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Browsing by Author "Tabbara, Mazen"

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Browsing by Author "Tabbara, Mazen"

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  • Tabbara, Mazen; Bazant, Zdenek P.; Prat, PereE C. (2016-02-10)
    Mode III (antiplane) shear fracture energies of concrete and mortar were measured on the basis of the size-effect law. The specimens were cylinders with a circumferential notch at midlength, subjected to pure torsion at ...
  • Tabbara, Mazen; Warren, T.L. (2016-02-10)
    A general method to calculate the tangential stiffness matrix of a structure with a system of interacting propagating cracks is presented. With the help of this matrix, the conditions of bifurcation, stability of state and ...
  • Pijaudier‐Cabot, Gilles; Bazant, Zdenek P.; Tabbara, Mazen (2016-02-10)
    This paper presents a comparison of various models for strain‐softening due to damage such as cracking or void growth, as proposed recently in the literature. Continuum‐based models expressed in terms of softening stress—strain ...
  • Tabbara, Mazen; Stone, C.M. (2016-02-10)
    A direct method for solving quasi-static, mixed-mode fracture problems is presented. The element-free Galerkin method is used in order to allow for crack growth without remeshing. An expression for the normalized, critical ...
  • Chatila, Jean; Tabbara, Mazen (2016-02-03)
    This paper presents an investigation into the hydraulics of regular ogee-profile spillways. The free-surfaces of the fluid for several flow heads as measured in the hydraulics laboratory are used as benchmarks. The finite ...
  • Tabbara, Mazen; Chatila, Jean; Awwad, Rita (2016-02-03)
    Numerical simulations of water flow over stepped spillways with different step configurations are presented. The finite element computational fluid dynamics module of the ADINA software was used to predict the main ...
  • Tabbara, Mazen; Karam, Gebran (2016-02-10)
    An innovative mechanistic based method for passive confinement efficiency estimation is proposed based on the extension to rectangular sections of the pulley model previously proposed by the writers. A refined finite element ...
  • Tabbara, Mazen; Karam, Gebran (2016-02-10)
    An experimental investigation of the corner sharpness effect in square columns with carbon fibre-reinforced polymer (CFRP) wraps is presented using traditional compressive testing of short square columns as well as an ...
  • Belytschko, T.; Tabbara, Mazen (2016-02-10)
    The element-free Galerkin method for dynamic crack propagation is described and applied to several problems. This method is a gridless method, which facilitates the modelling of growing crack problems because it does not ...
  • Belytschko, T.; Lu, Y.Y.; Tabbara, Mazen (2016-02-10)
    Element-free Galerkin method (EFG) is extended to dynamic problems. EFG method, which is based on moving least square interpolants (MLS), requires only nodal data; no element connectivity is needed. This makes the method ...
  • Tabbara, Mazen; Blacker, Ted; Belytschko, Ted (2016-02-10)
    A simple, accurate technique for recovery of displcements and derivatives, such as strains is presented. The technique is based on local interpolation of nodal displacements using a moving least square method. The strains ...
  • Tabbara, Mazen (Northwestern University, )
    The principal object of investigation is the behavior of structures with softening load-displacement curves. The study deals with three interrelated areas: (1) a model for fracture of aggregate composites, (2) stability ...
  • Tabbara, Mazen; Belytschko, T. (2016-02-08)
    H-adaptive procedures for the finite element solution of transient solid mechanics problems are studied, with particular emphasis on problems involving localization due to material instability. Various types of error ...
  • Tabbara, Mazen; Karam, Gebran (2016-02-10)
    The application of the Hoek–Brown empirical strength criterion to actively confined concrete is investigated. A large database of experimental results on hydraulically and triaxially confined concrete is reviewed and ...
  • Zdenek, P.; Bazant, Luigi Cedolin; Tabbara, Mazen (2016-02-08)
    This paper presents a simple new method to calculate column-interaction diagrams, which takes into account slenderness effects. The method consists of a simple incremental-loading algorithm that traces the load-deflection ...
  • Warren, Thomas; Tabbara, Mazen (2016-02-10)
    In certain penetration events it is proposed that the primary mode of deformation of the target can be approximated by known analytical expressions. In the context of an analysis code, this approximation eliminates the ...