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INDONESIA
Forum Mekanika
Published by Institut Teknologi Perusahaan Listrik Negara
ISSN : 23561491     EISSN : -     DOI : -
Core Subject : Science, Engineering,
Civil Engineering, Building, Construction & Architecture Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering
FORUM MEKANIKA Journal, especially for Civil Engineering Lecturers and generally for all Practitioners to be able to contribute in the form of scientific writing that will be useful for the application of science and technology, especially in the field of Civil Engineering.
Arjuna Subject : -
Articles 85 Documents
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Analisis Pemodelan Curah Hujan - Limpasan dengan Metode NAM dan Sacramento pada Sub DAS Cikeruh, Jawa Barat Ika Sari Damayanthi Sebayang
FORUM MEKANIKA Vol 9 No 2 (2020): JURNAL FORUM MEKANIKA
Publisher : Sekolah Tinggi Teknik - PLN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33322/forummekanika.v9i2.1117

Abstract

Floods in the Cikeruh watershed often occur every year during the rainy season. In addition to the rainy season there are several other factors that influence, such as slope, land height, soil type and land use. With this study, it is expected to be able to provide information on the location of floods in the Cisadane watershed with the aim of helping to make decisions in carrying out actions, prevention, reducing the risk of flooding. The data used in this study are secondary data, namely the average annual rainfall data from 13 stations, soil type data, DEMNAS data (National Elevation Data Model), RBI maps with a scale of 1: 25,000 and Cisadane watershed maps. The method used in this study uses the scoring and overlay method where each parameter used to analyze the level of flood vulnerability in the Cisadane watershed is rainfall, slope, elevation, soil type, distance to the river (river buffer), and use land that is given a value and weight according to the classification of the level of vulnerability. Processing data in this study using ArcGis 10.2.2 software. The results of the study resulted in a map of flood vulnerability levels in the Cisadane watershed which provided information on the distribution of locations prone to flooding. Around 76.77% or 116,178,559 ha of the Cisadane watershed area is prone to flooding with a very high vulnerability to the level of medium vulnerability that is spread from upstream to downstream
Analisa Kinerja Ruas Jalan Demang Lebar Daun kota Palembang Chery Ade Putra; Farlin Rosyad
FORUM MEKANIKA Vol 9 No 2 (2020): JURNAL FORUM MEKANIKA
Publisher : Sekolah Tinggi Teknik - PLN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33322/forummekanika.v9i2.1120

Abstract

Jalan Demang Lebar Daun sebagai salah satu ruas jalan di Kota Palembang dengan volume lalu lintas yang cukup tinggi. Sepanjang ruas ini terdiri dari perkantoran, pusat perbelanjaan dan pusat jajanan, tetapi seiring dengan meningkatnya permintaan jasa transportasi, sehingga mengakibatkan terjadi kemacetan lalu lintas. Analisis kinerja ruas jalan diperlukan agar diketahui tingkat pelayanan ruas jalan Demang Lebar Daun dengan menggunakan Pedoman Kapasitas Jalan Indonesia (PKJI) 2014. Analisis menggunakan data primer yang berupa data jenis kendaraan, jumlah kendaraan dan kecepatan kendaraan dengan mengamati di lokasi penelitian dan data sekunder yang digunakan merupakan data kecepatan kendaraan tahun 2015 sampai dengan tahun 2019 yang diperoleh dari Badan Pusat Statistik (BPS). Pengamatan di lokasi penelitian dilaksanakan dalam satu minggu pada pagi dan sore hari. Berdasarkan hasil pengolahan dan analisis menunjukkan bahwa derajat kejenuhan rata-rata 0,83, kapasitas 3263 jam / jam dengan service level D.
Uji Marshall Immersion Pada Campuran AC-WC Menggunakan Rechlamed Asphalt Pavement (RAP) Tommy Iduwin; Dicki Dian Purnama; Ranti Hidayawanti
FORUM MEKANIKA Vol 9 No 2 (2020): JURNAL FORUM MEKANIKA
Publisher : Sekolah Tinggi Teknik - PLN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33322/forummekanika.v9i2.1123

