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All Journal Paduraksa : Jurnal Teknik Sipil Universitas Warmadewa Kurva S : Jurnal Keilmuan dan Aplikasi Teknik Sipil Dinamika Bahari: Journal of Maritime Dynamic Jurnal Ekologi, Masyarakat dan Sains Bulletin of Computer Science and Electrical Engineering (BCSEE) SELODANG MAYANG Journal of Metallurgical Engineering and Processing Technology Teknik: Jurnal Ilmu Teknik dan Informatika International Journal of Advanced Science and Computer Applications Jurnal Sintesis: Penelitian Sains, Terapan dan Analisisnya Jurnal Rivet: Riset dan Invensi Teknologi Journal of Innovation Research and Knowledge Elektriese: Jurnal Sains dan Teknologi Elektro Nusantara Civil Engineering Journal Media Bina Ilmiah Journal of Railway Transportation and Technology OKTAL : Jurnal Ilmu Komputer dan Sains Journal of Research and Inovation in Civil Engineering as Applied Science Journal of Science and Education Research Sainstech Nusantara Research of Scientia Naturalis
Aco Wahyudi Efendi
Civil Engineering, Faculty Of Engineering, Tridharma University Balikpapan
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Transportation Other

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Analysis Surface Structure Improvement of Runway Threshold 07-25 Using FAARFIELD EFENDI, ST., MT, Ir.ACO WAHYUDI
Teknik: Jurnal Ilmu Teknik dan Informatika Vol 1 No 2 (2021): Oktober : Teknik: Jurnal Ilmu Teknik dan Informatika
Publisher : LPPM Sekolah Tinggi Ilmu Ekonomi - Studi Ekonomi Modern

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51903/teknik.v1i2.56

Abstract

Runway or runway is an area used by aircraft to take off. The length of the runway depends on the size of the aircraft served. Runway has a pavement structure that can withstand the weight of an aircraft when it wants to fly. This study discusses the damage to the surface structure of the Threshold 07 and Threshold 25 runways at the Sultan Aji Muhammad Sulaiman (SAMS) runway in Sepinggan Balikpapan. Damage to the pavement surface often results from significant heat temperatures from the aircraft when taking off. Visual observations show that there are problems with the Threshold 07 and Threshold 25 pavement surfaces, the damage that occurs is the change in the surface shape of some segments, where the surface deformation eleves are up to 40 mm. Test results from Coredrill samples show that there are internal problems in the asphalt mixture, namely high asphalt content and low density value. By looking at the conditions above, there are problems caused by external and internal factors of the existing pavement, especially the surface conditions namely Threshold which is a location where the load is in MTOW conditions and the aircraft is moving slowly as well as high temperatures (environment and pavement)
Noise exposure impact zone hue modeling using LISA FEA V.8 EFENDI, ST., MT, Ir.ACO WAHYUDI
Teknik: Jurnal Ilmu Teknik dan Informatika Vol 2 No 2 (2022): Oktober : Teknik: Jurnal Ilmu Teknik dan Informatika
Publisher : LPPM Sekolah Tinggi Ilmu Ekonomi - Studi Ekonomi Modern

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51903/teknik.v2i3.153

Abstract

This study aims to obtain data on the impact of noise pollution by conducting a noise test from the operation of the PLTD and modeling it to get the noise impact hue. Finite element software modeling the impact of noise generated from the operation of PLTD to determine the hue of the noise impact. LISA, a popular finite element analysis application, was used to estimate and complete this study using the finite element model. Noise data retrieval, some data is carried out according to the engine power load during production and the machine stops with a certain distance reference to the affected area, namely residential areas, with a zone radius of up to 100 m from the machine point. The condition of the impact of noise exposure that occurs, where in general the area that has a major impact on settlements is a linear area of openings at the noise source because noise waste is free to come out of building openings without any obstacles. , so that the nominal sound impact that occurs without these obstacles, the average noise value is above the 70 dB.A threshold with the category of very disturbing.
FORENSIC INVESTIGATION Of THE SAMARINDA IBU dan ANAK HOSPITAL BUILDING: STRUCTURAL SETTLEMENT ANALYSIS Efendi, Aco Wahyudi
JURNAL RIVET Vol 4 No 02 (2024): Desember 2024
Publisher : Program Studi Teknik Sipil

