مطالعه عددی برروی استفاده از بتن پرمقاومت مسلح شده با الیاف در دیوارهای برشی با المان‌های مرزی

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی عمران و محیط زیست، دانشگاه صنعتی امیرکبیر، تهران، ایران

چکیده

از جمله موارد منفی موجود در سازه های بتنی می‌توان به ابعاد بزرگ اعضای بتنی، تراکم زیاد آرماتورها در بعضی مقاطع و رفتار ترد بتن اشاره کرد. استفاده از سنگدانه ریز و نسبت آب به سیمان کم‌تر سبب افزایش مقاومت می‌شود، افزودن الیاف به بتن پرمقاومت  UHPC  باعث افزایش نرمی و مقاومت کششی بتن می‌شود که با عنوان بتن پرمقاومت با الیاف UHPFRC  مطرح می‌شود و می‌توان به مقاومت فشاری تا حدود 200 مگاپاسکال و مقاومت کششی تا حدود 14 مگاپاسکال دست پیدا کرد. در این مقاله ابتدا تکنیکی برای مدلسازی عددی این بتن به کمک نرم‌افزار اجزامحدود LS-DYNA پیشنهاد شده است. در این تکنیک با اصلاح بخش کشش، یک مدل ماده‌ی بتن معمولی به وسیله‌ی روابط حاصل از مطالعات تجربی، امکان مدلسازی عددی بتن UHFRC فراهم شده است. پس از راستی آزمایی مدل ماده بتن اصلاح شده در نرم افزار LS-DYNA، اثرات استفاده از این بتن در رفتار چرخه ای دیوارهای برشی کوتاه و لاغر به کمک مدلسازی عددی بررسی شده است. استفاده از این بتن در اعضای مرزی دیوارها تاثیر بسزایی در بهبود رفتار لرزه ای آن‌ها دارد. در این تحقیق اثرات پارامترهای مختلف بررسی شده و مشاهده شد با افزایش درصد الیاف تا سه درصد، مقاومت جانبی دیوار تا 79% افزایش می‌یابد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Numerical study on Ultra High-Performance Fiber Reinforced concrete for application in shear walls with boundary elements

نویسندگان [English]

  • zeinab nouri
  • Siamak Epackachi
Department of Civil & Environmental Engineering Amirkabir University of Technology (Tehran, Polytechnic)
چکیده [English]

The negative issues of concrete structures include the large dimensions of concrete members due to the low resistance of concrete compared to steel structures, the high density of reinforcements in some parts, and the brittle behavior of concrete due to weakness in tension. The use of fine aggregate and a lower water-to-cement ratio increases the strength, adding fibers to high-strength UHPC concrete increases the softness and tensile strength of concrete, which is called high-strength concrete with UHPFRC fibers with a compressive strength up to 200 MPa and a tensile strength of up to 14 Mpa. In this research, a technique for the numerical modeling of UHPC concrete is proposed using the LS-DYNA finite element software and modifying the tensile part of a normal concrete material model and the available test data. The validated LS-DYNA model is used to study this concrete on the cyclic behavior of short and thin shear walls. The use of this concrete in the boundary element of the walls has a significant effect in improving their seismic behavior. In this research, the effects of different parameters were investigated. It will be shown that an increment in the percentage of fibers up to 3%, the wall's lateral resistance and initial stiffness increase significantly.

کلیدواژه‌ها [English]

  • Ultra High-Performance Concrete
  • Ultra High-Performance Fiber Reinforced Concrete
  • Finite Element Analysis
  • LS-DYNA
  • Cyclic Behavior

مراجع

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نشریه مهندسی عمران امیرکبیر
دوره 56، شماره 11
1403
صفحه 1453-1484

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