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Nguyen K.,IETCC | Avellanosa P.,Dragados Group | Rio O.,IETCC | Rodriguez A.,Dragados Group | Frutos B.,IETCC
Engineering for Progress, Nature and People | Year: 2014

Ambient vibration testing is the most economical non-destructive testing method to acquire vibration data from large civil engineering structures. Using the modal identification techniques the modal parameters can be determined which are effectively used as validation criteria in the context of finite element model updating to develop reliable finite element models of large engineering structures. These updated models will be useful both for predicting the dynamic behaviour and for assisting in the identification of structural damage. In this paper, the finite element model updating of a case study (a twelve story reinforced concrete building) is presented. The modal identification results obtained from ambient vibration measurements of the building are the natural frequencies and the mode shapes of the first lateral and torsional modes which are the dynamic characteristics of interest of this study. The finite element model of the building is developed from the information provided in the design documentatio n. A sensitivity analysis is carried out to determine the most sensitive parameters for FE model. The updating is performed using the genetic algorithm. As results, a good correlation between measured and calculated modal parameters is obtained with parameters updated.


Gorokhovskii A.V.,Saratov State Technical University | Meshcheryakov D.V.,Saratov State Technical University | Burmistrov I.N.,Saratov State Technical University | Spiricheva D.S.,Saratov State Technical University | And 2 more authors.
Glass and Ceramics (English translation of Steklo i Keramika) | Year: 2010

Methods for recycling mixed cullet, which is a constituent of solid common wastes, are analyzed. It is shown that the problem of recycling wastes of this form remains topical. It is established experimentally that the method of mechanochemical activation makes it possible to obtain a mixed alkaline binding substance which is promising for the production of unfired heat-insulating materials with high mechanical properties. © 2010 Springer Science+Business Media, Inc.


Bouteiller V.,University Paris Est Creteil | Cherrier J.-F.,University Paris Est Creteil | L'Hostis V.,CEA Saclay Nuclear Research Center | Rebolledo N.,IETcc | And 2 more authors.
European Journal of Environmental and Civil Engineering | Year: 2012

Reinforcement corrosion is one of the major durability problems that need to be solved in order to extend the service life of a structure. It is influenced, on one hand, by the concrete itself, sound or polluted (chlorinated or carbonated), and on the other hand, by the environmental conditions (controlled or outdoor). To explore the influence of temperature and humidity, electrochemical characterisations (potential, linear polarisation resistance and corrosion rate) were carried out on reinforced concrete prisms. A database of more than 3000 values has been delivered. The results enabled us to deduce that both parameters have influences on each other. Moreover, considering the four concretes, the corrosion order obtained in controlled conditions may be different from the one obtained in outdoor conditions. © 2012 Taylor & Francis.


Elices M.,Technical University of Madrid | Valiente A.,Technical University of Madrid | Caballero L.,Technical University of Madrid | Iordachescu M.,Technical University of Madrid | And 3 more authors.
Engineering Failure Analysis | Year: 2012

Three broken steel bars from a sewed crack in a dam are reported. The inspection of the fracture surfaces of the prestressed bars suggests that fractures were triggered by small cracks and by the inherent brittleness of the bars, as fracture toughness was about 40MPam 1/2. The analysis of the failures shows that the usual design requirements for prestressing bars fail to warn against brittle failures if some damage exists. Some recommendations, based on the concept of damage tolerance, are suggested to avoid similar unfortunate incidents. © 2012 Elsevier Ltd.


Schneider U.,Vienna University of Technology | Alonso M.C.,IETcc | Pimienta P.,CSTB | Jansson R.,SP Technical Research Institute of Sweden
Structures in Fire - Proceedings of the Sixth International Conference, SiF'10 | Year: 2010

The following report gives an overview of the TC program and some preliminary results.


Nevshupa R.,IETCC | Hiratsuka K.,Chiba Institute of Technology
NanoScience and Technology | Year: 2015

This works seeks to summarize recent advances in experimental studying of triboluminescence—defined here as the light emission when a material is subjected to rubbing, scratching, rolling, impacting or other mechanical agitation—and elucidate the basic mechanisms whereby triboluminescence is excited. © Springer International Publishing Switzerland 2015.


Lee S.F.,IETCC | Sanchez J.,IETCC | Fullea Garcia J.,IETCC | Andrade C.,IETCC
Engineering for Progress, Nature and People | Year: 2014

In this study, the high-strength corrugated steel wire with a diameter of 7.6 mm was subjected to different aerated alkaline mediums (pH8.2, 12.3 and 13.4) with different concentration of Cl-. The electrochemical cell was consisted of a working electrode, an auxiliary electrode and a reference electrode, which was the steel wire, the graphite rod and the Ag/AgCl in KCl saturated, respectively. The open circuit potential measurement that lasted for 8 hours and the potentiodynamic polarization measurement from -900 mV to +500 mV were performed on the steel in each different medium and Cl- concentration. After the measurement, the steel surface was examined under the light microscope to find out the types of corrosions that occurred on the steel. Regardless of the Cl- concentration, it is found that at the medium of pH8.2 general corrosions are seen on the steel surface, at pH12.3 pitting corrosions, while at pH13.4 no corrosion is observed on the steel.

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