This study proposes a numerical separation method to isolate stress-disturbed regions (D-regions) from global models and determine their boundary conditions using a penalty-based iterative algorithm. To enhance practicality, an integrated graphic prog...
This study proposes a numerical separation method to isolate stress-disturbed regions (D-regions) from global models and determine their boundary conditions using a penalty-based iterative algorithm. To enhance practicality, an integrated graphic program was developed to automate this process. The validity of the method was verified through 2D and 3D examples, confirming that the separated D-regions accurately replicate the global model's behavior. Notably, analyses demonstrated that the boundary forces of the separated D-regions strictly satisfy static equilibrium conditions. Furthermore, comparisons between plain (PC) and reinforced concrete (RC) global models revealed no significant differences in member forces within the linear elastic range, suggesting the potential for simplified modeling. In addition, a technique transforming 1D frame forces into equivalent solid boundary stresses was implemented, effectively linking macroscopic global analysis with detailed local design. In conclusion, this study provides a systematic methodology for the analysis of complex D-regions, contributing to improved accuracy and reliability in reinforced concrete structure design.