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All Journal REKA RACANA Journal of Civil Engineering Kohesi: Jurnal Sains dan Teknologi Bangunan
Kohar Yudoprasetyo
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation Other

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ANALISIS DEFLEKSI LATERAL DAN PENURUNAN PONDASI TIANG PANCANG BAJA PADA ABUTMENT JEMBATAN : STUDI KASUS JEMBATAN SEI ELLA 1 Kohar Yudoprasetyo; Moh. Fadhlan Rosyidi; Ifarrel Rachmanda Hariyanto; Naura Firdausi; Moh. Safi’i Mansur; Khansa Fadilah Ashara; Yosi Noviari Wibowo; Mohammad Akbar Alrasyidi
Kohesi: Jurnal Sains dan Teknologi Vol. 6 No. 9 (2025): Kohesi: Jurnal Sains dan Teknologi
Publisher : CV SWA Anugerah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.3785/kohesi.v6i9.10245

Abstract

This study aims to evaluate the performance of steel pile foundations for the abutment of the Sei Ella 1 Bridge, located at the Ela River, West Kalimantan, with soil conditions consisting of sedimentary layers. The analysis was conducted based on actual piling conditions, where pile depths vary between 4.015 meters and 5.823 meters. The evaluation includes calculating the single pile bearing capacity using the Decourt method, analyzing group pile capacity with the efficiency group approach, and assessing lateral deformation and settlement using the Finite Element Method (FEM). The results show that the single pile and group pile capacities are sufficient to withstand the loads from the superstructure, abutment self-weight, and lateral soil pressure. The lateral deformation analysis yielded a deflection value of 2.83 mm, while the settlement was recorded at 0.1152 mm. Both values are well below the maximum limit set by SNI 8460:2017, which is 12.5 mm, indicating that the foundation is in a safe and stable condition. This study provides a deeper understanding of the performance of steel pile foundations for the abutment of the Sei Ella 1 Bridge. As an additional verification step, it is recommended to conduct Static Loading Tests (compressive, tensile, and lateral) to validate the analysis results. This approach offers a robust foundation for ensuring the safety, stability, and feasibility of the design under actual conditions..
MODELING PULL-OUT BEHAVIOR OF THE DEFORMED REBAR EMBEDDED INSIDE THE REINFORCED CONCRETE Kohar Yudoprasetyo; Bambang Piscesa; Harun Alrasyid
Journal of Civil Engineering Vol. 37 No. 1 (2022)
Publisher : Institut Teknologi Sepuluh Nopember (ITS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v37i1.7623

Abstract

Abstract: This study presents the modeling of the pull-out behavior of deformed bars embedded inside the reinforced concrete element. The simulation uses an in-house finite element package called 3D-NLFEA. Sufficiently small solid elements that consider the frictional resistance and mechanical interlocking between the bar thread and the concrete matrix were used in the simulation. The effect of concrete compressive strength, cover thickness, and stirrup configuration on the pull-out capacity of the modeled specimens are investigated thoroughly. The modeling found out that the 3D-NLFEA package can capture the bond-fracture process at the interface between the bars and concrete. The fracture that occurs in the concrete was dominated by tensile splitting failure. The presence of stirrups that confined the concrete and restrained the crack propagation significantly influences the pull-out capacity, cracking pattern, and failure behavior at the bar interface with the concrete. The analysis results from 3D-NLFEA are also compared with the 3D-RBSM analysis results available in the literature. From the comparison between the two packages, it can be concluded that the analysis result from 3D-NLFEA is somewhat more conservative compared to the 3D-RBSM.
Evaluasi Kinerja Statik dan Fatik Dermaga Peti Kemas Eksisting Akibat Operasional Harbour Mobile Crane Jaya Via Dewata; Muhammad Sigit Darmawan; Afif Navir Refani; Moh. Fadhlan Rosyidi; Kohar Yudoprasetyo
RekaRacana: Jurnal Teknik Sipil Vol 12, No 2: Juli 2026
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/rekaracana.v12i2.115

