نویسندگان
1 گروه مهندسی عمران، دانشگاه صنعتی بیرجند
2 گروه مهندسی عمران، دانشگاه زابل
چکیده
در این مقاله یک روش کارا و توانمند به‌منظور ارزیابی قابلیت اعتماد فازی سازه‌ها تحت عدم قطعیت‌های آماری متغیرهای تصادفی ارائه شده است. این روش، تحت عنوان روش فازی- دینامیکی انتقال پایدار امتدادی نامگذاری شده که متشکل از دو حلقه داخلی و خارجی است. در حلقه داخلی روش تحلیل قابلیت اعتماد مرتبه اول به‌صورت دینامیکی بر اساس روش انتقال پایدار، بهبودیافته است. تحلیل فازی در حلقه خارجی با استفاده از رویکرد بهینه‌سازی مجموعه‌های آلفا برش بر پایه الگوریتم ژنتیک پایه‌گذاری شده است. عملکرد الگوریتم ارائه شده برای سه مثال غیرخطی ارزیابی شده که نتایج بیانگر بهبود کارایی و توانمندی روش دینامیکی انتقال پایدار در در مقایسه با روش معمول تحلیل قابلیت اعتماد مرتبه اول است.
کلیدواژه‌ها
عنوان مقاله [English]
Fuzzy Structural Reliability Analysis using the Dynamic Directional Stability Transformation Method
نویسندگان [English]
- M. Bagheri 1
- B. Keshtegar 2
چکیده [English]
In this paper, a new method is proposed for fuzzy structural reliability analysis; it considers epistemic uncertainty arising from the statistical ambiguity of random variables. The proposed method, namely, fuzzy dynamic-directional stability transformation method, includes two iterative loops. An internal algorithm performs the reliability analysis using the dynamic-directional stability transformation method and an external algorithm performs the fuzzy analysis by applying the alpha-cut level optimization method based on the genetic algorithm. Implementation of the proposed method, which solves some nonlinear performance functions, indicates the efficiency and robustness of the dynamic-directional stability transformation method, as compared to other first order reliability methods.
کلیدواژه‌ها [English]
- Fuzzy reliability
- Dynamical stability transformation method
- Alpha-cut level optimization
- genetic algorithm
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