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47233/rivet.v4i02.1678

Abstract

In initiatives to enhance the quality of infrastructure, especially with regard to building stability and the avoidance of structural failure, the safety and comfort of visitors has taken center stage. In order to improve infrastructure, older or decaying buildings are frequently reinforced or renovated. This may entail repairing accumulated damage without requiring total demolition. In order to guarantee the structure's dependability and safety, these remodeling initiatives require careful assessment and study. Concerns over apparent settlement of the Ibu dan Anak Hospital building in Samarinda have been brought up, highlighting the significance of assessing structural integrity to guarantee ongoing safety and functionality. The purpose of this study is to conduct a thorough structural audit of the building in order to find any possible hazards and suggest any necessary improvements. The study assessment the building's stability and forecasts future settlement by simulating its behavior under various circumstances, including dynamic and static load scenarios, using sophisticated modeling software such as GEOSLOPE-GEOSTUDIO (Student Version). According to the aforementioned analytical results, there are signs that the hard soil layer is not reached by the pile depth, which causes settlement. Over the course of the following year, the settlement increased from 15.89 cm in the first 178 days to 17.64 cm. The analysis indicates that the settlement will stay at 31.65 cm for the next five years, therefore after 1,780 days, it is deemed stable.
Structural Assessment of Mahakam Bridge Geometry Using Geodetic GPS and Terrestrial Laser Scanner Wahyudi Efendi, ST., MT., ASEAN Eng., ACPE., APEC Eng., Ir. Aco
SAINSTECH NUSANTARA Vol. 2 No. 1 (2025): February 2025
Publisher : Nusantara Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71225/jstn.v2i1.87

Abstract

This study employs a terrestrial laser scanner and geodetic GPS to assess the camber elevation, lateral drift, and pilecap inclination of the Mahakam I Bridge in Samarinda, East Kalimantan. The camber inspection results reveal variations in the elevation of spans B3, B4, and B5, with the lowest measured at 68.74 m and the highest at 70.35 m. The lateral drift analysis on piers P2, P3, and P4 indicates minimal displacements, with maximum deviations ranging from -0.05% to 0.29%. The inclination angles of the pilecaps on P2, P3, and P4, measured at 90.411˚, 90.128˚, and 90.112˚, respectively, exhibit slight deviations from the optimal 90˚ alignment. These findings highlight the need for continuous monitoring and potential structural adjustments. The study underscores the critical role of precise geometric assessment in preserving bridge integrity and ensuring long-term structural stability. Further investigations and mitigation strategies are recommended to prevent potential risks and deterioration.
Identification of damage and assessment of the jetty using Non destructive method (NDT) Efendi, Aco Wahyudi
Dinamika Bahari Vol 6 No 1 (2025): May 2025 Edition
Publisher : Politeknik Ilmu Pelayaran Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46484/db.v6i1.750

Abstract

A pier is a port building used for anchoring and mooring ships carrying out loading and unloading of goods and loading and unloading of passengers. This research was conducted to obtain information about the feasibility of a jetty. From the visual results of the dive team's survey, it shows that corrosion occurs from the surface of the high tide to the surface of the riverbed, this can be seen from some of the documentation that there is a porous surface of steel pipe piles. In steel pipe, 56.25% (thickness less than 12 mm) of the 16 piles indicated that they were porous and loose which, in the reduction of the thickness of the steel pipe. About 43.75% (thickness more than 12 mm) is weathered so that its dimensions have increased in thickness of steel pipe dimensions. For pile integrity, the results obtained are 33.34% pile integrity less than 60% from 15 test points, 33.34% integrity from 60-79% from 15 test points, 6.67% integrity from 80-99% from 15 test points, 20% of the 15 test points failed. The current condition of the wharf is weakened due to natural conditions as well as due to age and service load, therefore a decrease in capacity affects the behavior of the pier so that the collision that occurs causes a very high vibration cycle.
Behavior Collapse Investigation of A Steel Sheet Pile with LISA FEA V8 Wahyudi Efendi, ST., MT., ASEAN Eng., ACPE., APEC Eng., Ir. Aco
SAINSTECH NUSANTARA Vol. 2 No. 2 (2025): May 2025
Publisher : Nusantara Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71225/jstn.v2i2.110

