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Tulus Widiarso
Universitas Trisakti
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Pengolahan Sampah Terpadu Dengan Konsep Waste To Energy Di Smart City IKN Rose, Ugahari; Kusumawati, Lili; Kurniyaningrum, Endah; Pontan, Darmawan; Widiarso, Tulus
Jurnal Locus Penelitian dan Pengabdian Vol. 4 No. 6 (2025): JURNAL LOCUS: Penelitian & Pengabdian
Publisher : Riviera Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58344/locus.v4i6.4269

Abstract

In the context of the development of Indonesia’s new capital city in East Kalimantan, waste management presents increasingly complex challenges. Due to limited existing infrastructure, unintegrated waste management can lead to groundwater contamination, vegetation cover degradation, and threats to local biodiversity. This study aims to evaluate the implementation of an integrated waste treatment system combined with Waste to Energy (WtE) technology in the Capital City Area. Data were collected through direct observation and interviews with relevant stakeholders to measure the operational performance of the system. Field measurements included emissions analysis, energy production, and waste volume reduction. Based on a 15-day observation period in December 2024, thermal treatment produced only 2.97% residue. Assuming the operation of a single incinerator unit and limited waste supply, waste can be converted into electrical energy (Waste to Energy) with a power output of 195.169 watts. It can be concluded that by operating two incinerator units under the current conditions, the energy output could be doubled to 390.338 watts.
House of Risk Approach in Determining Delay Risk Factors Kardiani, Rani; Kurniyaningrum, Endah; Yuwono, Bambang Endro; Widiarso, Tulus
IAIC Transactions on Sustainable Digital Innovation (ITSDI) Vol 6 No 2 (2025): April
Publisher : Pandawan Sejahtera Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34306/itsdi.v6i2.690

Abstract

Delays in project completion can lead to significant financial losses, reduced contractor performance, and decreased operational efficiency. This study analyzes the delay factors in the Proton Beam Building construction project at RSPAD Gatot Soebroto, identifying the primary causes and proposing targeted mitigation strategies. A mixed-method approach, combining qualitative interviews and quantitative surveys with key project stakeholders including planning consultants, construction management teams, contractors, and other involved parties is employed. The analysis utilizes the House of Risk (HOR) method to identify and prioritize delay agents and the House of Delay (HOD) method, supplemented by Forum Group Discussions for comprehensive insights. Keyresearch variables encompass human resources, materials, equipment, contract administration, project planning, field conditions, and stakeholder involvement. The study reveals that the primary causes of delays are inadequate planning, design changes, and a shortage of qualified human resources in construction management and planning consulting. The HOR methodology identifies the top three delay agents: Planning not in accordance with regulations (A8), Design changes (A6), and Lack of human resources (A4). To address these issues, the study proposes mitigation strategies, including the creation of a comprehensive checklist for regulatory compliance during planning, ensuring design alignment with applicable regulations, and developing contingency plans to addresspotential human resource shortages. These strategies aim to reduce the most significant delay risks, improve project efficiency, and enhance overall project compliance.
ANALISIS KONSEP KEBERLANJUTAN PADA BANGUNAN CAGAR BUDAYA ANALYSIS OF SUSTAINABILITY CONCEPTS IN HERITAGE BUILDINGS Khansseler, Gery; Widiarso, Tulus; Wijayanto , Punto
Metrik Serial Teknologi dan Sains Vol. 6 No. 2 (2025): agustus
Publisher : Konsorsium Cendekiawan Indonesia

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Abstract

Keberlanjutan merupakan aspek penting dalam pembangunan, termasuk dalam pelestarian bangunan cagar budaya. Sebagai konsep jangka panjang, keberlanjutan tidak hanya berfokus pada efisiensi energi dan adaptasi terhadap perubahan iklim, tetapi juga pada pelestarian nilai historis dan estetika bangunan. Dalam konteks urbanisasi dan perubahan iklim yang semakin pesat, konservasi bangunan bersejarah menjadi tantangan kompleks yang memerlukan pendekatan holistik. Konsep keberlanjutan diterapkan untuk memperpanjang umur bangunan melalui pengelolaan sumber daya yang ramah lingkungan serta adaptasi struktural terhadap kebutuhan masa kini tanpa menghilangkan nilai budaya yang terkandung. Penelitian ini menggunakan metode kualitatif dengan studi kasus pada beberapa bangunan cagar budaya di Indonesia yang telah menerapkan prinsip keberlanjutan. Data diperoleh melalui observasi lapangan, wawancara dengan ahli konservasi, dan studi literatur. Analisis difokuskan pada identifikasi elemen keberlanjutan yang dapat diintegrasikan dalam struktur dan material bangunan lama. Hasil studi menunjukkan bahwa penerapan prinsip keberlanjutan dapat meningkatkan efisiensi konservasi, memperpanjang usia bangunan, serta memperbaiki kualitas lingkungan sekitar. Studi ini memberikan kontribusi terhadap pengembangan kebijakan dan praktik konservasi bangunan bersejarah yang berkelanjutan, serta menjadi panduan bagi arsitek dan pengambil keputusan di Indonesia.
Software Based Geotechnical Analysis of Spillway Slope Reinforcement Fabyanto, Ikhsan; Zaki, Muhammad; Pontan, Darmawan; Widiarso, Tulus
Technomedia Journal Vol 10 No 2 (2025): October
Publisher : Pandawan Incorporation, Alphabet Incubator Universitas Raharja

