مصالح و سازه های بتنی

مصالح و سازه های بتنی

مدلسازی مشخصه و سه بعدی آسیب-شکست الاستوپلاستیک بتن

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشکده فنی مهندسی، گروه مهندسی عمران، دانشگاه خوارزمی، ایران، تهران گروه مهندسی عمران، دانشکده مهندسی دریا، دانشگاه دریانوردی چابهار، ایران
2 گروه عمران دانشکده فنی و مهندسی دانشگاه خوارزمی
3 دانشگاه خوارزمی
چکیده
تعریف یک مدل مشخصه جهت تشریح رفتار مکانیکی مصالح بتنی تحت اثر نیروهای چند محوره بسیار حائز اهمیت می‌باشد. مقاله حاضر یک تابع پتانسیل نوین را با قابلیت استفاده در قانون مشخصه برای گروه وسیعی از مصالح شکل پذیر، ترد و حساس به فشار پیشنهاد می‌دهد. این تابع پتانسیل جدید احتمال تبدیل اغلب فرم های سطح تسلیم مرتبط و موجود برای مصالح نیمه ترد (بتن) و مواد شکل پذیر (فولاد) را فراهم می‌آورد. در این پژوهش، تابع پتانسیل به چندین تابع مرتبط با معیارهای گسیختگی همچون دراکر- پراگر، ترسکا، ترسکا اصلاح شده، موهر کولمب، فون میزس، رانکین و ... تعمیم داده شده است. همچنین تحدب و صافی سطح پلاستیسیته این تابع نیز بررسی می‌شود. در ادامه یک قانون جایگزین آسیب- شکست الاستوپلاستیک سه محوره برای مدلسازی بتن ارائه خواهد شد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Elasto-plastic-damage-Fracture Constitutive Model of Concrete

نویسندگان English

Amanallah Kordi 1
seyed hossein hosseini lavassani 2
Peyman Homami 3
1 Faculty of Engineering, Civil Engineering Department, Kharazmi University, Iran, Tehran Civil Engineering Department, Faculty of Maritime Engineering, Chabahar Maritime University, Chabahar, Iran
2 kharazmi university
3 Kharazmi University
چکیده English

Abstract: It is very important to define a constitutive model in order to describe mechanical behaviors of concrete material under multiaxial forces. This paper proposes a novel potential function which can be used in constitutive law for a wide category of ductile and brittle and pressure-sensitive materials. This novel potential function permits the possibility of transition between most forms of existing associated yield surface of quasi-brittle materials (concrete) and ductile materials (steel). In this research, the potential function is generalized to several associated functions with failure criteria, such as Drucker-Prager, Tresca, Modified Tresca, Mohr-coulomb, Von-Mises, Rankin, and others. Also, the convexity and smoothness of plasticity surface of this function are investigated. Then a tri-axial elasto-plasto-fracture-damage constitutive law for the modeling of concrete is presented.

کلیدواژه‌ها English

Constitutive Law
Potential Function
Elasto-Plastic-Damage-Fracture
Plastic theory
Fracture mechanics
Damage theory
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  • تاریخ دریافت 31 فروردین 1403
  • تاریخ بازنگری 07 تیر 1403
  • تاریخ پذیرش 16 تیر 1403