The influence of tie beams on the reinforced concrete frame structural model

Abstract

DOI: https://doi.org/10.66195/mtu.2025.15.079

The separation of “tie” beams from the frame model for independent calculation is commonly applied in reinforced concrete (RC) structural design coursework and even in graduation projects for civil engineering students. However, this approach does not accurately reflect the actual structural behavior of the building. The author recognizes that the impact of tie beams on the RC frame structure can be analyzed through three different models: (1) considering tie beams as simply supported beams and analyzing them separately, (2) modeling them as fixed-end beams, (3) integrating tie beams into the RC frame model for simultaneous analysis. This study employs Etabs and NConc (developed by NCal Solution) to perform structural analysis, reinforcement design, and result evaluation. From this analysis, the study aims to assess the appropriateness of modeling tie beams as part of the RC frame structure, ensuring consistency with both structural design calculations and actual construction practices where tie beams are present.