Seismic performance analysis of retrofitting building structure with type X bracing

Abstract

The result of the earthquake causes a lateral force that occurs on the building structure. Loads caused by earthquake loads need to be calculated and designed based on standards, so that when an earthquake occurs, the structure of the building is still able to resist the resulting lateral forces. The calculated building structure has a height of 12 floors with structural elements consisting of columns, beams, and shear walls. This building structure is loaded with earthquake loads which refer to SNI 1726-2019 Procedures for Earthquake Resistance Planning for Building and Non-Building Structures. Based on the calculation of the existing building structure due to the earthquake load of SNI 1726-2019, it was found that the story drift and Demand–Capacity Ratio (DCR) in column and beam did not meet the planning standards. The building structure was remodeled using type X bracing retrofitting to determine the value of story drift and DCR. Building structure modeling with type X bracing consists of three model shapes varying the location of placement and the number of type X bracing per floor. The results show that the addition of type X bracing can reduce the story drift up to 32.77% for the x direction and 33.75% for the y direction. In the cross-section of the beam element, the reduction in internal forces can reduce the Demand–Capacity Ratio (DCR) value in the beam. The cross-section of column element, the internal force has decreased but for the column which is attached to the type X bracing system showed an increase in internal force which causes an increase in the DCR value.