Abstract

Using replacement materials in recent years is often used in research activities and also in construction activities. Reclaimed Asphalt Pavement (RAP) is an alternative material for use as a pavement material because it reduces the use of natural aggregates and new asphalt binders, which are needed to make asphalt mixtures. This research used a variation of RAP 0%, 25% and 35%. The test in reasearch is the Marshall test to determine the value of the optimum asphalt content and Marshall immersion. The mold of the test object used was a 3 x 4 inch cylinder with a total of 54 specimens. The results of the material characteristics test feel the 2018 highways specification standards. For the value of the Optimal Asphalt Content obtained for each variation is 5.4% for Rap 0%, 5.6 for Rap 25% and 6% for RAP 35%. In the marshall immersion test, the stability value of the remaining marshall after 24 hours of immersion was 91.4% for)% RAP, 90.7% for RAP 25% and 90.1% for RAP 35%. Keywords: AC-WC, RAP, Optimal Asphalt Content, Marshall Immersion
Pengaruh Limbah Slag Baja Terhadap Parameter Kuat Geser Tanah Dasar Dyah Pratiwi Kusumastuti; Muhammad Audito Alfansyah
FORUM MEKANIKA Vol 9 No 2 (2020): JURNAL FORUM MEKANIKA
Publisher : Sekolah Tinggi Teknik - PLN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33322/forummekanika.v9i2.1213

Abstract

Pembangunan prasarana transportasi yang terus dilakukan baik oleh pemerintah maupun swasta tidak seimbang dengan tersedianya lahan yang strategis. Hal ini yang menyebabkan pembangunan prasarana transportasi khususnya jalan raya, tak jarang berada di atas tanah dasar yang kurang baik. Tanah dasar yang kurang baik umumnya berjenis tanah lunak, tanah yang berbutir halus atau tanah yang memiliki kembang susut besar. Untuk mengatasi permasalahan tersebut, dilakukan perbaikan terhadap tanah dasar yang salah satu metodenya adalah stabilisasi dengan menambahkan bahan aditif seperti limbah slag baja. Penambahan slag baja pada tanah lunak akan ditinjau perubahan karakteristik fisik yaitu kadar air, berat jenis dan batas-batas konsistensi, serta perubahan karakteristik mekanik yaitu parameter kuat geser dari pengujian geser langsung. Berdasarkan hasil pengujian karakteristik fisik yaitu nilai kadar air, berat jenis dan batas-batas konsistensi tanah lunak mengalami penurunan seiring dengan penambahan slag baja dibandingkan tanah asli. Sedangkan untuk pengujian karakteristik mekanik yaitu nilai kohesi pada tanah lunak mengalami penurunan dan hal ini berbanding terbalik dengan nilai sudut geser dalam yang mengalami peningkatan seiring dengan penambahan slag baja pada tanah lunak.
Kuat Tekan Dan Porositas Beton Berpori Dengan Bahan Tambah Fly Ash dan Polyester Resin Abdurrazak Shahab; Ade Okviati Irlan; Ananto Nugroho
FORUM MEKANIKA Vol 9 No 2 (2020): JURNAL FORUM MEKANIKA
Publisher : Sekolah Tinggi Teknik - PLN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33322/forummekanika.v9i2.1223

