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RISS 인기검색어
- 검색키워드
- 저자 : Azevedo N.Monteiro (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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A discrete particle model for reinforced concrete fracture analysis
N. Monteiro Azevedo,J.V. Lemos,J.R. Almeida 국제구조공학회 2010 Structural Engineering and Mechanics, An Int'l Jou Vol.36 No.3
The Discrete Element Method adopting particles for the domain discretization has recently been adopted in fracture studies of non-homogeneous continuous media such as concrete and rock. A model is proposed in which the reinforcement is modelled by 1D rigid-spring discrete elements. The rigid bars interact with the rigid circular particles that simulate the concrete through contact interfaces. The DEM enhanced model with reinforcement capabilities is evaluated using three point bending and four point bending tests on reinforced concrete beams without stirrups. Under three point bending, the model is shown to reproduce the expected final crack pattern, the crack propagation and the load displacement diagram. Under four point bending, the model is shown to match the experimental ultimate load, the size effect and the crack propagation and localization.
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Aggregate shape influence on the fracture behaviour of concrete
Azevedo, N.Monteiro,Lemos, J.V. Techno-Press 2006 Structural Engineering and Mechanics, An Int'l Jou Vol.24 No.4
The Discrete Element Method, DEM, is increasingly used in fracture studies of non-homogeneous continuous media, such as rock and concrete. A 2D circular rigid DEM formulation, developed to model concrete, has been adopted. A procedure developed to generate aggregate particles with a given aspect ratio and shape is presented. The aggregate particles are modelled with macroparticles formed by a group of circular particles that behave as a rigid body. Uniaxial tensile and compression tests performed with circular and non-circular aggregates, with a given aspect ratio, have shown similar values of fracture toughness when adopting uniform strength and elastic properties for all the contacts. Non-circular aggregate assemblies are shown to have higher fracture toughness when different strength and elastic properties are set for the matrix and for the aggregate/matrix contacts.
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A discrete particle model for reinforced concrete fracture analysis
Azevedo, N. Monteiro,Lemos, J.V.,Almeida, J.R. Techno-Press 2010 Structural Engineering and Mechanics, An Int'l Jou Vol.36 No.3
The Discrete Element Method adopting particles for the domain discretization has recently been adopted in fracture studies of non-homogeneous continuous media such as concrete and rock. A model is proposed in which the reinforcement is modelled by 1D rigid-spring discrete elements. The rigid bars interact with the rigid circular particles that simulate the concrete through contact interfaces. The DEM enhanced model with reinforcement capabilities is evaluated using three point bending and four point bending tests on reinforced concrete beams without stirrups. Under three point bending, the model is shown to reproduce the expected final crack pattern, the crack propagation and the load displacement diagram. Under four point bending, the model is shown to match the experimental ultimate load, the size effect and the crack propagation and localization.
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