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All Journal Jurnal Konstruksia International Journal of Built Environment and Scientific Research Rancang Bangun BENTANG : Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil Jurnal Aplikasi Teknik Sipil JUTEKS - Jurnal Teknik Sipil Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Borneo Engineering: Jurnal Teknik Sipil Civilla : Jurnal Teknik Sipil Universitas Islam Lamongan Jurnal Sosial dan Teknologi Prosiding Seminar Nasional Teknik Sipil UMS Jurnal Indonesia Sosial Sains Journal Research of Social Science, Economics, and Management Jurnal Ekonomi, Teknologi dan Bisnis Jurnal Spesialis Teknik Sipil (JSpTS) International Journal of Health, Engineering and Technology Jurnal Konstruksi dan Infrastruktur : Teknik Sipil dan Perencanaan Jurnal Wilayah, Kota dan Lingkungan Berkelanjutan Clean Energy and Smart Technology Journal of Project Management Research
Wisnu Isvara
Department Of Civil Engineering, Universitas Indonesia
Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy 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 Dentistry Earth & Planetary Sciences Economics, Econometrics & Finance Energy Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Neuroscience Nursing Physics Public Health Social Sciences Transportation Veterinary

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Risk Analysis to Improve Procurement Time Performance of the Construction Services Project of Air Traffic Control (ATC) Tower and Supporting Facilities Prabowo, Bagus Adi; Isvara, Wisnu; Rachmawati, Titi Sari Nurul
Journal of Project Management Research Vol. 2 No. 1 (2026): Journal of Project Management Research
Publisher : Avenew Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.65303/journalpmresearch.v2i1.61

Abstract

The implementation of the procurement process for the construction services of the ATC Tower and Supporting Facilities at Perum XYZ is expected to be completed on time with the delivery of the ATC Tower infrastructure and Supporting Facilities to support optimal flight navigation services. However, in the period 2016-2023, obstacles occurred at several project locations which caused the benefits of the project development to be delayed. This study aims to analyze the dominant risk factors that affect the performance of the procurement time for the construction services of the ATC Tower and Supporting Facilities at Perum XYZ. Risk identification was carried out through literature studies and then validated by experts. Furthermore, the risks were submitted to respondents who had been involved in the procurement of construction services for the ATC Tower and Supporting Facilities at Perum XYZ and then a risk analysis was carried out by referring to the company's internal regulations related to the Company's Risk Management Policy and Guidelines. From the results of data collection and analysis, it was found that there were 5 dominant risk factors with a high risk level that affected the procurement time performance. The results of this study can be a basis for determining the development of a procurement strategy for the construction services of the ATC Tower and Supporting Facilities at Perum XYZ in improving procurement time performance
Risk Factor Assessment Causing Contract Change Orders in the Double-Double Track Project Anggi Sanjaya; Wisnu Isvara
Journal Research of Social Science, Economics, and Management Vol. 4 No. 4 (2024): Journal Research of Social Science, Economics, and Management
Publisher : Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59141/jrssem.v4i4.739

Abstract

The Indonesian government is actively pursuing infrastructure development, with railway projects being a key focus due to their high demand in Jakarta and its surrounding regions. However, the complexity of railway projects often leads to delays and numerous changes, resulting in scope modifications that necessitate change orders, which have negative consequences for the project. Managing these risks effectively is essential to mitigate their impact on project costs and performance. This study proposes a solution through the application of risk management using a qualitative method known as the Probability Impact Matrix, which helps assess the most significant risks leading to change orders. The research aims to identify and assess the risks responsible for contract change orders in the Double-Double Track Development Project. It uses a mixed-method approach, focusing on two main phases: risk identification and risk assessment. The study examines five risk factors, including project-related factors (X1), owner-related factors (X2), contractor-related factors (X3), design-related factors (X4), and external factors (X5). The results demonstrate that all five variables significantly influence changes in project scope, with risk levels ranging from moderate to high. These findings provide valuable insights for project owners, consultants, contractors, and other stakeholders involved in construction project management. The study serves as a reference for decision-making and the implementation of control measures to minimize the negative impact of change orders.
Conceptual Cost Estimation In Green Buildings By Using Regression Analysis And Artificial Neural Network Methods To Improve Accuracy Fauziyah Kamilah; Wisnu Isvara
Journal Research of Social Science, Economics, and Management Vol. 4 No. 5 (2024): Journal Research of Social Science, Economics, and Management
Publisher : Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59141/jrssem.v4i5.751

