Abstract
Indonesia has followed development of new seismic design criteria in the new seismic building codes, from hazard-based in the former SNI-03-1726-2002 to the current risk-based SNI-1726-2012. The major changes in SNI-1726-2012 are using Risk-Targeted Maximum Considered Earthquake (MCER) Spectral Response Acceleration maps. Five years later (2017), the seismic hazard maps have been updated adopting the most recent data and current state of knowledge in probabilistic and deterministic seismic hazard assessment methodologies. To establish the New 2019 Risk Targeted Ground Motion (RTGM) of spectral acceleration (Ss and S1), and risk coefficients (CRS and CR1), for both short (T=0.2s) and 1-second (T=1s) periods, respectively have been developed based on the 2017 Indonesian hazard maps. The RTGM was calculated as the spectral value resulting in 1% probability of building collapse in 50 years through numerical integration of hazard curves and structural capacity. The log-normal standard deviation (?) of the structural capacity envelope has been revised from 0.70 to 0.65. This paper presents the new resulted RTGM maps. Furthermore, the paper also presents revision of seismic amplification factors for 0, 0.2, and 1 second periods (FPGA, Fa, and, Fv) to generate ground surface maximum and design spectra associated with the siteclassifications.
Highlights
Many areas in Indonesia are highly potential to seismic hazards as it is located within the convergence of four tectonic plates: Eurasian, Indian-Australian, Pacific and the Philippine plates
The new 2017 Indonesian seismic hazard map has been revised with the major changes on the revised active fault database including the addition of newly identified active faults, revisions of the locations of previously known active fault traces, as well as improved estimates of maximum magnitudes and slip rates
The significant changes in the new Indonesian Maximum Considered Earthquake (MCER) maps is the determination of the log-normal-standard-deviation (β) and directivity factors
Summary
Many areas in Indonesia are highly potential to seismic hazards as it is located within the convergence of four tectonic plates: Eurasian, Indian-Australian, Pacific and the Philippine plates. A method, which determine the risk has been used by implementing direct integral to calculate risk-targeted ground motions (RTGM) of 1% probability of building collapse in 50 years that is derived by integrating 2% PE in 50 years hazard curves of the New 2010 Indonesian seismic hazard with fragility curve of Indonesian buildings defined to have 10% probability of collapse This follow the seismic design criteria developed for United States of America by Luco et al (2007), that has been adopted in ASCE-SEI-7-10. New information regarding the identification of active faults with a significant number The information covers both active faults that have not been appropriately quantified during the preparation of the 2010 Indonesia Earthquake Hazard Map and new active faults that are quantified better based on field research through trenching, carbon dating, epicenter relocation, and strain analysis with geodetic data. In order to find out the effect of the enhancement, this paper tend to present the comparison of design spectra, ground amplification, RTGM and risk coefficient between SNI-1726-2012 and proposed SNI-1726-2019 at several cities in Indonesia
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