Abstract

ABSTRAKDermaga Petikemas Tarakan yang telah beroperasi sekitar 20 tahun direncanakan menerima tambahan beban Harbour Mobile Crane (HMC). Penelitian ini mengevaluasi kinerja statik dan fatik struktur eksisting menggunakan data survei visual, Non-Destructive Test, core drill, pemodelan SAP2000, kurva Wöhler/S-N, dan aturan Palmgren-Miner. Kuat tekan minimum core drill 24,63 MPa digunakan sebagai parameter konservatif. Hasil statik menunjukkan balok dan pelat 450 mm memenuhi, sedangkan pelat 350 mm tidak memenuhi. Analisis fatik menunjukkan beton pelat 350 mm gagal dengan D = 5.443.281,091, sementara beton pelat 450 mm dan balok masih memenuhi dengan D masing-masing 0,6047 dan 3,177 × 10⁻⁸. Operasional HMC perlu dibatasi pada area yang memenuhi atau disertai redistribusi beban dan perkuatan lokal.Katakunci: analisis fatik, analisis statik, dermaga petikemas, Harbour Mobile Crane, Palmgren-Miner ABSTRACTThe 20-year-old Tarakan Container Wharf is planned to accommodate additional Harbour Mobile Crane (HMC) loading. This study evaluates the static and fatigue performance of the existing wharf by integrating visual inspection, Non-Destructive Testing, core drilling, SAP2000 modelling, Wöhler/S-N curves, and Palmgren-Miner damage accumulation. The minimum core compressive strength of 24.63 MPa was adopted as a conservative material parameter. Static evaluation indicates that the beams and 450 mm slab remain adequate, whereas the 350 mm slab is inadequate. Fatigue analysis shows that the concrete of the 350 mm slab fails with D = 5,443,281.091, while the 450 mm slab and beam satisfy the fatigue limit with D values of 0.6047 and 3.177 × 10⁻⁸, respectively. HMC operation should therefore be limited to acceptable areas or supported by load redistribution and local strengthening.Keyword: fatigue analysis, static analysis, container wharf, Harbour Mobile Crane, Palmgren-Miner
EVALUASI DAN PERKUATAN BETON BERTULANG STRUKTUR SILO KERUCUT Moh Fadhlan Rosyidi; Arsyad Susanto; Kohar Yudoprasetyo; Mohammad Akbar Alrasyidi
Bangunan Vol. 30 No. 2 (2025)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um071v30i22025p169-180

Abstract

Penelitian ini bertujuan untuk mendalami proses evaluasi perkuatan pada struktur kerucut silo yang mengalami kerusakan, dengan pendekatan teknis terhadap analisis perbaikan struktur. Fokus utama adalah pada silo berbentuk melingkar yang berbahan beton dengan sistem hopper menggunakan kerucut beton. Penilaian terhadap kualitas material dan kondisi struktur dilakukan melalui berbagai metode teknis, termasuk survei visual, pengujian non-destruktif seperti hammer test, Ultrasonic Pulse Velocity (UPV) test, dan rebar locator, serta pengujian destruktif berupa pengambilan sampel beton untuk pengujian kekuatan tekan di laboratorium. Analisis kapasitas struktur digunakan untuk menentukan properti material eksisting, yang menjadi dasar dalam simulasi teknis menggunakan metode elemen hingga. Struktur silo dimodelkan beserta beban dan pengaruh peningkatan suhu secara berkala yang mempengaruhi untuk mengevaluasi kapasitas tahanan momen dan risiko deformasi. Berdasarkan hasil analisis, ditemukan perlunya perkuatan tambahan pada struktur untuk meningkatkan kemampuan tahanan momen dan mengurangi potensi deformasi struktural yang dapat mengganggu integritas bangunan. Teknik-teknik perbaikan ini berpusat pada peningkatan daya tahan struktur melalui pendekatan teknis yang komprehensif.
Co-Authors Afif Navir Refani Akhmad Yusuf Zuhdy Arsyad Susanto Bambang Piscesa Ifarrel Rachmanda Hariyanto Ifarrel Rachmanda Hariyanto Jaya Via Dewata Khansa Fadilah Ashara Moh Fadhlan Rosyidi Moh. Fadhlan Rosyidi Moh. Safi’i Mansur Mohammad Akbar Alrasyidi Muhammad Sigit Darmawan Naura Firdausi R. Sri Martiningsih Ragil Purnamasari Rufi'i Yosi Noviari Wibowo