TY - JOUR N2 - The paper deals with the variability of mechanical properties of EPSTAL steel rods produced in Polish steelworks, i.e. yield stress Re, tensile strength Rm, and elongation Agt. Our study is based on fundamental engineering static room-temperature tensile tests for large series specimens which have been made by manufacturers as the part of a factory quality control. Statistical analysis of these results shows that the stressstrain relationship of steel tensile tests should be described by a one-dimensional stochastic process, and three the most important mechanical parameters, i.e. the yield stress, tensile strength, and elongation by random variables. Based on the statistical elaboration of experimental data, it was found that the yield stress and tensile strength of steel rods produced in the years 2016-2017 had the coefficients of variation of less than 3%, and there is a reasonable basis for the manufacturer to increase the characteristic value of EPSTAL steel rods yield stress by a few percentages. L1 - http://journals.pan.pl/Content/115675/PDF/02_ace-2019-0031.pdf L2 - http://journals.pan.pl/Content/115675 PY - 2019 IS - No 3 EP - 30 KW - EPSTAL steel bars KW - yield stress KW - tensile strength KW - elongation KW - random variables KW - histograms KW - main descriptors of a random variable A1 - Chmielewski, T. A1 - Piotrowska, M. PB - WARSAW UNIVERSITY OF TECHNOLOGY FACULTY OF CIVIL ENGINEERING and COMMITTEE FOR CIVIL ENGINEERING POLISH ACADEMY OF SCIENCES VL - Vol. 65 DA - 30.09.2019 T1 - Investigation of the variability of EPSTAL steel strength parameters SP - 15 UR - http://journals.pan.pl/dlibra/publication/edition/115675 T2 - Archives of Civil Engineering ER -