| dc.description.abstract | The foundation serves as the crucial support structure for a building,
bearing the weight of the structure above. In the construction of the
Pegadaian Tower Building on Jalan Kramat Raya, Central Jakarta, drilled
pile foundations with a 1.0 m diameter and a length of 39 m were utilized.
This study aims to reassess the design of these drilled pile foundations by
considering variations in diameter to investigate their impact on loadbearing capacity and settlement. Four diameter variations, namely 0.7 m,
0.8 m, 0.9 m, and 1.0 m, were evaluated, all with a consistent pile length of
39 m. Data from the Detail Engineering Design (DED), Standard
Penetration Test (SPT), and existing foundation information were employed
for analysis. Structural analysis was conducted using SAP2000 version 14.
The support capacity of the drilled pile foundations was assessed using the
Skempton and Tomlinson methods, while the Meyerhoff and Tomlinson
methods were applied for pile foundations. Reduction calculations for
single piles were performed using the Poulus and Davis method, and for
pile groups, the Vesic and 2:1 Spread methods were utilized. The analysis
identified the 1.0 m diameter option, calculated using the Tomlinson
method, as the most suitable. This configuration consisted of five piles
within a group, providing a total support capacity (Qg) of 12554.91 kN,
exceeding the axial load (P) of 11436.13 kN. Settlement analysis revealed a
decrease of 25.57 cm, which, upon recalculating the pile length to 42 m and
distance using the formula 2.5D + 0.02L, resulted in a settlement of 13.89
cm—below the permissible limit of 15.17 cm. Thus, the foundation's
capacity and settlement meet safety requirements, confirming its viability
for use. | en_US |
