Masyhur Irsyam
Departement of Civil Engineering, Institute of Technology Bandung, Jl. Ganesa 10 Bandung, Indonesia.

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PENGUJIAN SKALA PENUH DAN ANALISIS PERKUATAN CERUCUK MATRAS BAMBU UNTUK TIMBUNAN BADAN JALAN DI ATAS TANAH LUNAK DI LOKASI TAMBAK OSO, SURABAYA Irsyam, Masyhur; Krisnanto, Sugeng
Civil Engineering Forum Teknik Sipil Vol 18, No 1 (2008): JANUARI 2008
Publisher : Civil Engineering Forum Teknik Sipil

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Abstract

Bamboo pile-mattress was proposed as an alternative ground reinforcement to support road embankment on soft soils for the Surabaya Eastern Ring Road Project. A full scale test program was performed to investigate reliability of the reinforcement system since standard calculation for this type of construction was not available. The full scale program was consisted of ground settlement monitoring by settlement plates and pore water pressure monitoring by piezometers. Readings were taken for each stage of embankment construction. Analytical and numerical analyses were also performed to verify the full scale test results. Analytical calculation for immediate settlement was performed based on the elasticity theory, for consolidation settlement was performed by the 1-D Terzaghi?s consolidation theory. Numerical calculation was performed using the finite element method utilizing a commercial software package called PLAXIS. In the finite element analyses, subsurface soil and embankment were modeled as elastic-plastic solid materials using the Mohr-Coulomb failure criteria. Bamboo piles and mattress were modeled as elastic-plastic springs and elastic-plastics beams, respectively. Monitoring records and analysis results show that bamboo pile-mattress reinforcement has effectively increased stability. Consolidation settlement was found to be relatively uniform. Results also show that monitoring records and analysis results are relatively similar.
KOMPARASI NILAI FAKTOR AMPLIFIKASI TANAH DENGAN PENDEKATAN SSA DAN HVSR PADA WILAYAH KECAMATAN TEMBALANG KOTA SEMARANG Partono, Windu; Irsyam, Masyhur; R.W, Sri Prabandiyani; Maarif, Syamsul
TEKNIK Volume 34, Nomor 3, Tahun 2013
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (666.857 KB) | DOI: 10.14710/teknik.v34i3.6983

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Several methods for evaluating the effect of site specific condition of soil layers against earthquakes are presently available. Site Specific Analysis (SSA) and Horizontal-to-Vertical Spectral Ratio (HVSR) are two methods commonly used for estimating the amplification factor of soil layers above bedrock. SSA can be performed using subsurface shear wave velocities and dynamic soil properties (density, shear modulus and damping). The HVSR is a simple method for estimating the site amplification factor. Based on the time and budget requirement HVSR is more efficient and effective compare to SSA method.This paper presents result of SSA and HVSR methodscomparison for estimating the amplification factor of soil layers. Two boring locations and six single station seismometer tests were perform within Tembalang District Area.
PERSEPSI PENGEMBANGAN PETA RAWAN GEMPA KOTA SEMARANG MELALUI PENELITIAN HAZARD GEMPA DETERMINISTIK Partono, Windu; Irsyam, Masyhur; Retno Wardani, Sri Prabandiyani; Maarif, Syamsul
TEKNIK Vol 36, No 1 (2015): (Juli 2015)
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (868.249 KB) | DOI: 10.14710/teknik.v36i1.7701

