ГОСТ 26493–85 регламентирует параметры вибрации оборудования целлюлозно-бумажных производств. Однако этот стандарт устарел, не учитывает современные конструкции технологического оборудования и требования новых государственных и международных стандартов. В статье сделана попытка нормирования и мониторинга вибрации технологического оборудования с уче...
Tamping and ballast wear, due to dynamic stresses, lead to frequent and costly maintenance operations. To mitigate the impact, an innovative track structure combining a bituminous (asphalt concrete) layer below the ballast has been built on the Bretagne-Pays de la Loire High-Speed Line (BPL HSL). The track is intended to reduce the amplitude of the...
Les présentes recommandations définissent des dispositions destinées à prévenir les dégradations du béton par des cycles de gel-dégel avec ou sans sels de déverglaçage. Le domaine d'application est celui des bâtiments non courants ou des ouvrages de génie civil soumis à du gel modéré avec emploi de sels de déverglaçage ou à du gel sévère. Elles s'a...
The use of optical fiber for measuring strain and or temperature is increasing in civil engineering. Optical fiber is known to be relatively cheap, compared to the more traditional sensors commonly used, and can, depending on the chosen technology, give a complete distribution along the instrumented element, which can be very interesting in case of...
In this study, scour-based vibrations of bridge piers are investigated using a bridge model in a water flume: first, the eigenmode corresponding to the measured frequencies of pier-like structures is identified. Secondly, the effect of the pier-deck interaction is studied. Finally, a theoretical model is proposed to characterize the pier vibration,...
Massive underground storage of hydrogen could be a way that excess energy is produced in the future, provided that the risks of leakage of this highly flammable gas are managed. The ROSTOCK-H research project plans to simulate a sudden hydrogen leak into an aquifer and to design suitable monitoring, by injecting dissolved hydrogen in the saturated ...
Bridges are one of the oldest types of civil engineering structures and the interaction between the transport and hydrographic networks represents a significant issue in a country such as France. Recently, various cases highlight the importance and vulnerability of civil transport works in relation to their environmental hazards, e.g. floods, and t...
High-speed railway lines design and durability constitute major challenges in the railway transportation field. In France, a 40-year feedback on field behaviour of ballasted tracks led to improvement of the design rules. Settlement and wear of ballast, caused by dynamic stresses at high frequency, however remains a major problem on high-speed track...
The phenomena of settlement and wear of the ballast under dynamic stresses lead to high frequencies and high maintenance costs on high-speed railway lines. Studies have shown that these settlements are linked to high accelerations produced in the ballast by the passage of high-speed trains (HST). A layer of asphalt concrete (GB) was introduced unde...
Published in Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research
Routine bone mineral density (BMD) monitoring of individuals during the initial 5 years of anti-osteoporosis treatment is controversial. Using a registry-based cohort from the Province of Manitoba, Canada, we compared anti-osteoporosis medication use and fracture outcomes in women with versus without BMD monitoring receiving anti-osteoporosis medic...
