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All Journal Jurnal Teknik ITS IJOCE (International Journal of Offshore and Coastal Engineering)
Dirta Marina Chamelia
Institut Teknologi Sepuluh Nopember
Engineering

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Analisis Pengaruh Variasi Heat Input Pengelasan FCAW pada Sambungan Baja BKI Grade A terhadap Sifat Mekanik Muhammad Ichsan Rosidin Yuniarto; Herman Pratikno; Dirta Marina Chamelia
Jurnal Teknik ITS Vol 8, No 2 (2019)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (169.761 KB) | DOI: 10.12962/j23373539.v8i2.47184

Abstract

Kegiatan eksplorasi minyak dan gas di laut membutuhkan fasilitas anjungan lepas pantai khususnya berupa struktur terapung, karena dapat berpindah tempat sesuai kebutuhan. Salah satu rangkaian pekerjaan untuk memproduksi struktur lepas pantai tersebut adalah proses pengelasan. Flux Cored Arc Welding (FCAW) merupakan proses pengelasan yang cocok untuk kegiatan fabrikasi karena memiliki tingkat produktivitas yang tinggi. Tujuan penelitian ini adalah untuk mengetahui pengaruh variasi heat input terhadap kekuatan tarik dan pengamatan struktur makro-mikro pada pengelasan baja BKI Grade A dengan metode pengelasan FCAW. Variasi heat input yang digunakan pada penelitian ini adalah 1,19 KJ/mm, 1,32 KJ/mm, dan 1,46 KJ/mm. Pada hasil pengujian tarik, pengelasan dengan heat input 1,46 KJ/mm memiliki nilai kekuatan tarik terbesar, ultimate strength 453,85 MPa dan yield strength 349,76 MPa. Lebar daerah HAZ tiap spesimen tidak jauh berbeda, adapun pengelasan dengan heat input 1,46 KJ/mm memiliki daerah HAZ terlebar yaitu 18 mm. Sedangkan pada hasil pengamatan struktur mikro, pengelasan dengan menggunakan heat input 1,46 KJ/mm pada bagian weld metal memiliki presentase struktur ferrite paling kecil yaitu 61,1%, kemudian struktur pearlite 38,9%.
Pushover Analysis Pile of ULA Jacket Platform Towards Earthquake Loads by SNI-1726:2012 Dirta Marina Chamelia; Alim Bagus Prakoso; Silvianita Silvianita
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 1, No 1 (2017)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (855.063 KB) | DOI: 10.12962/j2580-0914.v1i1.2875

Abstract

This study aims at analyzing pushover on pile jacket structure based on SNI-1726:2012 standards for earthquake loads. Push­over analysis or ultimate strength was performed on ULA jacket plat­form operated by PHE ONWJ. The jacket platform is operated in the northwestern part of the Java Sea. Design of earthquake loads on ULA jacket platform structure with large seismic accele­ration was obtained. From seismic analysis, dynamic response occurred on ULA jacket platform is evaluated, with natural struc­ture period of 1.256 seconds. The largest shear base values were in X and Y directions resulted from seismic acceleration of PGA 0.2g. On member check, the critical part happens to be one of the members of WD2, and on joint check, the largest UC occurred on 401L joint, both were due to the aforementioned earth quake ace­leration. Pushover analysis was then performed to obtain the value of RSR (Reserve Strength Ratio). The analysis yields an RSR value which far exceed the limiting criteria of API RP 2A WSD of RSR ≥ 0.8. Therefore it could be concluded that ULA jacket platform structure is within the range of low consequence category.
Co-Authors Alim Bagus Prakoso Herman Pratikno, Herman Muhammad Ichsan Rosidin Yuniarto Silvianita Silvianita