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All Journal Jurnal Teknik ITS IPTEK The Journal for Technology and Science Journal of Civil Engineering
Prasetya, Dwi
Civil Engineering Department, Faculty Of Civil, Environmental And Geo Engineering, Institut Teknologi Sepuluh Nopember (ITS), Surabaya, Indonesia
Computer Science & IT Engineering

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Numerical Investigation of Reinforced Concrete Beam Due to Shear Failure Piscesa, Bambang; Alrasyid, Harun; Prasetya, Dwi; Iranata, Data
IPTEK The Journal for Technology and Science Vol 31, No 3 (2020)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v31i3.7385

Abstract

This paper investigates the possibility of using a multi-surface plasticity model to predict shear failure in reinforced concrete beams. The analysis is carried out using the in-house software called 3D-NLFEA. The constitutive model for the concrete material is based on the plasticity-fracture model, which had previously developed to simulate the behavior of concrete cover spalling in reinforced concrete columns. To obtain the asymmetric shear failure pattern, random material properties imperfection for each meshed element is used. Two beams available in the literature are investigated and compared with the analysis results using 3D-NLFEA. From the comparisons, excellent agreement between the analysis and the test result was obtained. 3D-NLFEA can predict the peak load accurately. The peak load prediction only varies 2.19% for beam OA1 and 3.28 % for beam OA2, and it was lower than the test results. The failure crack patterns also show a typical diagonal crack extension from the support to the loading steel plate.
Desain Pabrik Olefin berbahan baku Low Rank Coal di Kabupaten Banjar Kalimantan Selatan Anastasia Ayu Pratiwi; Galih Dwi Prasetya; Gede Wibawa; Kuswandi Kuswandi
Jurnal Teknik ITS Vol 5, No 2 (2016)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (233.056 KB) | DOI: 10.12962/j23373539.v5i2.16784

Abstract

Olefin dapat didefinisikan sebagai hidrokarbon tak jenuh yang mengandung satu atau lebih pasangan atom karbon yang memiliki ikatan rangkap. Dua jenis produk industri olefin yang paling penting adalah etilena dan propilena sebagai bahan baku utama bermacam-macam industri petrokimia. Umumnya produksi etilena dan propilena menggunakan bahan baku Naphta yang diperoleh dari pengolahan minyak bumi dan gas alam. Ketersediaan bahan baku tersebut di Indonesia terbatas dan memiliki harga jual yang fluktuatif. Dengan berorientasi pada efisiensi produksi dan mengurangi impor bahan baku, inovasi proses produksi maupun pembangunan industri olefin yang baru sangat dibutuhkan. Oleh karena itu, diperlukan bahan baku alternatif yang berlimpah dan mudah didapat serta memiliki harga yang murah, seperti batubara. Sumber daya batubara kelas rendah (low rank coal) di Indonesia mencapai 30,57 milyar ton dan perlu dioptimalkan menjadi produk yang bernilai jual lebih. Oleh karena itu, pendirian pabrik olefin dari batubara kualitas rendah sangat potensial dan penting untuk terus dikembangkan. Olefin yang terdiri dari Etilena, Propilena dan Butilena dapat diproduksi melalui indirect process dengan methanol sebagai produk intermediate. Unit – unit prosesnya terdiri dari unit preparasi batubara, unit Gasifikasi batubara untuk menghasilkan gas sintesa (syngas), unit Water Gas Shift untuk pengaturan komposisi gas CO dan H2, unit sintesa Methanol, unit Pemurnian Methanol dari CO2 dan H2O, unit sintesa Olefin dan pemurnian produk serta unit pemisahan produk Olefin yang memisahkan campuran olefin menjadi Etilena, Propylene dan Butylene. Pabrik direncanakan beroperasi dengan kapasitas produksi sebesar 1.485.725 ton Olefin/tahun. Berdasarkan hasil analisa ekonomi, Net Present Value (NPV) pada tahun ke sepuluh pabrik ini sebesar $ 5.723.433.852, Internal Rate of Return (IRR) sebesar 71,68 % yang lebih besar dari bunga bank 10,5% per tahun. Modal pabrik akan kembali setelah pabrik beroperasi selama 2.51 tahun. Sedangkan brdasarkan analisa kepekaan, terdapat 3 variabel yang sangat peka terhadap fluktuasi yaitu harga katalis SAPO-34, harga produk dan kapasitas produksi Etilena, yang dapat mengakibatkan penurunan nilai IRR. Agar stabilitas IRR pabrik tetap terjaga, perlu dilakukan upaya penetapan supplier katalis untuk mendapatkan harga katalis yang stabil, mencari pasar tetap untuk penjualan produk dan menjaga stabilitas kapasitas produksi pabrik.
DUCTILITY EVALUATION OF REINFORCED CONCRETE COLUMN MADE OF NORMAL- TO HIGH-STRENGTH CONCRETE UNDER CONSTANT AXIAL LOAD LEVEL COMBINED WITH FLEXURAL LOADING USING NONLINEAR SECTIONAL FIBER BASED MODEL Bambang Piscesa; Dwi Prasetya; Mudji Irmawan; Harun Alrasyid
Journal of Civil Engineering Vol 34, No 1 (2019)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (388.291 KB) | DOI: 10.12962/j20861206.v34i1.5451

Abstract

This study presents the ductility evaluation of reinforced concrete column made of normal-strength material using various empirical stress-strain model with nonlinear sectional fiber based analysis. The purpose is to evaluate the confinement requirement for reinforced concrete column under high axial load level. The concrete strength considered in the analysis are varies from 30 to 70 MPa while the steel reinforcing bar yield strength considered is only 400 MPa. The ductility is evaluated by using the customized ductility index measurement. The ratio of the concrete cover to the concrete core is set to 0.1 but not more than 40 mm. Attard and Setunge’s concrete constitutive model is used in this investigation. Cover spalling behavior is considered in the analysis by including the restrained shrinkage effect on the concrete strength and the softening behavior. From this study, it was found that extra confinement is necessary to maintain the expected minimum level of ductility.
Strength reduction factor evaluation of the circular reinforced concrete column with varying eccentricity ratio (e/h) Wahyuniarsih Sutrisno; Mudji Irmawan; Dwi Prasetya
Journal of Civil Engineering Vol 35, No 1 (2020)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v35i1.7788

Abstract

This paper presents strength reduction factor evaluation of circular reinforced concrete column with varying eccentricity ratio (e/h) using the first-order-reliability-methods. The resistance properties of the reinforced concrete column is estimated using the monte-carlo simulation with random normally distributed material properties. Only dead and live load combination considered in the analysis. The parameters being investigated when evaluating the resistance of the reinforced concrete column are the concrete compressive strength, steel yield strength, coefficient of variation for both the concrete and steel materials, reinforced concrete column size, and the longitudinal reinforcement ratio. When evaluating the strength-reduction factor, the safety index values are 3.0, 3.5, and 4.0. From the analysis, it was found out that the strength reduction factor, for e/h higher than one and with safety index equal to 3.0, was equal to 0.9 which agrees well with the ACI 318 strength reduction factor for tension-controlled region. However, for e/h lower than one and safety index equal to 3.0, the strength reduction factor was equal to 0.6 which was lower than the ACI 318 strength reduction factor for compression-compression controlled region.
Co-Authors Alrasyid, Harun Anastasia Ayu Pratiwi Bambang Piscesa Gede Wibawa Iranata, Data Irmawan, Mudji Kuswandi Kuswandi Wahyuniarsih Sutrisno