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All Journal MEDIA KOMUNIKASI TEKNIK SIPIL REKA RACANA Journal of Engineering and Technological Sciences Jurnal Teknik Sipil Jurnal Jalan Jembatan EDUKASI Journal of Engineering and Technological Sciences
Indra Djati Sidi
Department Of Civil Engineering, Institut Teknologi Bandung, Jalan Ganesha No. 10, Bandung 40132, Indonesia
Religion Aerospace Engineering Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Education Electrical & Electronics Engineering Engineering Other

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Reliability of Estimation Pile Load Capacity Methods Lastiasih, Yudhi; Sidi, Indra Djati
Journal of Engineering and Technological Sciences Vol 46, No 1 (2014)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (369.62 KB) | DOI: 10.5614/j.eng.technol.sci.2014.46.1.1

Abstract

None of numerous previous methods for predicting pile capacity is known how accurate any of them are when compared with the actual ultimate capacity of piles tested to failure. The author’s of the present paper have conducted such an analysis, based on 130 data sets of field loading tests. Out of these 130 data sets, only 44 could be analysed, of which 15 were conducted until the piles actually reached failure. The pile prediction methods used were: Brinch Hansen’s method (1963), Chin’s method (1970), Decourt’s Extrapolation Method (1999), Mazurkiewicz’s method (1972), Van der Veen’s method (1953), and the Quadratic Hyperbolic Method proposed by Lastiasih et al. (2012). It was obtained that all the above methods were sufficiently reliable when applied to data from pile loading tests that loaded to reach failure. However, when applied to data from pile loading tests that loaded without reaching failure, the methods that yielded lower values for correction factor N are more recommended. Finally, the empirical method of Reese and O’Neill (1988) was found to be reliable enough to be used to estimate the Qult of a pile foundation based on soil data only.
Probability Based Evaluation of Vehicular Bridge Load using Weigh-in-Motion Data Nugraha, Widi; Sidi, Indra Djati
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 (763.558 KB) | DOI: 10.5614/10.5614/j.eng.technol.sci.2016.48.1.6

Abstract

Load and Resistance Factored Design (LRFD) method for designing bridge in Indonesia have been implemented for more than 25 years. LRFD method treating loads and strengths variables as random variables with specific safety factors for different loads and strengths variables type. The nominal loads, load factors, reduction factors, and other criteria for bridge design code can be determined to meet the reliability criteria. Statistical data of weigh-in-motion (WIM) vehicular loads measurement in Northern Java highway, Cikampek - Pamanukan, West Java (2011), used in as statistical loads variable. A 25 m simple span bridge with reinforced concrete T-girder is used as a model for structural analysis due to WIM measured and nominal vehicular load based on RSNI T-02-2005, with applied bending moment of girder as the output. The distribution fitting result of applied bending moment due to WIM measured vehicular loads is lognormal. The maximum bending moment due to RSNI T-02-2005 nominal vehicular load is 842.45 kN-m and has probability of exceedance of 5x10-5. It can be concluded, for this study, that the bridge designed using RSNI T-02-2005 is safely designed, since it has reliability index, β of 5.02, higher than target reliability, β ranging from 3.50 or 3.72.
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.
Probabilistic Modeling of Updating Epistemic Uncertainty In Pile Capacity Prediction With a Single Failure Test Result Sidi, Indra Djati
Jurnal Teknik Sipil Vol 24, No 3 (2017)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1197.111 KB) | DOI: 10.5614/jts.2017.24.3.1

Abstract

AbstractThe model error N has been introduced to denote the discrepancy between measured and predicted capacity of pile foundation. This model error is recognized as epistemic uncertainty in pile capacity prediction. The statistics of N have been evaluated based on data gathered from various sites and may be considered only as a general-error trend in capacity prediction, providing crude estimates of the model error in the absence of more specific data from the site. The results of even a single load test to failure, should provide direct evidence of the pile capacity at a given site. Bayes theorem has been used as a rational basis for combining new data with previous data to revise assessment of uncertainty and reliability. This study is devoted to the development of procedures for updating model error (N), and subsequently the predicted pile capacity with a results of single failure test.AbstrakRasio antara kapasitas aksial pondasi tiang yang diukur melalui percobaan uji beban dengan kapasitas yang dihitung melalui formula dapat dianggap sebagai model error N yang menggambarkan kesalahan epistemic dalam perhitungan pondasi tiang. Data statistik N yang diperoleh dari berbagai lokasi dapat dianggap sebagai kecendrungan umum kesalahan (general error trend) yang melekat pada formula yang digunakan. Hasil percobaaan beban pada lokasi tertentu dimana bangunan terletak harus menjadi indikator langsung akan variasi kapasitas aksial tiang pada lokasi tertentu. Pada studi ini model error awal sebagai nilai kecendrungan umum dapat di update melalui kerangka teorema Bayes. Pengaruh kesalahan akibat friksi dalam alat tekan hidrolik disertakan dalam formulasi. Statistik nilai N yang baru dapat digunakan untuk menentukan kapasitas tiang ataupun angka keamanan yang dipakai dalam perencanaan untuk mencapai target keandalan tertentu.
Probabilistic Modeling of Seismic Risk Based Design for a Dual System Structure Sidi, Indra Djati
Journal of Engineering and Technological Sciences Vol 49, No 2 (2017)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (470.043 KB) | DOI: 10.5614/j.eng.technol.sci.2017.49.2.2

