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INDONESIA
Rekayasa Sipil
Published by Universitas Brawijaya
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Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture
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Articles 551 Documents
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The Influence Of Risk Management Culture On Project Time Control In Construction Projects: A Random Forest Approach Kartika Sari, Feby; Nugroho , M. Sapto; Prasetyo, Ryan Faza; Faisal, Ulfa Fatmasari; Wijaya, M. G. Wisnu; Bonastria, Citra Mira Dewi
Rekayasa Sipil Vol. 20 No. 1 (2026): Rekayasa Sipil Vol. 20 No. 1
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.2026.020.01.5

Abstract

Managing time is crucial in construction projects, as schedule deviations caused by complexity and external risks often lead to costly delays. This study aims to analyze how risk management culture influences time control in high-rise building construction projects. A mixed-methods approach was employed: first, risk management culture variables were qualitatively identified through in-depth interviews; then, a quantitative analysis was conducted using questionnaires distributed to project managers, construction managers, and financial managers. The data were analyzed with the Random Forest algorithm, chosen for its predictive accuracy. Risk management culture variables (X1–X23) were adapted from ISO 31000:2018, while project time control was measured using the Schedule Performance Index (SPI). The results indicate that a risk management culture has a significant and positive impact on project time control. The most influential factors were the documentation of the risk register (X23), the integration of risk evaluation into decision-making (X16), and continuous monitoring and review (X20). Conversely, formal aspects, such as risk management policies (X2) and training programs (X11), showed a relatively lower influence. These findings suggest that active implementation of risk management culture in daily operations contributes more directly to improving schedule performance. The study highlights the importance of accurate risk documentation, risk-informed decision-making, and adaptive monitoring as priorities for achieving effective time control in construction projects.
Fuel Consumption Losses and Traffic Performance as a Consequence of Universitas Islam Indonesia Faculty of Law Building at Simpang Pamungkas, Kaliurang, Yogyakarta Laziqoh Zahatul Tolab; Miftahul Fauziah
Rekayasa Sipil Vol. 20 No. 1 (2026): Rekayasa Sipil Vol. 20 No. 1
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.2026.020.01.6

Abstract

This study analyzes the impact of traffic performance at Pamungkas Intersection, Kaliurang, Yogyakarta, after the relocation of the Faculty of Law of Universitas Islam Indonesia to the Integrated Campus. The relocation has significantly increased traffic volume, resulting in congestion and a decline in intersection performance. This study aims to assess current traffic conditions, forecast future scenarios, and propose effective alternative solutions to enhance traffic flow. Additionally, to determine the fuel consumption and operational costs of the vehicle. The methodology employed was a descriptive, quantitative approach, utilizing both primary and secondary data collection. Primary data included intersection geometry conditions, vehicle volume, and queue length, while secondary data included the population of Sleman Regency. The analysis is based on PKJI 2023, and the level of service is based on PM No. 96 of 2015. The results showed that the intersection currently operates at a Level of Service (LOS) of F, with a degree of saturation exceeding 0.85. Two alternative improvement scenarios were proposed: (1) signal redesign and reduction of side barriers, and (2) the same with road widening. Although both alternatives reduce the degree of saturation, Alternative 2 exhibits relatively better performance, while still maintaining LOS F. In terms of environmental impact, Alternative 2 results in lower fuel consumption and thus reduced emissions. The highest vehicle operating cost is recorded for medium passenger cars (MP) at IDR 14,869.86/km, followed by motorcycles (MC) and medium-sized vehicles (KS).
Analysis of the Implementation of Building Information Modeling (BIM) at the Ministry of Public Works and Housing (MPWH) RAKHMAN, NOFA FATKHUR; TENRISUKI TENRIAJENG, ANDI
Rekayasa Sipil Vol. 20 No. 1 (2026): Rekayasa Sipil Vol. 20 No. 1
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.2026.020.01.7

