COMPARATIVE ANALYSIS OF SEISMIC PERFORMANCE BUILDING STRUCTURE OF DUAL SYSTEM REINFORCED CONCRETE PRECAST IN JAKARTA WITH AND WITHOUT BASE ISOLATION SYSTEM

• Main Author: Nifotuho Fau, Martinus
• Format: Theses
• Language: Indonesia
• Subjects: Teknik sipil
• Online Access: https://digilib.itb.ac.id/gdl/view/68396
• Institution: Institut Teknologi Bandung

The development and application of high performance precast structural systems in reinforced concrete buildings by utilizing the formation of plastic hinges to dissipate energy in the structural components themselves, has been widely produced locally in Indonesia. On the other side, new faults continue to be discovered which will have the potential to continue to increase seismicity, as well as the need to obtain better structural seismic performance for high-value buildings. Therefore, the use of a base isolation system is one of the innovations that can improve the performance of precast building structures. This research will focus on the use of Lead Rubber Bearing (LRB) base isolation, and the building model is a reinforced concrete dual system which is a combination of the Special Moment Frames System (SMF) and Special Structural Walls System with 20 floors, located in a high seismicity area, located at Jakarta who have a high sismicity area with a soft soil site class and functions as an apartment so that it is included in the seismic design category D. At the initial stage, the structure is analyzed and designed with a prescriptive-based approach using linear elastic analysis, where the detailed design of each structural element will follow SNI 2847:2019 according to the level of detailing used and the stages of analysis and loading following SNI 1726:2019 for earthquake lateral loading and SNI 1727:2020 for gravity load, both for the fixed base structure and base isolation system structure. In a more detailed analysis, performance-based analysis with Non Linear Time History (NLTH) will be used and the structural responses and performance of the two structural systems will be compared. Structures with and without base isolation were analyzed by NLTH using 11 (eleven) pairs of earthquake recordings that had been scaled to Design Basis Earthquake (DBE) and Maximum Considered Earthquake (MCE) from the response spectra of Jakarta soft soil. For non-linear modeling of structural elements using ASCE 41-17 because it is more conservative. For the structural model with base isolation, 3 (three) models are carried out, namely with nominal properties, upper bound properties and lower bound properties to see the effect of the LRB property modification variant used. The parameters that will be measured in the NLTH analysis are the dynamic characteristics of the structure, the base shear force, the floor shear force, the total displacement, the displacement ratio between floors, the roof drift ratio, the damage to the plastic hinges of the structural elements, the inelastic energy dissipation ratio, and the horizontal deformation of the base isolation of the LRB. The results of the analysis obtained by NLTH analysis are for precast building structures without base isolation at the MCE earthquake level, the performance of the resulting structure is Life Safety (LS), increased to Immediate Occupancy (IO) after using LRB base isolation, and at the DBE earthquake level the performance was obtained. structure without base isolation is Immediate Occupancy (IO), increasing to elastic or operational after the addition of base isolation LRB. As well as, the other parameters experienced a significant reduction because the dominant earthquake energy dissipation was centered on the base isolation element used. So that the combination of the precast structural system with this base isolation will provide an increase in performance results and a significant reduction in response, which means that the damage to the upper structural elements is minimal and can still be repaired after an earthquake occurs, especially the precast connection system used has the advantage of being able to easily and effectively repaired again.