|   | 
Details
   web
Records
Author Beltran, J.F.; Nunez, E.; Nunez, F.; Silva, I.; Bravo, T.; Moffat, R.
Title Static response of asymmetrically damaged metallic strands: Experimental and numerical approach Type
Year 2018 Publication Construction And Building Materials Abbreviated Journal Constr. Build. Mater.
Volume (down) 192 Issue Pages 538-554
Keywords Asymmetric damaged strands; Surface damage; Numerical model; Finite element simulation; Experimental test; Static capacity curve
Abstract In this study, the effect of the presence of broken wires (damage) asymmetrically distributed on metallic strands surfaces on their static response is assessed. To this end, a general mechanical model for multi layered strands is presented, in which damaged strands are treated as a 1D nonlinear beam under uncoupled biaxial bending and axial load (NLBM). The NLBM is validated by comparisons with the results obtained from an experimental program especially designed for studying the effect of surface damage distribution on strands response and 3D nonlinear finite element simulations. Analyses are carried out on two strand constructions: 1 x 7 and 1 x 19, in which the damage levels and strand diameters vary from 5% to 40% and from 3.5 mm to 22.2 mm, respectively. Results indicate that the NLBM accurate predicts the static response (residual strength, stiffness, axial strain field, and deformed configuration) of the asymmetrically damaged strands, achieving good computational efficiency and numerical robustness. (C) 2018 Elsevier Ltd. All rights reserved.
Address [Felipe Beltran, Juan] Univ Chile, Dept Civil Engn, Blanco Encalada 2002 Of 440, Santiago, Chile, Email: jbeltran@ing.uchile.cl;
Corporate Author Thesis
Publisher Elsevier Sci Ltd Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0950-0618 ISBN Medium
Area Expedition Conference
Notes WOS:000453494600046 Approved
Call Number UAI @ eduardo.moreno @ Serial 953
Permanent link to this record
 

 
Author Caceres, C.; Moffat, R.; Pakalnis, R.
Title Evaluation of flexural failure of sill mats using classical beam theory and numerical models Type
Year 2017 Publication International Journal Of Rock Mechanics And Mining Sciences Abbreviated Journal Int. J. Rock Mech. Min. Sci.
Volume (down) 99 Issue Pages 21-27
Keywords Sill mat; Numerical model; Mining; Flexural failure
Abstract
Address [Caceres, Cristian; Moffat, Ricardo] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Santiago, Chile, Email: cristian.caceres@uai.cl
Corporate Author Thesis
Publisher Pergamon-Elsevier Science Ltd Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1365-1609 ISBN Medium
Area Expedition Conference
Notes WOS:000415594900003 Approved
Call Number UAI @ eduardo.moreno @ Serial 793
Permanent link to this record
 

 
Author Gonzalez, E.; Villena, M.J.
Title On the spatial dynamics of vaccination: A spatial SIRS-V model Type
Year 2020 Publication Computers & Mathematics With Applications Abbreviated Journal Comput. Math. Appl.
Volume (down) 80 Issue 5 Pages 733-743
Keywords Epidemic dynamics; Spatial SIR model; Vaccination strategy; Non-linear system of partial differential equations; Numerical modeling
Abstract In this paper, we analyze the effects of vaccination from a spatial perspective. We propose a spatial deterministic SIRS-V model, which considers a non-linear system of partial differential equations with explicit attrition and diffusion terms for the vaccination process. The model allows us to simulate numerically the spatial and temporal dynamics of an epidemic, considering different spatial strategies for the vaccination policy. In particular, in our first example we analyze the classical SIRS-V evolution with the addition of movements due to diffusion, while in the second one we focus on modeling one ring vaccination policy. We expect this model can improve spatial predictions of SIR vaccination models by taking into account the spatial dimension of the problem. (C) 2020 Elsevier Ltd. All rights reserved.
Address [Gonzalez, Eduardo] Univ Finis Terrae, Fac Engn, Santiago, Chile, Email: e.gonzalez@ieee.org;
Corporate Author Thesis
Publisher Pergamon-Elsevier Science Ltd Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0898-1221 ISBN Medium
Area Expedition Conference
Notes WOS:000557765800010 Approved
Call Number UAI @ alexi.delcanto @ Serial 1220
Permanent link to this record
 

 
Author Moffat, R.; Caceres, C.; Tapia, E
Title Rock Pillar Design Using a Masonry Equivalent Numerical Model Type
Year 2021 Publication Energies Abbreviated Journal Energies
Volume (down) 14 Issue 4 Pages 890
Keywords rock pillar; design numerical model; mining; underground stability
Abstract In underground mining, the design of rock pillars is of crucial importance as these are structures that allow safe mining by maintaining the stability of the surrounding excavations. Pillar design is often a complex task, as it involves estimating the loads at depths and the strength of the rock mass fabric, which depend on the intact strength of the rock and the shape of the pillar in terms of the aspect ratio (width/height). The design also depends on the number, persistence, orientation, and strength of the discontinuities with respect to the orientation and magnitude of the stresses present. Solutions to this engineering problem are based on one or more of the following approaches: empirical design methods, practical experience, and/or numerical modeling. Based on the similarities between masonry structures and rock mass characteristics, an equivalent approach is proposed as the one commonly used in masonry but applied to rock pillar design. Numerical models using different geometric configurations and state of stresses are carried out using a finite difference numerical approach with an adapted masonry model applied to rocks. The results show the capability of the numerical approach to replicate common types of pillar failure modes and stability thresholds as those observed in practice.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1996-1073 ISBN Medium
Area Expedition Conference
Notes WOS:000623469900001 Approved
Call Number UAI @ alexi.delcanto @ Serial 1350
Permanent link to this record