Fajar Prihesnanto’s scientific contributions

Connection in reinforced concrete is unavoidable due to limited length of steel. As known the maximum length of steel 12 metres and used for beams, columns, plates, foundations, etc. Sometimes several buildings use long spans between column to column for architecture causes longer steel needs. If spans are more than 12 metres the steels should be connected by welding, coupler drates, and other parts of connection. Coupler drates one of the most popular connection and it is easy to make connection between steels in the reinforcement concrete. This research aims to determine the behaviour of steels when they were tensioned at testing machine either full steel bar and connected steel bar by coupler drates. The testing was conducted at the materials laboratory the references for testing are Indonesian standards for testing materials like SNI - 2052 - 2017, SNI - 8389 - 2017 and SNI - 07 - 0408 - 1989. The type of steel bars for testing are drate steels of diameters 25 mm and 32 mm and the type of test is tensioning test. The results of testing for normal steel bar of D- 25 mm is 619.3 MPa and D-32 mm is 636 MPa respectively and steel bar with coupler drates for D- 25 mm is 428 MPa and D-32 mm is 522.5 MPa respectively. It means tension strength of D-25 mm coupler drates decreases 30.88 % and tension strength of D-32 mm decreases 17.84 % as compared with steel bars.

Kecamatan Muara Gembong Kabupaten Bekasi Provinsi Jawa Barat banyak dijumpai jalan yang rusak dan bergelombang. Wilayah ini merupakan pesisir laut dan beberapa bagian wilayahnya merupakan tanah rawa yang memiliki kuat dukung yang rendah, tidak memenuhi kuat dukungyang dipersyaratkan yaitu CBR minimum 6%. Penelitian ini bertujuan untuk menganalisis pengaruh penambahan abu serbuk kayu dan serbuk cangkang kerang sebagai material stabilisasi tanah terhadap kuat dukung, dalam hal ini yaitu nilai California Bearing Ratio. Metode yang digunakan pada penelitian ini yaitu eksperimen laboratorium stabilisasi tanah lunak yang dicampurkan dengan material aditif berupa abu serbuk kayu dan serbuk cangkang kerang pada proporsi 2% dan 4% terhadap berat kering tanah. Pengujian yang dilakukan meliputi uji batas Atterberg, pemadatan, dan CBR kondisi tidak terendam. Hasil analisis menunjukkan bahwa tanah yang dicampur dengan 4% serbuk cangkang kerang tanpa abu serbuk kayu mengalami peningkatan nilai CBR sebesar 84.32% terhadap CBR tanah asli. Tanah yang dicampur dengan serbuk cangkang kerang dan abu serbuk kayu juga mengalami peningkatan kuat dukung namun tidak sebaik tanah yang dicampur dengan serbuk cangkang kerang saja.

The implementation of community service carried out in Bantarsari Village is related to the Role of the Village Government in Addressing Nutrition Improvement. In carrying out the service, it uses community education methods in the form of counseling. Community service was carried out for a month at the location in Kampung Pulo Kecil in Bantarsari Village. The results of the service implementation show that the community, especially parents, don’t know and don’t understand the ways and steps to prevent and minimize stunting, increase community enthusiasm to maintain a healthy lifestyle and good parenting, increase awareness of the child's growth process. The role of government is very important in overcoming nutrition problems, and the need for cooperation and support from government officials to achieve the goal of improving optimal nutrition starts from an early age. In the health services provided, such as services for pregnant women, health for babies, children and others. Apart from providing good nutrition for children, parents also need to have sufficient knowledge and maintain a healthy and well-developed body so that they can prevent nutritional health problems, namely stunting.

