JICE (Journal of Infrastructural in Civil Engineering)

ANALYSIS OF THE EFFECT OF DYNAMIC LOADS ON LRT JABODEBEK WHEEL FLANGE WEAR

Thu, 30 Apr 2026 21:17:48 +0700

Wheel wear is an important issue in the maintenance of rail-based transportation systems, particularly in the Jabodebek LRT system, which operates intensively in urban areas. This study aims to analyze the effect of dynamic loads on the rate of wear and to evaluate wheel life based on operational variations and track geometry. The research data includes primary data (interviews and wheel documentation) and secondary data (technical specifications, operational data, and track parameters) validated through triangulation. The analysis was conducted using a quantitative approach with dynamic load calculations referring to the Handbook of Railway Vehicle Dynamics and wear rates using Archard's Law corrected for geometric factors. The results show that the highest wear occurs on tracks with a curve radius < 125 m, which is predominantly triggered by lateral and centrifugal forces. Linear regression analysis shows a significant relationship between maximum dynamic load and daily wear rate (R² = 99.7%). These findings confirm that wheel life on narrow curved tracks is shorter than on straight tracks. This research contributes to the development of academic studies in the field of railway engineering, particularly in wear modeling and dynamic load analysis in rail transportation systems. From a technical perspective, the results of this modeling can be applied as a basis for optimizing predictive maintenance schedules and wheel reprofiling intervals. Furthermore, these findings provide strategic recommendations for evaluating operational speed limits on tight curves to reduce lateral forces, which has direct implications for enhancing the service life efficiency of rolling stock assets and operational reliability.

ANALYSIS OF RAIL WEAR AND PREDICTION OF SERVICE LIFE AT THE FATMAWATI CURVE OF MRT JAKARTA

Tue, 05 May 2026 20:32:56 +0700

Urban mass transit systems, such as the Jakarta Mass Rapid Transit (MRT) support high mobility but face track maintenance challenges from rapid degradation. Rail wear is the gradual loss of material due to repeated wheel rail contact while the contributing factors include friction, forces, accumulated passing tonnage, environmental conditions, material quality, and lack of lubrication. The Fatmawati Curve, characterized by a sharp 180-meter radius, exhibits one of the highest wear rates along the MRT Jakarta line due to intense dynamic forces. This study comprehensively analyzes the rail wear rate and its contributing factors at this critical location, while predicting the remaining rail service life using Simple Linear Regression and the theoretical AREA (American Railway Engineering Association) method. Empirical data were obtained from precise measurements conducted by the Civil Permanent Way Maintenance (CPWM) team of PT MRT Jakarta from May 2024 to June 2025 on both the Up Track and Down Track. The analysis results indicate that horizontal wear is the dominant degradation mechanism on this curve, progressing significantly and exceeding 5 mm after 84 months of operation, while vertical wear remains minimal at below 1.5 mm. Based on the maximum wear limits stipulated by national regulations (Permenhub No. 32/2011), the Simple Linear Regression model estimates that the critical wear limit will be reached between 2029 for the Down Track and 2030 for the Up Track. In contrast, the AREA method provides a longer, theoretical service life estimation extending to 2035 because it primarily accounts for material fatigue limits rather than physical field wear. Because the linear regression projections more accurately reflect actual aggressive field conditions, proactive track maintenance interventions such as optimized track lubrication, geometric control, and scheduled rail replacement at the Fatmawati Curve are highly recommended prior to 2029 to prevent technical failures and ensure long-term operational safety.

KAJIAN EMPIRIS HUBUNGAN PLATOON, JARAK ANTAR KENDARAAN DAN KESELAMATAN TRANSPORTASI JALAN

Bayu Martanto Adji, Hendra Gunawan, Krisna Monica, Nur Aurellia Fatinah Luthf — Sat, 27 Jun 2026 09:44:22 +0700

This study analyzes traffic characteristics along the Padang–Bukittinggi primary arterial corridor, focusing on vehicle platooning, spacing, and stopping sight distance (SSD) as operational safety indicators. Field data were collected through video recordings at Km 32, with vehicle classification, speed, and platoon formation identified using a critical headway threshold of ≤ 2.5 seconds.Traffic flow is dominated by light vehicles (> 70%), with medium heavy vehicles accounting for 25%, and large trucks and buses contributing less than 3%. Speed distribution within platoons is concentrated in the 40–60 km/h range, which increases capacity but reduces safety due to short spacing and insufficient SSD. Most vehicles in platoons operate with SSD ≤ 180 m, suitable for low–medium speeds but unsafe at higher speeds due to reduced safety margins. Unsafe spacing is prevalent, with 81.9% of vehicles in the Padang–Bukittinggi direction and 66.5% in the Bukittinggi–Padang direction, averaging only 26–29 m. Average spacing values of 26.88 m (Padang–Bukittinggi) and 28.57 m (Bukittinggi–Padang) correspond to speeds below 40 km/h. However, the dominant operating speeds are 40–60 km/h, highlighting a mismatch between actual spacing and safety requirements. This condition reflects dense traffic dominated by light vehicles, where drivers maintain short gaps to sustain flow, but at the expense of operational safety.

