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- 저자 : Petr Lehner (검색결과 2 건)
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Probabilistic time-dependent sensitivity analysis of HPC bridge deck exposed to chlorides
Pratanu Ghosh,Petr Konečný,Petr Lehner,Paul J. Tikalsky 사단법인 한국계산역학회 2017 Computers and Concrete, An International Journal Vol.19 No.3
A robust finite element based reinforced concrete bridge deck corrosion initiation model is applied for time-dependent probabilistic sensitivity analysis. The model is focused on uncertainties in the governing parameters that include variation of high performance concrete (HPC) diffusion coefficients, concrete cover depth, surface chloride concentration, holidays in reinforcements, coatings and critical chloride threshold level in several steel reinforcements. The corrosion initiation risk is expressed in the form of probability over intended life span of the bridge deck. Conducted study shows the time-dependent sensitivity analysis to evaluate the significance of governing parameters on chloride ingress rate, various steel reinforcement protection and the corrosion initiation likelihood. Results from this probabilistic analysis provide better insight into the effect of input parameters variation on the estimate of the corrosion initiation risk for the design of concrete structures in harsh chloride environments.
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Temperature and Structural Analysis of Omega Clip
Jakub Flodr,Martin Krejsa,Petr Lehner 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.4
Cold-formed thin-walled cross sections are very frequently and effi ciently used as secondary construction elements as well as self-supporting cladding systems. Typically, they are used on hall-type buildings and other lightweight structures. The primary advantage of thin-walled cross sections is their ratio between self-weight and load bearing capacity. Another important factor is their easy installation. The main disadvantage of thin-walled cross sections is their low resistance to fi re. Their low weight and thin cross section can cause higher temperature increase in the element compared with hot-rolled or welded cross sections. This is undesirable with respect to the load bearing capacity. The article deals with numerical modelling of thin-walled omega clip under temperature and force load. Two calculations—heat passage by radiation and structural analysis using temperature analysis outputs—are combined. The temperature values as input data for the temperature analysis are sourced from the physical experiments conducted.
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