Road construction on expansive soil faces many problems such as deflection, longitudinal cracks, circular cracks and spreading cracks in road construction due to the large nature of swelling and shrinkage. This study aims to identify changes in the mineralogy microstructure and chemical properties of the soil in chemically corrected expansive soils so that solutions for expansive soil improvement are obtained by utilizing local materials based on industrial waste, namely Fly ash and Waste Foundry Sand. The research method is in the form of laboratory experiments, namely Structure Electron Microscope and XRD tests on native soil and soil stabilized with Fly ash and Waste Foundry Sand to analyze mineral structure and chemical changes. The results of the analysis found that the effect of the two types of additives on expansive soils was descriptively significant. The addition of fly ash and WFS to the soil makes the pores and cracks filled with fly ash particles and some form of hydration. After the addition of Fly ash and WFS, ion exchange and pozzolanic reactions from fly ash occur to make the flake and flocculant structure of the soil cement into a crystal or block structure, thereby increasing the compactness and integrity of the soil sample.

Purpose: The 2023 Global Sustainable Development Report will be launched as the world approaches the half-way point of the 2030 Agenda and struggles to rebuild in the aftermath (or in the midst) of the COVID-19 pandemic. Compare the document counts for up to 15 sources, year 2020 until 2021, there are increase of documents based on Sustainable Development Goals (SDGs), Socio Education documents published in SCOPUS.COM. Subject area dominant is Social Sciences, followed by Environmental Science, Medicine. Design/methodology/approach: Source Documents dominant is International Journal Of Emerging Technologies In Learning, followed by Sustainability Switzerland, E3s Web Of Conferences, and Lancet. There are no Indonesia journal. By country or territory, Nigeria, United Kingdom, and India dominant in the World. In Malaysia, very strong, followed by Viet Nam, Indonesia, Philippines, Singapore, Myanmar, and Thailand. By funding sponsor, dominant Bill and Melinda Gates Foundation, followed by Covenant University, Covenant University Centre for Research, Innovation and Discovery, European Commission, and Fundação para a Ciência e a Tecnologia. There are no Indonesia funding sponsor. By affiliations, dominant James Cook University, followed by Organisation Mondiale de la Santé, Lunds Universitet, and University of Cape Coast Ghana. There are no Indonesia affiliations. Compare the document counts for up to 15 sources, year 2020 until 2021, there are increase of documents based on Sustainable Development Goals (SDGs), Socio Environment documents published in SCOPUS.COM. Findings: Subject area dominant is Social Sciences, followed by Environmental Science, Energy. Source Documents dominant is Energy Reports journal, followed by Sustainability Science journal, International Organisations Research Journa, Smart Innovation Systems And Technologies journal, and Sustainability Switzerland journal. There are no Indonesia journal. By country or territory, United Kingdom dominant, followed by South Africa and Nigeria. In ASEAN dominant Indonesia and Malaysia. By funding sponsor, Bill and Melinda Gates Foundation dominant, followed by Bundesministerium für Bildung undForschung, Centre for International Forestry Research, European Commission, and European Social Fund. None from Indonesia. By affiliations, University of KwaZulu-Natal dominant, followed by Dokuz Eylül Üniversitesi, South African Water Research Commission, University of Venda, and Russian Presidential Academy of National, from Indonesia there is Universitas Indonesia, Universitas Indonesia, 29,793 documents, whole institution, 28,845 documents, affiliation only, 17,394 Authors, Document count (high-low), Medicine 7,069 docs, Engineering 5,685 docs, and Physics and Astronomy 5,145 docs. Universitas Indonesia research publication connected with Sustainable Development Goals (SDGs), Socio Environment. Paper type: Research paper

