The performance of structures with circular columns and square columns in the structure of Rancacili Silinder II building

In general, structural planning is only limited to count the safety and durability of the building in holding and accommodating the load on the structure, without calculating or determining the performance level of the structure. The structure performance itself is used to determine the performance level of a structure against an earthquake design based on the level of damage to the structure when it is affected by an earthquake with a certain return period. This research was conducted to determine the level of structural performance based on variations in column with a case study of the Rancacili Silinder II building. Structural performance analysis was carried out using three structural models, the structure with a circular column and a square column (Structure type I) according to existing conditions, the structure with a circular column (Structure type II), and the structure with a square column (Structure type III). The structure type I uses the same column dimensions from base floor to the roof, but structure type II and III the column dimensions change smaller from the base floor to the roof. Determination of performance levels based on ATC-40 with seismic load analysis of spectrum response. For force calculations in using ETABS V.16.2.0. The results of this study indicate that the structure type I has the smallest displacement value among the three models, with a displacement value of the X direction at 50, 198 mm. While the structure type II has the smallest displacement value of the Y direction at 46, 995 mm among the three models. The structure performance based on ATC-40 from the three structural models shows that they are at the same level of performance, Immediate occupancy (IO), where after an earthquake there is only a little damage and has the strength and stiffness approximately the same as the pre-earthquake conditions.