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Pengembangan peta resiko gempa berdasarkan analisa hazard gempa deterministik (DSHA) merupakan salah satu tahapan yang sangat penting untuk mitigasi kegempaan Kota Semarang. Penelitian peta resiko gempa mencakup perhitungan hazard gempa, analisa kondisi tanah lokal (SSA) dan analisa tingkat resiko kegempaan. Analisa hazard gempa diimplementasikan dengan pendekatan deterministic akibat gempa untuk sumber gempa sesar aktif disekitar Kota Semarang. Parameter geoteknik diperoleh dari hasil pengamatan atau pengujian geoteknik. Hasil dari penelitian ini mencakup pengembangan peta spektra percepatan gerakan tanah di permukaan dan faktor amplifikasi percepatan tanah yang sangat diperlukan pada pengembangan peta rawan gempa Kota Semarang.[Perception Development of Seismic Risk Map Semarang City Through Deterministic Hazard Analysis Research] Development of seismic risk map based on Deterministic Hazard Analysis (DSHA) is an important step for seismic disaster mitigation for Semarang City. The study includes estimation of seismic hazard (DSHA), site specific response analysis (SSA) and risk assessment. Seismic hazard is performed based on deterministic approach considering shallow crustal fault sources influencing Semarang City. Geotechnical parameters are interpreted from previous geotechnical measurements. The result of the hazard analysis includes the distribution of site response spectral acceleration and amplification ratios are performed corresponding to seismic risk assessment for Semarang City. 
REABILITAS DAYA DUKUNG PONDASI TIANG BOR BERDASARKAN FORMULA REESE & WRIGHT DAN USULAN LOAD RESISTANCE FACTOR DESIGN DALAM PERENCANAAN PONDASI TIANG BOR STUDI KASUS PROYEK JAKARTA Lastiasih, Yudhi; Irsyam, Masyhur; Sidi, Indra Djati; Toha, FX
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 19, Nomor 2, DESEMBER 2013
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (475.78 KB) | DOI: 10.14710/mkts.v19i2.8422

Abstract

Design bored pile foundation often use formulae of Reese and wright (1977) on projects heild in Jakarta. The safety factor often use on the design foundation on project in Jakarta are generally 2 or 3. By using advance First Order Liability Method to analysis design foundation, the result showed that the design was very conservative. Proven by the safety index for this design is 2.68 where?s the equivalent of failure probably 3.72 x 10-3, this result is less than requirement of failure probability 1 x 10-2. Lastiasih (2012) propose the use of multiple safety factors by applying Load Resistance Factor Design (LRFD) in accordance with the design of building age so as not to use single safety factor again. Further more the design of bored pile foundation become more efficient.
APLIKASI METODE HVSR PADA PERHITUNGAN FAKTOR AMPLIFIKASI TANAH DI KOTA SEMARANG Partono, Windu; Irsyam, Masyhur; Prabandiyani R.W., Sri; Maarif, Syamsul
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 19, Nomor 2, DESEMBER 2013
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1325.981 KB) | DOI: 10.14710/mkts.v19i2.8421

Abstract

The Horizontal-to-Vertical Spectral Ratio (HVSR) is a simple method for estimating the resonance frequency of sedimentary layers. This method can also be used for estimating the site amplification factor. By using the resonance frequency and the amplification factor HVSR method can also be used for predicting the depth of the bed rock or the thickness of sediment layer (Nakamura, 1989). This paper presents results of HVSR method applied to ambient vibrations for estimating the amplification factor of sedimentary layer. A total of 16 ambient vibration measurements were performed in the City of Semarang to predict the amplification factor for the shallow sedimentary layers.
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.
Pengaruh Strength Reduction Tanah Clay-Shale Akibat Pelaksanaan Pemboran Terhadap Nilai Daya Dukung Pondasi Tiang di Jembatan Suramadu Berdasarkan Analisis Hasil Tes OC Irsyam, Masyhur; Sahadewa, Andhika; Boesono, Atyanto; Soebagyo, Soebagyo
Jurnal Teknik Sipil Vol 14, No 2 (2007)
Publisher : Institut Teknologi Bandung