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33050/zzgyr313

Abstract

The construction of large-scale infrastructure such as dams requires precise planning and implementation to ensure structural stability and long-term operational safety. This study aims to analyze slope protection and embankment reinforcement at the spillway excavation area of the Dam Project in Surian District, located in the 137 km-long Cipunagara River Basin. A quantitative approach was applied, using geotechnical modeling software Plaxis 8.6 and Microsoft Excel for data processing. Three slope reinforcement methods were compared: geomat, shotcrete, and cocomesh. Based on the analysis, slope reinforcement using shotcrete achieved the highest safety factor, with short-term SF = 1.649 (34.50% increase) and long-term SF = 1.514 (23.49% increase). Geomat ranked second with SF = 1.544 (25.94%) and 1.418 (15.66%), while cocomesh obtained SF = 1.540 (25.61%) and 1.355 (10.52%). The unreinforced slope had an SF of 1.226. In terms of cost, shotcrete was the most expensive at IDR 4,331,068,967.23, followed by geomat (IDR 2,734,025,024.50) and cocomesh (IDR 906,745,000.00). However, shotcrete also required the longest construction time (30 days) compared to geomat (20 days) and cocomesh (16 days). Shotcrete provides the best technical performance for slope stability, but geomat and cocomesh are more efficient alternatives in terms of cost and time, offering a balanced solution for slope reinforcement projects.
Analisis Perbandingan Risiko Pelaksanaan Konstruksi Kontrak Pekerjaan Lumsum dan Harga Satuan Riyanto, Sugeng; Anwar, Saihul; Pontan, Darmawan; Widiarso, Tulus
Jurnal sosial dan sains Vol. 4 No. 7 (2024): Jurnal Sosial dan Sains
Publisher : Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59188/jurnalsosains.v4i7.1478

Abstract

Latar Belakang: Dalam pelaksanaan konstruksi di Indonesia, kontrak antara pemilik proyek dan kontraktor sering menggunakan kontrak lumsum dan kontrak harga satuan. Kontraktor harus menjaga peluang keuntungan sambil mengelola risiko biaya, waktu, dan mutu. Untuk mencapai konstruksi yang efektif, penting untuk menganalisis risiko pada kedua jenis kontrak ini dengan mempertimbangkan persepsi, preferensi, pengalaman, dan intuisi kontraktor. Tujuan: Menganalisis risiko-risiko menggunakan Metode Analytic Hierarchy Process (AHP) dengan Microsoft Excel, yang memberikan hasil penilaian subjektif dan objektif. Metode: Analisis dilakukan dengan menentukan variabel/kriteria risiko, mengembangkan struktur hierarki yang terdiri dari tiga level (kriteria, sub-kriteria, dan alternatif), dan menyusun kuesioner. Kuesioner disebarkan kepada 12 responden dari PT. Nindya Karya - Divisi EPC. Data kemudian ditabulasikan, dibuat matriks berpasangan, dilakukan perbandingan berpasangan, dihitung nilai rata-rata, diukur bobot prioritas, dan diperiksa Consistency Ratio (CR). Hasil: Pada kriteria level 1, aspek biaya memiliki risiko tertinggi (39,68%), diikuti mutu (38,96%) dan waktu (21,35%). Pada sub kriteria level 2, risiko tertinggi pada aspek biaya adalah pekerjaan tambah kurang akibat perubahan desain (13,33%), pada aspek waktu adalah penerapan metode pelaksanaan yang tidak tepat (29,96%), dan pada aspek mutu adalah ketidaksesuaian desain (23,60%). Pada alternatif level 3, risiko tertinggi adalah tenaga kerja yang kurang profesional dan hasil pekerjaan yang tidak rapi (84,65%). Kesimpulan: Analisis AHP menunjukkan bahwa kontrak lumsum memiliki risiko lebih tinggi (75,12%) dibandingkan kontrak harga satuan (24,88%).
Digital Based Estimation of Residential Property Losses from Liquefaction in West Jakarta Maryati, Indah; Zaki, Muhammad; Pontan, Darmawan; Widiarso, Tulus
Technomedia Journal Vol 10 No 2 (2025): October
Publisher : Pandawan Incorporation, Alphabet Incubator Universitas Raharja

