کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
266033 504341 2015 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Efficient methodology for the probabilistic safety assessment of high-speed railway bridges
ترجمه فارسی عنوان
روش شناسی کارآمد برای ارزیابی ایمنی احتمالی پل های راه آهن با سرعت بالا
کلمات کلیدی
روش احتمالاتی کارآمد، روش های شبیه سازی، تئوری ارزش افراطی، بهینه سازی استخراج، پل های راه آهن، ترافیک با سرعت بالا
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات مهندسی ژئوتکنیک و زمین شناسی مهندسی
چکیده انگلیسی


• Efficient methodology for the safety assessment of high-speed railway bridges.
• Simulation methods combined with procedures to enhance the efficiency.
• Two safety criteria analyzed to study functions with different complexity degrees.
• Extremely promising results indicating the feasibility of the methodology.

The efficiency of different probabilistic methodologies for the safety assessment of short span railway bridges is compared in the current paper. Two different simulation methods, namely the Monte Carlo and the Latin Hypercube, are combined with two different procedures to enhance the efficiency of the assessment. One of the methods is a tail modelling approach based on the extreme value theory that uses the Generalized Pareto Distribution to model the tail of the obtained distribution. The other one is an Enhanced Simulation procedure which uses an approximation procedure based on the estimates of the failure probabilities at moderate levels for the prediction of the far tail failure probabilities by extrapolation. A composite bridge with six simply supported spans of 12 m and ballasted track is selected as case study for the crossing of the TGV-double high-speed train. The variability of parameters related to the bridge, the track and the train is taken into account along with the existence of track irregularities. The running safety of trains due to loss of contact between the wheel and the rail and the track instability due to excessive deck vibrations are the two safety criteria analyzed, providing examples of limit state functions with different degrees of complexity. The obtained results are extremely promising and indicate the feasibility of the application of this type of methodology in common practice due to the very reasonable computational costs that are required.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Engineering Structures - Volume 101, 15 October 2015, Pages 138–149
نویسندگان
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