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Fahmi Aldiamar
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Civil Engineering, Building, Construction & Architecture

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ANALISIS DAN EVALUASI FAKTOR AMPLIFIKASI PERCEPATAN PUNCAK GEMPA DI PERMUKAAN TANAH Fahmi Aldiamar; M Ridwan; M. Asrurifak; Masyhur Irsyam
Jurnal Jalan-Jembatan Vol 27 No 3 (2010)
Publisher : Direktorat Bina Teknik Jalan dan Jembatan

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Earthquake resistant infrastructure planning, generally require the acceleration data at ground level. Currently, the American Society of Civil (ASCE) 07-2010 provides amplification factor for earthquake resistant building design needs so that planners can get the acceleration of the surface by multiplying the value of the accelaration of Infonsesian Earthquake Maps 2010 with the amplification factor. To evaluate the amplification facttor with the seismic hazard analysis using software USGS PSHA-07, evaluation using grid analysis in Sumatra was done using variations of shear wave velocity(VS) which represents the ASCE 07-10 sites classification for very dense soil and soft rock (SC), the soil medium (SD) and soft soil (SE). According to the amplification factor comparison between analysis result and the ASCE 07-2010 at two reviewed period (PGA and 0.2 sec), the SC and SD site result show a close amplification factor to ASCE 07-2010. While large deviation occur between analysis and ASCE 07-2010 at SE site and period T = 1sec with VS30 < 175m/sec. The large deviation probably caused by modeling limitation which only can used specified attenuation function that represent fault zone only. To gain the good quality amplification factor, it is advice to do specific dynamic reponse analysis using local soil condition according to ASCE-07-2010 classification. Keyword : Seismic hazard analysis, amplification factor, peak surface acceleration, surface spectrum response.
ANALISIS RESIKO GEMPA DI BATUAN DASAR Fahmi Aldiamar
Jurnal Jalan-Jembatan Vol 26 No 3 (2009)
Publisher : Direktorat Bina Teknik Jalan dan Jembatan

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Seismic hazard map in Indonesian bedrock was part of the Indonesian standart descrebing seisic hazard for Indonesia territory and used as one of significant load in structure design. Recent earthquake with big intensity surely can effect the seismic hazard in Indonesia. Therefore, seismic hazard map in Sumatera, Java-Sumba and Kalimantan was developed as part of seismic hazard analysis in Indonesia using the latest data, 3D seismic source model and PSHA-07-USGS software and publicized in this paper. The seismic hazard analysis was refer to Unified Building Code 97 and represnt the 475 year return period seismic hazard map in Sumatera, Java-Sumba and Kalimantan. The result showed that maximum PGA for Sumatera ranges between 0.02-0.65g, Java-Sumba 0.02-0.65g and Kalimantan 0.005-0.2g. All result showed a larger value than seismic hazard map in the than Indonesian Standard (SNI 03-1726-2002). Comparison with the other studies showed a comparative result only in Sumatera, while in Java-Suma and Kalimantan shown a disagree result. Some factors can affect the result, such as seismic data, seismic source model and attenuation function selection. Keyword : Seismic hazard analysis, seismic hazard map, bedrock, 3D seismic source model, attenuation function selection, seismic data
EVALUASI NUMERIK METODE PENGGALIAN TEROWONGAN CISUMDAWU I Gde Budi Indrawan; Ridwan Umbara; Fahmi Aldiamar
Jurnal Jalan-Jembatan Vol 36 No 1 (2019)
Publisher : Direktorat Bina Teknik Jalan dan Jembatan

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This paper presents results of research works carried out to evaluate the excavation method of the left (west) side of the Cisumdawu Tunnel by a numerical method. Using data obtained from site investigation during design process and face mapping at eight observation points, tunnel excavations by bench cut (multiple), full face with bench cut, and centre diaphragm methods were numerically modelled in two dimension using a finite element method. The numerical modelling results were compared with field measurement results to determine the most suitable excavation method applied in Cisumdawu Tunnel. Results of this research showed that roof displacements induced by the bench cut (multiple) excavation method obtained in the numerical modelling was close to that obtained in the field measurement. The bench cut (multiple) excavation method applied in the field induced lower roof displacement value than the full face with bench cut and centre diaphragm methods. However, the three excavation methods induced roof displacements lower than a 10 cm maximum displacement specified in the JSCE (2007) and roof strength factor > 1.25, indicating stable tunnel condition.
Co-Authors I Gde Budi Indrawan M Ridwan M. Asrurifak Masyhur Irsyam Ridwan Umbara