Abstract

The collapse of the Tank Area embankment led to the failure of the steel sheet pile installed on the west side of the planned position. Evidence suggested that the installation process of the sheet pile induced vibrations, which may have contributed to the failure. This study aimed to investigate the actual behavior of the failure through reverse analysis and finite element modeling techniques. These analyses helped identify the causes of the failure and provided reinforcement recommendations for improving the current condition. The findings revealed that the existing state, when evaluated with the current soil parameters, was prone to failure. During the land clearing process, a slip plane formed, resulting in a safety factor (SF) of 0.036. Despite the installation of the sheet pile, the condition continued to deteriorate due to significant lateral soil pressures, causing the sheet pile to collapse. However, when the SF increased to 1.431, which exceeds the necessary SF of 1.2, the stability of the sheet pile improved, and the value approached a stable limit of 0.984. Based on these findings, recommendations are made to enhance the stability and prevent further risks and deterioration.
Investigation for Collapsed Navigation Structures in The Mahakam River Delta by Bathymetry and Sonar Efendi, Aco Wahyudi
JURNAL RIVET Vol 5 No 01 (2025): Juni 2025
Publisher : Program Studi Teknik Sipil

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47233/rivet.v5i01.2062

Abstract

This study employed an integrated approach of side-scan sonar imaging and bathymetric surveying to precisely locate and characterize collapsed navigation structures within the dynamic Mahakam River Delta. This crucial waterway faces environmental challenges like strong currents and heavy siltation, threatening navigational aid integrity. Accurate identification of these submerged hazards is vital for safe shipping and future infrastructure development. Our findings demonstrated the effectiveness of combining these hydrographic methods to accurately map the seafloor and detect anomalies indicative of collapsed structures. Visual diving confirmed extremely poor underwater visibility, necessitating remote sensing. High-resolution bathymetric surveys successfully identified distinct riverbed anomalies, notably a collapsed structure at 00°50'13.29" S / 117°18'24.51" E, exhibiting a 1-1.5 meter elevation change at 4.5 meters depth. Acoustic data supported its man-made origin. These critical findings directly informed recommendations for repositioning affected navigation aids to a safer location at 00°50'16.29" S / 117°18'24.59" E, thus providing essential data for maritime safety and infrastructure management in complex riverine ecosystems.
Verticality and Horizontality Monitoring of Mahakam Bridge Piers Post-Barge Collision Using Geodetic and Structural Instrumentation Efendi, Aco Wahyudi; Safitri, Novia; Yusuf, Muh; Luzan, Irwan Faisal; Zubran, Azan
Kurva S : Jurnal Keilmuan dan Aplikasi Teknik Sipil Vol 13, No 1 (2025)
Publisher : Department of Architecture, Faculty of Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31293/teknikd.v13i1.8625

