Calculate the load-bearing capacity of reinforced concrete columns with rectangular section by using non-linear material models in TCVN 5574:2018

Abstract

Reinforced concrete columns play an important role to transfer the loads to the building foundation. In the paper, the author programs to calculate the load-bearing capacity of bi-axially loaded members with rectangular sections based on the interaction chart method by using non-linear material models in TCVN 5574:2018. The compressing stresses of concrete are calculated according to the trilinear diagram, and the stresses in reinforcement are determined due to strains according to the bilinear diagram. VBA programming in Excel is used to calculate and represent vertical planes of interactive charts. Some examples are implemented and compared with the data from ETABS version 2019 to evaluate the accuracy of the program.