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All Journal Mekanika: Majalah Ilmiah Mekanika Matriks Teknik Sipil Jurnal Locus Penelitian dan Pengabdian METAL : Jurnal Sistem Mekanik dan Termal
Wibowo Wibowo
Pengajar Fakultas Teknik Jurusan Teknik Sipil Universitas Sebelas Maret Surakarta
Aerospace Engineering Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering

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Pengaruh Media Pendingin pada Perlakuan Panas T6 terhadap Kekuatan Tarik dan Struktur Mikro Komposit Al6061-Pasir pantai Hafidh Rawi Mufti; Hammar Ilham Akbar; Eko Surojo; Wibowo Wibowo; Teguh Triyono; Sukmaji Indro Cahyono; Nurul Muhayat; Triyono Triyono
METAL: Jurnal Sistem Mekanik dan Termal Vol 5, No 2 (2021): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1011.197 KB) | DOI: 10.25077/metal.5.2.51-59.2021

Abstract

Al6061-sea sand composite was manufactured using the stir casting method and its mechanical properties were improved by heat treatment. The T6 heat treatment used to improve the mechanical properties of the composite consists of the following processes: solution heat treatment, quenching, and artificial aging. The solution heat treatment process was carried out at a temperature of 540oC for 6 hours. The quenching process was carried out with different quenching agents (water, oil, and 10% brine). The difference in quenching agents resulted in different cooling rates. After quenching, an artificial aging process was carried out at a temperature of 200 oC for 4 hours. The difference in cooling rate affects the hardness and tensile strength of the specimen. The high cooling rate results in an increase in the tensile strength of the specimen. This is due to the increase in cooling speed, the Mg2Si precipitates formed are smaller in size and located in the grains. The highest tensile strength of specimen (206.67 MPa) is obtained by using brine quenching agent.
Design of the Bengawan Unmanned Vehicle (UV) Roboboat: Mandakini Neo Haris Nubli; Fahri Setyo Utomo; Hananta Diatmaja; Aditya Rio Prabowo; Ubaidillah Ubaidillah; Didik Djoko Susilo; Wibowo Wibowo; Teguh Muttaqie; Fajar Budi Laksono
Mekanika: Majalah Ilmiah Mekanika Vol 21, No 2 (2022): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v21i2.61624

Abstract

Mandakini Neo was made with the ship's capacity, speed, and comfort in mind, as well as the ship's hydrodynamic performance and construction cost. Therefore, the method used to determine the hydrostatic characteristics is through a simulation consisting of a resistance test, stability test, maneuver test, and seakeeping test. The simulation uses Maxsurf software with the Savitsky method, which is then processed by data. Global Positioning System (GPS) and ultrasonic sensor tests were also conducted. Based on the simulation results, the stability of the Mandakini Neo ship has a GZ value of 0.1417 m with an angle of 30°, which follows the standards of the International Maritime Organization (IMO). In testing, the maneuvers obtained have met IMO standards based on tactical and advanced diameters. Based on the seakeeping test, when the speed is 5 knots, the heave movement has the same magnitude for all wave headings, 0.0096 m. while the most considerable rolling motion is in the wave direction of 135°, which is 0.36 m, and the most considerable pitch motion is in the direction of the 180° wave, which is 0.042 m. At a speed of 10 knots, the heave motion produced is the same as for all wave headings.
KAJIAN KUAT LENTUR DAN LENDUTAN PADA VARIASI KETEBALAN PELAT BETON BUBUK REAKTIF DENGAN SILICA FUME 15% DAN PASIR KUARSA 30% Diffa Deff Tiara Pricilia; Wibowo Wibowo; Endah Safitri
Matriks Teknik Sipil Vol 12, No 1 (2024): Juni
Publisher : Program Studi Teknik Sipil FT UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mateksi.v12i1.86763

Abstract

Abstract The need for infrastructure development is increasing in the future. The increase in the need for infrastructure development is directly proportional to the increase in concrete production. One of the concrete innovations to deal with these problems is reactive powder concrete. This concrete has advantages over conventional concrete because it can increase compressive strength, durability, and increase flexural strength. One of the applications of reactive powder concrete is concrete slab structure. This research is intended to identify the effect of concrete slab thickness dimensions on the maximum load, flexural strength, and deflection that occur in the slab. The experimental method was used with test specimens in the form of concrete slabs measuring 70 cm long, and 30 cm wide, and thickness variations of 4 cm, 5 cm, 6 cm, and 7 cm. Flexural strength testing was carried out on specimens in the form of plates and beams with dimensions of 40 cm long, 10 cm wide, and 10 cm high to determine the modulus of rupture value. The modulus of rupture test results are in the form of MOR values, then compared with the compressive strength of concrete. Flexural strength testing is done by placing the plate on top of the two pedestals with centralized loading and placing a dial gauge under the test piece to determine the amount of deflection. The test results in the form of tables and graphs show that the thickness dimension of the slab has a significant effect on the maximum load that can be received by the slab and the deflection that occurs in reactive powder concrete slabs.
KAJIAN SERAPAN KLORIDA PADA BETON BUBUK REAKTIF DENGAN SILICA FUME 15% DAN VARIASI PASIR KUARSA Wibowo Wibowo; Endah Safitri; Daka Arkananta Kastara
Matriks Teknik Sipil Vol 11, No 4 (2023): Desember
Publisher : Program Studi Teknik Sipil FT UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mateksi.v11i4.76145