Abstract

BIM has been integrated across various project phases, from planning and execution to operations and maintenance. Despite its growing adoption, limited studies have systematically measured BIM maturity within Indonesia’s public sector, particularly under the Ministry of Public Works and Housing (MPWH). This study, therefore, seeks to fill that gap by evaluating the extent of BIM implementation in construction projects, with a focus on its effectiveness in enhancing cost efficiency, quality, and time management. A descriptive research method was applied, using manual data analysis derived from internal monitoring reports, questionnaire responses, and literature reviews. The level of BIM implementation was assessed across three core dimensions: technology, processes, and policy frameworks. These were measured using the BIM Maturity Index (BIMMI), which showed maturity levels ranging from “Managed” to “Integrated,” depending on the sub-category. On average, BIM adoption within the ministry is categorized at the “Managed” level, with a BIMMI score of 55%. Readiness across technological infrastructure, operational procedures, and regulatory frameworks varies widely among organizational units. For instance, the Directorate General of Highways (DGH) achieved an “Optimised” level with a score of 83% and could serve as a national benchmark. In comparison, the Directorate General of Human Settlements (DGHS) reached an “Integrated” level at 73%. In contrast, the Directorate General of Water Resources (DGWR) and the Directorate General of Housing (DGH) showed much lower maturity levels, at 37% and 13% respectively, particularly in contractual policy readiness, which remains at an “Ad-hoc” level (27%). The findings highlight a research question central to this study: How do variations in policy readiness and technological infrastructure influence BIM maturity across MPWH units? The results support the hypothesis that policy readiness is the most decisive factor limiting BIM integration, offering novel insights for designing targeted national strategies to accelerate BIM adoption.
Literature Review of Occupational Safety and Health Risk Management in Foundation Work Susanto, Tri; Nurdiana, Asri; Wibowo, M. Agung; Maromi, M. Izeul
Rekayasa Sipil Vol. 20 No. 1 (2026): Rekayasa Sipil Vol. 20 No. 1
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.2026.020.01.8

Abstract

Identifying risks in construction projects is essential for anticipating hazards and developing effective risk management measures. The intricacy of construction projects encompasses numerous aspects that can impact their effective completion, including the risk of worker accidents in the field. This study aims to identify Occupational Safety and Health (OHS) risk factors in foundation work through a literature review using the Publish or Perish application. Literature was obtained through the Google Scholar and Crossref databases, with a maximum search limit of 100 articles, and was limited to the 2020–2025 period to ensure relevance to current conditions. Search phrases used included risk management, risk identification, occupational safety and health, and foundation, with literature selected based on the suitability of the title and its relevance to the research objectives. The study findings reveal 11 potential hazards, with five predominant risks: being struck by construction materials, being impacted or ensnared by heavy machinery, falling into dig sites, sustaining puncture or laceration injuries from sharp objects, and experiencing ocular ailments due to exposure to materials or dust. These findings affirm that foundation work presents a considerable hazard, necessitating the implementation of risk control hierarchy, such as elimination, engineering methods, administrative measures, enhancement of worker safety behavior, and adaptation to contextual dynamics to fortify the safety culture in construction projects.
Comparative Analysis of Building X's Fiber Polymer Composite and Conventional Method Beam Reinforcement Time Performance lutfiansyah, Yopi; Girsang, Hamonangan; Novika Candra F; Agus Supiyat
Rekayasa Sipil Vol. 20 No. 1 (2026): Rekayasa Sipil Vol. 20 No. 1
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.2026.020.01.9

Abstract

Initially, Building X in Jakarta functioned as a typical office building. Reinforcement was necessary because the building's purpose had changed to a bank office, which required a space for archives that necessitated a relatively large storage area. As is well known, if a structure bears too heavy a load or is not built properly, it will bend beyond its strength and split or break. The main factor is the change in buildings or other structures. The strength of a building's structure must be considered when it undergoes changes or additional loads, such as the addition of floors, increased loads, changes in the building's purpose, or alterations in its layout. The purpose of this study is to compare the performance time of beam reinforcement using the conventional method (jacketing) with Fiber Polymer composites in Building X. By examining the duration of each task specified in the detailed work structure, this methodology is based on empirical research and field observations. Based on the time study, it took 6 days to reinforce the beam structure using fiber polymer composites, compared to 17 days when using a jacketing system with concrete. Therefore, the use of fiber polymer composites resulted in a time efficiency of 64.7%.
Eco-Friendly Cellular Lightweight Concrete Partition Walls Using Sandblasting Waste for Seismic Mitigation Cahyono, Luqman; Dermawan, Denny; Pratiwi, Wiwik Dwi; Widiana, Dika Rahayu; Utomo, Agung Prasetyo; Fahmi, M. Rizal; Rosalina, Amanda; Suroidah, Eva Nur; Carina, Annisa; Oktaviastuti, Blima
Rekayasa Sipil Vol. 20 No. 1 (2026): Rekayasa Sipil Vol. 20 No. 1
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.2026.020.01.10

