Development of an excel-based calculation tool for interaction curves of rectangular concrete columns subjected to fire

rectangular concrete columns subjected to both bending and compression in case of fire. First, the proposed framework based on Eurocode 2 is explained and additionally some simplifications are made. As a first step in the verification process, the accuracy of the proposed calculation method is verified, considering traditional analytical calculation methods for interaction curves at ambient temperatures. Subsequently, the performance at elevated temperature is examined in more detail considering a scholar example. The influence on the interaction curves is investigated by taking into account fire exposure of 1, 2, 3 or 4 sides. Finally, interaction curves of columns are developed for different slenderness ratios. Comparing the interaction curves with available research results, the accuracy of this simplified numerical calculation approach is verified