The Swamp Irrigation Area (DIR) of Dadahup District is a former Peat Land Development (PLG) with an area of around 21,226 Ha. The water management system at DIR Dadahup utilizes changes in sea tides as a source of water to the land and drainage to drain water out of the land. However, in its implementation, DIR Dadahup experienced several problems such as flooding during the rainy season and experiencing drought during the dry season. These conditions indicate the need for land management and water management systems to overcome existing problems. The purpose of this study was to optimize the water management system for irrigation by optimizing the functions and benefits of swamp land in Dadahup, Kapuas Regency, Central Kalimantan Province. Optimization of the water system is carried out by modeling using the HEC-RAS program. Flow modeling with HEC-RAS in irrigation canals can be simulated into two scenarios, namely scenarios using gates and scenarios with doors and pumps for the rainy and dry seasons. Based on the results of the modeling analysis that has been carried out, the surface elevation during the dry season is in the range of +0.06 ms/d + 0.77 m, which is below the average land elevation (+0.8 m MSL). experience drought because the water in the canals cannot irrigate the land. The water level during the rainy season is in the range of +0.82 ms/d +1.53 m, which is above the average land elevation. It can be concluded that irrigation canals cannot accommodate the overflow of water that occurs at the planned discharge so that the land is flooded. The scenario model is suitable for the Dadahup DIR land use, namely with the door and pump scenario, the water level elevation for the dry season and the rainy season can reach the target of +1.0 m, then the water level elevation for the rainy season can also reach the target of +0, 7m.

This activity aims to provide services and information to the manager of the Nuurus Sa'ada mosque in assessing the compressive strength of the concrete at the renovation of the Nurus Sa'ada Tangerang mosque as a quality control for the building being renovated. The method of activity is to do the Hammer test at several points in the Mushola area such as the floor plate and column structures. This activity involved lecturers in Universitas Islam 45, Faculty of Engineering, Universitas Islam 45 Civil Engineering laboratory assistants, and the manager of the Nurus Sa'ada mosque, as well as renovation implementers. Key words: Hammer Test, Mushola Renovation, Compressive Strength, Mosque Abstrak Kegiatan ini bertujuan untuk memberikan pelayanan dan informasi kepada pengelola mushola Nuurus Sa’ada untuk menilai kuat tekan beton pada renovasi mushola Nurus Sa’ada Tangerang sebagai kontrol kualitas bangunan yang sedang direnovasi. Metode kegiatan yaitu dengan melakukan pengujian Hammer test di beberapa titik area Mushola seperti pada struktur plat lantai dan kolom. Kegiatan ini melibatkan para dosen di lingkungan Fakultas Teknik Universitas Islam 45, laboran Teknik Sipil Universitas Islam 45, dan pengelola Mushola Nurus Sa’ada, serta pelaksana renovasi. Kata kunci: Hammer Test, Renovasi Mushola, Kuat Tekan, Beton

Ketersediaan petak parkir di Universitas Islam 45 Bekasi pada saat ini tidaksebanding dengan bertambahnya jumlah mahasiswa yang membawa motor karenaketerbatasan luas lahan parkir yang tersedia, salah satu alternatif pemecahannya adalahdengan membangun gedung parkir.Perencanaan gedung parkir ini dianalisis dengan metode analisa statik ekuivalen.Hasil dari analisis berupa aksial, momen, geser. Analisis beban dorong statik pada strukturgedung, dengan menggunakan cara analisis statik 2 dimensi, linier dan non linier, dimanapengaruh gempa rencana terhadap struktur gedung dianggap sebagai beban-beban statikyang menangkap pada pusat massa masing-masing lantai, yang nilainya ditingkatkan secaraberangsur angsur sampai melampaui pembebanan yang menyebabkan terjadinya pelelehan(sendi plastis) pertama di dalam struktur gedung, kemudian dengan peningkatan bebanlebih lanjut mengalami perubahan bentuk elastis plastis yang besar sampai mencapaikondisi di ambang keruntuhan. Kemudian menentukan pemilihan dimensi balok portalutama pada portal dan balok anak terhadap momen pada balok portal akibat gaya-gayayang bekerja pada struktur gedung parkir tersebut.Berdasarkan hasil penelitian tersebut dapat disimpulkan: (1) Lantai 1, 2 dan 3dibutuhkan balok anak sebanyak 60 x 3 batang menggunakan profil WF 250 x 125 x 6 x 9,elemen portal balok WF 300 x 300 x 10 x 15 sebanyak 56 x 3 batang, WF 500 x 200 x 10 x 16sebanyak 30 x 3 batang dan WF 200 x 200 x 8 x 12 sebanyak 8 x 3 batang, dan kolom WF400 x 400 x 13 x 21 sebanyak 55 x 3 batang. (2) Lantai 4 (empat) dibutuhkan kolom WF 350x 350 x 12 x19 sebanyak 22 batang. Profil aman terhadap momen, geser, dan defleksi.

