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Widowati, Elok Dewi
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Analysis of Potential Work Hazard Risk in the Development of the Road Project Using the HIRARC and FTA Methods Manurung, Liza Olivia; Putra, I Nyoman Dita Pahang; Widowati, Elok Dewi
Physical Sciences, Life Science and Engineering Vol. 2 No. 3 (2025): June
Publisher : Indonesian Journal Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47134/pslse.v2i3.417

Abstract

Risk refers to a situation with potential loss or the chance of a loss. Every stage in the construction process inevitably carries potential risk hazards that can threaten the safety of workers, the environment, and the surrounding community. Therefore, a study was conducted to analyse possible risks during mobilising heavy equipment and material vehicles, excavation and embankment work, and blasting work in the X Road construction project.  This study employed two methods for risk analysis. The first method involved identifying types of work-related accidents using the HIRARC approach, which included distributing questionnaires to assess each variable's likelihood and severity levels to determine the most significant risk. Then, control measures were applied to the identified risks. After implementing the control measures, a risk reassessment was conducted to assess the level of risk post-control. The identification revealed one dominant variable: heavy equipment overturning from a height. Thus, the analysis continued using the second FTA method to determine the causal factors influencing the risk. The risk was caused by three main factors: human, environmental, and managerial factors, and ten basic events leading to the risk were identified.
Financial Performance Assessment of Flat Buildings Using Life Cycle Cost and Cost–Benefit Analysis Velantika, Griselda Junianda; Mikhail, Reguel; Putri, Karina Meilawati Eka; Widowati, Elok Dewi; Alghiffary, Rizqi; Akbari, Muhamad Fauzan
Advance Sustainable Science Engineering and Technology Vol. 7 No. 1 (2025): November-January
Publisher : Science and Technology Research Centre Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/asset.v7i1.1005

Abstract

Buildings resulting from construction projects are durable assets and decisions related to construction projects have enduring impacts. In many cases, building owners prioritize only the initial costs, such as building design, construction, and equipment costs, while neglecting the future operation and maintenance costs. This research studies life cycle costing (LCC) analysis to evaluate the financial feasibility of urban housing. The LCC calculates all the costs incurred and benefits during the building's operation. The cost is generated from construction, operational, and maintenance costs. At the same time, the benefit breaks down into flat rental costs, retail rental costs, and parking costs. The costs incurred are estimated over 25 years, and the parameters of feasibility are net Present Value (NPV), Benefit-Cost Ratio (BCR), and Internal Rate of Return (IRR). The study generates negative NPV, BCR < 1, and 0.61% of IRR. It indicates that the project is not feasible. This research gives alternatives to make the project feasible. This study employed a trial-and-error approach to ascertain the viability of investing in flat rentals by systematically adjusting rental rates. Incremental adjustments to rental rates are tested by a series of rate hikes of 50%, 100%, 150%, and 200% using a trial-and-error approach. The project will become feasible if the flat rate increases to 150-200% of the initial rental rate.
FEASIBILITY EVALUATION OF THE RELATIONSHIP BETWEEN BCWS, BCWP AND ACWP IN ROAD CONSTRUCTION PROJECT Bawana, Massayu Sekar; Putra, I Nyoman Dita Pahang; Widowati, Elok Dewi
Multidiciplinary Output Research For Actual and International Issue (MORFAI) Vol. 5 No. 3 (2025): Multidiciplinary Output Research For Actual and International Issue
Publisher : RADJA PUBLIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54443/morfai.v5i3.2991

