1016/j.compag.2014.05.008

Cited by 4 publications

(8 citation statements)

References 26 publications

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“…The constrains applied to the model, and the assumptions considered with regard to the joints of the roof structure are widely described and explained in Ramı´rez-Go´mez et al (2014). The simulation of snow loads in the numerical model was developed by applying static loads at the beam locations corresponding to the loading points in the experimental tests conducted.…”

Section: The 3d Beam Modelmentioning

confidence: 99%

“…The location of the eight dynamometers (D1-D8) used to measure the applied loads for the balanced load test type and sector load test type is shown in Figure 4. A detailed description of the technical specifications of the dynamometers installed can be found in Ramı´rez-Go´mez et al (2014). Table 1 shows detailed information about the loads measured for every step in the different tests conducted.…”

Section: Load Application Systemmentioning

confidence: 99%

“…The readings from the fleximeters were recorded using a DATA-TAKER DT50 datalogger. A more detailed description of the location and the technical specifications of the instrumentation can be found in Ramı´rez-Go´mez et al (2014).…”

Section: Instrumentation Of the Testsmentioning

confidence: 99%

“…The main objective of this work is to compare the normal stresses and displacements produced in a conical steel silo roof structure by employing non-drifted (balanced) and drifted (unbalanced) snow loads. In addition, the validity of a numerical three-dimensional (3D) model developed by the authors (Ramı´rez-Go´mez et al, 2014) was checked in order to predict the effects of drifted snow loads on the conical silo roof structure.…”

Section: Introductionmentioning

confidence: 99%

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Effects of different snow load arrangements on steel silo roof structures

Gallego

Fuentes

Ramírez-Gómez

et al. 2017

Advances in Structural Engineering

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Large diameter steel silos usually require a beam structure to support rooftop inspection gangways and resist loads derived from the snow and wind actions. The existence of localized overloads caused by drifted snow on roofs as a consequence of the wind action has been reported in the literature. European standard EN 1991-1-3 also considers the need of taking into account asymmetric patterns for snow loads calculation. However, conical roofs are not included in the specific list of cases considered by this standard. The present work compares the normal stresses and displacements produced in a conical steel silo roof structure by applying balanced loads distributed on the whole roof and unbalanced loads applied on a roof sector. Experimental measurements and a three-dimensional beam model developed by the authors have been used to predict the stresses and vertical displacements of a metal silo roof structure measuring 18.34 m in diameter. The results show that the existence of an asymmetric load pattern produces higher normal stresses (up to 23%) and vertical displacements (up to 50%) than those derived from balanced loads, for any similar load per beam considered.

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Section: The 3d Beam Modelmentioning

confidence: 99%

Section: Load Application Systemmentioning

confidence: 99%

Section: Instrumentation Of the Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of different snow load arrangements on steel silo roof structures

Gallego

Fuentes

Ramírez-Gómez

et al. 2017

Advances in Structural Engineering

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“…The instrumentation of real-scale structures allows the acquisition of more realistic data, by reliably measuring the interaction between the granular medium and the containment structure and enabling the evaluation of the tensions caused by the products stored in both static and dynamic conditions (Couto et al, 2012;, Ruiz et al, 2012Lopes Neto et al, 2014b, Ramírez et al, 2014, Fank et al, 2015.With reliable field results, it is possible to minimize limiting aspects to the design of these structures, contributing to a future and adequate standardization of silo designs and thus to mitigate the problems of collapses. In this study, the vertical and friction compression pressures of a silo in real scale were measured experimentally, comparing them with the theoretical values of the AS 3774, EN 1991-4 and ANSI / ASAE EP433 foreign standards.…”

Section: Introductionmentioning

confidence: 99%

Vertical Pressures and Compressive Friction Force in a Large Silo

et al. 2018

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The grain flow is a dynamic phenomenon of high non-linearity, responsible for the occurrence of a high index of structural problems in silos, assuming particular interest in Brazil because the country does not have a standard of design of these structures. In order to determine the transfer of loads to the foundations, a silo in true magnitude was instrumented through pressure cells in the reinforced concrete slab of the bottom and through load cells under two of its column. The experiment was conducted during the period from December 2016 to February 2017 in Entre Rios do Oeste-PR. The profiles of vertical and the compression friction pressures were obtained during the loading, storage and unloading phases of corn grains. The vertical pressure distribution in the silo bottom was shown to be variable along its radius, in accordance with the formulation of the AS 3774 standard, an alternative to the simplified uniform distribution hypothesis prescribed by the EN 1991-4 and ANSI/ASAE EP433 standards. We also observed experimentally the non-occurrence of overpressure at the unloading of the silo under analysis. The load transfer coefficient to the column was 0.35, being that the ANSI/ASAE EP433, EN 1991-4 and AS 3774 standards increased this transfer by 6.57%, 35.91% and 75.03% respectively, reflecting the great divergence between these prescriptions.

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A “principal stress cap” model for stresses in a circular silo with an off-centre circular core: Finite core models, including filled silos, incipient flow and switch stresses

Matchett

Langston

McGlinchey

2016

Chemical Engineering Research and Design

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Stresses have been modelled in a silo with offset centre of stress and finite circular core, using the methodology developed in Matchett, Langston and McGlinchey, CHERD(2015), vol 93, 330-348. Several types of core-annulus stress interactions have been proposed and some of the problems in the original Virtual Core model have been ameliorated. However, the selection of the most appropriate model is limited by lack of data on internal stress distributions within silos and the observation that different internal structures can give similar wall stress values.Passive systems with convex stress cap and active stress systems with concave stress cap have been modelled. In order to keep wall shear stresses and internal stresses below the yield limits, the model suggests that deep, completely-filled silos would have very small values of wall arc normal angles,  c and  w and stress eccentricity, Ecc. Deep, filled silos with high stress eccentricity and large wall normal angles are not viable.Incipient flow and the stress switch have been simulated. Output data suggest wide variation in wall stresses both axially and azimuthally are possible, at high stress eccentricities, which would have structural implications.

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Full-scale tests to measure stresses and vertical displacements in an 18.34m-diameter agricultural steel silo roof

Cited by 4 publications

References 26 publications

Effects of different snow load arrangements on steel silo roof structures

Effects of different snow load arrangements on steel silo roof structures

Vertical Pressures and Compressive Friction Force in a Large Silo

A “principal stress cap” model for stresses in a circular silo with an off-centre circular core: Finite core models, including filled silos, incipient flow and switch stresses

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