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Oktarina, Devi
Prodi Teknik Sipil, Fakultas Teknik, Universitas Malahayati Jl. Pramuka No. 27, Kemiling, Bandar Lampung 35153
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PENGARUH PENAMBAHAN SERAT BAMBU BETUNG TERHADAP KAPASITAS ULTIMIT BETON BERTULANG Purwanto, Edi; Oktarina, Devi; Hasanah, Siti
Jurnal Rekayasa Teknologi dan sains Vol 1, No 2 (2017): Jurnal Rekayasa, Teknologi, dan Sains
Publisher : Fakultas Teknik Universitas Malahayati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33024/jrets.v1i2.1101

Abstract

Seiring dengan perkembangan jaman, penggunaan beton dituntut untuk semakin meningkat dari segi kualitasnya, sehingga dibutuhkan suatu cara untuk meningkatkan kekuatan beton tersebut. Salah satu cara untuk meningkatkan kuat tekan beton adalah dengan cara memberikan bahan tambah seperti mikrosilika sebagai bahan pozzoland atau bahan yang lain yang dapat menambah kekuatan beton, yaitu penambahan serat bambu yang merupakan tumbuhan yang banyak tumbuh di Indonesi. Beberapa penelitian bambu memiliki kuat tarik yang cukup tinggi. Oleh karena itu bambu dapat dijadikan alternatif untuk memperkuat balok beton untuk menahan tegangan tarik. Penelitian ini digunakan bahan tambah kulit bambu Betung (Dendrocalamus Asper), sebagai fiber karena bambubetung cukup rapat dan ruasnya panjang. Selain itu, bambu ini bersifat keras dan dinding batangnya relatif tebal yakni sekitar 1-3 cm. Penelitian menggunakan benda uji yang akan dibuat terdiri dari silinder diameter 150 mm dengan tinggi 300 mm, balok dengan ukuran 750 mm x150 mm x 150 mm. Masing-masing dibuat sebanyak 12 buah benda uji terdiri dari empat variasi prosentase kadar serat yaitu 0%; 0,2%; 0,4%; 0,6% serta FAS 0,5. Penambahan serat bambu Betung sangat berpengaruh terhadap kapasitas ultimit beton bertulang yaitu terjadi peningkatan kuat tekan sebesar 24,31% dan kuat tarik sebesar 77,12% pada volume serat 0,4%., tetapi kuat lentur mengalami penurunan sebesar 0,75%.Kata Kunci : kuat tekan, kuat tarik, kuat lentur, bambu Betung.ABSTRACT: The influence of bamboo betung fibers addition againts the ultimit reinforced concrete capacity.With the advent of time, the use of concrete forced to increase in terms of quality, so it needs a way to improve the concrete strength .One way to strong increase press concrete is by granting of added as microsilica as a pozzoland or material other increased concrete, the additional fiber bamboo is plants much grown in Indonesia. A number of studies bamboo has a strong pull a high. Hence bamboo can be used as an alternative to strengthen concrete blocks to hold voltage pull .This research used of materials added the skin bamboo betung (dendrocalamus asper) as fiber because bamboo betung enough meetings and ruasnya long. In addition , bamboo this is a hard and its walls relatively thick about 1-3 cm. The research uses objects test to be made consisting of a cylinder diameter 150 mm and height of 300 mm , beam with size 750 mm x150 mm x 150 mm. each made as much as 12 objects test consisting of four variation prosentase levels fibers that is : 0 %; 0.2 %; 0.4 %; 0.6 % and fas 0.5 .The addition of fibers bamboo betung good affect on capacity ultimit reinforced concrete that is been an increase in compression strenght of 24,31 % and tensile strenght of 77,12 % in volume fibers 0.4 %, but flexural strenght decreased by 0.75 %.Keywords : compression strength, tensile strength, flexural strength, Betung bamboo
ANALISIS LOADING PROFILE BUS RAPID TRANSIT (BRT) TRANS BANDAR LAMPUNG (Studi Kasus : Trayek Rajabasa – Sukaraja) Oktarina, Devi; Dharmawan, Weka Indra
Jurnal Rekayasa Teknologi dan sains Vol 4, No 1 (2020): Jurnal Rekayasa, Teknologi, dan Sains
Publisher : Fakultas Teknik Universitas Malahayati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33024/jrets.v4i1.2501