Abstract

The development of concrete technology in the field of civil engineering is increasingly developing. Recently, many researchers have begun to pay attention to concrete without sand or what is commonly known as porous concrete. Porous concrete is lightweight concrete because there is no fine aggregate in the mixture, so the weight of porous concrete is usually lighter than ordinary concrete. There are constituent elements of porous concrete, namely coarse aggregate and cement. The purpose of this study was to determine the compressive strength and porosity value of porous concrete with polymer-added material in the form of polyester resin so that it could be a reference for the development of porous concrete. This research was conducted by using the compressive strength and porosity test method on the variation of the porous concrete mixture that was added with polyester resin when the concrete was 28 days old. Retrieval of data from the Trisakti University concrete laboratory, which then results in the form of compressive strength and porosity values. The results of this study will show the maximum value of compressive strength obtained from the variation of the 20% Polyester Resin Pore Concrete mixture (20% BPPR) of 24.98 MPa and the maximum value of porosity obtained from the variation of the Cement Pore Concrete mixture (BPS) of 18.04%. Keywords: Compressive Strength, Porosity, Polyester Resin
Angka Keamanan Piping di Bawah Tubuh Bendungan dengan Metode Harza Dyah Pratiwi Kusumastuti; Husna Alghoida
FORUM MEKANIKA Vol 10 No 1 (2021): JURNAL FORUM MEKANIKA
Publisher : Sekolah Tinggi Teknik - PLN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33322/forummekanika.v10i1.1266

Abstract

Abstract Dams have many benefits such as irrigation, flood prevention, power generation and even tourism, especially in areas where the dam is located. So that the benefits received can last a long time, in the planning, it must be analyzed for stability, seepage discharge that occurs and the safety of the piping. The piping hazard safety figures in this study were calculated using the Harza method for maximum water level conditions, normal water levels, fast receding and empty dams at sta 0 + 150, sta 0 + 200, sta 0 + 250 and sta 0 + 300. Based on the calculation results, it is found that the safety of piping hazards without filters with the grouting method do not meet the requirements safety factor, especially in conditions of maximum water level, normal water level and fast receding. In order for the safety of piping hazard in order to meet the requirements, a filter is applied under the dams. The filter is applied so that the piping hazard safety figure meets the requirements of all water level conditions and all station is 80 cm deep. Keywords: safety factor, piping, Harza method, filter ABSTRAK Bendungan memiliki banyak manfaat seperti irigasi, pencegah banjir, pembangkit listrik bahkan pariwisata khususnya pada wilayah dimana bendungan tersebut berada. Agar manfaat yang diterima dapat berlangsung lama maka dalam perencanaannya wajib dianalisis terhadap stabilitas, debit rembesan yang terjadi maupun keamanan dari piping. Angka keamanan bahaya piping pada penelitian ini dihitung dengan menggunakan metode Harza untuk kondisi muka air maksimum, muka air normal, surut cepat dan bendungan kosong di sta 0+150, sta 0+200, sta 0+250 serta sta 0+300. Berdasarkan hasil perhitungan didapatkan bahwa angka keamanan bahaya piping tanpa penggunaan filter dengan metode grouting tidak memenuhi persyaratan angka keamanan khususnya pada kondisi muka air maksimum, muka air normal dan surut cepat. Agar angka keamanan bahaya piping memenuhi persyaratan maka diaplikasikan filter dibawah tubuh bendungan. Filter yang diaplikasikan agar angka keamanan bahaya piping memenuhi persyaratan diseluruh kondisi muka air dan seluruh sta adalah dengan kedalaman 80 cm. Kata kunci: angka keamanan, piping, metode Harza, filter Abstract Dams have many benefits such as irrigation, flood prevention, power generation and even tourism, especially in areas where the dam is located. So that the benefits received can last a long time, in the planning, it must be analyzed for stability, seepage discharge that occurs and the safety of the piping. The piping hazard safety figures in this study were calculated using the Harza method for maximum water level conditions, normal water levels, fast receding and empty dams at sta 0 + 150, sta 0 + 200, sta 0 + 250 and sta 0 + 300. Based on the calculation results, it is found that the safety of piping hazards without filters with the grouting method do not meet the requirements safety factor, especially in conditions of maximum water level, normal water level and fast receding. In order for the safety of piping hazard in order to meet the requirements, a filter is applied under the dams. The filter is applied so that the piping hazard safety figure meets the requirements of all water level conditions and all station is 80 cm deep. Keywords: safety factor, piping, Harza method, filter ABSTRAK Bendungan memiliki banyak manfaat seperti irigasi, pencegah banjir, pembangkit listrik bahkan pariwisata khususnya pada wilayah dimana bendungan tersebut berada. Agar manfaat yang diterima dapat berlangsung lama maka dalam perencanaannya wajib dianalisis terhadap stabilitas, debit rembesan yang terjadi maupun keamanan dari piping. Angka keamanan bahaya piping pada penelitian ini dihitung dengan menggunakan metode Harza untuk kondisi muka air maksimum, muka air normal, surut cepat dan bendungan kosong di sta 0+150, sta 0+200, sta 0+250 serta sta 0+300. Berdasarkan hasil perhitungan didapatkan bahwa angka keamanan bahaya piping tanpa penggunaan filter dengan metode grouting tidak memenuhi persyaratan angka keamanan khususnya pada kondisi muka air maksimum, muka air normal dan surut cepat. Agar angka keamanan bahaya piping memenuhi persyaratan maka diaplikasikan filter dibawah tubuh bendungan. Filter yang diaplikasikan agar angka keamanan bahaya piping memenuhi persyaratan diseluruh kondisi muka air dan seluruh sta adalah dengan kedalaman 80 cm. Kata kunci: angka keamanan, piping, metode Harza, filter
Analisa Kebutuhan Ruang Pandangan Bebas Pada Perlintasan Sebidang Tanpa Palang Pintu Di Desa Gelam, Kabupaten Sidoarjo Nugroho Utomo
FORUM MEKANIKA Vol 10 No 1 (2021): JURNAL FORUM MEKANIKA
Publisher : Sekolah Tinggi Teknik - PLN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33322/forummekanika.v10i1.1272

