شبیه سازی عددی عملکرد زنجیری اعضای بتن‌آرمه با میلگردهای فولادی و هیبریدی (ترکیب فولادی و FRP) تحت اثر خرابی پیشرونده

نوع مقاله : پژوهشی اصیل (کامل)

نویسندگان
دانشگاه تبریز
چکیده
در این مقاله با توجه به نقش عملکرد زنجیری اعضای سازه­ای در انتقال بارهای اضافی ناشی از حذف ستون باربر میانی در تغییرشکل­‌های بزرگ برای جلوگیری از وقوع خرابی پیشرونده، روش عددی المان محدود (FEM) سه بعدی (3D) برای شبیه‌سازی این رفتار معرفی می­‌گردد. این روش در عین سادگی، برای پیش‌­بینی پاسخ عناصر بتن‌آرمه­ تا مرحله خرابی نهایی بسیار قابل اعتماد می­‌باشد. برای صحت­‌سنجی مدل عددی از دو سری نمونه که توسط محقیقین قبلی به روش تجربی آزمایش شده­‌اند، استفاده گردیده است. سری اول، زیرمجموعه‌­های تیر-ستون با سناریو حذف ستون میانی، برای مقایسه و نمایش قابلیت مدل عددی در پیش­‌بینی سه سطح از عملکرد شامل مرحله خمشی، قوس فشاری و زنجیری و سری دوم شامل تیرهای بتنی مسلح­‌شده با ترکیب آرماتورهای فولادی و میلگرد­های از جنس الیاف پلیمری تقویت شده (FRP) می­‌باشد. مقایسه نمودار­های بار-تغییرمکان حاصل از داده­‌های تجربی و نتایج عددی برای هر دو سری نمونه، نشان از دقت بالای روش شبیه‌­سازی پیشنهادی دارد. در ادامه تحقیق، بر اساس مدل­‌های عددی صحت­‌سنجی شده، به مطالعه تأثیر میلگردهای FRP در ترکیب با آرماتورهای فولادی بر عملکرد عناصر بتنی تحت خرابی پیش­رونده پرداخته و تأثیر خصوصیات مکانیکی و آرایش مختلف آنها بر مقاومت و شکل­پذیری و رفتار زنجیری بررسی می شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله English

Numerical simulation of catenary action of hybrid FRP RC beam-column subassemblage under progressive collapse

نویسندگان English

ali hadidi
morteza kamalvand
University of tabriz
چکیده English

In this paper, due to the role of the catenary action of the structural members in large deformations and transfer of additional loads due to the middle column removal is important to prevent the catastrophic event of progressive collapse, a simulation method is introduced using 3D numerical finite element method (FEM). This method is simple, reliable and very suitable for predicting the response of RC members to the failure level. For verification of numerical model, two series of specimens tested experimentally by previous researchers have been used. The first series include the beam-column subassemblages under a middle column removal senario for comparing and displaying the numerical modeling capabilities in the prediction of three levels of performance including flexural, compressive arc and catenary action and the second series include a set of concrete beams rienforced with hybrid combinations of steel and fiber Reinforced polymer (FRP) bars. Comparisons between the load-displacement curves obtained from experimental data and numerical results of both series of specimens reveal the high accuracy of the proposed simulation method. In the following of research, based on validated numerical models, the effect of FRP bars in combination with steel reinforcement on the performance of beam-column subassemblages under progressive collapse and the effect of mechanical properties and their arrangement in concrete beams section on the strength and ductility and catenary action are investigated.

کلیدواژه‌ها English

Nonlinear finite element analysis
progressive collapse
RC beam-column subassemblages
FRP bars
Hybrid
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