Abstract

The development of adequate infrastructure, such as roads, bridges, and other public facilities, play a vital role in driving national economic growth. Infrastructure projects require careful planning and controlled execution to ensure effective and efficient outcomes. This study focus on addressing the common issues of delays and cost overruns that frequently occur during project implementation. The objective is to analyze the alignment between planned and actual project performance. Using a quantitative methods, this research integrated the Earned Value Method (EVM) to assess project performance. The results indicate that, between weeks 26 and 39, the project generated performance that was both ahead of schedule and below budget. This is evidenced by positive values in both schedule and cost variance (SV and CV), along with the Schedule and Cost Performance Index (SPI and CPI) values exceeding 1. However in week 40, a decrease in schedule performance was observed, leading to a slight project delay. The project’s estimated overall cost is IDR 116.8 billion, representing a decrease from the initial budget allocation, with an estimated delay is only around 18 days.
IMPLEMENTASI BIM (BUILDING INFORMATION MODELING) TERHADAP PENINGKATAN EFISIENSI DAN AKURASI PADA PERHITUNGAN ESTIMASI BIAYA PROYEK PEMBANGUNAN JALAN JALUR LINTAS SELATAN (JLS) LOT 3 PANTAI SERANG – SUMBERSIH Maura Muzdhalifa, Rencany; Pahang Putra, I Nyoman Dita; Widowati, Elok Dewi
JURNAL TEKNIK SIPIL CENDEKIA (JTSC) Vol 6 No 2 (2025): July
Publisher : Departement of Civil Engineering, Universitas Winaya Mukti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51988/jtsc.v6i2.323

Abstract

The development of technology has significantly influenced the construction industry, introducing innovations that enhance project execution efficiency and accuracy. One of the notable advancements is Building Information Modeling (BIM) is a digital representation of a building that fully illustrates its form, size, and functional aspectsThis study aims to implement Building Information Modeling (BIM) for Quantity Take Off (QTO) using Autodesk Revit 2025 and compare its results with conventional methods in terms of volume and cost estimation accuracy. The research object is the South Cross Road Construction Project (JLS) Lot 3 from Pantai Serang to Sumbersih. This comparative quantitative study utilizes Detail Engineering Design (DED) documents and 3D modeling with Autodesk Revit 2025. The findings show that BIM-based QTO produces more accurate and efficient cost estimations, especially in complex calculations such as cut and fill operations. The BIM method resulted in a total project cost that was 13.73% higher than the conventional method, primarily due to more precise terrain modeling. This research is expected to be a reference for improving the accuracy of infrastructure project cost estimation.
Analisis Mutu dan Faktor-faktor yang Mempengaruhi Mutu Beton Kolom Menggunakan Metode SPC dan RII Siska Ayu Aprilia Yusuf; Putra, I Nyoman Dita Pahang; Widowati, Elok Dewi
Jurnal Civil Engineering Study Vol. 5 No. 02 (2025): Jurnal Civil Engineering Study
Publisher : Civil Engineering of Universitas Islam Nahdlatul Ulama Jepara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34001/ces.v5i02.1337

Abstract

Beton merupakan material yang umum digunakan dalam pelaksanaan konstruksi karena mempunyai kekuatan tekan yang tinggi dengan biaya yang terjangkau. Namun, dalam pelaksanaannya sering dijumpai hasil akhir beton atau mutu beton aktual yang tidak sesuai dengan mutu beton rencana. Oleh karena itu, untuk meminimalisir terjadinya penyimpangan mutu dilakukan pengendalian mutu terhadap beton. Tujuan penelitian ini adalah untuk mengetahui ketepatan mutu beton kolom pada Proyek Pembangunan Hotel X berdasarkan SNI 2847:2019 dan untuk mengetahui faktor-faktor yang mempengaruhi ketepatan mutu beton kolom pada Proyek Pembangunan Hotel X. Penelitian ini menggunakan dua jenis data yaitu sekunder dan data primer. Data sekunder berupa hasil uji kuat tekan beton pada kolom, sedangkan data primer didapatkan dari kuesioner. Penelitian ini menggunakan metode Relative Importance Index (RII) dan metode Statistical Process Control (SPC). Hasil penelitian ini menyimpulkan bahwa mutu beton aktual lebih tinggi dari mutu beton rencana serta indikator yang sangat mempengaruhi ketepatan mutu beton berdasarkan nilai RII adalah rasio berat air dan semen.
Analisis dan Desain Modifikasi Jembatan Rangka Busur Baja dengan Fluid Viscous Damper Menggunakan SAP2000 Akbari, Muhamad Fauzan; Saputra, Yohanes Hadi; Alghiffary, Rizqi; Velantika, Griselda Junianda; Eka Putri, Karina Melawati; Widowati, Elok Dewi
Jurnal Proyek Teknik Sipil Vol 8, No 2 (2025): September
Publisher : Civil Infrastructure Engineering and Architectural Design