Seiring dengan bertambahnya usia bangunan maka ada penurunan dari kapasitas struktur sehingga dimungkinkan lendutan dan retak pada komponen struktur bertambah besar. Begitu pula permasalahan lendutan pelat lantai yang terjadi pada gedung Rektorat Universitas Islam “45” Bekasi menyebabkan pengguna bangunan menjadi tidak nyaman. Agar besar lendutan yang terjadi tidak bertambah parah maka perlu adanya solusi perbaikan. Pemecahan permasalahan yang terjadi dilakukan melalui survei lapangan untuk mengetahui besarnya lendutan yang terjadi, melakukan analisis kekuatan pelat dalam menahan beban dengan program SAP2000 berdasarkan peraturan SNI 03-2847-2002 dan menghitung perkuatan struktur lentur yang diperlukan oleh pelat dan balok berdasarkan metode LRFD yang berpedoman pada peraturan SNI 03-1729-2002. Hasil perhitungan terdapat 5 lokasi pelat yang mengalami penurunan dengan besar masing-masing pelat yaitu 5,3 cm; 6,8 cm; 8 cm; 6,9 cm dan 10,9 cm. Kemudian besar beban maksimal yang masih dapat bekerja untuk pelat II yaitu 350 kg, untuk pelat IV yaitu 300 kg, untuk pelat V yaitu < 240 kg. Jenis dan dimensi perkuatan yang digunakan pada pelat adalah profil baja WF 125 x 60 BJ 37, sedangkan pada balok yaitu profil baja WF 150 x 150 BJ 37. Kata Kunci: lendutan, beban maksimal, perkuatan struktur.

Dalam sebuah proyek konstruksi, perkiraan biaya memegang peranan penting dalam penyelenggaraan proyek. Untuk meningkatkan efisiensi dan efektivitas kegiatan pembangunan gedung dan bangunan di bidang konstruksi, diperlukan suatu sarana dasar perhitungan harga satuan yaitu Analisa Biaya Konstruksi. Kontraktor umumnya membuat harga penawaran berdasarkan analisa yang tidak seluruhnya berpedoman pada analisa BOW (Burgelijke Openbare Werken) maupun analisa SNI (Standarisasi Nasional Indonesia). Para kontraktor lebih cenderung menghitung harga satuan pekerjaan berdasarkan dengan analisa mereka sendiri yang didasarkan atas pengalaman terdahulu dalam menyelesaikan suatu pekerjaan konstruksi, walaupun tidak terlepas dari analisa BOW dan SNI. Metode penelitian dalam melakukan analisa Rencana Anggaran Biaya (RAB) yaitu dengan BOW, SNI dan Metode Perhitungan Kontraktor. Dari perhitungan masing-masing analisa rencana anggaran biaya yang ada, didapat perbandingan rencana anggaran biaya antara metode BOW, SNI dan Metode Perhitungan Kontraktor. Rencana anggaran biaya yang ekonomis dengan menggunakan Metode Perhitungan Kontraktor yaitu sebesar Rp 9.846.278.000,- sementara hasil analisa rencana anggaran biaya BOW yaitu sebesar Rp 13.591.871.000,- sedangkan analisa rencana anggaran biaya SNI yaitu sebesar Rp 12.836.347.000,- Kata kunci: RAB, BOW, SNI, Metode Perhitungan Kontraktor dan Harga Satuan Pekerjaan