Technical Report: Implementation of SNI 1726:2019, SNI 2847:2019, and SNI 1727:2020 in the Seismic and Structural Design of a 10‑Story Reinforced Concrete Hospital in Palu, Central Sulawesi: Site‑Specific CPT‑Based Geotechnical Characterization, ETABS Res

Abstract

The structural engineering of critical healthcare infrastructure within high-seismicity zones demands a rigorous synthesis of advanced geotechnical investigation, dynamic analysis, and resilient detailing. This technical report presents the comprehensive design and analytical verification of the "Catenary Hospital," a ten-story reinforced concrete facility situated in the immediate vicinity of the Palu-Koro Fault in Palu, Central Sulawesi. Driven by the imperative to ensure operational continuity following the devastating geological events of 2018, this study systematically implements the latest Indonesian National Standards, specifically aligning with the seismic provisions of SNI 1726:2019, the concrete detailing requirements of SNI 2847:2019, and the minimum loading criteria of SNI 1727:2020. The primary objective is to demonstrate a robust structural performance that transcends mere life safety, aiming for immediate occupancy standards required for emergency response facilities.

The engineering process commences with a site-specific geotechnical characterization, a critical step given the complex subsurface conditions of the Palu basin. Utilizing mechanical Cone Penetration Test (CPT) data in accordance with SNI 8299:2017, the study derives precise soil stratigraphy and mechanical properties. This in-situ data facilitates the accurate classification of the site class, which serves as the fundamental baseline for determining the spectral acceleration parameters (S_DS and S_D1) and constructing the Design Response Spectrum. By eschewing generalized assumptions in favor of site-specific CPT correlation, the report ensures that the input ground motions used in the analysis reflect the actual seismic demand expected at the foundation level, thereby mitigating the risks associated with soil amplification and potential liquefaction.

Building upon this geotechnical foundation, the structural analysis employs a three-dimensional finite element model developed within ETABS. The lateral force-resisting system is designed as a Dual System, integrating Special Moment Resisting Frames (SMRF) with Special Reinforced Concrete Structural Walls (Shear Walls). This configuration is selected to optimize stiffness and energy dissipation. The analysis utilizes the Response Spectrum Method to evaluate the dynamic behavior of the structure under design earthquake loads. A focal point of this evaluation is the validation of the Dual System criteria mandated by SNI 1726:2019, confirming that the moment frames are capable of independently resisting at least 25% of the design base shear. This redundancy is vital for preventing catastrophic collapse and ensuring a distributed yielding mechanism during maximum considered earthquake (MCE) events.

The final phase of the report details the component design and serviceability checks. Adhering to SNI 2847:2019, the reinforcement detailing prioritizes ductility, particularly through stringent confinement in the plastic hinge zones of beams, columns, and shear wall boundaries. The study meticulously verifies that the structural members possess sufficient strength to resist factored loads combinations including gravity, seismic, and P-Delta effects. Furthermore, serviceability is confirmed through rigorous inter-story drift analysis, ensuring that lateral displacements remain within the strict limits necessary to protect non-structural components and sensitive medical equipment. In conclusion, this report establishes that the proposed design of the Catenary Hospital not only strictly adheres to the current SNI regulatory framework but also provides a high degree of confidence in the building’s capacity to withstand the formidable seismic hazards inherent to Central Sulawesi.