Comparative Seismic Performance Analysis of a 30-Story Building Structure with CFST Columns Using Concentrically Braced Frame and Moment Resisting Frame Systems

In earthquake-prone areas, the design of high-rise buildings must be carefully considered. Two of the most common systems used are the Moment Resisting Frame (MRF) and the Concentrically Braced Frame (CBF). The MRF system is the most common for multi-story buildings, where the entire load transfer is handled by the structure without lateral bracing. In contrast, the CBF system is considered better at withstanding seismic (earthquake) forces in high-rise applications. CBF consists of a series of beams and columns reinforced with concentrically placed bracing elements, which can resist lateral loads through axial action on the bracing elements. In the CBF system, the force centers of the bracing elements meet at a single point, ensuring efficient load distribution and predictable structural behavior. Additionally, using Concrete Filled Steel Tubular (CFST) as columns for high-rise buildings is very effective in resisting earthquake forces. This research modeled a 30-story 3D building structure. The slab structure used reinforced concrete elements with a quality of 40 MPa, the beams used Wide Flange (WF) sections, and the columns were Concrete Filled Steel Tubular (CFST) elements. The results showed that the CBF system is more effective in terms of serviceability. The structural mass of the CBF system is lower than that of the MRF, and the displacement and story drift in the CBF system have smaller values. This means the BF system is better at withstanding earthquake forces.