REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development

Evaluasi Kinerja Operasional BRT Trans Jateng Koridor 1 dan 6: Pendekatan Faktor Muat (Load Factor)

Sat, 28 Feb 2026 00:00:00 +0000

The implementation of pilot Bus Rapid Transit (BRT) systems in metropolitan agglomerations, such as Trans Jateng, plays a pivotal role in providing affordable public transportation, enhancing regional connectivity, and fulfilling Minimum Service Standards (MSS). This study evaluates the operational performance of two specific Trans Jateng corridors: Corridor 1 (Semarang – Bawen) and Corridor 6 (Semarang – Grobogan). The primary focus of this research is the analysis of time-series load factor data to assess bus performance. Data were gathered through on-board surveys utilizing Global Positioning System (GPS) devices and structured survey instruments. The data collection was conducted over a period of two weekdays and one weekend day. The analytical results indicate that both corridors experience significant kelebihan penumpang during peak hours, with load factors exceeding 170% in Corridor 1 and 110% in Corridor 6. Furthermore, this study identifies distinct fluctuations in passenger demand patterns between weekdays and weekends, as well as variations between individual trips within the same corridor. The findings reveal a notable disparity in average load factors. In Corridor 1 during weekdays, the load factor for the Semarang – Bawen route was 55.73%, while the Bawen – Semarang route reached 38.81%; on weekends, these figures shifted to 60.46% and 40.03%, respectively. In Corridor 6, the weekday load factor for the Semarang – Godong route was 46.05% and 39.25% for the reverse direction, whereas weekend figures were recorded at 51.49% and 34.68%. Given that the ideal minimum load factor is 70%, more systematic operational management is necessitated to maintain optimal service performance. Proposed recommendations include the dynamic adjustment of fleet size to align with demand levels—particularly during peak periods—and the implementation of more adaptive capacity management strategies. Such measures are intended to regulate load factors during high-demand intervals, enhance passenger comfort, and improve the overall operational efficiency of the transit service.

Penjadwalan Berbasis Risiko dengan Program Evaluation and Review Technique untuk Mendukung Implementasi BIM 4D pada Proyek Jembatan

Sat, 28 Feb 2026 00:00:00 +0000

The construction industry plays strategic role in national infrastructure development, particularly in bridge projects that are characterized by high complexity and significant implementation uncertainty. Bridges function not only as physical connections between regions but also as critical infrastructure supporting public mobility and economic growth. Therefore, accurate scheduling methods that are capable of accommodating the risk of time delays are required. This study to analyze the total project duration of bridge project risk-based approach through the integration of three-dimensional Building Information Modeling (BIM 3D) and the Program Evaluation and Review Technique (PERT). The analysis begins with the development of three-dimensional bridge structural model using Tekla Structures to generate bill of quantity that includes structural material volumes. These quantity data basis for probabilistic duration estimation using PERT method through expert judgment, which involves optimistic time, most likely time, and pessimistic time. The BIM 3D modeling results indicate total reinforcement steel volume of 24,343.4 kg and concrete volume of 274.1 m³. Furthermore, risk-based scheduling using the PERT method analyzed with the Precedence Diagram Method (PDM) produces total project duration of 190 days with completion probability of 50%. This result indicates potential risk of delay that should carefully project time control

Simulasi Uji Beban Statis dengan Variasi Jenis Konstruksi pada Kekuatan Produk Stool Kayu Persegi

Bahtiar Rahmat — Sat, 28 Feb 2026 00:00:00 +0000

Furniture products still been one of the export commodities that required attention. Contributing a value of more than USD 1 billion, consistency in maintaining the quality of furniture products needed to be improved. The construction or joints in furniture products had been the parts most prone to defects, cracks, or even fractures due to external forces, both during testing and usage. Prototype product testing required more time and resources. As a result, a method had been developed to obtain strength test data without creating a prototype, known as the Finite Element Analysis (FEA) method. The objective of this study is to measure the joint strength of a stool assembled with three types of construction: dowel pin, biscuit lamello, and open tenon joints. The external load had been adjusted according to the Indonesian National Standard (SNI) in terms of force position, magnitude, and direction. The results of the static load simulation shown that the application of all three types of construction had been able to withstand an external load of 1100 N effectively. The maximum von mises stress, which had been 9.647 MPa, had still been far below the material's yield stress of 41.2 MPa. Additionally, the maximum deflection and strain had only been 0.198 mm and 8.640e-04, respectively, in the product with biscuit lamello construction. The dowel pin construction had also produced a maximum stress of 6.031 MPa, a strain of 4.247e-04, and a maximum deflection of 0.170 mm, with a safety factor of 7.11. However, overall, the application of open tenon construction had been more recommended, as it had achieved the best safety factor of 13.630, with the maximum stress experienced by the stool being only 3.670 MPa.

