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Program Studi Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan Jl. Amal Lama No.1 Kota Tarakan Kalimantan Utara
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Civil Engineering Scientific Journal
Published by Universitas Borneo Tarakan
ISSN : 29623308     EISSN : 29631335     DOI : https://doi.org/10.35334/cesj.v1i2
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture Engineering Mechanical Engineering
Civil Engineering Scientific Journal (CESJ) is a scientific journal published by the Civil Engineering Study Program, University of Borneo Tarakan. CESJ is a forum for civil engineering students to publish scientific works, research results, literature, and analytical studies that focus on the field of civil engineering. CESJ published three times a year (January, May, and September). The focus and scope of this journal are structural engineering, concrete & building material, transportation engineering, geotechnical engineering, water resources engineering & coastal engineering, construction engineering & management
Arjuna Subject : Teknik (semua kategori) - Teknik Sipil dan Struktur
Articles 91 Documents
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ANALISIS RESIKO K3 MENGGUNAKAN METODE HIRARC PADA PROYEK PEMBANGUNAN GEDUNG FAKULTAS KEDOKTERAN UNIVERSITAS BORNEO TARAKAN Ahmad Hernadi; Hana Ikhtiar; Noerman Prasetya
Civil Engineering Scientific Journal Vol 4, No 3 (2025): Civil Engineering Scientific Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/cesj.v4i3.7181

Abstract

ABSTRACT: The construction of the Faculty of Medicine building is one of the projects undertaken by the University of Borneo Tarakan to provide adequate facilities for students, lecturers, and staff in carrying out teaching and learning activities. Several factors contribute to the possibility of occupational accidents during constructions, including the state of the equipment and materials utilized, as well as weather and environmental circumstances. This study analyzed risks using the HIRARC (Hazard Identification Risk Assessment and Risk Control) method in the Faculty of Medicine building construction project at the University of Borneo Tarakan. Data were obtained from a risk assessment questionnaire completed by OHS experts, site foreman, and construction workers. The results of the analysis identified 31 hazards out of 34 potential hazards, with a Risk Priority Number (RPN) value of 3,710. Based on the AS/NZS 4360:2004 standard, the risk level for this project falls under the moderate risk level. Therefore, it is recommended that all hazard be controlled according to the hierarchy of controls, namely substitution, engineering controls, administrative measure, and the use of personal protective equipment (PPE).Keywords: Risk Analysis, Faculty of Medicine, HIRARC.ABSTRAK: Proyek pembangunan gedung Fakultas Kedokteran merupakan salah satu proyek pembangunan yang dilakukan oleh Universitas Borneo Tarakan dengan tujuan untuk menyediakan tempat yang memadai untuk para mahasiswa, dosen  maupun staff  Fakultas Kedokteran dalam melaksanakan proses belajar-mengajar. Dalam proses pembangunan terdapat beberapa faktor yang menyebabkan proyek pembangunan ini memiliki potensi risiko kecelakaan kerja diantaranya kondisi peralatan dan material yang digunakan serta kondisi cuaca dan lingkungan. Penelitian ini menganalisis risiko menggunakan metode Hazard Identification, Risk Assassment And Risk Control (HIRARC) pada Proyek Pembangunan Gedung Fakultas Kedokteran Universitas Borneo Tarakan. Data dari penelitian ini berasal dari penyebaran kuesioner penilaian risiko yang diisi oleh Ahli K3, Mandor, dan para pekerja sebagai respondennya. Hasil analisis menunjukkan terdapat 31 bahaya yang terjadi dari 34 potensi bahaya dengan nilai RPN sebesar 3.710. Sesuai dengan level risiko pada standar AS/NZS 4360:2004, maka nilai risiko pada proyek pembangunan gedung Fakultas Kedoteran Universitas Borneo Tarakan termasuk dalam kategori tingkat risiko sedang (moderate risk). Oleh karena itu, keseluruhan bahaya direkomendasikan untuk dilakukan upaya pengendalian sesuai dengan hirarki pengendalian yaitu subtitusi, rekayasa teknik, administrasi dan APD.Kata kunci: Analisis Risiko, Bahaya, Fakultas Kedokteran, HIRARC.
ANALISIS MENENTUKAN SISTEM STRUKTUR GEDUNG TAHAN GEMPA KABUPATEN BULUNGAN SESUAI SNI 1726-2019 Azis Susanto; Rival Araz
Civil Engineering Scientific Journal Vol 4, No 3 (2025): Civil Engineering Scientific Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/cesj.v4i3.6757

