Numerical simulation of the structural behaviour of SFRC slabs with or without rebar and prestressing

作者：Goedde Lars; Mark Peter^*

来源：Materials and Structures, 2015, 48(6): 1689-1701.

DOI：10.1617/s11527-014-0265-z

• Slab structures
• Steel fibre reinforced concrete
• Rebar
• Prestressing
• Numerical simulation
• Finite element method

A parametric finite element (FE) model of layered shells is developed to investigate large-sized steel fibre reinforced concrete (SFRC) slabs or shell structures. It accounts for variability in the most sensitive parameters like geometry, discretisation, loading and material properties. Additional reinforcement by means of rebar and prestressing tendons is considered by embedded 3D truss elements as well as deviation and anchorage forces. The material model for plain concrete, formulated in the framework of an elasto-plastic damage theory considering smeared cracks, is elaborated in its material equations and parameters to widen its field of application to SFRC. Plastic strains and stiffness degradation model the damage induced by cracking. Mesh sensitivities due to localisation phenomena are minimised employing a two-step regularisation strategy. First, energy criteria in tensile and compressive domains and corresponding analytically derived characteristic length parameters are defined based on the balance of energies in the crack band. Second, the mesh pattern is initially aligned with respect to supposed crack lines to simplify the analytical procedure. The FE model is applied to loading tests of SFRC slabs on pile supports with and without rebar and prestressing tendons. Comparisons of numerical results in terms of load-deflection curves, reaction forces as well as crack patterns proof a good accordance to experimental data. Effects of unavoidable uncertainties when determining parameters from test reports are illustrated in parametric studies.

• 出版日期2015-6