Pemodelan Causal Loop Diagram Percepatan Proyek terhadap Biaya dan Kualitas Konstruksi

Avrilia D. Maharani, Lila Ayu R. Winanda, M. Wijayaningtyas, Deviany Kartika — Sun, 01 Mar 2026 00:00:00 +0000

Construction project acceleration is a strategy commonly implemented to overcome schedule delays; however, its application often results in increased costs and reduced work quality when not managed in a systematic and integrated manner. This condition reflects the presence of complex and dynamic interrelationships among time, cost, and quality as the three main elements within the triple constraint framework, which cannot be adequately analyzed using linear approaches. Failure to understand the interactions among these three aspects may lead to project inefficiencies and decreased overall performance. Therefore, an approach capable of explaining cause–effect relationships and feedback mechanisms within construction project systems is required. This study aims to model the causal relationships between project acceleration, cost, and quality in order to obtain a structural understanding of their dynamic interactions. The research method employs a system dynamics approach using causal loop diagram modeling supported by Vensim PLE 10.4.0 software. The research stages include system definition to determine boundaries and identify key variables, model formulation based on a literature review to establish intervariable relationships, and the development of causal loop diagrams to illustrate interactions and feedback structures within the system. The modeling results indicate that the developed system consists of twenty feedback loops and forty-six one-way relationships representing interactions among acceleration, cost, and quality factors within the context of project acceleration. These findings confirm that project acceleration, cost, and quality are not independent variables but are dynamically interconnected. The proposed model provides a conceptual contribution to strengthening systemic understanding in construction project management and can serve as a foundation for strategic decision-making related to more effective and sustainable project acceleration

Pemodelan Struktural Dermaga dengan Variasi Tiang Pancang Menggunakan SAP2000

Sasti N. Rizkillah, E.I. Imananto, E.A. Yudianto — Tue, 03 Mar 2026 00:00:00 +0000

Wharf structures operate in complex marine environments and are subjected to significant lateral loads from berthing forces, sea currents, and wave actions that affect structural behavior and foundation performance. One common method to improve lateral resistance is the use of inclined piles, which convert part of the horizontal load into axial compressive force. This study develops a numerical structural model of a wharf with variations in pile inclination from vertical to inclined configurations, limited to the modeling stage. Finite element modeling is carried out using SAP2000 based on wharf geometry, material properties of concrete and steel, soil parameters from site investigation data, and service load combinations representing operational conditions. All pile inclination models are analyzed using identical parameters to ensure consistent comparison. The evaluated responses include axial force, shear force, bending moment, and global lateral displacement of the wharf. The results show that the vertical pile configuration produces the largest lateral displacement of 0.147 m and high bending moments, indicating a flexible lateral response. As pile inclination increases, axial force rises from 6,471.024 kN and reaches a maximum of 6,496.89 kN at an intermediate inclination, while bending moments gradually decrease. Lateral displacement is reduced and reaches a minimum value of 0.133 m at the same inclination. Further increases in pile inclination lead to higher shear force and a gradual increase in lateral displacement despite lower bending moments. These results confirm that inclined piles improve the lateral performance of wharf foundations, with intermediate inclination providing the most balanced response between axial force, bending moment, and lateral displacement

Peninjauan Kembali Kebutuhan Dimensi Saluran Drainase Sekunder di Kelurahan Balaroa Kecamatan Palu Barat

Alif Rizky Rizaldy, Rizaldi Maadji, Nur Hidayat, I Gede Tunas — Mon, 06 Apr 2026 00:00:00 +0000

Drainage conditions in Palu City still need attention, especially in the drainage in Balaroa Village, drainage dimensions that do not match the required dimensions can cause flooding problems because the channel cannot accommodate the design flood discharge. One of them occurred in the Secondary Drainage in Balaroa Village, West Palu Subdistrict, the narrowing of the drainage channel along 200 meters resulted in disruption of the function of the drainage. The purpose of this writing is to determine the performance and the need for appropriate dimensions in the Secondary drainage Balaroa West Palu District. The research process begins with the collection of secondary data in the form of rainfall data, population data and also primary data obtained through direct measurements in the field. Then the abnormality test is carried out, analyzing the frequency of rainfall using the log person type III method, calculating discharge discharge, design flood discharge, evaluating drainage capacity and calculating channel dimension requirements. The results showed that the results of the evaluation of drainage performance along the 560 meters, at STA 0+000 to STA 0+200 were not able to accommodate the design discharge where the results of the design flood discharge with a 10-year return period of 14,935 m³/s were obtained, with the existing channel capacity at STA 0+000 of 3,390 m³/s, then the calculation of channel dimension requirements with an average channel discharge of 22,450 m³/s was carried out so that in the future a channel with a capacity corresponding to the design flood discharge could be built

