COMPARATIVE STUDY OF REINFORCED CONCRETE SPECIAL MOMENT RESISTING FRAME STRUCTURES BETWEEN TWO STAGE METHOD WITH SOIL STRUCTURE INTERACTION METHOD

• Main Author: Tanuardy, Hendy
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/47067
• Institution: Institut Teknologi Bandung

Nowadays the construction of skyscrapers is a common thing for the community. The skyscraper is usually designed with a lower structure that functions as a parking lot. In Indonesia, the design of skyscrapers usually uses a two-stage analysis where we assume the building structure is fixed on the ground floor. The lower structure model is modeled separately with the condition that there are several consequences that must be met. This method is considered a conservative method. But in order to get closer to the actual structural model, the upper and lower structure models must be modeled together. Modeling by modeling the upper structure and the lower structure together can cause the structure to produce greater lateral displacement and greater periods of vibration. The distribution of earthquake forces that occur will be different. Thus, modeling the upper structure with the lower structure simultaneously is more recommended in designing skyscrapers, but this analysis is constrained because it must consider the effects of soil interaction with the structure around the retaining wall and its location. This method is usually called the Soil Structure Interaction (SSI). Therefore, a study comparing the structure design of two-stage analysis with the SSI method is needed to prove that the two-stage analysis is a more conservative method compared to the Soil Structure Interaction method. The analysis that will be conducted is a nonlinear analysis of the response time of the earthquake representing the city of Jakarta to identify the response that occurred in the structure. Based on the research that has been done, it is obtained the difference in the size of the comparative study of spring values and the damping of SSI modeling. In the non-linear time history analysis SSI modeling influences the response of structures such as drift and maximum drift per floor, but the maximum shear force response of each floor does not appear to have significant effect. So, based on the forces acting on the structure, two-stage analysis can be a conservative method. So that structures that meet the two-stage analysis requirements can be designed with the two-stage analysis without the need for SSI modeling. But the structure still has to be checked again regarding the requirements of the structural deformation, because the maximum deformation of the structure will be enlarged due to modeling SSI. This additional deformation may result in the structure doesn’t meet deformation requirements.