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Engineering mechanics 2015. 21st International conference May 11-14, 2015, Svratka, Czech Republic. Extended abstracts
Náprstek, Jiří ; Fischer, Cyril
The book of extended abstracts contains the papers presented at the 22nd International Conference on Engineering Mechanics, which has been held in Svratka resort in Czech Republic under auspices of the Czech Society of Mechanics and being a part of IFTOMM (The International Federation for the Promotion of Mechanism and Machine Science) activities. As it corresponds with character of the conference, this proceedings book consists of several topic oriented parts: Linear and Nonlinear Dynamics and Stability, Aeroelasticity, Hydroelasticity and Fluid Mechanics, Biomechanics, Fracture Mechanics, Mechatronics, Reliability of Structures, Mechanics of Solids, Thermomechanics. The publication represents a well-balanced overview of theoretical, numerical and experimental work on fundamental and applied studies.
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Contribution to the solution of a fatigue problem considering the durability of temporary bridges structures
Rieger, M. ; Marek, Pavel
The article presents the fatigue life estimate of a temporary, high strength steel bridge for tram traffic built in 1977 in Prague. Fatigue life assessment is now based on fully probabilistic concept. The loading as well as response history was considered and a fatigue criterion, based on the stress-range concept, was applied. Crack growth was modelled using LEFM procedures and compared with observed real cracks in the bottom flanges after about three and a half years of use. In the end the bridge had to be removed.
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Reference functions and values
Marek, Pavel
The current structural reliability assessment criteria (corresponding to the prescriptive Limit States Design concept such as Eurocode and AISC-LRFD) are expressed by comparing the specified maximum load effects and minimum specified resistance. In the qualitatively different gradually developed probabilistic reliability assessment procedures(applicable in codes) clear definitions of the „reference“ functions and values applied in the calculation of the probability of failure must be specified and adequate target probabilities must be given considering tolerable risk, economical requirements and some other measures.
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