Comparison of SNI 1726-2012 and RSNI 1726-2018 Against Earthquake Force Plan on Multilevel Structure with Spectrum Response Method

Abstract

Seismic design codes are periodically updated to integrate new seismological data and advanced engineering principles to enhance structural safety. This study presents a direct comparison between the Indonesian seismic codes SNI 1726-2012 and the subsequent draft standard, RSNI 1726-2018. The objective is to quantify the differences in the planned earthquake forces generated by these two standards when applied to a multilevel structure. A case study of a representative reinforced concrete building, assumed to be located in a high seismic-risk zone in Indonesia, is used for the analysis. The Response Spectrum Method is employed to determine the seismic response of the structure under both codes. Key parameters of comparison include the design response spectrum, fundamental period, total design base shear, story shear distribution, and inter-story drift. The results demonstrate a quantifiable difference in the design base shear and spectral accelerations calculated using RSNI 1726-2018, primarily due to the updated seismic hazard maps and risk coefficients. The findings of this research provide critical insights for structural engineers on the design implications of migrating from the 2012 standard to the newer provisions, highlighting the impact on required structural strength and stiffness.