Abstract

ABSTRACT: Bulungan Regency which has a land area of 13.181,92 km2 (1.318.192 ha), according to the history of earthquakes, Bulungan Regency has experienced several earthquakes that occurred due to the shift of the Maratua Fault in Sulawesi sea waters which is close to Bunyu Island. Therefore, the analysis of determining the type of building structure, especially those to be built in Tarakan City, must meet the provisions of SNI 1726-2019. This research is an analysis of the types of structures in several existing buildings in Bulungan Regency, including school buildings (SMAN 1 Tanjung Selor, SMPN 1 Tanjung Selor and SDN 001 Tanjung Selor), office buildings (North Kalimantan Governor's Office, North Kalimantan Provincial Public Works Office and North Kalimantan Regional Library) and public service/worship/residential buildings (ASN Tanjung Selor Flats, Habib Ahmad Al Kaff Mosque and Tanjung Selor Main Market Shophouse). The main purpose of this study was to determine the types of seismic design categories (KDS) and building structural systems with the moment bearing frame system (SRPM) of the building which were reviewed in accordance with SNI 1726-2019. The results of the KDS and SRPM analysis on soft and moderate soil site parameters for all school buildings, office buildings and public service/worship/residential buildings in the researched buildings are D with the structural system permitted by SRPMK. For KDS and SRPM on hard soil site parameters Habib Ahmad Al Kaff Mosque is D with a structural system permitted by SRPMK, while for KDS and SRPM the SMAN 1 Tanjung Selor, SMPN 1 Tanjung Selor, SDN 001 Tanjung Selor, North Kalimantan Governor's Office, North Kalimantan Provincial Public Works Office, North Kalimantan Regional Library, ASN Tanjung Selor Flats, and Tanjung Selor Main Market Shophouse is C with a structural system permitted by SRPMM and SRPMK.Keywords:  Building, Bulungan Regency, SRPM, SNI 1726-2019  ABSTRAK: Kabupaten Bulungan yang memiliki luas daratan 13.181,92 km2 (1.318.192 ha), sesuai dengan sejarah terjadinya gempa, Kabupaten Bulungan sudah pernah mengalami beberapa kali gempa bumi yang terjadi akibat pergeseran Sesar Maratua di perairan laut Sulawesi yang dekat dengan Pulau Bunyu. Oleh karena itu analisis penentuan jenis struktur bangunan gedung terutama yang akan dibangun di Kabupaten Bulungan harus memenuhi ketentuan SNI 1726-2019. Penelitian ini, merupakan analisa jenis struktur pada beberapa bangunan yang sudah ada (eksisting) di Kabupaten Bulungan antara lain gedung sekolah (SMAN 1 Tanjung Selor, SMPN 1 Tanjung Selor dan SDN 001 Tanjung Selor), gedung perkantoran (Kantor Gubernur Kalimantan Utara, Kantor PU Provinsi Kalimantan Utara dan Perpustakaan Daerah Kalimantan Utara) dan gedung pelayanan umum/Ibadah/Hunian (Rusun ASN Tanjung Selor, Masjid Habib Ahmad Al Kaff dan Ruko Pasar Induk Tanjung Selor) Tujuan utama dari penelitian ini adalah untuk mengetahui Jenis Kategori Desain Seismik (KDS) dan sistem struktur bangunan dengan Sistem Rangka Pemikul Momen (SRPM) gedung yang ditinjau sesuai dengan SNI 1726-2019. Hasil analisis KDS dan SRPM pada parameter situs tanah lunak dan sedang untuk semua gedung sekolah, gedung perkantoran dan gedung pelayanan umum/Ibadah/Hunian pada gedung yang diteliti adalah D dengan sistem struktur yang diijinkan SRPMK. Untuk KDS dan SRPM pada parameter situs tanah keras Masjid Habib Ahmad Al Kaff adalah D dengan sistem struktur yang diijinkan  SRPMK, sedangkan untuk KDS dan SRPM Gedung SMAN 1 Tanjung Selor, SMPN 1 Tanjung Selor, SDN 001 Tanjung Selor, Kantor Gubernur Kalimantan Utara, Kantor PU Provinsi Kalimantan Utara dan Perpustakaan Daerah Kalimantan Utara, Rusun ASN Tanjung Selor dan Ruko Pasar Induk Tanjung Selor adalah C dengan sistem struktur yang diijinkan  SRPMM dan SRPMK.Kata Kunci:  Gedung, Kabupaten Bulungan, SRPM, SNI 1726-2019
PERKUATAN ELEMEN BALOK BETON BERTULANG MENGGUNAKAN MATERIAL CFRP : STUDI KASUS GEDUNG BANK Yanisfa Septiarsilia; Anditya Hendra Pratama; Jaka Propika; Indra Komara; Heri Istiono; Ahmad Hernadi
Civil Engineering Scientific Journal Vol 5, No 1 (2026): Civil Engineering Scientific Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/cesj.v5i1.7301

