Nonlinear response of steel-fiber reinforced concrete beams under blast loading: Material modeling and simulation

Abstract

Steel fiber reinforced concrete (SFRC) is widely used in the constructional field especially in defense related structures which often subjected to various types of static and dynamic forces. This paper describes the experimental investigation results of SFRC specimens under the effect of compressive and tensile loading. Variables considered are type, aspect ratio and percentage volume of fractions of steel fibers. New mathematical general material constitutive stress-strain relationship for fibrous and conventional concrete were predicted statistically by using SPSS-program, this by basing on the present experimental data. Nonlinear transient dynamic analysis of reinforced concrete beams subjected to blast loading using the finite element method is presented. Eight-node serendipity degenerated plate elements have been used to represent the concrete beam structures. Implicit Newmark with corrector-predictor algorithm is employed for time integration of the equation of the motion. A computer program coded in FORTRAN language is written to implement the present study to give a complete listing of stress and deformation in every concrete or steel layer at any time. The numerical results show good agreement with other published studies' results which include deflections. © Tsinghua University Press, Beijing and Springer-Verlag Berlin Heidelberg 2011.