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33050/tmj.v10i2.2500

Abstract

Liquefaction poses a significant threat to urban areas with water-saturated alluvial soils, especially in seismically active zones like West Jakarta. Using Cone Penetration Test (CPT) data from 25 locations, soil susceptibility was evaluated through Cyclic Stress Ratio (CSR), Cyclic Resistance Ratio (CRR), and Magnitude Scaling Factor (MSF). Areas with safety factor (FS) values below 1 were identified as having high liquefaction potential. Residential buildings were categorized by floor area and assessed using the 2024 Government Property Sales Value (NJOP) to estimate potential financial loss. Structural damage percentages were determined using seismic intensity thresholds and empirical damage functions. Analysis showed that residential areas with moderate to loose soil conditions, particularly in the northern and western zones, are most vulnerable. The total estimated loss reached IDR 189.8 billion, with the highest concentration of damage in medium and large sized residential properties. These findings emphasize the critical need to integrate geotechnical parameters into spatial risk mapping and urban disaster mitigation planning. A digital loss estimation model combining soil characteristics, seismic parameters, and economic valuation provides a scalable approach for early warning systems and resilience-oriented urban planning. The study contributes to data-driven risk management strategies aligned with sustainable development objectives and adaptive infrastructure policies.
PERWUJUDAN ARSITEKTUR BIOKLIMATIK PADA BANGUNAN “RUANG INTAN” DI KOTA TUA JAKARTA Fatmawati, Nur Aziziyah; Widiarso, Tulus; Susetyarto, Martinus Bambang
JURNAL PENELITIAN DAN KARYA ILMIAH LEMBAGA PENELITIAN UNIVERSITAS TRISAKTI Vol. 11 No. 1 (2026): Januari 2026
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/pdk.v11i1.23908

Abstract

Permasalahan lingkungan perkotaan seperti peningkatan suhu, keterbatasan ruang terbuka hijau, dan kebutuhan ruang baru mendorong perlunya pendekatan arsitektur yang lebih kontekstual dan berkelanjutan. Studi ini bertujuan untuk mewujudkan arsitektur bioklimatik pada perancangan bangunan “Ruang Intan” di kawasan Kota Tua Jakarta. Metodologi yang digunakan mengacu pada tahapan experimental methods yang dikemukakan oleh Achtenn (2009) Hasil perancangan menunjukkan bahwa pendekatan bioklimatik mampu diterapkan secara kontekstual pada kawasan cagar budaya tanpa mengganggu karakter historis sekitarnya. Meskipun studi ini bersifat teoritis dan belum melalui uji implementasi secara langsung, temuan ini memberikan dasar bagi pengembangan desain berkelanjutan di kawasan heritage tropis lembap. Studi lanjutan disarankan untuk melibatkan simulasi performa termal dan analisis kenyamanan pengguna. 
Identifikasi Karakteristik Bangunan Mixed-Use Berdasarkan Tipologi, Konfigurasi Fungsi Dan Kinerja Ruang Situngkir , Michael; Purnomo , Agus Budi; Widiarso, Tulus
Metrik Serial Teknologi dan Sains Vol. 7 No. 1 (2026): februari
Publisher : Konsorsium Cendekiawan Indonesia

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

Abstract

Bangunan mixed-use dikembangkan sebagai respons terhadap keterbatasan lahan perkotaan serta kebutuhan integrasi berbagai aktivitas dalam satu kesatuan ruang. Berbagai kajian menunjukkan adanya keragaman pendekatan dalam meninjau karakteristik bangunan mixed-use. Penelitian ini merupakan studi pustaka yang bertujuan untuk mengidentifikasi karakteristik bangunan mixed-use dengan fokus pada tiga aspek utama, yaitu: (1) tipologi; (2) konfigurasi fungsi yang meliputi zonasi, transisi ruang, pemisahan akses, dan sirkulasi; serta (3) kinerja ruang yang mencakup efisiensi ruang dan core serta performa sirkulasi dan akses. Pustaka yang dikaji berasal dari artikel jurnal yang diseleksi berdasarkan kesesuaian substansi dengan ketiga aspek tersebut melalui proses penyaringan judul dan abstrak, dilanjutkan dengan telaah teks penuh. Data yang diperoleh diekstraksi ke dalam matriks dan dianalisis menggunakan metode thematic coding. Hasil kajian menunjukkan bahwa: (1) tipologi bangunan mixed-use dapat dibedakan berdasarkan komposisi fungsi dan pola susunan vertikal; (2) konfigurasi fungsi ditentukan oleh keseimbangan antara tingkat integrasi aktivitas dan kebutuhan privasi serta keamanan; dan (3) kinerja ruang dipengaruhi oleh rancangan core, bentuk massa bangunan, serta pola sirkulasi dan pencapaian. Temuan ini dapat digunakan sebagai indikator pembeda antar bangunan mixed-use. Namun, agar indikator yang dihasilkan bersifat lebih komprehensif, diperlukan kajian lanjutan yang mencakup aspek-aspek karakteristik lainnya.
Cost Analysis of Construction Using the Cost Significant Model and Artificial Neural Network or Feasibility Study Cost Estimation in Process Industry (Case Study: Feasibility Study Projects in the Process Industry Sector in Indonesia) Isma Fajar; Muhammad Zaki; Darmawan Pontan; Tulus Widiarso
Eduvest - Journal of Universal Studies Vol. 5 No. 7 (2025): Eduvest - Journal of Universal Studies
Publisher : Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59188/eduvest.v5i7.50381