Abstract

ABSTRACT: The addition of floors and changes in building function can modify the load distribution and affect the capacity of structural elements, making it necessary to evaluate the existing structure to ensure that it can safely accommodate the new loading conditions. If the capacity is insufficient, strengthening is required, one method being the use of Carbon Fiber Reinforced Polymer (CFRP). This study includes the collection of existing structural data, structural modeling using analysis software, and the application of loads based on actual building conditions. The modeling results are used to assess the beam’s capacity under the additional loads, and if it does not meet the required strength, a strengthening system using CFRP is designed. In this research, an analysis was carried out on beam component B1 As 2-3 with a span length of 4.8 meters, considering an additional dead load from screed of 27.32 kN and an additional live load of 31.93 kN due to the functional change from office space to corridor. These added loads resulted in a new ultimate moment of 642.26 kNm, while the beam’s nominal moment capacity was only 530.29 kNm, indicating a required strengthening of at least 111.97 kNm. The analysis determined that three layers of CFRP were required, and with the CFRP installation, the new nominal moment capacity increased to 766 kNm, providing a total strength improvement of 44%.Keywords: Structural Strengthening, Beam Element, CFRP, Material, Reinforced Concrete. ABSTRAK: Penambahan lantai dan perubahan fungsi bangunan dapat mengubah distribusi beban dan kapasitas elemen struktur, sehingga diperlukan evaluasi untuk memastikan kemampuan struktur eksisting menahan beban baru. Bila kapasitas tidak mencukupi, perkuatan diperlukan, salah satunya menggunakan Carbon Fiber Reinforced Polymer (CFRP). Penelitian ini mencakup pengumpulan data eksisting, pemodelan struktur dengan bantuan perangkat lunak analisis struktur, serta penerapan pembebanan sesuai kondisi aktual. Hasil pemodelan digunakan untuk menilai kapasitas balok terhadap beban tambahan, dan jika tidak memenuhi syarat kekuatan, dirancang sistem perkuatan dengan CFRP. Pada penelitian ini dilakukan analisa komponen struktur balok B1 As 2-3 dengan panjang bentang 4.8 meter dengan penambahan beban mati akibat screed sebesar 27.32 kN dan beban hidup akibat perubahan fungsi ruang kantor menjadi koridor sebesar 31.93 kN. Dari penambahan beban tersebut didapatkan momen ultimate yang baru yaitu sebesar 642.26 kNm. Sedangkan momen nominal balok tersebut hanya sebesar 530.29 kNm, sehingga dibutuhkan perkuatan setidaknya sebesar 111.97 kNm. Dari hasil analisa didapatkan jumlah layer CFRP yang dibutuhkan yaitu sebanyak 3 layer, dengan penambahan CFRP didapatkan momen nominal yang baru yaitu sebesar 766 kNm. Dengan begitu didapatkan penambahan perkuatan sebesar 44%.Kata kunci: Perkuatan Struktur, Elemen Balok, CFRP, Material, Beton Bertulang.
STUDI EKSPERIMENTAL PENGARUH ABU SEKAM PADI SEBAGAI BAHAN TAMBAH PADA PAVING BLOCK TERHADAP KUAT TEKAN, DAYA SERAP AIR, DAN KETAHANAN GUNCANGAN Amal Ichlasul Magribi; La Ode Muhamad Fitnul; Adwan Bahar; Rahmat Natsir; Safrudin Safridin
Civil Engineering Scientific Journal Vol 4, No 3 (2025): Civil Engineering Scientific Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/cesj.v4i3.6747

