PERFORMANCE EVALUATION OF RACKING DEFORMATION DETERMINATION METHODS FOR UNDERGROUND STATION IN JAKARTA

• Main Author: Maqfirah Fitrah, Andi
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/76914
• Institution: Institut Teknologi Bandung

The rapid development of infrastructure in Jakarta has led to a significant reduction in available aboveground space. Therefore, one solution to this issue has been the increasing development of underground structures in recent years, including the construction of the Jakarta MRT Station. The assessment of structural deformation due to earthquakes becomes crucial in evaluating the stability and safety of the underground structures. Hence, this study aims to evaluate the performance of various methods in determining the deformation of underground structures, also referred to as "Racking deformation," which involves lateral displacement of structural elements in structures with rectangular cross-sections. In this study, three different methods are compared to evaluate the racking deformation of the underground stations in the Jakarta MRT station. The methods include the simplified frame method and Two-dimensional (2D) finite element method for Pseudo-static analysis and Dynamic analysis to conduct a more comprehensive evaluation. Performance indicators such as the magnitude of deformation and bending moment are considered for the evaluation. The results indicate that the dynamic analysis yields the most conservative racking deformation, while the simplified frame analysis and Pseudo-static analysis consistently produce similar racking deformation values. Additionally, in terms of bending moment, the simplified frame analysis generally generates the highest values, but the differences in bending moment values between the Pseudo-static and Dynamic analyses are relatively significant. Overall, the results of the study show that in the analysis of racking deformation of underground structures, especially for complex soil-structure configurations such as the Jakarta MRT station, it is necessary to consider a method that can predict the deformation behavior of structures in a more representative, as conducted in dynamic analysis. This study recommends the utilization of dynamic analysis as verification for pseudo-static analysis under similar geometry structures and soil conditions."