Abstract

The process industry plays a vital role in the global economy, with increasing complexities requiring significant capital investment for projects. Accurate cost estimation in the early stages is critical to avoid cost overruns, delays, and poor quality. During the feasibility study phase, accurate cost estimation is crucial for project success. This study employs the cost significant model (CSM) to identify key cost elements influencing the total construction cost and compares the model's accuracy with actual costs in 50 process industry projects in Indonesia from 2010 to 2024. Artificial Neural Networks (ANN) with backpropagation are also used to validate the model and calculate the Mean Absolute Percentage Error (MAPE) for accuracy assessment. Analysis identifies significant cost components such as Mechanical ISBL (55.89%), Mechanical OSBL (7.65%), Electrical (6.06%), and Superstructure (15.07%), collectively contributing 84.66% of total costs. ANN-ALL achieves the highest accuracy (L: -4.76%, H: 0.55%), followed by CSM Model 3, ANN-CSM, and others, as per AACE International guidelines. Models exceeding Class 4 benchmarks are unsuitable for feasibility studies. Data analysis combines regression using SPSS and ANN modeling with MATLAB, highlighting the ANN-ALL model's superiority in cost estimation accuracy.
The Effect of Soil Survey Adequacy on Engineering Design Details (DED) on Potential Cost and Construction Time Savings Ilham Akbar Mulya Wibawa; Bambang Endro Yuwono; Darmawan Pontan; Tulus Widiarso
Eduvest - Journal of Universal Studies Vol. 5 No. 7 (2025): Eduvest - Journal of Universal Studies
Publisher : Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59188/eduvest.v5i7.50870

Abstract

The construction of the Kadusirung Dua Underpass Project in Banten aimed to improve access routes but encountered landslides during execution, necessitating design changes and additional soil investigations. This study examined the impact of inadequate soil surveys on engineering design, focusing on cost and time efficiency. The research objectives were to analyze the effects of design changes during construction, compare initial and revised designs, and evaluate savings potential if proper soil investigations were conducted initially. Using secondary data from the project, the study employed Microsoft Project for time-cost analysis and applied the Cost of Change vs. Opportunity to Influence theory. Findings revealed that design changes during construction increased costs by Rp 43.6 billion and extended the timeline by 566 days. Conversely, comprehensive soil surveys at the planning stage could have saved 25% of the time (237 days) and 18% of costs (Rp 38.9 billion). The implications highlight the critical need for thorough geotechnical investigations early in projects to mitigate delays and cost overruns. The study underscores the importance of adhering to soil testing standards (SNI 8460:2017) and optimizing design decisions during planning to enhance project efficiency.
Co-Authors Agus Budi Purnomo Antoni, Febri Ardilla Jefri Karista Bambang Endro Yuwono Canthika Nada Darmawan Pontan Endah Kurniyaningrum Fabyanto, Ikhsan Fajar Isnaini, Rohimah Fatmawati, Nur Aziziyah I Gede Oka Sindhu Pribadi Ilham Akbar Mulya Wibawa Inavonna, Inavonna Isma Fajar Kardiani, Rani Khansseler, Gery Lili Kusumawati Maryati, Indah Mohammad Ischak Muhammad Zaki Muhammad Zaki Nityasa Kirana, Kinantya Noer Fadly Nur Syah, Azzahra Pontan, Darmawan Purnomo , Agus Budi Purnomo, Endhi Ibuhindar Rahma Ningsih , Nisrina Reza Fauzi Rintawati, Dewi Rose, Ugahari Saihul Anwar Saihul Anwar Salman - Salman Salsabilla Sari, Christina Sindhu Pribadi , I.G Oka Situngkir , Michael Sugeng Riyanto Sugeng Riyanto Suhartini Suhartini Susetyarto, Martinus Bambang Syamsiar, Syamsiar Tundono, Sri Veby Irawandi Wijayanto , Punto Wildan, Dwiki Zayadi, Ruwaida