ANALISIS DAYA DUKUNG AKSIAL TIANG DIAMETER 60 CM DENGAN MENGGUNAKAN UJI BEBAN STATIK AKSIAL DAN MENGGUNAKAN METODE ELEMEN HINGGA PADA PROYEK GEDUNG RAWAT INAP TOWER-1 RS HAJI MEDAN

Abstract

This study analyzes the axial load capacity and settlement of 60 cm diameter spun piles for the Inpatient Tower-1 Building at Haji Hospital, Medan, using static load tests and finite element modeling (FEM) with PLAXIS 3D. Field data from Standard Penetration Tests (SPT) and cyclic loading tests were compared with numerical simulations employing Mohr-Coulomb and Hardening Soil models. Empirical calculations based on SPT data (O’Neil & Reese method) yielded an ultimate capacity of 204.24 tons, while load test interpretations (Davisson, Mazurkiewicz, and Chin methods) showed higher values (390–476 tons), confirming the conservative nature of SPT-based predictions. The safety factors (2.43–2.97) met ASTM D1143 standards.

PLAXIS 3D simulations accurately replicated field-measured settlements, with a maximum deviation of <5%. The Hardening Soil model provided better agreement with load test results (6.66 mm settlement at 320 tons) by accounting for soil nonlinearity. Elastic settlement calculations (2.1 mm for single piles; 5.9 mm for pile groups) remained within permissible limits (25 mm).

Recommendations include optimizing pile length based on SPT stratigraphy and adopting Hardening Soil models for projects with cyclic loads. This integrated approach enhances cost-effective and safe deep foundation design for high-rise structures in urban areas with limited land availability.