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Astriana Hardawati
Jurusan Teknik Sipil, Fakultas Teknik Sipil Dan Perencanaan, Universitas Islam Indonesia, Yogyakarta, Indonesia
Engineering

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APLIKASI ORTHOTROPIC STEEL DECK (OSD) DENGAN RIBS PENAMPANG V PADA JEMBATAN RANGKA TIPE CALENDAR HAMILTON (CH) Astriana Hardawati
TEKNISIA Vol. XXI, No. 2, November 2016
Publisher : Jurusan Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Islam Indonesia

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Abstract

Jembatan rangka baja tipe Calendar Hamilton (CH) dengan pelat lantai beton mempunyai berat sendiri lantai yang cukup dominan daripada lantai dengan struktur baja. Pada penelitian ini diaplikasikan sistem Orthotropic Steel Deck (OSD) sebagai pengganti lantai beton untuk perbaikan jembatan. Sebagai studi kasus adalah jembatan CH dengan bentang 104 m di Keduwang, Imogiri. Tujuan penelitian ini adalah melakukan desain OSD dengan ribs penampang V dengan mempertimbangkan kekuatan fatigue dan menghitung nilai Rating Factor (RF) rangka utama sebelum dan sesudah redecking untuk mendapatkan nilai kapasitas sisa jembatan. Metode yang digunakan yaitu memodelkan pelat OSD dengan menggunakan software ABAQUS untuk mendapatkan dimensi ribs dan pelat yang optimal dari segi berat, dengan batasan strength stress fatigue limit sesuai AASHTO. Selanjutnya, pemodelan jembatan secara keseluruhan dilakukan dengan menggunakan software SAP2000 untuk mengetahui gaya-gaya dalam pada jembatan dan menghitung rating factor (RF). Dari hasil pemodelan ABAQUS didapat 10 variasi pelat OSD yang optimal untuk 3 variasi LHR yaitu 1000, 2000, dan 3000 dan 5 variasi umur rencana yaitu 10 tahun, 20 tahun, 30 tahun, 40 tahun, dan 50 tahun. Dari hasil pemodelan SAP2000 dan analisis diketahui bahwa jembatan dengan pelat OSD memiliki nilai rating factor lebih besar daripada jembatan dengan pelat beton. Nilai rating factor terkecil didapat dari elemen stringer untuk semua variasi jembatan dan nilainya dibawah 1,0.
Eksplorasi Rekaman Gempa-gempa di Indonesia dan Karakteristik Diri yang Dinyatakan dalam Acceleration Based Seismic Intensity Measures (SIMs) Widodo Pawirodikromo; Astriana Hardawati
TEKNISIA Vol 27 No 1 (2022): Teknisia
Publisher : Jurusan Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/teknisia.vol27.iss1.art5

Abstract

Indonesia is a prone country to earthquake hazards. This situation is indicated by the number of earthquakes ranging from small to significant events. However, digital earthquake ground motion data are not available, making it difficult for further research. This paper aims to explore recordings of earthquakes that occurred in Indonesia, which are then presented in digital data and used to identify their damage potential in the form of Seismic Intensity Measures (SIMs). After being traced, it turned out that there were only six earthquakes whose ground acceleration time history was found through the paPers published by researchers. The earthquakes were the Mw 6.2 Yogyakarta (2006), the Mw7.6 Padang (2009), the Mw6.1 Bener Meriah Central Aceh (2013), and the Mw6.5 Pidie Jaya Aceh (2016), the Mw7.5 Palu (2018) and the Mw6.1 Malang (2021) earthquakes. The manual digitization and processing to obtain ground acceleration data every 0.01s time step are required. Eight aspects based on acceleration and two aspects based on response spectrum have been used as parameters for Seismic Intensity Measures SIMs. The exploration results show that the source of the earthquake in Sumatra is still relatively shallow, getting more profound in the Java and Nusa Tenggara subduction. The P.G.A. of the Yogyakarta earthquake is 0.272g with a total duration of more than 50 seconds. In general, according to SNI 1726, 2019, the spectrum has been able to cover all ground acceleration time histories. The Yogyakarta earthquake has the highest Earthquake Power, Arias Intensity, and Potential Destructiveness values, namely PE = 0.255 and IA = 2.201, and P.D. = 0.166.
Investigation of Effective Section Reduction in Low Carbon Steel during SMAW Welding Mushthofa, Malik; Fakhri Pratama Nurfauzi; Astriana Hardawati
Teknisia Vol 28 No 2 (2023): Teknisia
Publisher : Jurusan Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/teknisia.vol28.iss2.art2

Abstract

Welding, with its advantages of expedient execution and reduced weight, is a favored method for structural connections. However, it poses a significant risk, softening the steel and diminishing load-bearing capacity, underscoring the importance of accurate estimation. The need for precision is paramount, as critical infrastructure must remain operational not only during disasters but also during repair and maintenance activities. To address this challenge, this research introduces an approach to estimate the extent of capacity reduction resulting from welding, providing engineers with valuable insights for maintaining these critical systems structural integrity and functionality. The study examined low-carbon steel with various thicknesses, focusing on Heat Affected Zone (HAZ) width calculations and Abaqus simulations. Welding was performed at a speed of 1.67 cm/s with a 5 mm element increment. This research aimed to investigate the impact of welding parameters on low-carbon steel, particularly concerning HAZ measurements. A 4 mm-thick plate generated a 38.73 mm affected zone, while simulations with 5 mm to 12 mm thicknesses produced progressively narrower affected zones. Results demonstrated that steel plate thickness significantly influences the affected zone width, with thicker plates yielding narrower affected zones. The study examined low carbon steel with a 4 mm thickness, focusing on Heat Affected Zone (HAZ) width calculations and Abaqus simulations. Welding was performed at a speed of 1.67 cm/s with a 5 mm element increment. The research aimed to investigate the impact of welding parameters on low carbon steel, particularly concerning HAZ measurements. Results demonstrated that steel plate thickness significantly influences the affected zone width, with thicker plates yielding narrower affected zones. A 4 mm-thick plate generated a 38.73 mm affected zone, while simulations with 5 mm to 12 mm thicknesses produced progressively narrower affected zones.
Co-Authors Fakhri Pratama Nurfauzi Mushthofa, Malik Widodo Pawirodikromo