Abstract

Conceptual cost estimation is a critical task during the early stages of a construction project, especially for green buildings, which present unique sustainability challenges and design complexities. Traditional methods such as regression analysis are widely used but often rely on experienced estimators and are time-consuming, while Artificial Neural Networks (ANN) offer a modern alternative but are limited by the quality and quantity of available data. This study aims to develop a hybrid model combining regression analysis and ANN to improve the accuracy of conceptual cost estimation for green and conventional high-rise buildings in Indonesia. Using data from 22 high-rise building projects (13 conventional and 9 green buildings), the study employed regression analysis, ANN techniques, and a combination of the two, with eight key variables selected for modeling. The hybrid model demonstrated the highest accuracy, achieving a Mean Absolute Percentage Error (MAPE) of 15.09%, within the acceptable range for conceptual cost estimation (+10–30%) as per AACE standards, outperforming standalone regression and ANN models. These findings highlight that integrating regression analysis and ANN provides a robust tool for early-stage cost estimation, supporting sustainable construction practices and informed decision-making.
Development Of Alliance Strategy in The Implementation Of Risk-Based EPC Projects To Enhance Cost Performance Capacity Of PT XYZ Andri Azhari Wicaksono; Wisnu Isvara
Journal Research of Social Science, Economics, and Management Vol. 4 No. 5 (2024): Journal Research of Social Science, Economics, and Management
Publisher : Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59141/jrssem.v4i5.759

Abstract

In Indonesia's construction industry, EPC (Engineering, Procurement, Construction) contracts have become a widely recognized option, especially for projects with high levels of complexity. PT XYZ, as a state-owned construction company (BUMN), is actively involved in EPC projects in sectors such as power plants, factories, and oil processing. Given the high complexity of these projects, PT XYZ needs to form a consortium with partners to complement its limited capabilities. However, the formation of a consortium introduces risks that could potentially harm PT XYZ during project execution. This research aims to develop a risk management strategy to assist PT XYZ in making the right decisions in managing consortium risks, thereby enhancing the company's capacity to complete EPC projects. The research findings reveal that the highest risks occur during the construction phase, categorized as “Medium to High” level. These risks include "The Vendor Chosen by the Partner Lacks Competence", "Redesign Work, Design Errors or Defects, and Poor Design Variation Process Management", and "Poor Coordination Process Between Design, Procurement, and Construction"
Development of Strategies to Improve the Accuracy of Cost Estimates in Risk-Based Building Construction Projects Agnes Sari Diah Astuti; Wisnu Isvara
Journal Research of Social Science, Economics, and Management Vol. 4 No. 12 (2025): Journal Research of Social Science, Economics, and Management
Publisher : Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59141/jrssem.v4i12.939

