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Your search keyword '"Whittle, Andrew"' showing total 19 results
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19 results on '"Whittle, Andrew"'

2. Depth‐damage curves for rail rapid transit infrastructure

Author

Massachusetts Institute of Technology. Department of Civil and Environmental Engineering, Martello, Michael V, Whittle, Andrew J, Lyons-Galante, Hannah R, Massachusetts Institute of Technology. Department of Civil and Environmental Engineering, Martello, Michael V, Whittle, Andrew J, and Lyons-Galante, Hannah R

Published
2023

9. Proof of concept of wireless TERS monitoring

Author

Massachusetts Institute of Technology. Department of Civil and Environmental Engineering, Whittle, Andrew, Allen, Michael, Gaura, Elena, Wilkins, Ross, Brusey, James, Dong, Yuepeng, Massachusetts Institute of Technology. Department of Civil and Environmental Engineering, Whittle, Andrew, Allen, Michael, Gaura, Elena, Wilkins, Ross, Brusey, James, and Dong, Yuepeng

Abstract

Temporary earth retaining structures help prevent collapse during construction excavation. To ensure that these structures are operating within design specifications, load forces on supports must be monitored. Current monitoring approaches are expensive, sparse, off-line, and thus difficult to integrate into predictive models. This work aims to show that wirelessly connected battery powered sensors are feasible, practical, and have similar accuracy to existing sensor systems. We present the design and validation of ReStructure, an end-to-end prototype wireless sensor network for collection, communication, and aggregation of strain data. ReStructure was validated through a 6-month deployment on a real-life excavation site with all but one node producing valid and accurate strain measurements at higher frequency than existing ones. These results and the lessons learnt provide the basis for future widespread wireless temporary earth retaining structure monitoring that increase measurement density and integrate closely with predictive models to provide timely alerts of damage or potential failure.

Published
2018

11. Editorial

Author

Darve, Felix, primary, de Borst, Rene, additional, and Whittle, Andrew, additional

Published
2012
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14. Announcement

Author

Darve, Félix, primary, Sture, Stein, additional, de Borst, René, additional, Whittle, Andrew J., additional, and Smith, Ian M., additional

Published
2009
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15. Lrrk2 and Lewy body disease

Author

Ross, Owen A., primary, Toft, Mathias, additional, Whittle, Andrew J., additional, Johnson, Joseph L., additional, Papapetropoulos, Spiridon, additional, Mash, Deborah C., additional, Litvan, Irene, additional, Gordon, Mark F., additional, Wszolek, Zbigniew K., additional, Farrer, Matthew J., additional, and Dickson, Dennis W., additional

Published
2006
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19. A multiaxial inertial macroelement for bridge abutments

Author

Davide Noè Gorini, Luigi Callisto, Andrew J. Whittle, Salvatore Sessa, Gorini, Davide Noè, Callisto, Luigi, Whittle, Andrew J., and Sessa, Salvatore

Subjects
Mechanics of Materials, hyper-plasticity, OpenSees, soil-abutment interaction, macroelement, inertial effects, Computational Mechanics, General Materials Science, Geotechnical Engineering and Engineering Geology, hyper-plasticity, inertial effects, macroelement, OpenSees, soil–abutment interaction
Abstract

This paper proposes a multiaxial macroelement for bridge abutments that can be included in the global structuralmodel of a bridge to carry out nonlinear dynamic analyses with very much smaller computational effort than can be achieved using continuum representations of embankment and foundation soil behaviour. The proposed macroelement derives a constitutive force–displacement relationship within a rigorous thermodynamic framework and includes important features of non-linearity and directional coupling in characterizing the interactions of the abutment with the soil. In a dynamic analysis, the frequency-dependent response of the system is simulated through the combination of the macroelement with appropriate participating masses. The calibration procedure of the macroelement is based on the assessment of its ultimate capacity and of its response at small displacements, and it is shown that these ingredients can be derived through standardised procedures. In the paper, the macroelement response is validated against the results of fully coupled continuum numerical analyses for a reference soil–abutment system, under both static and seismic loading conditions. We show that the two models achieve similar predictions of maximum and permanent abutment deformations (less than 10–14% difference, respectively) for a suite of three-axis seismic loading events.

Published
2023
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