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All Journal Journal of Engineering and Technological Sciences Jurnal Teknik Sipil
Indra Djati Sidi
Institut Teknologi Bandung
Civil Engineering, Building, Construction & Architecture Engineering

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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.
Probabilistic Modeling of Updating Epistemic Uncertainty In Pile Capacity Prediction With a Single Failure Test Result Indra Djati Sidi
Jurnal Teknik Sipil Vol 24 No 3 (2017)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | 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.
Keandalan Menara Televisi Rangka Baja Akibat Beban Gempa Indra Djati Sidi; Akhmad Ridhwan Ma’sum
Jurnal Teknik Sipil Vol 24 No 3 (2017)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2017.24.3.5

Abstract

AbstrakPerencanaan struktur menara telah bergeser dari konsep equal hazard menjadi konsep equal risk, dimana semua bangunan dirancang untuk mempunyai tingkat kegagalan atau risiko yang sama nilainya, dalam hal ini 1% dalam masa layan 50 tahun. Berkembangnya konsep ini disebabkan bahwa struktur menara televisi yang dirancang dengan konsep equal hazard ternyata mempunyai tingkat risiko yg tidak sama yang disebabkan oleh variabilitas dari tahanan menara terhadap gempa. Variabilitas kapasitas menara terhadap gaya gempa dipengaruhi oleh variasi gaya gempa yang bekerja yang dikenal sebagai record to record variation. Dalam makalah ini disampaikan model probabilitas untuk menghitung tingkat keandalan menara terhadap gaya gempa, dengan mengkombinasikan kurva hazard dan kurva fragilitas struktur menara. Kapasitas menara atau kurva fragilitas didapatkan dengan mencari peak ground acceleration (PGA) collapse dari menara dengan menggunakan incremental nonlinear time history analysis dari 40 pasang data time history. Reliability atau keandalan menara diperoleh dengan memanfaatkan total probability theorem yaitu dengan melakukan proses risk integral antara kurva hazard dan kurva fragilitas.AbstractThe new earthquake design code emphasizes on uniform risk concept at every structure and every location which is 1% probability of collapse in 50 years, as stated in SNI 1726-2012. Indonesian television tower design, until this research is conducted, still uses the concept of uniform hazard ground motion, sample tower that is assessed in this research included. This research will assess probability of collapse of the sample tower as well as it's performance. Probability of collapse is calculated by risk integrating fragility curve from two different loading direction and hazard curve at the site. The result will then be summarized with the probability of each loading direction included to get the total probability of collapse in 50 years. Fragility curve is generated by Incremental Dynamic Analysis process of 40 different earthquake records. The measured intensity is determined as PGA. The fragility curve is calculated with lognormal distribution parameters of median ( ) and standard deviation (β) which are obtained from the PGA data set of IDA result.
Co-Authors Akhmad Ridhwan Ma’sum Widi Nugraha