Discrete meso-modeling of steel fiber reinforced concrete: simultation of flexural behavior
Document typeConference report
Rights accessOpen Access
Concrete provides with a variety of innovative designs, but two characteristics have limited its use: it is brittle and weak under tension. One way to overcome this problem is to add steel ﬁbers into the concrete matrix, a technique introduced in the 70’s called Steel Fiber Reinforced Concrete (SFRC). Fibers shape, length and slenderness characterize its behavior. It is also necessary to take into account the orientation and the distribution of the ﬁbers in the concrete matrix. Diﬀerent ﬂexural tests are reproduced considering SFRC in order to characterize and analyze the inﬂuence of the ﬁbers. In the present work, a numerical tool for including ﬁbers into plain concrete is presented. The numerical approach considered is based on the idea of the Immersed Boundary (IB) methods which were designed for solving problems of a solid structure immersed on a ﬂuid. Herein, the IB method is applied for SFRC considering the concrete accounting for ﬂuid and the steel ﬁbers playing the role of the solid structure. Thus, the philosophy of the IB methodology is used to couple the behavior of the two systems, the concrete bulk and the ﬁber cloud, precluding the need of matching ﬁnite element meshes. Note that, considering the diﬀerent size scales and the intricate geometry of the ﬁber cloud, the conformal matching of the meshes would be a restriction resulting in a practically unaﬀordable mesh. Concrete is modeled considering a nonlinear model and to take into account the whole process between ﬁbers and concrete, the constitutive equations of the ﬁbers are based on analytical expressions available in the literature describing the pullout test behavior. The constitutive expressions depend on (1) the angle between each ﬁber and the crack of the concrete specimen and (2) the shape of the ﬁber.
CitationPros, A.; Díez, P.; Molins i Borrell, C. Discrete meso-modeling of steel fiber reinforced concrete: simultation of flexural behavior. A: COMPLAS XI. "COMPLAS XI : proceedings of the XI International Conference on Computational Plasticity : fundamentals and applications". CIMNE, 2011, p. 944-951.
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