COMPARATIVE STUDY OF RESPONSE SPECTRUM DESIGN BASED ON TBI GUIDELINES 2017 USING SLE SHAKING AND BASED ON SNI 1726-2019 USING DESIGN EARTHQUAKE WITH MODIFIED CS ON A 69-STORY EARTHQUAKE RESISTANT SUPER TALL BUILDING IN JAKARTA

• Main Author: Abel Irawan, Javaughn
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/66890
• Institution: Institut Teknologi Bandung

Design of super tall buildings using code-prescriptive method based on SNI 1726-2019 shows some limitations. Firstly, super tall structures commonly use special seismic force-resisting structural system not regulated by code to suppress lateral deformation. Secondly, minimum limit of seismic coefficient (Cs,min) is considered too conservative for buildings with long fundamental period, which actual seismic coefficent (Cs,actual) is significantly smaller than Cs,min, resulting in an uneconomical design. These limitations are possible to be overcomed by the use of performance based design (PBD) method. This study is the preliminary step of the entirety of PBD method. In this study, design criteria (stiffness modifier and material properties) and acceptance criteria of code-prescriptive SNI 1726-2019 and TBI Guidelines 2017 will be compared. Furthermore, preliminary design of PBD, which is response spectrum analysis (RSA) using service level earthquake (SLE) shaking, will be compared with RSA based on SNI 1726-2019 with modified Cs. The value of Cs used in this comparison is Cs,average, which is the average value of Cs,min and Cs,actual. Case study is done on a 69-story super tall reinforced concrete building with special shear wall system complemented by steel outrigger and belt truss as the main seismic force-resisting structural system. Advanced study to evaluate design results with non-linear time history analysis using SLE shaking to analyze the service level performance and MCER shaking to prove the building safety and reliability will be done in Master’s Program. Analysis result on a building with fundamental period of 11 seconds shows that the base shear due to SLE shaking based on TBI Guidelines 2017 is around 35% larger than the base shear due to 2/3 MCER scaled to Cs,average. However, significant difference of load combination used for analysis based on TBI Guildelines 2017 compared to SNI 1726-2019 results in a relatively smaller internal forces (roughly 69% to 76%) for gravity load resisting elements, especially in columns. On the other hand, shear wall and coupling beam forces tend to be larger, around 111% to 120%. This shows that the seismic energy dissipation is dominantly handled by the coupled wall system rather than the special moment frame system. Required reinforcing steel design is reduced in beams by around 18%, in columns by around 48%, and in coupling beams by around 35%, while in shear wall it increases by around 12%.