Abstract

The dual system structure concept has gained popularity in the construction of high-rise buildings over the last decades. Meanwhile, earthquake engineering design provisions for buildings have moved from the uniform hazard concept to the uniform risk concept upon recognizing the uncertainties involved in the earthquake resistance of concrete structures. In this study, a probabilistic model for the evaluation of such risk is proposed for a dual system structure consisting of shear walls or core walls and a moment frame structure as earthquake resistant structure. Uncertainties in the earthquake resistance of the dual system structure due to record-to-record variability, limited amount of data, material variability and structure modeling are included in the formulation by means of the first-order second-moment method. The statistics of resistance against earthquake forces are estimated by making use of incremental nonlinear time history analysis using 10 recorded earthquake histories. Then, adopting the total probability theorem, the reliability of the structure is evaluated through a risk integral scheme by combining the earthquake resistance of the structure with the annual probability of exceedance for a given location where the building is being constructed.
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 (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.
Evaluasi Pembebanan Jembatan Box Girder Beton Prategang dengan Pendekatan Probabilitas Menggunakan Hasil Pengukuran Beban Kendaraan Bergerak. (Hal. 136-150) Pribadi, Amatulhay; Sidi, Indra Djati
RekaRacana: Jurnal Teknil Sipil Vol 4, No 2: Juni 2018
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (815.834 KB) | DOI: 10.26760/rekaracana.v4i2.136

Abstract

ABSTRAKPerancangan dari jembatan membutuhkan konsep dasar perancangan struktur yang mencakup keamananan dan utilitas. Oleh karena itu, perlu adanya evaluasi terhadap peraturan pembebanan yaitu SNI 1725:2016, berdasarkan pengukuran beban aktual kendaraan dalam kendaraan bergerak. Data beban kendaraan (WIM) yang diperoleh dari Puslitbang Jalan dan Jembatan diolah secara probabilistik dan statistik dengan bantuan software Microsoft Excel dan EasyFit 5.5 untuk memperoleh kombinasi beban maksimum pada struktur jembatan beton prategang box girder dengan total panjang 160 m dan lebar 9 m yang dimodelkan dengan software Midas Civil 2011. Dari hasil analisis struktur diperoleh bahwa gaya dalam momen lentur maksimum akibat beban nominal standar dalam SNI 1725:2016 sebesar 29.768,24 kNm, lebih tinggi dibanding momen lentur maksimum akibat kombinasi beban terukur WIM yaitu 24.443 kNm. Sebaran momen lentur akibat beban kendaraan hasil pengukuran WIM mengikuti distribusi lognormal. Kemungkinan momen lentur maksimum akibat beban SNI terlampaui adalah  0,00139%. Indeks reliabilitas dari struktur jembatan terhadap beban hasil pengukuran WIM yaitu 4,30 yang terjadi pada girder bagian lapangan serat bawah. Resiko kegagalan yang diperoleh yaitu  = 8,577 x 10-6. Hal ini menunjukkan bahwa struktur jembatan telah didesain secara konservatif karena memiliki resiko kegagalan yang lebih kecil dari target reliabilitas β = 3,50 atau 3,72.Kata kunci: jembatan, beton prategang, standar pembebanan kendaraan, WIM, probabilitas ABSTRACTBridge requires basic concept of structural design which includes security and utilities. To ensure those requirements, an evaluation of the load regulation standards, SNI 1725:2016, based on actual vehicular moving load is needed in order to know whether the quantity of the load is too conservative or not. The vehicular load data (WIM) which obtained from Puslitbang Jalan dan Jembatan is processed probabilistic and statistically using Microsoft Excel and EasyFit 5.5 to obtain the maximum load combination on the structure of prestressed concrete box girder bridge with a total length of 160 m and a width of 9 m which was modeled using Midas Civil 2011. The analysis result showed that the maximum bending moment due to standard nominal load of SNI 1725:2016  is 29,768.24 kNm, higher than the maximum bending moment due to the combination of the measured load (WIM) which is 24,443 kNm. The distribution of bending moment due to measured vehicular load (WIM) is lognormal. The maximum bending moment due to standard nominal vehicular load (SNI) has probability of exceedance of 0.00139%. Realibity index of the bridge structure to the load measurement (WIM) is 4,3 which occurred in the bottom fiber of mid-span girder. The risk of failure obtained by  = 8.577 x 10-6. This indicates that bridge structure has been designed conservatively because the risk of failure is lower than the reliability target β = 3.50 or 3.72.Keywords: bridge, prestressed concrete, vehicular load standard, WIM, probability
Probability Based Evaluation of Vehicular Bridge Load using Weigh-in-Motion Data Widi Nugraha; Indra Djati Sidi
Journal of Engineering and Technological Sciences Vol. 48 No. 1 (2016)
Publisher : Institute 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.2016.48.1.6