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Abstract

Abstrak. Jembatan Suramadu yang akan menghubungkan kota Surabaya dengan Madura memiliki bentang total sepanjang 5.438 m. Mengingat lokasi pembangunan yang berada di laut dan beban rencana yang besar pada tiang pondasi, maka uji pembebanan statik konvensional tidak mungkin untuk dilakukan di jembatan utama. Alternatif tes pembebanan tiang yang dapat dilakukan adalah Tes OC yang mengikuti  prosedur Osterberg Cell Test. Tes ini dilengkapi dengan load cell, telltale, dan strain gauge sehingga dapat diperoleh kurva load-displacement untuk tahanan ujung dan tahanan selimut pada berbagai kedalaman. Hasil penyelidikan tanah menunjukkan keberadaan lapisan tanah clay-shale yang mengandung montmorillonite pada lokasi tiang bor. Jenis tanah ini sensitif terhadap berkurangnya tegangan lateral akibat pemboran dan terhadap weathering process sehingga dapat terjadi strength reduction. Strength reduction tanah menyulitkan predikasi tahanan ujung dan tahanan selimut pondasi tiang bor. Hasil Tes OC digunakan sebagai acuan dalam menentukan pengaruh strength reduction terhadap tahanan ujung dan tahanan selimut dengan cara membandingkan hasil pengukuran dengan hasil prediksi berdasarkan korelasi empiris yang umum dipakai. Untuk tahanan ujung, hasil Tes OC menunjukkan harga yang relatif dekat dengan hasil prediksi sehingga strength reduction untuk tahanan ujung akibat pemboran relatif kecil selama kondisi dasar pondasi bersih. Sedangkan untuk tahanan selimut, hasil pengukuran nilainya jauh lebih kecil dibanding hasil prediksi. Untuk meningkatkan daya dukung, maka dilakukan grouting melalui ujung tiang. Hasil pengujian menunjukkan bahwa setelah dilakukan grouting pada pondasi terjadi kenaikan nilai tahanan ujung dan tahanan selimut. Dibandingkan dengan tahanan ujung, tahanan selimut memiliki peningkatan kekuatan yang lebih besar dan setelah dilakukan grouting nilainya mendekati nilai prediksi. Abstract. Suramadu Bridge, which will connect Surabaya and Madura, is designed to have 5,438 m total span. Considering bridge construction that is above sea and huge design load on its pile foundations, conventional static loading test can not be performed at the main bridge. Alternative pile load test that can be performed is OC Test, which followed Osterberg Cell Test procedure. Equipped with load cell, telltale, and strain gauge, this test can provide load-displacement curve of end bearing and skin friction at any depth. Soil investigation result shows existence of clay-shale layer, which contains montmorillonite, at bore pile’s location. This soil is sensitive to lateral pressure reduction caused by boring and weathering process so that strength reduction can occur. Strength reduction of soil makes end bearing and skin friction difficult to be predicted. Strength reduction effect toward end bearing and skin friction are determined by means of comparing OC Test result to prediction result based on common empirical correlation. For end bearing, OC Test result shows value that close to prediction result’s. Therefore, strength reduction of end bearing caused by boring is relative small. On the other hand, skin friction measurement result shows that its value is much smaller than prediction result’s. For increasing bearing capacity, grouting through the pile base was conducted. Test result shows increasing of value either end bearing and skin friction after grouting through the pile base. Compared to end bearing’s value, skin friction’s value rise more and close to prediction value.
Hazard Deaggregation for Indonesia Makrup, L.L.; Irsyam, Masyhur; Sengara, I Wayan; Hendriyawan, Hendriyawan
Jurnal Teknik Sipil Vol 17, No 3 (2010)
Publisher : Institut Teknologi Bandung