Abstract

AbstractBased on SNI 03-0691-1996, paving block is a building material composition made from the mixture of Portland cement or similar hydraulic adhesives, water and aggregate with or without other additional material that will reduce the concrete quality. The burned rice husk ash will be used in this research. It aims to produce strong, environmental friendly and economical paving block. With the use of rice husk ash percentages as cement substitution are 5%, 10%, 15%, and 20%. The paving block mechanical characteristic test includes compressive strength, water absorption, and paving block shock resistance. This research is done at the designed age 7, 14, 21, and 28 of concrete. This result shows that the paving block with 5% of rice husk ash variation has compressive strength increased every designed paving block ages. Compressive strength test results are 32,85 Mpa, 37,92 Mpa, 39,55 Mpa, and 41,19 Mpa consecutively. Water absorption test resulted in an increased of paving block water absorption in every variation reach 6,77%, 7,32%,8,98%, 9,05%, and 9,30%. While for the shock resistance test did not increased with the adding of rice husk ash with the average blows are 4,33, 4,33, 4,33 and 4,67 blows every designed age until it caused the paving block cracked and broken.Key word: rice husk ash, paving block, compressive strength, water absorption, shock resistance.
PERANCANGAN STRUKTUR BETON BERTULANG BANGUNAN RUMAH SUSUN DI LAHAN BASAH KAWASAN KOTA BARU MANDIRI PROVINSI KALIMANTAN UTARA Rachel Zandra Singal; Ashabul Kahfi Bugis
Civil Engineering Scientific Journal Vol 5, No 2 (2026): Civil Engineering Scientific Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/cesj.v5i2.7600

Abstract

ABSTRACT: The structural design of reinforced concrete for multi-story buildings is a crucial stage in the building construction process, serving as part of the development of an efficient and well-planned residential area. The construction of vertical housing can serve as a residence for people who prefer a living concept featuring a more practical environment integrated within a single building. The planning of the vertical housing complex in the Kota Baru Mandiri (KBM) area represents the implementation of the North Kalimantan KBM Master Plan, which envisions the area as a hub for growth and development utilizing an integrated development system. The wetlands of KBM area requires special attention due to its wetland characteristics. Wetland sites generally exhibit low stability and bearing capacity; therefore, safe structural planning is essential to ensure the building's viability and durability. Structural design was conducted using SAP2000 V.25, a finite element method-based software capable of accurate and efficient three-dimensional structural modeling. Reinforced concrete is a composite material consisting of concrete and embedded steel reinforcement; while concrete possesses high compressive strength, it is weak in resisting tensile forces. The resulting structural design for the apartment building comprises columns measuring 60 x 60 cm; beams in three configurations (B1: 35 x 65 cm, B2: 25 x 40 cm, and B3: 12 x 25 cm); floor slabs with a thickness of 12 cm; and concrete with a strength grade of 33 MPa. The substructure design for the apartment building in the KBM wetland area specifies a pile depth of 30 meters and pile caps measuring 260 x 200 x 60 cm, utilizing 33 MPa concrete with stirrup and longitudinal reinforcement as specified in the design. Keywords: SAP2000, Wetlands, Independent New Town, Reinforced Concrete, Structural Modeling. ABSTRAK: Perencanaan struktur beton bertulang pada bangunan bertingkat adalah tahapan yang penting dalam proses pembangunan gedung sebagai pengembangan suatu kawasan hunian yang efisien dan terencana. Pembangunan rumah susun dapat berfungsi sebagai hunian bagi masyarakat yang memilih konsep hunian dengan lingkungan yang lebih praktis dan terintegrasi dalam satu bangunan. Perencanaan bangunan rumah susun di kawasan Kota Baru Mandiri (KBM) merupakan penerapan dari Master Plan KBM Kalimantan Utara sebagai pusat pertumbuhan dan pengembangan kawasan dengan sistem pembangunan yang terintegrasi. Lahan pada kawasan KBM menjadi perhatian khusus karena karakteristik lahan adalah lahan basah. Kondisi lahan basah pada umumnya memiliki kestabilan dan daya dukung yang rendah, sehingga perlu adanya perencanaan struktur yang aman untuk memastikan kelayakan dan ketahanan bangunan. Perencanaan struktur menggunakan SAP2000 V.25, yaitu software berbasis metode elemen hingga yang mampu melakukan pemodelan struktur tiga dimensi secara akurat serta efisien. Beton bertulang adalah material yang terdiri dari beton dan baja tulangan yang ada didalam beton. Beton bersifat sangat kuat dalam menahan kuat tekan tetapi lemah dalam menahan gaya tarik. Hasil perencanaan model struktur rumah susun adalah Kolom ukuran 60 x60 cm; Balok terdiri dari 3 model yaitu B1 ukuran 35 x 65 cm, B2 25 x 40 cm dan B3 12 x 25 cm; Plat Lantai ketebalannya adalah 12 cm; Mutu beton 33 Mpa. Perencanaan struktur bawah bangunan rumah susun pada lahan basah untuk kawasan KBM adalah kedalaman Tiang Pancang 30 meter, Pondasi Pilecap 260 x 200 x 60 cm; Mutu Beton 33 Mpa dengan tulangan sengkang dan tulangan longitudinal sesuai perencanaan. Kata kunci: SAP 2000, Lahan Basah, Kota Baru Mandiri, Beton Bertulang, Pemodelan Struktur.
ANALISIS TINGKAT KERUSAKAN GEDUNG PERPUSTAKAAN KOTA TARAKAN A FAUZI
Civil Engineering Scientific Journal Vol 5, No 2 (2026): Civil Engineering Scientific Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/cesj.v5i2.7633