Abstract

The cost planning process is the initial stage of a construction project to plan for implementation costs that allow the project owner to determine economic feasibility and evaluate alternatives to achieve the desired feasibility. Poor planning can result in cost overruns, delays and even project cancellations. The cost planning process must be carried out accurately by considering many risk factors so that it can reduce the occurrence of cost overruns at the end of the project. Systemic risk is one of the factors that is often the main driver of the accuracy of cost estimates, especially during the early stages of project determination (AACE, 2020). The purpose of the study was to determine the most dominant systemic risk factors for the accuracy of cost estimates based on the owner's point of view. The methods used are qualitative and quantitative approaches or combined data from both (Ahnyar, Andriani, & Sukmana, 2020), surveys, expert validation, Risk Analysis using the Probability Impact Matrix and Forum Group Discussion (FGD). Questionnaire surveys were conducted on 34 respondents and processed with SPSS software to analyze the data. 13 systemic risk factors that affect the accuracy of the estimate were identified. The control strategy for the 13 recommended systemic risk factors is to develop operational standards for risk-based estimation, create a unit price database based on the realization price of previous projects, conduct training by involving competent senior estimates, add reserve or contingency factors, and look for alternative materials without reducing benefits and usefulness.
Mitigasi Getaran Enclosed High Temperature Flaring System (EHTFS) Berbasis Operational Modal Analysis dan Interaksi Tanah–Struktur Heri Khoeri; Wisnu Isvara
Jurnal Konstruksi dan Infrastruktur : Teknik Sipil dan Perencanaan Vol 14 No 1 (2026): Jurnal Konstruksi dan Infrastruktur Vol 14 No.1 : April 2026
Publisher : Civil Engineering Department, Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jki.v14i1.11711

Abstract

Enclosed High Temperature Flaring Systems (EHTFS) are employed to control gas emissions through high-temperature enclosed combustion; however, structural modifications such as flare stack heightening may alter dynamic characteristics and induce environmental vibration problems. This study evaluates vibration responses induced by EHTFS operation and investigates the mechanisms of vibration amplification and resonance affecting surrounding structures. Field measurements were carried out using three-axis accelerometers installed on the flare stack, supporting structures, soil, and nearby residential buildings during flaring events. Structural dynamic properties were identified using Operational Modal Analysis (OMA) based on the Stochastic Subspace Identification (SSI) method, combined with an assessment of soil–structure interaction. The results show dominant vibration frequencies of 6.1–6.2 Hz, where the natural frequencies of the flare stack and nearby houses are closely spaced. Peak acceleration at residential buildings reached 0.149 m/s², approximately twice that at the source (0.074–0.077 m/s²), indicating significant amplification. Soil investigation revealed shear-wave velocities of 168–257 m/s with relative dynamic amplification factors up to 1.0. Although soil–structure interaction influences wave propagation, the observed amplification is primarily attributed to low-frequency resonance between operational excitation and structural natural frequencies. Increasing flare stack stiffness effectively shifts the natural frequency and reduces resonance potential. The proposed integrated OMA–SSI framework provides a reliable basis for vibration mitigation in industrial flaring facilities.
Static Load Testing Of PCI-Bridges for Assessing Functional Suitability and Its Comparison with Dynamic Testing Heri Khoeri; Wisnu Isvara; Jack Widjajakusuma; Fani Natasa; Dini Sofiana
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol. 9 No. 1 (2024): EDISI MARET 2024
Publisher : UNITRI PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v9i1.5655

Abstract

 To accommodate the rapid development of residential and commercial areas in the Bumi Serpong Damai (BSD) Region, Banten, the construction of the Kadisurung bridge is necessary to integrate road networks. Before being operational to ensure the safety of bridge users, load testing is conducted. Parameters that must be met in the testing include not exceeding the strain and deflection limits during operational conditions, including when maximum loading occurs. To assess the bridge's performance during operation, research was conducted on both sides of the central span (western side bridge, JSB, and eastern side bridge, JST) with static load testing carried out with gradually increasing loads up to 50% UDL (136 tons), followed by gradual load removal. At JSB, the maximum deflection at 100% UDL, estimated from the deflection at 50% UDL, was 39.92 mm, and at JST, it was 31.67 mm, while the allowable deflection was 43.3 mm. Based on the deflection parameters, the relative capacities of JST and JSB are expressed as 108.5% and 136.7% respectively, relative to their allowable capacities. This indicates that the estimated bridge capacity using static load testing parameters is 6%-10% greater than when using parameters from dynamic load testing. Thus, the bridge is deemed suitable for operation.
Determining Procurement Strategy Alternatives Through The Identification And Assessment Of Delay Risks In Procurement Activities For Public School Construction Projects In DKI Jakarta Province Boris Sembiring Kembaren Boris; Ayomi Dita Rarasati; Wisnu Isvara
International Journal of Health Engineering and Technology Vol. 5 No. 2 (2026): JULY 2026
Publisher : CV. AFDIFAL MAJU BERKAH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55227/ijhet.v5i2.967

