پیش‌بینی پارامترهای چسبندگی الیاف فولادی هوک شکل و بتن با استفاده از شبکه‌های عصبی مصنوعی
محورهای موضوعی : آنالیز سازه - زلزله
امیر ابراهیم اکبری بقال
1
(عضو هیات علمی دانشگاه ازاد اسلامی)
کلید واژه: الیاف فولادی, شبکه عصبی مصنوعی, نیروی بیرون‌کشیدگی, مدل المان محدود. ,
چکیده مقاله :
با توجه به اهمیت بکارگیری الیاف فولادی در تقویت بتن، در تحقیق حاضر با استفاده از شبکه‌های عصبی مصنوعی به پیش‌بینی رفتار بیرون کشیدگی الیاف فولادی هوک شکل از بتن پرداخته شده است. به دلیل محدودیت داده‌های جامع آزمایشگاهی، از داده‌های به دست آمده از تحلیل المان محدود به عنوان ورودی شبکه عصبی استفاده شده است. به منظور شبیه‌سازی بیرون کشیدگی الیاف از روش المان محدود سه‌بعدی و نرم‌افزار آباکوس استفاده می‌شود. در مدل المان محدود، اندرکنش بین الیاف و بتن با استفاده از مفهوم ناحیه انتقالی سطح مشترک شبیه‌سازی شده است که پارامترهای آن با استفاده از روش المان محدود معکوس و استفاده از نتایج تست تجربی بیرون‌کشیدگی انجام پذیرفته بر روی یک نمونه الیاف به دست آمده است. پس از صحت‌سنجی نتایج مدل عددی با نتایج تجربی، نتایج به ازای پارامترهای مؤثر الیاف استخراج شده و بر اساس آنها مدل‌سازی با استفاده از شبکه‌های عصبی صورت گرفته است. پیش‌بینی نیروی بیرون‌کشیدگی توسط شبکه‌های عصبی مصنوعی چندلایه و الگوریتم آموزش انتشار به عقب، با تکنیک بهینه‌سازی مارکورادت-لونبرگ انجام شده است. نتایج نشان می‌دهد که مدل شبکه عصبی ارائه شده در این تحقیق، به دلیل توانایی استفاده از متغیرهای بیشتر در مدل‌سازی و نتایج دقیق‌تر، روشی مؤثر برای پیش‌بینی نیروی بیرون‌کشیدگی الیاف از بتن است.
As steel fibers are important reinforcement materials in concrete, in this study, the behavior of hook-shaped steel fibers from concrete is predicted through the use of artificial neural networks. In the absence of comprehensive laboratory data, data obtained from finite element analysis was used for modeling. The simulations are carried out using ABAQUS software's finite element method in 3D. Using the concept of the transition zone of the interface, whose parameters were obtained by inverse finite element analysis and experimental tests conducted on a sample of fibers, this model has been developed to simulate the interaction between fibers and concrete. On the basis of the results of the numerical model validated against the experimental results, the effective parameters of the fibers were extracted, and a neural network was then constructed based on the results. A multilayer forward perceptron artificial neural network and back-propagation training algorithm are used to predict pull-out force, with Marquardt-Lonberg optimization applied. The results demonstrate that the neural network model presented in this research is an effective method for predicting the pull-out force of fibers from concrete, in part because it allows the use of more variables in modeling, as well as delivering more accurate results.
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