Abstract

This study evaluates the vertical and horizontal stability of Piers 2 and 3 of the Mahakam Bridge in Samarinda, East Kalimantan, a vital infrastructure subjected to heavy daily traffic loads. Monitoring was conducted using high-precision geodetic instruments, including Total Station, Geodetic GPS, Digital Level, and Tiltmeter, to accurately detect structural displacements. Data were collected over a 96-hour period and analyzed spatially using AutoCAD and ArcGIS. Results show that Pier 2 experienced lateral deflection ranging from 0.024% to 0.048%, while Pier 3 exhibited a maximum vertical deviation of 0.010% and horizontal shift up to 0.055%—within acceptable safety limits. The displacement patterns were linear and showed no abrupt angular changes. These findings confirm that the structure remains stable and safe for continued use, though periodic monitoring is recommended, especially during peak loads or after extreme weather events. This research provides a robust foundation for long-term bridge maintenance and technical decision-making.Penelitian ini mengevaluasi kestabilan vertikal dan horizontal Pilar 2 dan Pilar 3 Jembatan Mahakam di Samarinda, Kalimantan Timur, yang merupakan infrastruktur vital dengan beban lalu lintas tinggi. Pemantauan dilakukan menggunakan perangkat geodetik presisi tinggi, termasuk Total Station, GPS Geodetik, Digital Level, dan Tiltmeter, untuk mendeteksi pergeseran struktural secara akurat. Data dikumpulkan selama periode 96 jam dan dianalisis menggunakan AutoCAD dan ArcGIS untuk mendapatkan representasi spasial pergerakan. Hasil menunjukkan bahwa Pilar 2 mengalami defleksi lateral antara 0,024%–0,048%, sedangkan Pilar 3 menunjukkan deviasi maksimum sebesar 0,010% secara vertikal dan hingga 0,055% secara horizontal—masih dalam batas toleransi aman. Pola pergeseran menunjukkan kecenderungan linier dan tidak ada perubahan sudut ekstrem. Temuan ini menegaskan bahwa struktur masih stabil dan aman digunakan, namun tetap diperlukan pemantauan berkala, terutama setelah beban puncak atau kondisi cuaca ekstrem. Penelitian ini memberikan dasar kuat bagi pengambilan keputusan teknis dalam pemeliharaan jembatan jangka panjang.
FORENSIC STRUCTURAL ASSESSMENT OF MAHAKAM BRIDGE AFTER BARGE COLLISION: DAMAGE EVALUATION AND ANALYSIS Tukimun, Tukimun; Aco Wahyudi Efendi; Andi Muhammad Ade Satriya
Media Bina Ilmiah Vol. 20 No. 3: Oktober 2025
Publisher : LPSDI Bina Patria

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

In an attempt to maintain safety and functionality, bridge structures—which are essential parts of transportation infrastructure—must be resilient to unintentional events like vessel collisions. After colliding with the IS-28 ship on February 16, 2025, the Mahakam Bridge in Samarinda, Indonesia, suffered significant structural damage, especially at Pier 3. In order to evaluate the extent of the damage and the structural integrity, this study presents a forensic examination of the occurrence that combined visual inspection, dimensional measurements, and Finite Element Method (FEM) analysis. Important discoveries included spalling and exposed reinforcement bars, as well as considerable cracking in the downstream pile top with thicknesses of up to 1.3 mm and lengths of up to 4.57 meters. Furthermore, expansion joint misalignments were found, as evidenced by the left span's gradual elongation over seven years, from 4.3 cm to 5.2 cm. Critical stress concentrations were found via FEM calculations, with compressive stresses exceeding the material limit of 9,000 kN/m² and tensile stresses reaching 75 MPa. Furthermore, differences between 3D scanning and video-based evaluations brought to light the importance of precise measuring methods in structural analysis. To increase the bridge's resistance against future crashes, the study emphasizes the necessity of impact-resistant designs, targeted retrofitting techniques, and ongoing structural monitoring. This study fills a significant knowledge gap in regional forensic engineering and offers useful information for risk reduction and bridge restoration in maritime settings.
Behavior of welded joints on the roof truss of KOJK Office using LISA V.8 FEA Efendi, Aco Wahyudi
Journal of Metallurgical Engineering and Processing Technology Vol 5, No 1 (August 2024)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v5i1.12020

Abstract

Welded joints play a crucial role in the structural integrity of buildings, particularly in supporting heavy loads and resisting various forces such as wind, seismic, and gravitational loads. This research was carried out by identifying the stresses that occur in the welded joints of the truss trusses of the roof of the KOJK Central Java building, with initial analysis conditions of rigid and stiff connections, and second conditions with conditions that occur according to field findings, where the joints are non-standard and there are several holes due to welding. not perfect. Modeling analysis uses Finite Element Analisys software, namely LISA V.8 FEA (License), to obtain the stress behavior that occurs in the roof truss elements of KOJK Central Java. From the results of analysis and modeling by making two conditions, namely the condition of welding joints according to standards and welding joints under field conditions. The stress ratio at the weld joint is 1.351 and the stress ratio at the truss pull rod is 1.054.
Co-Authors Akbar Zulkarnain Amir Wardana Andi Muhammad Ade Satriya Chi Weijia Dadang Sanjaya Atmaja ESWAN, TUKIMUN, Luzan, Irwan Faisal Muh Yusuf Natriya Faisal Rachman Rizki Satria Putra Safitri, Novia Yahya Do Zubran, Azan