Abstract

ABSTRACT :The current condition of the Tarakan City Library Building requires repair and maintenance efforts due to the building’s age, which has reached over a decade consequently, it has experienced various forms of demage that have the potential to disrupt user comfort. Therefire, building maintenance and upkeep activities need to be carried out periodically to ensure that the building’s facilities and infrastructure continue to function optimally and provide a sense of safety and comfort for users. This study was conducted to determine the extent of demaga occurring at the Tarakan City Library building and to provide recommendations for repairing the identified damage. The method used in this study was a quantitative approach through direct field observations to identify the types of damage occurring in the building and to measure the dimensions of the damage. The results of the study indicated that the percentage of damage levels in the Tarakan City Library Building For Structural components reached 17.60%, non-structural components reachend 6.94%, and the total damage level for the building reached 12.27%, falling within the category of minor damage. Additionally, recommendations for repairing cracks in structural elements such as columns, beams, and walls that have sustained damage include using a mixture of conbextra GP cement and water. Furthermore, for wall finishing work, it is recommended to repaint using durable paint. Meanwhile, damage to nonstructural components such as faucets, electrical installations, and door handles should be addressed by replacing these components with new ones to prevent further deterioration.Keywords : Tarakan city Library Building, Maintenance, Repair, Damage Level, and Repair Recommendations 
ANALISIS PERBANDINGAN PELAT KONVENSIONAL DAN FLAT SLAB TERHADAP PENGARUH KEKAKUAN STRUKTUR GEDUNG FAKULTAS ILMU KESEHATAN UNIVERSITAS BORNEO TARAKAN Nurlina Nurlina
Civil Engineering Scientific Journal Vol 5, No 2 (2026): Civil Engineering Scientific Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/cesj.v5i2.7634

Abstract

ANALISIS PERBANDINGAN PELAT KONVENSIONAL DAN FLAT SLAB TERHADAP PENGARUH KEKAKUAN STRUKTUR GEDUNG FAKULTAS ILMU KESEHATAN UNIVERSITAS BORNEO TARAKAN
STUDI BANGUNAN PELINDUNG PANTAI TIPE REVETMENT SEBAGAI ALTERNATIF PENANGANAN ABRASI DI PANTAI AMAL BARU KOTA TARAKAN Arin Isyamelya Maharani; Edy Utomo
Civil Engineering Scientific Journal Vol 3, No 3 (2024): Civil Engineering Scientific Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/cesj.v3i3.5900

