The assessment and strengthening proposal of building structure after the Pidie Jaya earthquake in December 2016

Abstract

A case study of the steel–concrete composite structure in the Pidie Jaya Regency Multipurpose Hall, which experienced substantial permanent lateral deformation due to the effect of an earthquake, is presented in this study. Therefore, it is important to assess the response of the structure to earthquake load and propose strengthening strategies to make the buildings useful again. The purpose was to evaluate the causes of large deformations and the behavior of the structure in resisting earthquake loads. The building structure model used in this study is a space frame with two-column base support conditions, which are fixed and hinged supports, after which a nonlinear time history analysis was conducted. The time history analysis was conducted using five ground motion acceleration data recorded during earthquakes to determine the deformation, and it was found that the large structure’s permanent deformation was due to the small structure stiffness in the direction of the deformation due to the use of only one column row in front of the building. Moreover, hinged support was observed to have caused a greater deformation than fixed support but was found not to be the main cause of large permanent deformation of the structure. The building structure was further strengthened by adding four columns while the oblique columns remained in a sloping condition. Meanwhile, the response spectrum analysis showed the strengthening structure was able to withstand earthquake loads with less deformation than the required standard.