Abstract

The increasing demand for efficient construction materials has driven the popularity of lightweight bricks in the last decade. On the other hand, ship repair activities generate sandblasting waste, amounting to 2.5–3 million tons per year, which contains heavy metals and corrosive residues, and is therefore categorized as B3 waste. This study aims to transform sandblasting waste into environmentally friendly partition walls that support earthquake and fire disaster mitigation by formulating lightweight bricks of the Cellular Lightweight Concrete (CLC) type through the modification of foam agents and the substitution of fine aggregates. Initial studies, conducted through interviews at one of the shipyards, revealed an average monthly generation of sandblasting waste of 12,100 kg. This study combines laboratory experiments and a literature review to examine material properties, including gradation, specific gravity, water absorption, and metal content (XRF–TCLP), as well as to evaluate compressive strength, density, and potential applications in earthquake disaster mitigation. The characterization results indicate that the sandblasting waste meets the gradation requirements specified in SNI 03-2834-2000 and passes physical tests according to SNI 03-1970-2008, with heavy metal content (Ba, Zn, Cu) below the threshold set in PP No. 22 of 2021. Lightweight bricks are made with a composition ratio of 1:1 cement and sandblasting waste, and variations in the foam agent range from 5% to 12.5%. The best formula, according to SNI 8640-2018, is obtained at a foam agent content of 5%, resulting in a compressive strength of 7.28 MPa and a density of 1,283.33 kg/m³, which is lighter than concrete blocks and red bricks. From an earthquake mitigation perspective, it was found that lighter material weight contributed to reducing inertial forces and loads on the structure, thereby enhancing resistance to initial collapse and facilitating ease of dismantling during post-earthquake evacuation. These findings indicate that sandblasting waste has the potential to be processed into environmentally friendly alternative construction materials that not only meet technical standards but also contribute to earthquake risk mitigation strategies.
Thermal Performance of Banana Peel Biocomposites for Tropical Building Insulation Deni Priansyah; Benedicta Putri Pelealu; Dimas Handriyanto; Alya Putri Yulianti
Rekayasa Sipil Vol. 20 No. 1 (2026): Rekayasa Sipil Vol. 20 No. 1
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.2026.020.01.11

Abstract

The construction industry is a major contributor to global carbon emissions, largely due to the use of conventional materials with high thermal conductivity. This highlights the need for environmentally sustainable insulation materials aligned with circular economy principles. As the world’s fourth-largest banana producer, Indonesia generates vast amounts of banana peel waste that can be repurposed as an eco-friendly thermal insulation material.This study evaluates the thermal performance of banana peel-based biocomposite (BP80-PS20) as an insulation material for tropical buildings. The research employed a systematic literature review and numerical simulations using DesignBuilder software on a simplified model of a tropical house. Key parameters analyzed include thermal conductivity, U-value, and R-value, benchmarked against Indonesian (SNI 6389:2011) and international (ASHRAE 90.1-2019) standards. Simulation results indicate that BP80–PS20 significantly improves thermal resistance, reducing wall U-values from 2.97 to 0.68 W/m²K and partition U-values from 1.64 to 0.30 W/m²K, corresponding to an increase of over 300% in R-value. The insulated building maintained indoor temperatures between 24.5°C and 27.2°C, which fully falls within the SNI and ASHRAE comfort zones. These findings confirm that banana peel waste can serve as a sustainable thermal insulation material, enhancing building energy efficiency and promoting green construction practices in tropical climates.
Global and Local Buckling Behavior of Bracing Members with Slotted-in Web Openings Firdausy, Ananda Insan; Lin, Chong-Jun
Rekayasa Sipil Vol. 20 No. 1 (2026): Rekayasa Sipil Vol. 20 No. 1
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.2026.020.01.12