Abstract

Railway crossing are amongst the most complex of road safety handling systems, due to the conflicts between road vehicles and rail infrastructure operations. Railway crossing until now is still become the one of major accident cause for road users. Mainly caused by indiscipline acts of road users when pass a railway crossing such as opening an illegal crossing, trespassing closed crossing gate and unaware road users. In the area that growing into an industrial and commercial area, the origins of road network that is local road type changed to collector road type. This roads transformation affected to appears of unprotected railway level crossings which existing railways and roads are closed to each other. In Province of East Java especially at Sidoarjo Municipality there are two railway crossing which indicating to this serious matters located at JPL 69 Gelam 1 and JPL 70 Gelam 2. These two railway crossing showing an incomplete standard safety facilities which required such as railway warning sign and others. By this urgency, paperwork is held to discussing about standard safety facilities identifications and analyzing availability of clear visible zone according with Guidance of Technically Design of Railway Crossing. As a results explained that JPL 69 Gelam 1 is not recommended for safety reasons and JPL 70 Gelam 2 is recommended with several conditions that must be equipped.
Penjadwalan Proyek Pembangkit Listrik Tenaga Surya (PLTS) Dengan Critical Path Method Irma Sepriyanna; Arif Suardi; Utami Wahyuningsih
FORUM MEKANIKA Vol 10 No 1 (2021): JURNAL FORUM MEKANIKA
Publisher : Sekolah Tinggi Teknik - PLN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33322/forummekanika.v10i1.1318

