Abstract
A two noded, unidimensional bar element formulated and implemented as a computer program in FORTRAN for elastoplastic Finite Element Analysis best suited for standard type of materials particularly metals was employed in order to find the strain hardening factor for the experimental data of several hundred reinforcement steel bars which were tested in laboratory. Here in the very first instance experimental yield and ultimate values were prescribed as input data and strain-hardening factor was obtained. Direct iterative procedure was adopted and the post yield behaviour of the material was modeled on the basis of a tangent modulus. The study was aimed at finding the suitability of ELPAS as theoretical tool for mathematical modeling of reinforcement bars manufactured from steel scrap. Since a very wide variation of the strain hardening factor values was observed, statistical analysis in terms of mean, standard deviation and coefficient of variation was performed. This was aimed at investigating further the reliability of such bars when used in R.C. structures based on stochastic approach.
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