Issue 39

J. Navrátil et alii, Frattura ed Integrità Strutturale, 39 (2017) 72-87; DOI: 10.3221/IGF-ESIS.39.09 72 Focussed on Modelling in Mechanics Nonlinear analysis of reinforced and composite columns in fire Jaroslav Navrátil, Michal Číhal IDEA RS Ltd navratil@idea-rs.com , http://www.idea-rs.com cihal@idea-rs.com, http://www.idea-rs.com Jaromír Kabeláč Hypatia Solutions Ltd jaromir.kabelac@hypatiasolutions.com Radek Štefan Czech Technical University in Prague radek.stefan@fsv.cvut.cz , https://www.cvut.cz/en A BSTRACT . The paper describes a customer project, the objective of which was to develop a software program for the calculation of reinforced concrete and steel/concrete composite columns subjected to various loadings and exposed to normal temperature or to fire conditions. Such analysis required the use of two Finite Element calculation cores (i) for thermal analysis and (ii) for geometrical and material non-linearity. Calculation cores were connected to graphical user interface via open interface – IDEA Open Model. K EYWORDS . Column; Concrete; Composite; Analysis; Non-linear; Fire. Citation: Navrátil, J., Číhal, M., Kabeláč, J., Štefan, R., Nonlinear analysis of reinforced and composite columns in fire, Frattura ed Integrità Strutturale, 39 (2017) 72-87. Received: 17.07.2016 Accepted: 21.09.2016 Published: 01.01.2017 Copyright: © 2017 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. I NTRODUCTION o single software tool exists so far for complete design of prefabricated concrete and prestressed concrete members. Specialized programs are currently used in combination with Excel design sheets. Due to the absence or unreliability of the links between the programs, the workflow is interrupted and manual data transfer is needed at the interfaces. This system is ineffective and highly vulnerable. That is why producers of prefabricated beams and columns tend to improve their pre-manufacturing processing and member design. Usually they prefer their own software tools customized for their specifics in the types of members, production, logistical and administrative processing. At the same time the pressure on cost-effectiveness of the structures is growing, and the tolerance for structural defects is zero. Therefore they need to improve the economy and the effectiveness of the design by using highly sophisticated analysis methods, which they cannot develop on their own. N