DESGIN OF DRILLED SHAFT FOUNDATION AND DIAPHRAGM WALL IN MIXED USE CIBADAK BANDUNG

• Main Author: Fakhri Aldin, Muhammad
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/51215
• Institution: Institut Teknologi Bandung

The Mixed Use Cibadak building in Bandung, West Java has a function as a residential and commercial area. This building consists of 2 basement, 4 floors as a podium, and 7 floors as an apartment tower. This building is supported by a diaphragm wall with steel strutting and with a reinforced concrete drill pile foundation Analysis of internal forces and retaining walls along with their support system was carried out using the finite element method with the PLAXIS 2D program (Bentley Systems, 2004) which used a hardening soil soil model. The most extreme lateral deformation was 36.3 mm and the lowest safety figure was 2.06. For this type of soil and the construction method is bottom up, the foundation for reinforced concrete bore piles with a diameter of 800 mm for podium columns and 1000 mm for tower columns. The axial bearing capacity of a single pile is calculated based on Reese & Wright's (1977) approach and the smallest axial bearing capacity is 2400 kN for foundations with a diameter of 800 mm and the largest is 4000 kN for those with a diameter of 1000 mm. The length of the embedded foundation piles is 37.5 m for all foundation diameters starting from below the basement base. Lateral bearing capacity determined by the p-y method using the LPILE software (Ensoft, 2014) with the smallest value of 750 kN and the largest of 2400 kN. The largest calculated land subsidence is 36 mm For the earthquake acceleration used in the analysis of the foundation and retaining walls from SNI 1726: 2019 has a PGA value of 0.511 g and a PGAm of 0.608 g. The reinforcement design uses steel with a yield stress of 420 MPa following SNI 2847: 2019 regulations. There are 19 types of pile cap with a thickness of 800 mm. The length and width varies from 2.4 m to 41.5 m. Each tie beam is designed with a size of 600 x 800 mm.