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Ian Smith

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Publications associées (221)

A deployable tensegrity footbridge that connects at mid-span

Ian Smith, Nicolas Willy Veuve, Seif Dalil Safaei

This paper describes a near full-scale deployable tensegrity footbridge that deploys from both sides and connects at mid-span. Tensegrity structures are pre-stressed structures composed of tension elements (cables) surrounded by compression elements (strut ...

2015

Using electrical resistance networks to enhance performance assessments of water distribution networks

Ian Smith, Gaudenz Moser, Stephanie Ann German

Pressurized fluid-distribution networks are strategic elements of civil infrastructure. In the case of fresh-water distribution networks, where leaks are common and where real performance is unknown, advanced sensor-based diagnostic methodologies have the ...

2015

Using measurements to reduce model uncertainty for better predictions

Ian Smith, Romain Pasquier

Accurate models of real behaviour that are determined through measurements help engineers avoid expensive interventions and structural replacement. Model calibration by “curve-fitting” measurements to predictions is not appropriate for full-scale structure ...

2015

Error Assessment of Machine Vision Techniques for Object Detection and Evaluation

Ian Smith, Stephanie Ann German

2015

Friction modelling of a deployable tensegrity footbridge

Ian Smith, Seif Dalil Safaei, Ann Christine Sychterz

2015

Sources and forms of modelling uncertainties for structural identification

Ian Smith, Romain Pasquier

The aim of model-based structural identification is to make sense of monitoring data in order to improve knowledge of the real behaviour of structures. Common use of structural-identification techniques involves an assumption of independent zero-mean Gauss ...

2015

Deployment of a tensegrity footbridge

Ian Smith, Nicolas Willy Veuve, Seif Dalil Safaei

Deployable structures are structures that transform their shape from a compact state to an extended in-service position. Structures composed of tension elements that surround compression elements in equilibrium are called tensegrity structures. Tensegritie ...

Asce-Amer Soc Civil Engineers2015

Reducing the uncertainty on the structural behaviour of existing structures through data interpretation

Ian Smith, Pierino Lestuzzi, Yves Sylvain Gilles Reuland

This paper presents a methodology for reducing the uncertainty related to the structural behaviour of an existing building in view of a vulnerability assessment regarding future earthquake actions. Estimating the lateral load resistance is a step towards e ...

2015

Robust system identification and model predictions in the presence of systematic uncertainty

Ian Smith, Romain Pasquier

Model-based data-interpretation techniques are increasingly used to improve the knowledge of complex system behavior. Physics-based models that are identified using measurement data are generally used for extrapolation to predict system behavior under othe ...

Elsevier2015

Evaluating seismic retrofitting efficiency through ambient vibration tests and analytical models

Ian Smith, Pierino Lestuzzi, Yves Sylvain Gilles Reuland, Angelo Garofano

Economic and environmental imperatives lead to an ever growing need to extend the service life of the existing building stock without putting the users at risk. In zones prone to moderate seismic hazard, many buildings were built without considering seismi ...

2015

A framework for optimal sensor placement in full-scale studies of wind around buildings

Ian Smith, Maria Papadopoulou

2015

Performance comparison of reduced models for leak detection in water distribution networks

Ian Smith, Gaudenz Moser, Stephanie Ann German

This paper presents a methodology for comparing the performance of model-reduction strategies to be used with a diagnostic methodology for leak detection in water distribution networks. The goal is to find reduction strategies that are suitable for error-d ...

Elsevier2015

Mid-span connection of a deployable tensegrity footbridge

Ian Smith, Nicolas Willy Veuve, Seif Dalil Safaei

This paper describes a near full-scale deployable tensegrity footbridge. Tensegrity structures are pre-stressed structures composed of tension elements (cables) surrounded by compression elements (struts) in equilibrium. Deployment of two bridge halves is ...

2015

Performance comparison for reduced network models for leak region detection in water distribution networks

Ian Smith, Gaudenz Moser, Stephanie Ann German

2014

Methodologies for predicting natural frequency variation of a suspension bridge

Ian Smith, Irwanda Laory, Ngoc Thanh Trinh

In vibration-based structural health monitoring, changes in the natural frequency of a structure are used to identify changes in the structural conditions due to damage and deterioration. However, natural frequency values also vary with changes in environm ...

Elsevier2014

Improving Fatigue Evaluations of Structures Using In-Service Behavior Measurement Data

Ian Smith, Claire Acevedo, Romain Pasquier, James-Alexandre Goulet

Conservative models and code practices are usually employed for fatigue-damage predictions of existing structures. Direct in-service behavior measurements are able to provide more accurate estimations of remaining-fatigue-life predictions. However, these e ...

American Society of Civil Engineers2014

Hierarchical sensor placement using joint entropy and the effect of modeling error

Ian Smith, Maria Papadopoulou

Good prediction of the behavior of wind around buildings improves designs for natural ventilation in warm climates. However wind modeling is complex, predictions are often inaccurate due to the large uncertainties in parameter values. The goal of this work ...

MDPI AG2014

Toward development of a biomimetic tensegrity footbridge

Ian Smith, Nicolas Willy Veuve, Seif Dalil Safaei

Biomimetic structures interact with their environment, change their properties, learn and self-repair, thereby providing properties that are similar to living organisms. Interactions with the environment involve unique challenges in the field of computatio ...

International Center for Numerical Methods in Engineering (CIMNE)2014

Quantifying the Effects of Modeling Simplifications for Structural Identification of Bridges

Ian Smith, Marie Texier, Clotaire Michel, James-Alexandre Goulet

Several long-span, prestressed, segmental box girder bridges were built in the early 1980s and many of them are affected by long-term residual deformations. Although some models have been proposed to describe their structural behavior, several uncertaintie ...

American Society of Civil Engineers2014

Augmenting simulations with measurements: Application to building-scale wind-flow modeling

Ian Smith, Didier Vernay

This paper focuses on urban environmental system identification. Wind-flow modeling is a challenging task because of simplifications of complex processes as well as geometry simplifications. Even a more detailed model may not be accurate because of uncerta ...

Institute of Electrical and Electronics Engineers ( IEEE )2013

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