Abstract

Untuk memenuhi kebutuhan pasokan energi, tidak cukup hanya mengandalkan energi fosil sebagai sumber utama. Salah satu sumber energi terbarukan yang memiliki potensi besar di Indonesia adalah tenaga surya, yang dapat dimanfaatkan sebagai sumber utama pembangkit listrik tenaga surya (PLTS). Pelaksanaan pembangunan proyek PLTS dapat menjadi tugas yang rumit karena membutuhkan investasi waktu, biaya, dan tenaga kerja yang tidak sedikit. Masalah penjadwalan aktivitas adalah salah satu tugas penting yang harus dilakukan untuk pengendalian proses konstruksi dan perencanaan yang cermat sebelum dimulainya suatu proyek. Berkaitan dengan hal tersebut, penelitian ini mencoba menerapkan metode penjadwalan proyek pembangunan pembangkit tenaga surya terpusat off-grid, dengan metode jalur kritis (Critical Path Method). Hasil studi menunjukkan bahwa total waktu yang dibutuhkan untuk menyelesaikan proyek, berdasarkan penghitungan, menjadi 37 minggu jika tidak ada penundaan. Penerapan metode jalur kritis dapat memperbaiki jadwal yang digunakan sebelumnya dan hal ini akan membantu manajer proyek dalam menangani masalah agar penyelesaian proyek dapat dikerjakan tepat waktu
Pengaruh Variasi Jarak Tiang Bor Pada Tanah Lempung Terhadap Daya Dukung Dengan Metode Analisis Dyah Pratiwi Kusumastuti; Dearman Hasiholan Saragih
FORUM MEKANIKA Vol 10 No 1 (2021): JURNAL FORUM MEKANIKA
Publisher : Sekolah Tinggi Teknik - PLN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33322/forummekanika.v10i1.1357

Abstract

Letak lapisan tanah lempung kaku yang memiliki daya dukung cukup umumnya terletak pada kedalaman yang cukup jauh, sehingga pondasi tiang bor menjadi pilihan yang sering digunakan. Daya dukung pada kelompok pondasi tiang bor dipengaruhi oleh bahan pembentuk tiang, jarak antar tiang, banyaknya tiang yang digunakan dan susunan tiang. Variasi jarak yang digunakan pada kelompok tiang akan menyebabkan zona tegangan serta dapat menimbulkan keruntuhan tamah disekitar pondasi. Analisis efisiensi daya dukung kelompok tiang bor digunakan metode Converse Labarre dengan variasi jarak antar tiangbor yang digunakan adalah 2,5D dan 3D serta perhitungan penurunan menggunakan metode Vesic. Hasil penelitian dengan menggunakan diameter tiang 1 meter didapatkan efisiensi daya dukung pada jarak 2,5D dan 3,0D berturut-turut adalah 4721,851 ton dan 5057 ton. Berdasarkan hasil tersebut maka jarak 2,5D merupakan susunan kelompok tiang bor yang dipilih dengan penurunan sebesar 267,199 meter.
Pengaruh Air Mengunakan Reclaimed Asphalt Pavement Pada Campuran Beton Aspal Berdasarkan Uji Cantabro Dan Indirect Tensile Strength Tommy Iduwin; Devita Mayasari; Tri Yuhanah
FORUM MEKANIKA Vol 10 No 1 (2021): JURNAL FORUM MEKANIKA
Publisher : Sekolah Tinggi Teknik - PLN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33322/forummekanika.v10i1.1377

Abstract

The impact of RAP on water was identified to be analyzed for the material's resistance to water because there are still a lot of waterlogged pavements in Indonesia. This research uses RAP variation 0%, 25% and 35%. The test is the Marshall test to get the optimum asphalt content value, the Cantabro test to determine the weight loss for 300 rounds and the durability by varying the immersion 0.1, 2, 4 and 7 days which will be tested for ITS. The KAO value obtained for each variation is 5.4% for 0% Rap, 5.6 for 25% Rap and 6% for 35% RAP. The results of the Cantabro test show that the largest percentage of weight loss is a mixture of 35% RAP which is 12.54%, where for 0% RAP there is a weight loss of 10.85% and at 25% RAP there is a weight loss of 11.66%. ITS test results have the highest value with variations of RAP 0%, RAP 25% and RAP 35%. variations of 0%, 25% and 35% showed a decreasing trend until the 7th day of immersion, it can be said that in the three variations the ITS value was influenced by the duration of continuous immersion. Keywords: RAP, AC-WC, Marshall, Cantabro, Indirect Tensile Strength

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