Abstract

Seiring dengan pesatnya pembangunan infrastruktur dan kebutuhan beton yang tinggi, maka beton dituntut untuk terus berkembang lebih baik lagi. Salah satu inovasi beton mutu tinggi adalah Beton Bubuk Reaktif (Reactive Powder Concrete). Beton bubuk reaktif merupakan inovasi beton yang menggantikan agregat kasar dalam campurannya dengan agregat halus sehingga meningkatkan homogenitasnya yang membuat beton memiliki kuat tekan, durabilitas, dan impermeabilitas yang tinggi. Indonesia merupakan negara kepulauan yang disatukan oleh lautan luas. Hal ini menyebabkan bangunan di daerah pantai dan laut rentan terhadap serangan klorida yang berbahaya pada beton. Penelitian ini bertujuan untuk menentukan pengaruh penggunaan pasir kuarsa 0%; 15%; 20%; 25%; 30%; 35% dan 40% dari berat agregat halus terhadap serapan klorida pada Beton Bubuk Reaktif. Metode yang digunakan adalah eksperimental. Benda uji yang digunakan yaitu beton berbentuk silinder dengan diameter 7,5 cm dan tinggi 15 cm. Pengujian serapan klorida dilakukan dengan cara merendam beton ke dalam larutan klorida 4% selama 10+0,5 menit dan 24 jam kemudian menimbangnya dalam keadaan SSD dan membandingkannya dengan berat kering ovennya. Nilai serapan klorida terendah terjadi saat kadar pasir kuarsa 30% dengan nilai serapan 0,68% untuk perendaman 10+0,5 menit dan 1,58% untuk perendaman 24 jam.Kata Kunci : beton bubuk reaktif, impermeabilitas, pasir kuarsa, serapan klorida, silica fume
Evaluasi Struktur Gedung Akibat Penambahan Lantai dengan Incremental Dynamic Analysis (Studi Kasus: Gedung 8 Lantai di Purwokerto) Bestiar Mahdani; Wibowo Wibowo; Halwan Alfiesa Saifullah
Jurnal Locus Penelitian dan Pengabdian Vol. 5 No. 8 (2026): JURNAL LOCUS: Penelitian dan Pengabdian
Publisher : Riviera Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58344/locus.v5i8.6326

Abstract

Penelitian ini bertujuan untuk mengevaluasi kinerja seismik struktur gedung beton bertulang eksisting 8 lantai dan kondisi setelah penambahan 2 lantai menggunakan metode Incremental Dynamic Analysis (IDA). Pemodelan struktur dilakukan secara tiga dimensi menggunakan perangkat lunak SeismoStruct berdasarkan data as-built drawing serta mengacu pada SNI 1726:2019 dan SNI 2847:2019. Analisis dilakukan dengan menggunakan beberapa rekaman gempa yang telah diskalakan dan disesuaikan dengan spektrum respons wilayah studi. Respon struktur dianalisis secara nonlinier melalui analisis riwayat waktu bertahap hingga mencapai kondisi runtuh. Parameter utama yang ditinjau meliputi simpangan antar lantai (inter-story drift), perpindahan lateral, dan gaya geser dasar. Selain itu, kurva kerapuhan (fragility curve) disusun berdasarkan kriteria HAZUS MH-MR5 untuk mengevaluasi probabilitas kerusakan pada berbagai tingkat intensitas gempa. Hasil analisis menunjukkan bahwa struktur eksisting memiliki kinerja seismik yang lebih baik dibandingkan struktur setelah penambahan lantai. Penambahan massa dan tinggi bangunan menyebabkan peningkatan simpangan antar lantai serta mempercepat terjadinya perilaku nonlinier. Kurva kerapuhan menunjukkan pergeseran ke arah intensitas gempa yang lebih rendah pada kondisi struktur setelah penambahan lantai, yang mengindikasikan peningkatan tingkat kerentanan. Probabilitas terlampauinya batas kerusakan pada semua level (slight, moderate, extensive hingga complete damage) juga meningkat secara signifikan. Berdasarkan hasil tersebut, dapat disimpulkan bahwa penambahan satu lantai tanpa perkuatan struktur menurunkan tingkat keandalan seismik bangunan. Untuk kasus ini tidak diperlukan tindakan retrofit untuk meningkatkan kapasitas struktur, karena masih memenuhi kinerja yang disyaratkan. Penambahan satu lantai pada struktur gedung menambah probabilitas kerusakan pada semua tingkat namun tidak signifikan dan nilainya kecil. Terlihat risiko terbesar ada pada kategori Complete dengan risiko 3,75 %
Co-Authors Achmad Basuki Aditya Rio Prabowo Agus Setiya Budi Bambang Santosa Bestiar Mahdani Dewana Istiyan Primasatya Didik Djoko Susilo Diffa Deff Tiara Pricilia Dika Saputri Eko Surojo Endah Safitri Endah Safitri Endah Safitri Fahri Setyo Utomo Fajar Budi Laksono Falih Fakhri Firman Andriyanto Ganesha Wibisono Lubis Hafidh Rawi Mufti Halwan Alfiesa Saifullah Halwan Alfisa Saifullah Halwan Alfisa Saifullah Hammar Ilham Akbar Hananta Diatmaja Haris Nubli Ikhsan Nur Hidayat Kusno Adi Sambowo M. Haris Habibi Maulidah Nur Rizka Mohammad Kamal Muhammad Arbie Khairul Insani Muhammad Luthfi Rifai Muhammad Naufal Muslim Muhayat, Nurul Nabela Nurwikaningtyas Nurmantian Suryawan Purnawan Gunawan Purnawan Gunawan Purwanto Purwanto Sukmaji Indro cahyono Teguh Muttaqie Teguh Triyono Triyono Triyono Ubaidillah Winda Gusanti