Pola Pergerakan Wisatawan dan Pengaruhnya Terhadap Permintaan Transportasi di Kota Pariwisata (Studi Kasus: Kota Makassar, Sulawesi Selatan)

Indriaty Wulansari — Mon, 06 Apr 2026 00:00:00 +0000

Modern tourists increasingly rely on app-based (online) transportation. This research is important as it highlights a shift in transportation preferences, serving as a reference for improving the quality of digital transportation services in tourist cities. The aim of this study is to analyze the movement patterns of tourists and their impact on transportation demand in Makassar, a major tourist city in Indonesia. Makassar attracts both domestic and international tourists with its cultural, historical, and marine tourism attractions. This research employs a survey method involving 200 tourist respondents visiting Makassar, supplemented by field observations and secondary data analysis. The findings show that the majority of tourists focus their visits on main attractions such as Losari Beach, Fort Rotterdam, and Trans Studio Makassar, with movement patterns dominated by the use of online transportation services. Moreover, there is a significant fluctuation in transportation demand during holiday seasons and weekends, with an increase in online transportation usage by up to 40% compared to regular days. Correlation analysis indicates a strong positive relationship between the intensity of tourist movements and the rising demand for transportation, particularly for online services and private vehicle rentals. This study concludes that a better understanding of tourist movement patterns can aid in designing more effective transportation policies in Makassar, including the development of more integrated and tourist-friendly transportation infrastructure.

Pengaruh Viatop66 dalam Aspal Penetrasi 60/70 Terhadap Kuat Tarik Campuran Hot Rolled Sheet Wearing Course (HRS-WC) Menggunakan Uji Indirect Tensile Strength (ITS)

Mashuri Mashuri; I Kadek Herdi Sanjaya — Sat, 11 Apr 2026 00:00:00 +0000

Hot Rolled Sheet Wearing Course (HRS-WC) pavement mixes are designed with a higher asphalt content, resulting in improved durability and flexibility, but are susceptible to rutting. However, caution should be exercised regarding cracking due to reduced flexibility. The purpose of this study was to determine the effect of Viatop66 in 60/70 penetration asphalt on the indirect tensile strength of Hot Rolled Sheet Wearing Course (HRS-WC) pavement mixtures using the Indirect Tensile Strength (ITS) test. The percentage of Viatop66 used as an additive in asphalt penetration 60/70 is 0.0%; 0.10%; 0.20%; 0.30%; 0.40% and 0.50%, respectively. The procedure for making the gap type HRS-WC mixture and determining the optimum asphalt content (OAC) uses the Marshall Method. The test specimen for Indirect Tensile Strength (ITS) testing uses asphalt content in OAC conditions with a VIM of 7.0%. The ITS test specimens has a diameter of 10.0 cm and a thickness of 6.4 cm. The ITS testing procedure uses SNI 6753:2015. The results of this study found that the addition of Viatop66 into 60/70 asphalt penetration 60/70 from 0.0%; 0.10%; 0.20%; 0.30%; 0.40% and 0.50% has increased the Indirect Tensile Strength (ITS) value of the Hot Rolled Sheet Wearing Course (HRS-WC) pavement mixture by 9.24%; 12.50%; 17.90%; 18.69% and 19.67% respectively against 0.0% Viatop66.

Generalized Additive Model Approach for Analyzing the Productivity of Irrigation Construction Workers

Sat, 11 Apr 2026 00:00:00 +0000

Labor productivity is a critical determinant of success in infrastructure development projects. This study investigates the dominant factors influencing the productivity of irrigation construction workers by integrating Generalized Additive Models (GAM) and Monte Carlo simulation. Using data analyzed in R Statistics 4.3.0 for Windows, we employed GAM to identify nonlinear relationships between productivity and predictor variables, followed by a permutation-based Monte Carlo resampling approach (100 simulations) to validate critical predictors. Results reveal that wage policies, availability of safety equipment, and managerial practices are the most significant drivers of productivity. Methodologically, this research contributes a novel framework combining GAM’s flexibility with Monte Carlo’s robustness to quantify uncertainty, evaluated via the coefficient of determination (R²). The permutation-based variable importance analysis underscores the practical relevance of these factors, offering actionable insights for optimizing workforce management in irrigation infrastructure projects.