Abstract

ABSTRACT: It is known that Amal Baru beach, Tarakan City has experienced 72% abrasion phenomenon and 28% accretion phenomenon with the condition of shoreline change due to abrasion reaching 2.59 meters per year, which causes heavy damage to the coastal area. One of the triggers that causes this abrasion phenomenon is changes in wave characteristics. One solution to protect the coast from abrasion and accretion is to build a revetment type of coastal protection building. This study aims to determine the value of the generated wave height and the value of the thickness of the protection layer as a reference in designing revetment type of coastal protection buildings utilizing several methods, namely, the Wilson Method used to analyze wave generation, the Admiralty Method used in tidal analysis, the Weibull Method used to analyze long-term wave predictions. The results of calculations of wave height and tides that have been carried out at Amal Baru Beach, Tarakan City for revetment type of coastal buildings, namely, for the main protection layer showed the peak width of the building reaching 1.76 meters and the thickness of the protection layer was 1.17 meters. The second protection layer used quarrystone with a grain weight of 2.435 meters and has a protection layer thickness of 0.21 meters. The core protection layer used quarrystone with a grain weight of 0.12 kg and had a protection layer thickness of 0.08 meters. Toe protection used quarrystone with a grain weight of 48.7 kg and has a toe protection width of 0.85 meters and a protection layer thickness of 0.57 meters.Keywords: Abrasion, Accretion, Coastal Building, Protection Layer, Beach, Revetment ABSTRAK: Diketahui bahwa di pantai Amal Baru, Kota Tarakan telah mengalami 72% fenomena abrasi dan 28% fenomena akresi dengan kondisi perubahan garis pantai akibat abrasi adalah 2,59 meter per tahun, yang menyebabkan kerusakan berat pada daerah pantai. Salah satu pemicu yang menyebabkan adanya fenomena abrasi ini adalah perubahan pada karakterisitik gelombang. Salah satu solusi untuk melindungi pantai dari abrasi dan akresi adalah dengan membuat bangunan pelindung pantai tipe Revetment. Penelitian ini bertujuan untuk mengetahui nilai tinggi gelombang yang dibangkitkan dan nilai ketebalan lapis lindung sebagai acuan dalam mendesain bangunan pelindung pantai tipe Revetment dengan menggunakan beberapa  metode yaitu, Metode Wilson digunakan untuk menganalisis pembangkitan gelombang, Metode Admiralty digunakan dalam analisis pasang surut, Metode Weibull digunakan untuk menganalisis prediksi gelombang jangka panjang. Hasil perhitungan dari tinggi gelombang dan pasang surut air laut yang telah dilakukan di Pantai Amal Baru Kota Tarakan untuk bangunan pantai tipe Revetment yaitu, untuk lapis lindung utama diketahui lebar puncak bangunan 1,76 meter dan tebal lapis lindung 1,17 meter. Lapis lindung kedua digunakan quarrystone dengan berat butir 2,435 meter dan memiliki tebal lapis lindung 0,21 meter. Lapis lindung inti digunakan quarrystone dengan berat butir 0,12 kg dan memiliki tebal lapis lindung 0,08 meter. Toe protection (pelindung kaki) digunakan quarrystone dengan berat butir 48,7 kg dan memiliki lebar pelindung kaki 0,85 meter serta tebal lapis lindung 0,57 meter.Kata kunci: Abrasi, Akresi, Bangunan Pantai, Lapis Lindung, Pantai, Revetment
SIMULASI HIDRAULIK ELEVASI MUKA AIR SALURAN RAWASARI MENGGUNAKAN HEC-RAS Aswar Amiruddin; Aneza Ferdani Widiyanti
Civil Engineering Scientific Journal Vol 4, No 1 (2025): Civil Engineering Scientific Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/cesj.v4i1.4951