Abstract

 ABSTRAKAngkutan umum yang beroperasi di Bandar Lampung sudah cukup banyak jumlahnya, salah satunya adalah angkutan umum bus rapid transit (BRT) trans Bandar Lampung dengan trayek Rajabasa-Sukaraja. Seberapa besar pengguna anggutan umum Bus Rapid Transit (BRT) Trans Bandar Lampung dapat diketahui dengan melakukan kajian Loading Profile yang merupakan penggambaran grafik besar kecilnya jumlah penumpang didalam kendaraan pada setiap pemberhentian satu trip. Penelitian yang dilakukan adalah penelitian deskriftif melalui kegiatan survey dengan surveyor berada didalam angkutan umum BRT rute trayek Rajabasa-Sukaraja kemudian menghitung para responden (Penumpang BRT) untuk memperoleh data yang di inginkan sebagai langkah awal dalam tahap pengolahan data. Survey dilakukan pada hari senin perwakilan hari kerja, hari sabtu dan hari minggu mewakili hari libur. Hasil survey naik turun penumpang BRT trayek Rajabasa – Sukaraja maupun Sukaraja – Rajabasa bervariasi dari penumpang jarak dekat maupun penumpang jarak jauh. Hasil penelitian diperoleh Travel Time untuk perjalanan satu rit yaitu 2 jam 3,5 menit, nilai Headway rata-rata 15 menit dan Load Factor trayek Rajabasa – Sukaraja yaitu hari senin 59,33 %, hari sabtu 54,41 % dan hari minggu 24,23 %, sedangkan untuk trayek Sukaraja – Rajabasa hari senin 81,68 %, hari sabtu 94,19 % dan minggu 29,03 %. Kata kunci: bus rapid transit (BRT), kapasitas muatan, waktu perjalanan, waktu antara ABSTRACT The Analysis Of Loading Profile Bus Rapid Transit (BRT) Trans Bandar Lampung (Case Study: Rajabasa Route - Sukaraja). Public transportation that operates in Bandar Lampung enough numerous, one is public transport Bus Rapid Transit (BRT) trans Bandar Lampung with Rajabasa-Sukaraja route. How big public transport passenger Bus Rapid Transit (BRT) trans bandar lampung were identified with conduct a study loading profile that is the depiction of a chart the size of the number of passengers in a vehicle on every dismissal of one trip. The research conducted is descriptive research through survey activities with surveyors located in the BRT transport route on the Rajabasa-Sukaraja route and then counting the respondents (BRT Passengers) to obtain the desired data as a first step in the data processing stage. The survey is carried out on Monday representative working days, Saturdays and Sundays representing holidays. Survey results of the ups and downs of Rajabasa - Sukaraja and Sukaraja - Rajabasa BRT route passengers vary from short-distance and long-distance passengers. Survey results of the ups and downs of Rajabasa - Sukaraja and Sukaraja - Rajabasa BRT route passengers vary from short-distance and long-distance passengers. The results obtained by Travel Time for one trip trip are 2 hours 3.5 minutes, the average Headway value of 15 minutes and the Load Factor of the Rajabasa - Sukaraja route are Monday 59.33%, Saturday 54.41% and Sunday 24, 23%, while for the Sukaraja - Rajabasa route Monday is 81.68%, Saturday is 94.19% and Sunday is 29.03%. Keywords: bus rapid transit (BRT), load factor, travel time, headway
PENTINGNYA SISTEM PENCAHAYAAN DAN SIRKULASI UDARA DALAM RUMAH TINGGAL GUNA MENJAGA KESEHATAN LINGKUNGAN Dewi Fadilasari; Devi Oktarina; Rina Febrina; Anwar, Anang Khoiril; Dwi Sindi Sabilla; Febi Ayu Kurniasih; Day Robbi, Nucka Ahmad; Sawalia, Tri Handini
Nemui Nyimah Vol. 4 No. 1 (2024): Nemui Nyimah Vol.4 No.1 2024
Publisher : FT Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Rumah sehat dan nyaman tidak hanya ditentukan oleh kualitaspencahayaan tetapi juga sirkulasi udaranya. Agar distribusi udara berjalan baik, ruangan harus didukung sistem ventilasi yang baik. Sirkulasi udara adalah proses pergantian udara di dalam ruangan dengan memasukkan udara dari luar dan membuang udara di dalam. Rumah butuh aliran udara yang memadai. Caranya dengan menciptakan ventilasi udara yang tepat. Namun belakangan ini banyakorang cenderung mengabaikan ventilasi udara khususnya di Kelurah Karang Maritim, Panjang Bandar Lampung, padahal ventilasi udara yang benar akan membuat rumah lebih sehat. Hal ini terjadi karena kebanyakan dari mereka tidak menyaari bahwa polusi tidak hanya berasal dari luar, tetapi bisa juga berasal dri dalam rumah, contohya: asap rokok, bakteri, karbon dioksida, kompor, dll. Kualitas udara yang buruk berisiko menyebabkan beragam gangguan kesehatan, seperti batuk, sakit tenggorokan, mata berair, atau sesak napas. Untukmeminimalkan risiko-risiko buruk di atas, maka perlu penempatan ventilasi disertai dengan jendela untuk membebaskan udara masuk kedalam ruangan.
Optimization of Environmentally Friendly Material Selection for Automotive Mechatronics Components Using LCA Data and Multi‑Criteria Decision Making (MCDM) Fauzi Ibrahim; Teuku Marjuni; Rina Febrina; Devi Oktarina; Natalina Natalina; Rani Ismiarti Ergantara; Diah Ayu Wulandari Sulistyaningrum
JEECS (Journal of Electrical Engineering and Computer Sciences) Vol. 10 No. 2 (2025): JEECS (Journal of Electrical Engineering and Computer Sciences)
Publisher : Fakultas Teknik Universitas Bhayangkara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54732/jeecs.v10i2.8

