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INDONESIA
Rekayasa Sipil
Published by Universitas Brawijaya
ISSN : -     EISSN : -     DOI : -
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture
Arjuna Subject : -
Articles 566 Documents
 53   54   55   56   57 
Determinants of Student Trip Frequency for Campus Transportation Planning: A Case Study of Universitas Muslim Indonesia Kasim, Muhammad Ridha; Akram, Andi Muhammad; Jihad, Ahmad
Rekayasa Sipil Vol. 20 No. 2 (2026): Rekayasa Sipil Vol. 20 No. 2
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2026.020.02.10

Abstract

This study explores the factors influencing the frequency of student trips to campus at Universitas Muslim Indonesia (UMI), with particular attention to vehicle group size, residential distance to campus, and selected academic characteristics. The analysis is based on primary survey data collected from 268 respondents and employs multiple linear regression as an exploratory analytical framework to examine relative behavioral influences on campus travel frequency. The results indicate that larger vehicle group sizes are associated with lower individual trip frequencies, while greater residential distance to campus is associated with higher individual trip frequencies. Although the regression model exhibits limited explanatory and predictive power, the findings provide useful insights into dominant student travel patterns and key behavioral drivers. Based on observed average trip frequencies, an indicative estimation of aggregate student trips suggests that campus travel demand is substantially concentrated on weekdays. The study emphasizes that the results should be interpreted as exploratory and planning-oriented rather than predictive forecasts. Nevertheless, the findings offer practical implications for campus transportation planning, particularly in promoting carpooling strategies, optimizing public transport integration, and managing weekday travel demand. These insights are expected to support evidence-based transportation policy development at UMI and comparable university campuses.
Comparative Assessment of Empirical Methods for Bored Pile Capacity Prediction Against Static Load Test Data in Indonesia Rahmat kurniawan; Chindy Akila; Rifky Fauzi; Ayu Sinta Aprilia; Yunita Asni; Ahmad Auliadi Y
Rekayasa Sipil Vol. 20 No. 2 (2026): Rekayasa Sipil Vol. 20 No. 2
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2026.020.02.11

Abstract

Accurate estimation of the bearing capacity of bored-pile foundations is essential to ensure both the safety and cost-effectiveness of foundation design. However, empirical design formulas are derived from simplified assumptions and may not fully represent actual soil–pile behavior in the field, leading to overestimation or underestimation of capacity if their performance is not carefully evaluated. This study compares the predictive performance of three SPT-based empirical methods—Meyerhof (1976), Reese & Wright (1977), and O’Neill & Reese (1999)—against Static Load Test (SLT) results interpreted using the Davisson, Chin, and Mazurkiewicz methods. A database of 10 bored-pile projects from various regions across Indonesia was analyzed. Given the limited sample size (n = 10), all findings are presented as preliminary evidence rather than definitive conclusions, and statistical estimates carry substantial uncertainty that should inform interpretation. Statistical evaluation employed correlation analysis (r, R²), bias factor (?), coefficient of variation (COV), and mean absolute percentage error (MAPE). Results indicate that the O’Neill & Reese method demonstrates the strongest correlation with Davisson-interpreted SLT results (R² = 0.853), while the Meyerhof method yields a mean bias factor closest to unity (? = 1.00). A performance ranking matrix is informed by concepts commonly adopted in LRFD calibration studies. These results indicate that differences in predictive performance reflect how each empirical formulation represents field behavior and suggest differentiated use of methods depending on the design stage. However, recommendations require validation against larger databases before widespread adoption.
Lean Maintenance Approach Optimization of Apartment Building Maintenance Based on Cost Performance Girsang, Hamonangan; Irvan Suwandi Hasan; Yopi Lutfiansyah; Elhazri Hasdian; Ernanda Dharmapribadi
Rekayasa Sipil Vol. 20 No. 2 (2026): Rekayasa Sipil Vol. 20 No. 2
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2026.020.02.12

Abstract

Based on the building maintenance report for the fiscal year 2022-2023 as received by the owner of a nine-story apartment building located in Indonesia, building repairs, maintenance, and similar activities were carried out and required due to several building components requiring repairs, such as roof leaks, water-stained ceilings, garden repairs, lighting, and so on, with a total repair cost of IDR 67,938,538.48 in the civil works, exceeding the planned annual budget. This aligns with customer feedback (VOC), which indicates that traditional maintenance methods may be less accurate at predicting the annual maintenance budget for a building. However, as building complexity increases, traditional maintenance management methods are no longer recommended. The importance of efficiency in the maintenance system has been demonstrated by a recent study that seeks to link lean principles to maintenance strategies. In this study, an evaluation of the maintenance system will be carried out using qualitative and quantitative methods based on the lean maintenance principles approach. From the results of the assessment carried out, the company gave high scores for all lean maintenance principles, namely identify the value (10/10), map the value stream (7.5/10), continuous flow (7.25/10), establish pull (7.75/10), and seek perfection (10/10). The system improvements needed are creating a value flow map (VSM) and implementing an ERP (Enterprise Resource Planning)-based material inventory for the management, monitoring, and processing of material information. The value-added ratio under the lean method increased from 14.67% to 77%, and maintenance costs were 51% lower.
Exploring Opportunities for Integrating Building Information Modeling with Circular Economy Principles in Construction: A Survey using Relative Importance Index Jumadi, Jiescodala; Negara, Kartika Puspa; Wijatmiko, Indradi
Rekayasa Sipil Vol. 20 No. 2 (2026): Rekayasa Sipil Vol. 20 No. 2
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2026.020.02.13

