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All Journal Journal of Engineering and Technological Sciences Advance Sustainable Science, Engineering and Technology (ASSET)
Mikhail, Reguel
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Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Industrial & Manufacturing Engineering

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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.
Advanced Geotechnical Solutions for Soft Soils: FEM Analysis and Hybrid Reinforcement in the Semarang-Demak Toll Road Project Kartawiria, Andi Kurnia Setiadi; Kamaruddin, Samira Albati Binti; Nazir, Ramli Bin; Alatas, Idrus Muhamad; Himawan, Agus; Hartasurya, Pasca; Imran, Iswandi; Mikhail, Reguel; Kurniawan, Yusrizal; Wibowo, Prasetyo Arief; Manurung, Ardita Elias; Maharani, Yusuf; Anggadinata, Yusmar; Setiawan, Muhammad Hariyadi; Siswantono, Siswantono; Wibawa, Sholeh Hendra; Editia, Rakhma Nur
Journal of Engineering and Technological Sciences Vol. 57 No. 5 (2025): Vol. 57 No. 5 (2025): October
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2025.57.5.7

Abstract

This paper presents an analysis of the data collected from the full-scale trial embankment implemented in the Semarang-Demak Toll Road project, part of a national strategic project in Central Java, Indonesia. The project integrates a sea dike with a road embankment. The main challenge of the project lies in constructing the embankment on soft soil layers up to 40 meters thick. The road embankment is designed to reach a height of 6 meters above Mean Sea Level (MSL) or 8 meters above the average seabed level. In the absence of ground improvement techniques—such as bamboo mattress, prefabricated vertical drains (PVD), or high-strength geotextiles—very soft soil with an undrained shear strength of approximately 6.5 kPa can support only a critical embankment height of about 3 meters. A hybrid reinforcement that combines bamboo mattresses, high-strength woven geotextile, PVD and staged embankment construction is selected to solve the shear strength and settlement problem. Mattress acts as platform and designed to deform as much as the soft-soil to spread initial embankment load uniformly and increase bearing capacity, PVD accelerates consolidation, and high-strength woven geotextile provides tension capacity. To achieve a load ratio of 1.3 in accordance with SNI 8460-2017, a 13.5-meter soil preloading needs to be constructed. Several monitoring systems were installed to monitor the behavior of the entire embankment system. Complementary investigations, including CPT, CPTu, and Deep Boring, were conducted. Finite element analysis (FEA) was then performed, revealing improved performance, achieving safety factors of 1.25 during construction and 1.55 long-term.
Co-Authors Agus Himawan Akbari, Muhamad Fauzan Alatas, Idrus Muhamad Alghiffary, Rizqi Anggadinata, Yusmar Editia, Rakhma Nur Hartasurya, Pasca Iswandi Imran Kamaruddin, Samira Albati Binti Kartawiria, Andi Kurnia Setiadi Kurniawan, Yusrizal Maharani, Yusuf Manurung, Ardita Elias Nazir, Ramli Bin Putri, Karina Meilawati Eka Setiawan, Muhammad Hariyadi Siswantono, Siswantono Velantika, Griselda Junianda Wibawa, Sholeh Hendra Wibowo, Prasetyo Arief Widowati, Elok Dewi