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Abstract

Abstract. Hazard deaggregation is required in seismic hazard analysis in order to determine the controlling magnitudes and distances for particular return periods of earthquakes. These magnitude and distance are required for physical interpretation of the results from probabilistic seismic hazard analysis and to take certain engineering decisions. This paper presents a development of hazard deaggregation for Indonesia. The deaggregation process is started by calculating the ground shaking with hazard level 10% probability of exceedance in 50 years. In this study, the deaggregation hazard map was analyzed using total probability method and by applying three dimensional (3-D) source models and recent seismotectonic parameters. Three source models were used in this analysis, namely: subduction zones, transform fault zones and background source zone. Indonesian earthquake source models were constructed and published attenuation relations to calculate the peak ground acceleration for rock site conditions were used in the analysis. The recurrence rates and sizes of historical earthquakes on known and inferred faults and across zones were determined from modified earthquake catalog. The results of this study are deaggregation hazard maps of Indonesia for 10% probability of exceedance in 50 years.Abstract. Deagragasi hazard diperlukan dalam analisis seismic hazard untuk menentukan jarak dan magnitude kendali untuk perioda ulang gempa tertentu. Jarak dan magnitude ini digunakan untuk interpretasi fisik terhadap hasil dari analisis seismic hazard probabilistik dan untuk mengambil keputusan tentang hal yang bersifat keteknikan. Paper ini memberikan hal berupa pengembangan deagregasi hazard untuk Indonesia. Proses deagregasi dimulai dengan menghitung goncangan tanah dengan level hazard 10% probabilitas terlampaui dalam jangka waktu 50 tahun. Dalam studi ini, deagregasi hazard diananlisis menggunakan metoda probabilitas total dengan mengaplikasikan model sumber gempa tiga dimensi dan parameter seimotektonik terbaru. Tiga model sumber gempa digunakan dalam analisis ini yaitu sumber gempa zona subduksi, transform fault dan sumber background. Model sumber gempa Indonesia telah dikembangkan dan fungsi atenuasi yang terpublikasi digunakan untuk menghitung percepatan tanah puncak untuk kondisi site batuan. Ukuran dan laju keberulangan gempa-gempa histori pada fault yang sudah dikenal maupun fault yang keberadaanya masih dalam dugaan dan juga pada zona yang lain ditentukan dari katalog gempa yang telah dimodifikasi. Hasil dari studi ini adalah berupa peta deagregasi hazard untuk Indonesia dengan 10% probabilitas terlampaui dalam jangka waktu 50 tahun
PROPOSED LONG PERIOD TRANSITION MAP FOR NEW INDONESIA EARTHQUAKE RESISTANT BUILDING CODE BASED ON INDONESIA SEISMIC HAZARD MAP 2010 Fauzi, Usama Juniansyah; Fauzi, Achmad; Irsyam, Masyhur; Toha, F. X.; Hendriyawan, .
Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 1, No 2 (2011): Engineering
Publisher : Syiah Kuala University

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Abstract

The new method for determining ground-motion parameters in the next edition of the Indonesian Earthquake Resistant Building Code SNI 03-1726-X, which will be issued in this year, has significant changes than the old code. The major changes in SNI 03-1726-X are using Risk-Targeted Maximum Considered Earthquake (MCER) Spectral Response Acceleration maps. These maps developed by Team for Revision of Seismic Hazard Maps of Indonesia were based on probabilistic approach for 2% probability of exceedance in 50 years and deterministic approach by using three-dimensional seismic source models and by considering latest geological and seismological data and fragility curve of buildings. For building design, it has been decided that ASCE 7-10 will be adopted for coming code SNI 03-1725-X. The design philosophy adopted from ASCE 07-10 standard contains a significant addition consisting of a constant-displacement segment of the design response spectrum. This paper presents the proposed parameter TL developed by the author and Disaster Mitigation Research Center ITB (Pusat Penelitian Mitigasi Bencana ITB) to provide more realistic estimates of the ground motions at periods T 4 sec by consisting a constant-displacement segment.
METHODOLOGY OF SITE-SPECIFIC SEISMIC HAZARD ANALYSIS FOR IMPORTANT CIVIL STRUCTURE Irsyam, Masyhur; Dangkua, Donny T.; Kusumastuti, Dyah; Kertapati, Engkon K.
Civil Engineering Dimension Vol 9, No 2 (2007): SEPTEMBER 2007
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (511.566 KB) | DOI: 10.9744/ced.9.2.103-112

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Note from the Editor The Indonesian archipelago is one of the most active tectonic zones in the world. Therefore to design an important (and dangerous) structure such as a nuclear power plan knowledge of the seismicity of the site is very important. This could be achieved by doing a site-specific seismic hazard analysis. A site-specific seismic hazard analysis is required in the design state in order to determine the recommended seismic design criteria of the structure. A complete and thorough explanation of the methodology to do a site-specific seismic hazard analysis is presented in this Technical Note Abstract in Bahasa Indonesia :