Abstract

The Rawasari Channel is one of the channels in the West Tarakan Subdistrict that supplies water for the availability of water in the city of Tarakan. However, the Rawasari Channel sometimes experiences overflow during high rainfall intensity. The purpose of this research is to determine the water level in the Rawasari Channel through hydraulic simulation using HEC-RAS software. The repeated flood discharge periods used as parameters for this research are 50 years and 100 years, calculated using the Rational method. The flood discharge analysis results using the Rational method for a 50-year recurrence period are 21,098 m3/s, and for a 100-year recurrence period, it is 21,399 m3/s. Based on the HEC-RAS simulation, there is no significant difference in water surface elevations due to the 50 and 100-year floods. From the HEC-RAS simulation, it is also known that due to the flood discharge of 50 and 100 years, overflow occurs in the Rawasari Channel at stations STA 350, 325, 300, 150, and 125. The water surface elevation due to the 50-year flood at STA 350 is 20.38 m, and for STA 300, the water surface elevation for the 50-year flood is 20.29 m. The elevation of the land surface around STA 350 and STA 300 ranges from 19.99 m to 20.19 m, so the height of the inundation due to the overflow of the Rawasari Channel is known to be between 11 cm and 30 cm.Keywords: Flood, Rawasari Channel, HEC-RAS.Saluran Rawasari merupakan salah satu saluran di Kecamatan Tarakan Barat yang memberikan suplai air bagi ketersediaan air di Kota Tarakan. Namun Saluran Rawasari terkadang mengalami overflow saat intensitas hujan tinggi. Tujuan dari penelitian ini adalah mengetahui tinggi muka air di Saluran Rawasari melalui simulasi hidraulik menggunakan software HEC-RAS. Periode ulang debit banjir yang digunakan sebagai parameter aliran penelitian ini adalah 50 tahun dan 100 tahun yang dihitung menggunakan metode Rasional. Hasil analisis debit banjir metode Rasional untuk periode ulang 50 tahun adalah 21,098 m3/dtk, dan 21,399 m3/s untuk periode ulang 100 tahun. Berdasarkan simulasi HEC-RAS, tidak ada perbedaan signifikan antara elevasi muka air akibat banjir 50 dan 100 tahun. Dari simulasi HEC-RAS juga diketahui akibat debit banjir 50 dan 100 tahun terjadi overflow di Saluran Rawasari yakni pada STA 350, 325, 300, 150 dan 125. Elevasi muka air akibat banjir 50 tahun pada STA 350 sebesar 20,38 m dan untuk STA 300, elevasi muka air banjir 50 tahun 20,29 m, elevasi permukaan lahan sekitar STA 350 dan STA 300 berkisar antara 19,99 m – 20,19 m sehingga diketahui tinggi genangan akibat overflow Saluran Rawasari antara 11 cm - 30 cm. Kata kunci: Banjir, Saluran Rawasari, HEC-RAS
PENGARUH FLY ASH TERHADAP KUAT TEKAN BETON DENGAN TAMBAHAN SP 0.5% Natalia Natalia
Civil Engineering Scientific Journal Vol 4, No 1 (2025): Civil Engineering Scientific Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Borneo Tarakan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35334/cesj.v4i1.6563

Abstract

One of the materials most often used for building structural components is concrete. To produce quality concrete, you need to improve the quality of the constituent materials, such as the fineness of the cement and the hardness of the aggregate. Concrete can be made of higher quality by adding additional chemicals such as superplasticizers and fly ash, some of which can replace cement. The main objective of this research is to compare concrete mixtures and determine the compressive strength of concrete that has been added with superplasticizer, as well as to obtain the optimum fly ash content value for the compressive strength of concrete added with superplasticizer of 0.5% with fly ash substitution until it reaches a maximum value of 15%. . The maximum compressive strength of concrete containing a 15% fly ash mixture at 28 days is 388.57 kg/cm2. Based on this research, concrete with a 15% fly ash mixture has a maximum compressive strength of 372.43 kg/cm2, compared to normal 0% concrete of 388.57 kg/cm2, while for a 5% fly ash mixture it is 369.08 kg/cm2, and 371.37 kg/cm2 for 10% fly ash mixed concrete.Keywords: Concrete, Fly ash, Superplasticizer, Compressive Strength, VariationsSalah satu material yang paling sering digunakan untuk komponen struktur bangunan adalah beton. Untuk menghasilkan beton yang berkualitas adalah dengan meningkatkan kualitas bahan penyusunnya, seperti kehalusan semen dan kekerasan agregat. Beton dapat dibuat dengan kualitas lebih tinggi dengan menambahkan bahan kimia tambahan seperti superplasticizer dan fly ash yang sebagian dapat menggantikan semen. Tujuan utama penelitian ini adalah untuk membandingkan campuran beton dan mengetahui kuat tekan beton yang telah diberi bahan tambah superplasticizer, serta memperoleh nilai kadar fly ash optimum terhadap kuat tekan beton berbahan tambah superplasticizer sebesar 0,5% dengan subtitusi fly ash sampai mencapai nilai maksimum 15%. Kuat tekan maksimum beton yang mengandung campuran fly ash 15% pada umur 28 hari adalah 388,57 kg/cm2. Berdasarkan penelitian ini, beton dengan campuran fly ash 15% mempunyai kuat tekan maksimum sebesar 372,43 kg/cm2, dibandingkan beton normal 0% sebesar 388,57 kg/cm2, sedangkan untuk campuran fly ash 5% sebesar 369,08 kg/cm2, dan 371,37 kg/cm2 untuk Beton campuran fly ash 10%.Kata kunci: Fly ash, Superplasticizer, Kuat Tekan Beton

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