PERENCANAAN PONDASI TELAPAK PADA GEDUNG ELECTRICAL CONTROL ROOM PLTP BLAWAN IJEN

The design of spread footings was carried out for the Electrical Control Room Building of the PLTP Blawan Ijen project with the aim of analyzing soil bearing capacity, evaluating bearing stress and settlement, and designing reinforcement requirements for the substructure according to applicable standards. Load data were obtained from ETABS analysis, with a maximum axial force of 491.02 kN and moments Mx = 17.71 kNm and My = 18.64 kNm. The foundation was planned as a square footing with dimensions of 1.65 m × 1.65 m, thickness of 0.60 m, and depth of 1.20 m. Using the Terzaghi method, the allowable bearing capacity was 180.38 kN/m² with a safety factor of 6.291, while the Meyerhof method yielded 180.36 kN/m² with a safety factor of 3.609, both meeting the design criteria. Maximum and minimum soil pressures of qmax = 177,67 kN/m² and qmin = 131.80 kN/m² were considered safe, with no tensile stress occurring. One-way and two-way shear evaluations also indicated safe conditions. The total settlement was 7.23 cm, which is less than the allowable limit of 15.275 cm and therefore acceptable. The footing slab was reinforced with D13-200 mm in both directions, the tie beam TB1 was designed with 3D16 top bars, 2D16 bottom bars, and D13-200 mm stirrups, while column C1 used 12D19 longitudinal bars, D13-100 mm stirrups, and 4 D13 cross ties. The evaluation results confirmed that all foundation components comply with technical requirements and are deemed structurally feasible based on SNI 2847:2019.