Abstract

Load and Resistance Factored Design (LRFD) method for designing bridge in Indonesia have been implemented for more than 25 years. LRFD method treating loads and strengths variables as random variables with specific safety factors for different loads and strengths variables type. The nominal loads, load factors, reduction factors, and other criteria for bridge design code can be determined to meet the reliability criteria. Statistical data of weigh-in-motion (WIM) vehicular loads measurement in Northern Java highway, Cikampek - Pamanukan, West Java (2011), used in as statistical loads variable. A 25 m simple span bridge with reinforced concrete T-girder is used as a model for structural analysis due to WIM measured and nominal vehicular load based on RSNI T-02-2005, with applied bending moment of girder as the output. The distribution fitting result of applied bending moment due to WIM measured vehicular loads is lognormal. The maximum bending moment due to RSNI T-02-2005 nominal vehicular load is 842.45 kN-m and has probability of exceedance of 5x10-5. It can be concluded, for this study, that the bridge designed using RSNI T-02-2005 is safely designed, since it has reliability index, β of 5.02, higher than target reliability, β ranging from 3.50 or 3.72.
Development of Risk Coefficient for Input to New Indonesian Seismic Building Codes I Wayan Sengara; Indra Djati Sidhi; Andri Mulia; Muhammad Asrurifak; Daniel Hutabarat
Journal of Engineering and Technological Sciences Vol. 48 No. 1 (2016)
Publisher : Institute 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.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.
Probabilistic Modeling of Seismic Risk Based Design for a Dual System Structure Indra Djati Sidi
Journal of Engineering and Technological Sciences Vol. 49 No. 2 (2017)
Publisher : Institute 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.2017.49.2.2

Abstract

The dual system structure concept has gained popularity in the construction of high-rise buildings over the last decades. Meanwhile, earthquake engineering design provisions for buildings have moved from the uniform hazard concept to the uniform risk concept upon recognizing the uncertainties involved in the earthquake resistance of concrete structures. In this study, a probabilistic model for the evaluation of such risk is proposed for a dual system structure consisting of shear walls or core walls and a moment frame structure as earthquake resistant structure. Uncertainties in the earthquake resistance of the dual system structure due to record-to-record variability, limited amount of data, material variability and structure modeling are included in the formulation by means of the first-order second-moment method. The statistics of resistance against earthquake forces are estimated by making use of incremental nonlinear time history analysis using 10 recorded earthquake histories. Then, adopting the total probability theorem, the reliability of the structure is evaluated through a risk integral scheme by combining the earthquake resistance of the structure with the annual probability of exceedance for a given location where the building is being constructed.
Co-Authors Akhmad Ridhwan Ma’sum Amatulhay Pribadi Andri Mulia Andri Mulia, Andri Bambang Budiono Boediono , Bambang Daniel Hutabarat Daniel Hutabarat, Daniel Ediansjah Zulkifli FX Toha Herlien Dwiarti Soemari I Wayan Sengara I Wayan Sengara, I Wayan Jovan Thierry Salim Kusumaningrum , Patria Lastiasih, Yudhi Made Suarjana Masyhur Irsyam Muhammad Asrurifak Muhammad Asrurifak, Muhammad Muharzaki Putri, Wirza Pribadi, Amatulhay Suarjana , Made Widi Nugraha Widi Nugraha Widi Nugraha, Widi Yudi Herdiansah Zulkifli, Ediansjah