Abstract

Public school building construction projects in DKI Jakarta Province are one of the government’s strategic programs to improve the quality of educational facilities. In their implementation, the construction procurement process plays an important role in determining project success, particularly in terms of timely completion. However, various activities within the procurement process have the potential to create delay risks that may affect overall project performance. This study aims to identify activities in the construction procurement process that have the potential to cause delays and to assess delay risks based on two main dimensions, namely risk impact and likelihood of occurrence. The research method used is descriptive qualitative with a case study approach. Data collection techniques include observation, survey (Likert-scale questionnaire), document study, and archive analysis. The research respondents consist of parties directly involved in the construction procurement process. Data analysis is conducted using descriptive qualitative analysis and risk analysis to determine the level of risk for each procurement activity. The results of this study are expected to provide an overview of critical activities in the procurement process that have the potential to cause delays and serve as a basis for improving construction procurement management in public school building projects in DKI Jakarta Province. Based on the results of the risk analysis, the highest-risk factors are identified and selected, and procurement strategies are then formulated to minimize the risk of delays in public school building construction projects in DKI Jakarta Province.
Developing a CMBOK 7th Based Contract Management Framework for Claim Prevention in Apartment Construction Projects: English Ivan Sulistio Prabowo; Mustika Sari; Wisnu Isvara
International Journal of Built Environment and Scientific Research Vol. 10 No. 1 (2026): International Journal of Built Environment and Scientific Research
Publisher : Department of Architecture Universitas Muhammadiyah Jakarta

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

Abstract

Contract management plays an important role in preventing claims in apartment construction projects characterized by design changes, multiple stakeholders, and inconsistencies between contract documents and actual site conditions. This study aims to evaluate existing apartment project contract management practices against CMBOK 7th edition principles, identify claim-causing factors, and develop a contract management framework for claim prevention. The study employed a mixed method sequential exploration approach through document review, literature synthesis, semi-structured interviews, and CMBOK 7th based conceptual analysis. The synthesis shows that the main causes of the claim include unclear scope of work, design changes, bill of quantities ambiguity, weak contract administration, and unsystematic change control. This study proposes a CMBOK 7th based framework consisting of contract planning control, contract formation control, contract execution control, and contract learning control to strengthen claim prevention in apartment construction projects.
Co-Authors Agnes Sari Diah Astuti Andreas Wibowo Andri Azhari Wicaksono Anggi Sanjaya Asep Handaya Saputra Astuti Fahmilia Astuti, Agnes Sari Diah Badaruddin, B Boris Sembiring Kembaren Boris Brama Halilintar Dini Sofiana Dini Sofiana Fahmilia, Astuti Fani Natasa Fauziyah Kamilah Heri Khoeri Heri Khoeri Heri Khoeri Heri Khoeri Ivan Sulistio Prabowo Jack Widjajakusuma Jariski, Muzamil Kerri Dwiky Iswara Khoeri, Heri Leni Sagita Riantini Mustika Sari Muzamil Jariski Natasa, Fani Nugroho, Panji Panji Nugroho Prabowo, Bagus Adi Pradana, Roberto Rachmad Irwanto Rachmawati, Titi Sari Nurul Rarasati, Ayomi Dita Roberto Pradana Roberto Pradana Sofiana, Dini Yusuf Latief