The integration of calculation modules and information modelling (BIM) represents a contemporary trend in the digitalisation of design processes within the construction industry. At present, there is a lack of solutions providing a comprehensive exchange of engineering data between the BIM model and calculation modules without using intermediate converters or manual input. Purpose: The experimental verification of the possibility of unilateral integration of a digital information model (DIM) built in the nanoCAD BIM Construction environment with the Limit State Diagrams calculation web application was conducted based on the external data source in Excel format. Methods: Engineering modelling, parameterization of a reinforced concrete structural element, data structuring using spreadsheet formats, automated data transfer between systems, and comparative and visual analysis to assess the accuracy and robustness of the results. The approach is based on format compatibility principles eschewing the use of custom APIs or external scripts. Results: The transfer of geometric, material, and reinforcement parameters from the BIM model to the analytical module has been demonstrated to ensure complete reproducibility of the calculated diagram, eliminate common input errors, and reduce the time required for data preparation by twofold compared to manual entry. The practical significance: The integration of the proposed approach into physical design processes and its potential for organising bilateral data exchange between BIM models and calculation modules within the framework of building structure digital twins have been demonstrated.