Abstract

The automotive industry faces an increasing demand for sustainable material selection as mechatronic components become more widespread in electrified vehicles. However, data-driven material selection approaches that simultaneously integrate environmental, economic, and technical criteria without laboratory experiments remain underdeveloped. This study addresses this gap by developing a computational framework that combines Life Cycle Assessment (LCA) with a Multi-Criteria Decision-Making (MCDM) approach, specifically the Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) method, using Analytical Hierarchy Process (AHP)–based weights. The framework enables a transparent and reproducible evaluation of environmentally friendly materials for automotive mechatronic components. A case study on an actuator housing evaluates seven material alternatives: Al 6061 (die-cast), recycled Al (die-cast), Mg AZ91 (die-cast), PA6-GF30 (injection), PBT-GF30 (injection), PA12 (SLS 3D print), and bio-based PBT-GF30 (injection). The criteria include total global warming potential (GWP), cumulative energy demand (CED), water use, recyclability, cost, mass, stiffness index, thermal conductivity, and supply risk. Results show that recycled aluminum achieves the highest ranking (closeness coefficient = 0.939), followed by Al 6061 (0.727) and Mg AZ91 (0.547). A Monte Carlo analysis with 1,000 iterations confirms that recycled aluminum consistently remains the best option with 100% robustness under varying weighting conditions. The proposed workflow is replication-ready and can be directly integrated with established LCA databases such as GREET, Ecoinvent, or EPD, enabling engineers to perform sustainable and quantitative material decisions using only data and computational analysis.
Co-Authors Adithia Brilianto Agung Aji Perdana agus darmawan Agus Darmawan Akbar, Aldharin Rizky ALFIARINI, ALFIARINI Anwar, Anang Khoiril Apriyanto, Agus Aryanti Asmariyadi, Dafa Celvin, Raid Chrisanto, Eka Yudha Day Robbi, Nucka Ahmad Dewi Fadilasari Diah Ayu Wulandari Sulistyaningrum Dina Dwi Nuryani Dirangga, Karlia Dwi Sindi Sabilla Edi Purwanto Edi Purwanto Ergantara, Rani Ismiarti Erlangga, Deni Erna Listyaningsih Fauzi Ibrahim Febi Ayu Kurniasih Febrina, Rina Fuji Lestari Gumay, A Gumay, Arminsyah Habsyi, M Alfi Al Hanif Syahroni Ibrahim, Fauzi Ika, Nurika Aulia Juansyah, Yan KA, Anang Krisnanda, Rico Kusuma, Alan Mei Lolita Sary Mariana Safitri, Mariana Mentiring, Benny Muhammad Zulfiqar Muhani, Nova Mulyado, Riski Natalina Natalina Natalina Natalina Oktavia, Amelia Olyvia Ayu P Otimah, Otimah Pratiwi Pratiwi Qodiron, Lailatul Qoli Paundra Rendi, Ketut Rian Pebri Rina Febrina Rina Febrina, Rina Rudiansyah Rudiansyah, Rudiansyah S, Tri Handini Saputra, Ariyan Sari, Yona Sawalia, Tri Handini Septianto, Mendi Setiawati Setiawati Siti Hasanah Surya Sebayang Teuku Marjuni Tiara Fatrin Ulfa, Ade Maria Weka Indra Dharmawan Wibowo, Tito Catur Wisman, Mira Wulan Permata Sari Yogi Primadasa