Abstract

The construction sector in Indonesia—especially in East Java—is expanding rapidly, yet this growth has intensified concerns about resource use, construction waste, and environmental impacts. In this context, adopting Circular Economy (CE) strategies, particularly the 3R principles (reduce–reuse–recycle), has become increasingly urgent. However, practitioners still lack clear, empirically grounded guidance on which Building Information Modeling (BIM)-enabled CE integration opportunities to prioritize for practical implementation in real project environments. To address this gap, this study conducted a purposive-sampling questionnaire survey of BIM-experienced professionals from construction companies with project experience in East Java and prioritized integration opportunities using the Relative Importance Index (RII), preceded by instrument validity and reliability testing. The results indicate that the instrument is statistically robust: all items are valid and demonstrate strong item–total relationships, with excellent internal consistency across the scale. The prioritization shows consistently high agreement across all proposed opportunities. Integrating BIM with green building certifications and standards emerges as the top priority, followed by BIM-based web tools that function as material and component banks to support traceability and circular use. Digital Twin integration and BIM-based decision-support systems form the next priority tier. At the same time, Visual Programming Language (VPL) automation and BIM–Life Cycle Assessment (LCA) implementation remain well perceived but are considered comparatively less urgent. Overall, this research provides a context-specific, evidence-based priority order of BIM–CE integration opportunities for East Java, offering actionable guidance for practitioners and supporting future BIM–CE implementation research in Indonesia.
Potential of Sandless Geopolymer Concrete Bricks for Soundproof Walls Masrafat, Hazen; Nurfain, Irfan; Bayuaji, Ridho; Tajunnisa, Yuyun; Alfayet, Muhamad Rifki
Rekayasa Sipil Vol. 20 No. 2 (2026): Rekayasa Sipil Vol. 20 No. 2
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2026.020.02.14

Abstract

This research explores the potential of sandless geopolymer bricks for application as soundproofing wall material. In this study, fly ash was employed as the primary binder in geopolymer concrete to substitute Portland cement, thereby reducing the environmental burden associated with conventional cement production. The geopolymer mixtures were prepared using a dry-mixing approach with varying proportions of coarse aggregate and binder. Three aggregate size ranges were investigated, namely 0.1–0.3 cm, 0.3–0.5 cm, and 0.5–1.0 cm. The performance of the resulting geopolymer concrete was evaluated through compressive strength, density, and sound transmission tests. The experimental results showed that specimens with larger aggregate sizes tended to exhibit higher compressive strength and density. In contrast, improved sound absorption was mainly associated with the development of pore structures within the material. These findings suggest that sandless geopolymer bricks have potential as an environmentally friendly material for soundproofing applications.
Readiness Factors for Hot Commissioning of Coal-Fired Power Plant Isnaeni Ali, Fachri; Toriq Arif Ghuzdewan; Ashar Saputra
Rekayasa Sipil Vol. 20 No. 2 (2026): Rekayasa Sipil Vol. 20 No. 2
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2026.020.02.15

Abstract

The successful execution of coal-fired power plant projects depends heavily on the effectiveness of the commissioning phase, particularly the hot commissioning stage, which marks the transition from construction completion to commercial operation. Inadequate readiness at this stage often leads to operational disturbances, repeated testing cycles, and delays in achieving commercial operation. Despite its critical role, commissioning readiness has received limited attention in existing readiness research, which predominantly focuses on pre-construction and early construction phases. This study aims to identify and prioritize readiness factors that significantly influence the successful execution of hot commissioning activities in coal-fired power plant projects. A survey-based quantitative research design was adopted, supported by qualitative thematic synthesis. Readiness factors were identified from the relevant literature and commissioning standards, classified into thematic categories, and evaluated using a structured questionnaire administered to experienced commissioning practitioners. The collected data were analyzed using mean score analysis and the Relative Importance Index (RII). The results indicate that all identified readiness factors are perceived as important, with eight factors classified as high priority (RII ? 0.90). The highest-ranked readiness factors include human resource capability and labor productivity readiness (RII = 0.9539), project team and organizational structure readiness (RII = 0.9415), and control, protection, and instrumentation system readiness (RII = 0.9385). These findings demonstrate that hot commissioning readiness is not determined solely by technical system completion but is strongly influenced by organizational capability, procedural discipline, and system reliability. This study contributes to readiness research by positioning commissioning readiness as a distinct and critical project phase. It provides quantitative, evidence-based guidance for prioritizing readiness efforts to support effective and timely hot commissioning.

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