Abstract

This study examines the global and local buckling behavior of segmented bracing members with slotted-in web openings, designed to reduce the demand on the mid-segment. The web-opening ratios were designed as 0.03 and 0.015, with one to three openings introduced along the steel wide-flange in the mid-segment. The results from the hysteresis loops indicated typical buckling-type brace behavior for most specimens, except for the specimen with a web-opening ratio of 0.015, which exhibited an unfavorable cyclic response with low stability. Specimens with a web-opening ratio of 0.03 demonstrated stable global buckling predominantly about the weak axis. In contrast, those with a ratio of 0.015 exhibited irregular global buckling that also involved strong-axis deformation. Similarly, specimens with a ratio of 0.015 exhibited irregular, deformed shapes and more severe local buckling around the web openings, whereas those with a ratio of 0.03 displayed more uniform deformation patterns. The specimen with two slotted-in web openings and a ratio of 0.03 achieved the highest buckling strength, as global buckling did not initiate at the web opening location, resulting in superior stability performance. Overall, specimens with a 0.03 web-opening ratio exhibited more favorable global and local buckling behavior, as well as higher buckling strength, compared to those with a ratio of 0.015.
Analysis of Building Structure Dynamics Due to Earthquake Loads Mely Anisa; Lindung Zalbuin Mase; Hardiansyah Hardiansyah; Rena Misliniyati; Khairul Amri
Rekayasa Sipil Vol. 20 No. 1 (2026): Rekayasa Sipil Vol. 20 No. 1
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.2026.020.01.13

Abstract

This study aims to assess the impact of earthquakes on the Professional Programme Lecture Building at the Faculty of Teacher Training and Education (FTTE), Bengkulu University, by integrating soil response analysis and structural dynamics. The research began with the collection of geological data at the research site. Seismic soil response analysis was conducted to assess soil movement at the end of the piles, followed by earthquake wave propagation to evaluate the building's response to earthquake activity using the Finite Element Method (FEM). Based on load ratio evaluations, beam B2 and column C2 on the second floor of the building were identified as having structural weaknesses. Therefore, retrofitting techniques were applied to increase the load capacity of the structure. The results showed that retrofitting provided significant improvements in structural performance. This research highlights the importance of integrating soil response analysis with structural dynamics to enhance the resilience and safety of buildings in earthquake-prone areas.
Spatial Analysis of Supporting Infrastructure for Coastal Tourism Areas in Province of the Special Region of Yogyakarta Ariani, Meisy; Nursetiawan; Novendri Darimolyo, Priyo
Rekayasa Sipil Vol. 20 No. 1 (2026): Rekayasa Sipil Vol. 20 No. 1
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.2026.020.01.14

Abstract

Tourism has become one of the strategic drivers of regional economic growth, particularly in areas with coastal potential. As a sector that integrates multiple economic activities, tourism not only generates foreign exchange but also stimulates trade, transportation, and the development of the creative industry. This study focuses on coastal tourism areas in the Special Region of Yogyakarta. It aims to: (1) compile an inventory of coastal facilities and infrastructure (MSP), (2) analyze the spatial distribution of coastal locations (ASP), (3) assess the relationship between facility availability and visitor numbers (AFP), and (4) evaluate the accessibility of key facilities to strategic points across tourism corridors (FPL). The field inventory identified 67 facility units across beaches in Bantul and 41 units in Kulon Progo, with notable disparities in availability and service quality. Spatial analysis using ArcGIS indicates that 62% of facilities are concentrated in Bantul, an area with higher accessibility and closer proximity to the urban center, while Kulon Progo accounts for only 38%. The AFP assessment further shows a moderate positive correlation (r = 0.54) between facility completeness and visitor volume, suggesting that areas with better infrastructure tend to attract more tourists. Overall, the findings highlight the uneven distribution of coastal tourism support facilities, underscoring the need for more equitable infrastructure planning and targeted spatial development policies.

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