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All Journal Jurnal Konstruksia 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 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)
Wisnu Isvara, Wisnu
Department of Civil Engineering, Universitas Indonesia
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 Earth & Planetary Sciences Economics, Econometrics & Finance Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Neuroscience Physics Social Sciences Transportation

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Penilaian Kelaikan Jembatan Berdasarkan Parameter Dinamis Experimental pada Jembatan PC-I Girder 40 m Khoeri, Heri; Isvara, Wisnu; Natasa, Fani; Sofiana, Dini
Jurnal Aplikasi Teknik Sipil Vol 22, No 1 (2024)
Publisher : Departemen Teknik Infrastruktur Sipil Institut Teknologi Sepuluh Nopember Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2579-891X.v22i1.19341

Abstract

Jembatan dan terowongan jalan merupakan salah satu prasarana transportasi yang menyangkut hajat hidup orang banyak dan mempunyai fungsi sosial yang sangat penting sehingga harus dilakukan penyelenggaraan keamanan bagi pengguna jalan. Sebelum sebuah jembatan difungsikan harus dilakukan pengujian, untuk memastikan tingkat keselamatan dan keamanan jembatan. Pengujian pembebanan dinamik (uji getar) bertujuan untuk mendapatkan parameter dinamik seperti frekuensi alami, rasio redaman, kekakuan dan pola getar, sebagai salah satu indikator untuk menilai kelaikan fungsi jembatan. Hasil uji getar, baik sisi barat (JSB) maupun sisi timur (JST) menunjukkan performa yang baik dengan frekuensi alami JSB 4.093 Hz dan JST 4.956Hz lebih tinggi dari pendekatan teoritik yaitu 4.002 Hz. Hal ini menunjukkan bahwa kekakuan aktual lebih tinggi dibandingkan teoritisnya. Rasio redaman aktual JSB 2.138% dan JST 2.883%, nilai tersebut masuk katagori beton utuh. Berdasarkan penilaian parameter dinamik, jembatan dinyatakan laik fungsi
Asesmen Geoteknik Keretakan Cold Water Pipe (CWP) pada Pembangkit Listrik Tenaga Uap dan Rekomendasi Perbaikan Khoeri, Heri; Badaruddin, B; Isvara, Wisnu
Prosiding Seminar Nasional Teknik Sipil UMS 2024: Prosiding Seminar Nasional Teknik Sipil UMS
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

Pipa air dingin (Cold Water Pipe, CWP) sebuah PLTU mengalami kebocoran setelah 7 tahun beroperasi karena retaknya CWP yang mengakibatkan PLTU shutdown. Perbaikan sudah dilakukan termasuk dengan aplikasi pile jet grouting tepat di bawah CWP namun kebocoran masih terjadi. CWP tersebut diletakkan di atas tanah lunak setebal 35m (Nspt 2 s/d 4) dengan tambahan timbunan 3m sebelum pemasangan CWP tanpa soil improvement. Asesmen dilakukan untuk mengevaluasi penyebab terjadinya kebocoran pipa, mengevaluasi efektivitas pile jet grouting, dan memberikan rekomendasi perbaikan yang tidak menimbulkan masalah baru di kemudian hari. Hasil analisis menunjukkan penurunan tanah akibat konsolidasi setelah 7 tahun beroperasi telah mencapai 60% yaitu 46cm. Nilai ini mendekati hasil pengukuran lapangan yang nilainya antara 30 cm s/d 50 cm. Masih ada potensi penurunan hingga derajat konsolidasi 90%, yang diestimasi 60cm di tahun ke-15 setelah operasi, artinya dalam 8 tahun berikutnya potensi penurunan masih 20cm. Kebocoran teridentifikasi akibat perbedaan penurunan antara CWP yang menumpu pada pile cap dengan yang langsung di tanah, mencapai 4 cm sesaat setelah pipa ditanam, meningkat menjadi 5.5cm pada tahun ke-7, dan 5,7cm pada tahun ke-15. Pipa sepanjang 12m dengan penurunan 5.5cm akan berotasi 0.53o pada tumpuannya, nilai ini melebihi batas ijinnya yang dibatasi 0.5o. Aplikasi jet grouting setempat justru berpotensi menambah penurunan. Mengingat masih ada potensi penurunan namun tidak sebesar di 7 tahun pertama, maka merekomendasikan pemasangan camp plate sebagai alat monitoring dan adjustable support untuk menaikkan pipa jika camp plate mengindikasikan penurunan mendekati batas ijinnya.
Risk Factor Assessment Causing Contract Change Orders in the Double-Double Track Project Sanjaya, Anggi; Isvara, Wisnu
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 Kamilah, Fauziyah; Isvara, Wisnu
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 Azhari Wicaksono, Andri; Isvara, Wisnu
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 Astuti, Agnes Sari Diah; Isvara, Wisnu
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.
The Implementation of Building Information Modelling for Cut and Fill Quantity Takeoff in Toll Road Project Fahmilia, Astuti; Isvara, Wisnu
Jurnal Indonesia Sosial Sains Vol. 4 No. 08 (2023): Jurnal Indonesia Sosial Sains
Publisher : CV. Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59141/jiss.v4i08.856

Abstract

Technology has been going rapidly through the years, and BIM is one of the massive developments that offer some benefits for the construction industry. BIM is widely used in building project and has started to be used in infrastructure projects such as toll roads. In a toll road project, cut and fill is one of the massive volumes, which consume a lot of time to calculate the quantity and has a high chance to human error. This research aims to determine the implementation of BIM in cut and fill quantity take-off in Toll Road Project. The methodology for this research is qualitative descriptive with in-depth interviews with the expert. The study shows that implementing quantity take-off with BIM increases accuracy, reduces time, minimizes human error and efficiency. Nevertheless, still have some lacks, such as expensive cost for siftware, hardware and training, needs a long time adaptation to the organization, and also need collaboration all of the stakeholder to succesfuly implement BIM
Co-Authors Andreas Wibowo Astuti, Agnes Sari Diah Azhari Wicaksono, Andri Badaruddin, B Fahmilia, Astuti Heri Khoeri Irwanto, Rachmad Jack Widjajakusuma Jariski, Muzamil Kamilah, Fauziyah Khoeri, Heri Leni Sagita Riantini, Leni Sagita Natasa, Fani Nugroho, Panji Pradana, Roberto Sanjaya, Anggi Sofiana, Dini Yusuf Latief