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All Journal Indonesian Journal of Geography MEDIA KOMUNIKASI TEKNIK SIPIL Journal of Engineering and Technological Sciences Journal of Engineering and Technological Sciences
Muhammad Asrurifak, Muhammad
Geotechnical Engineering Research Group, Faculty of Civil and Environmental Engineering - Institut Teknologi Bandung
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Electrical & Electronics Engineering Engineering

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Development of Risk Coefficient for Input to New Indonesian Seismic Building Codes Sengara, I Wayan; Sidhi, Indra Djati; Mulia, Andri; Asrurifak, Muhammad; Hutabarat, Daniel
Journal of Engineering and Technological Sciences Vol 48, No 1 (2016)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (422.08 KB) | DOI: 10.5614/j.eng.technol.sci.2016.48.1.5

Abstract

In 2010 a national team (Team 9) developed the hazard curve and maximum considered earthquake (MCE) for the whole Indonesian area. The results were further applied in this study. Risk-targeted ground motions (RTGM) with 1% probability of building collapse in 50 years were developed by integrating the hazard curve with the structural capacity distribution. Parametric study on various variables that affect the log-normal standard deviation suggests a value of 0.7. In the effort to obtain the RTGM for the whole Indonesian region, integration was carried out using definite integration in which the curves are split into thin vertical strips and the areas below each curve are multiplied and summed. Detailed procedures and verification are given in this paper. An example of RTGM calculation was carried out for Jakarta City and then applied to the whole Indonesian region. Risk coefficients defining the ratio between RTGM and MCE were eventually developed and mapped. Risk coefficient development was generated for two periods of interest, i.e. a short time period (T = 0.2 seconds) and a 1-second period, respectively. Based on the results, for the period of 1.0 seconds 55% of Indonesian cities/districts have a risk coefficient in the range of 0.9 to 1.1 and about 37% in the range of 0.7 to 0.9, with only 5% in the range of 1.1 to 1.25.
Kajian Pemilihan Koefisien Situs pada Perhitungan Spektra Percepatan Gerakan Tanah di Permukaan Partono, Windu; Irsyam, Masyhur; Sengara, I Wayan; Asrurifak, Muhammad
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 25, Nomor 1, JULI 2019
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (739.358 KB) | DOI: 10.14710/mkts.v25i1.22962

Abstract

SNI 1726:2012 states that surface spectral accelerations SMS (0.2 second) and SM1 (1 second) can be calculated by multiplying site factors Fa (0.2 second) and Fv (1 second) with spectral accelerations SS (0.2 second) dan S1 (1 second). All site factors used by SNI 1726:2012 are adopted from ASCE/SEI 7-10.  In 2013 Stewart and Seyhan proposed new and different site factors compared to ASCE/SEI 7-10. These site factors are then used for developing ASCE/SEI 7-16 with minor improvement for site class SE (soft soil). ASCE/SEI 7-16 states that the site factors for site class SE with SS greater than 1g or S1 greater than 0.2g, shall be calculated using Site Specific Analysis (SSA). The SSA method used for calculating site factor is difficult for ASCE/SEI 7-16 to be implemented in Indonesia. This paper describes the result of SMS and SM1 study at five cities (Jakarta, Bandung, Semarang, Yogyakarta and Surabaya) for site class SC, SD and SE using site factors proposed by Stewart and Seyhan and site factor SNI 1726:2012. The SMS and SM1 at five cities calculated using site factors proposed by Stewart and Seyhan are ±15% differences compared to SMS and SM1 calculated usingSNI 1726:2012 site factors.
Fully Automated Ground Motion Selection Platform Considering Multiple Seismic Source Contributions for Seismic Evaluation of Existing Buildings in Indonesia Alexander, Nick; Irsyam, Masyhur; Asrurifak, Muhammad; Hendriyawan, Hendriyawan; Faizal, Lutfi
Journal of Engineering and Technological Sciences Vol. 57 No. 3 (2025): Vol. 57 No. 3 (2025): June
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.3.5

Abstract

Buildings throughout Indonesia are at risk of experiencing damaging earthquake events from multiple sources within shallow crustal and subduction zones. Seismic assessments per SNI 9273: 2024 require earthquake acceleration time series, but a public web-based platform that can facilitate this need was not yet available. Thereby, it became urgent to investigate the possibility of developing an automated engineering tool that can determine hazard-consistent ground motion set with good target-match accuracy for regions where multiple seismic source contribution is prevalent. The investigation was conducted through the development of a fully-automated ground motion selection and scaling platform specifically customized to facilitate the seismic evaluation and retrofit of existing buildings throughout Indonesia, limited to upper bound period range of 3 s. This platform has been officially launched for public access by the Indonesian Ministry of Public Works to enhance the efficiency and accuracy of seismic assessments with the broader goal of improving seismic safety. Completion and test case validation of the platform confirmed that such useful tool can be developed provided that the following key features are incorporated: (1) specifically-defined scope of application; (2) comprehensive data integration to consider multiple seismic source contribution; and (3) modified greedy selection algorithm to enhance target-match accuracy
Seismic Vulnerability of Semarang, Indonesia for Shallow Crustal Fault Earthquake Partono, Windu; Irsyam, Masyhur; Asrurifak, Muhammad; Sari, Undayani Cita; Victor, Victor
Indonesian Journal of Geography Vol 57, No 1 (2025): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.95057

Abstract

In 2017, the National Centre for Earthquake Studies of Indonesia released the distribution of 25 shallow crustal fault lines throughout the island of Java in Indonesia and four of them (Semarang, Demak, Rawapening and Weleri fault lines) are located around the city of Semarang. The presence of four shallow crustal fault earthquake sources, has led to the need to understand the potential earthquake hazards of Semarang through the development of earthquake-microzoning maps. Earthquake-microzoning maps of Semarang should be developed with reference to the Indonesian earthquake hazard maps and based on the deterministic and probabilistic seismic hazard approaches. Through the development of earthquake-microzoning maps, it is possible to estimate the areas with the highest and lowest surface-shaking (peak ground acceleration). The earthquake-microzoning maps based on the Semarang and Demak fault earthquake scenarios provide a preliminary indication that buildings constructed using the Indonesian Seismic Code (SNI 1726:2002) will experience stronger surface-shaking if the earthquake magnitude from both sources is at least M5.5. The results of the analysis for the creation of earthquake-microzoning maps based on the Rawapening and Weleri fault earthquake scenarios provide a preliminary indication that buildings constructed using SNI 1726:2002 are expected to experience slightly weaker ground-shaking if the earthquake magnitude from both sources reaches a maximum of M6.5. All buildings constructed in this area using SNI 1726:2012 and SNI 1726:2019 are expected to experience weaker surface-shaking due to the four earthquake source scenarios with a maximum magnitude of M6.5.
Co-Authors Alexander, Nick Andri Mulia, Andri Daniel Hutabarat, Daniel Faizal, Lutfi Hendriyawan Hendriyawan I Wayan Sengara, I Wayan Indra Djati Sidhi, Indra Djati Masyhur Irsyam Undayani Cita Sari Victor Victor Windu Partono