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/potensi.2025.29068

Abstract

ABSTRACT The bridge design modification presented in this study focuses on implementing a steel arch truss system combined with Fluid Viscous Dampers (FVDs) to improve structural efficiency and seismic resilience. The steel arch truss enables a longer main span with fewer intermediate supports, offering construction advantages, enhanced stability, and improved aesthetics. Additionally, the integration of FVDs aims to reduce structural displacements during seismic events, thereby minimizing potential post-earthquake damage.The object of this study is referred to as Bridge XYZ, assumed to be one of the key bridges in Gresik Regency, serving as a vital connection between Gresik and Lamongan. This bridge plays a strategic role in supporting mobility and logistics distribution in the region, making structural optimization and seismic mitigation essential. The research methodology includes data collection and literature review, followed by the structural redesign process. Structural modeling and analysis were conducted using SAP2000 software, adhering to Indonesian bridge and seismic design standards. The primary objective is to develop a single-span bridge configuration using steel orthotropic decks for a lighter superstructure and to evaluate the effectiveness of FVDs in reducing seismic-induced displacements. The analysis results show that the redesigned bridge utilizes BJ55 steel orthotropic deck plates with T-profile ribs, cross girders with WF profiles, tie beams with box girders, and Macalloy suspension cables. The application of FVDs successfully reduced seismic displacement by 3% to 45%, demonstrating their effectiveness in enhancing the bridge’s structural resilience.KEYWORDS Fluid Viscous Damper; SAP2000; Steel Arch Truss.
PROJECT DURATION FORECASTING METHODS USING EVM AND ESM FOR A DOUBLE-TRACK RAILWAY PROJECT IN COMPARISON Widowati, Elok Dewi; Resita, Andyska Maya
Jurnal Pensil : Pendidikan Teknik Sipil Vol. 14 No. 3 (2025): Jurnal Pensil : Pendidikan Teknik Sipil
Publisher : LPPM Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/jpensil.v14i3.59154

Abstract

The growing complexity of infrastructure projects, such as railway construction, necessitates precise tools to monitor progress and accurately predict completion times. Traditional methods often fail to capture real-time schedule dynamics, resulting in ineffective project management. This study employs earned value management (EVM) and earned schedule (ES) to predict the project duration for a double-track railway initiative. Performance metrics for scheduling, such as SPI and SPI(t), as well as forecasting tools, including EAC(t), IEAC, and IEAC(t), were analyzed over 28 weeks. The results demonstrate that SPI(t)-based methods offer more stable and realistic duration forecasts than conventional SPI-based approaches, particularly during periods of poor performance. IEAC values fluctuated sharply during the project's early and middle stages, exceeding 800 days, while IEAC(t) remained consistent, aligning closely with actual progress. After the implementation of contract addenda in Weeks 21 and 27, both indicators improved significantly. SPI and SPI(t) exceeded 1.0, and the forecasted completion date aligned closely with the original plan. The study concludes that the ES method improves schedule forecasting accuracy and provides better insight into project performance trends.
Co-Authors Akbari, Muhamad Fauzan Alghiffary, Rizqi Bawana, Massayu Sekar Eka Putri, Karina Melawati Manurung, Liza Olivia Maura Muzdhalifa, Rencany Mikhail, Reguel NYOMAN DITA PAHANG PUTRA, NYOMAN Putri, Karina Meilawati Eka Resita, Andyska Maya Saputra, Yohanes Hadi Siska Ayu Aprilia Yusuf Velantika, Griselda Junianda