The IZ kmax datasets contains all the design information and results of the influence zone evaluation conducted in the Gallet et al. (2024) journal article "Influence zone of continuous beam systems (doi.org/10.1016/j.istruc.2024.107069). The dataset is publicly available on a CC-BY-4.0 licence. In addition to the datasets, a simple python script demonstrating the use of Algorithm 1 and 2 developed in the Gallet et al. (2024) journal article is made available.