BINARY LOGISTIC REGRESSION MODELING OF MOTORCYCLE RIDER BEHAVIOR ON THE IMPLEMENTATION 0F ELECTRONIC TRAFFIC LAW ENFORCEMENT IN PADANG CITY

Sindy Aprila Nisma, Angelalia Roza, Kastamto — Mon, 06 Jul 2026 15:15:29 +0700

Traffic violations by motorcyclists remain a persistent problem in Indonesian cities. Padang City officially implemented an Electronic Ticketing (ETLE) system on March 23, 2021, at five priority intersections. However, violations continued to occur, indicating that the system's presence alone has not been sufficient to change motorcyclist behavior. This study aims to: 1) determine the characteristics of violations at five ETLE locations in Padang City, 2) identify factors that influence motorcyclist behavior toward ETLE implementation, and 3) obtain a binary logistic regression equation model for analyzing motorcyclist behavior toward ETLE implementation. Data were collected through observation, interviews, questionnaires, and documentation from 400 respondents (80 per location). Descriptive and binary logistic regression analyses were applied. Results show that violators were predominantly female, aged over 17 years, held a Class C driving license for more than five years, did not take the practical exam to obtain it, were in less stable emotional conditions, had never received ETLE socialization, and had never received an electronic ticket sanction. Binary logistic analysis identified two significant factors: the length of time to obtain a Class C driving license (X1) and whether the respondent took the theory/practical exam (X2), with a combined influence of 32.3% on ETLE compliance (Nagelkerke R² = 0.323). The resulting regression model is: Y = −1.137 + 1.502X1 + 1.738X2. These findings suggest that licensing quality and driver education are key levers for improving compliance with electronic traffic enforcement systems.

INOVASI PERKERASAN KAKU BERKELANJUTAN: TINJAUAN SISTEMATIS BETON HIJAU DARI PERSPEKTIF MATERIAL DAN LINGKUNGAN

Mon, 06 Jul 2026 15:26:17 +0700

With its contribution reaching approximately 8% of total anthropogenic CO₂ emissions globally, the cement manufacturing sector stands as one of the most carbon-intensive industries in existence — and road construction, as its primary consumer, shares a substantial portion of that environmental burden. This study aims to systematically synthesize empirical findings from previous research on green concrete in rigid pavement applications, focusing on material performance and environmental impact. Following a systematic literature review protocol, 62 articles selected from Scopus, Web of Science, and ScienceDirect databases (2014–2024) were comprehensively analyzed; of this full corpus, 21 references with the most representative and significant findings are cited in the bibliography as the primary citation base for this article. Synthesis results confirm that the three primary SCMs — fly ash (optimal ratio: 20–40%), GGBS (30–50%), and rice husk ash/RHA (10–15%) — maintain or enhance compressive and flexural strength at optimal substitution levels, with RCPT values 40–60% lower than conventional concrete. Hybrid SCM combinations demonstrate superior synergistic performance. From an environmental perspective, SCM substitution consistently reduces CO₂ emissions by 10–45% and embodied energy by 8–35%. The study also produces an evidence-based SCM selection matrix by design priority and implementation context, and identifies four critical research gaps.

POTENSI SINERGIS ABU CANGKANG KELAPA SAWIT (POFA) DAN ABU SEKAM PADI (ASP) SEBAGAI SUPPLEMENTARY CEMENTITIOUS MATERIALS PADA BETON RAMAH LINGKUNGAN

Muhammad Rizan Adam, Muhammad Chairi Munanjar, Hendra Putra Dipanegara — Thu, 09 Jul 2026 06:19:49 +0700

Palm oil and rice production constitute the two largest agro-industrial pillars of South Kalimantan Province, yet their combustion by products Palm Oil Fuel Ash (POFA) from crude palm oil (CPO) boilers and Rice Husk Ash (RHA) from rice mills remain largely unutilized waste streams posing environmental hazards. This systematic literature review analyzes the synergistic potential of POFA and RHA as Supplementary Cementitious Materials (SCMs) in green concrete formulation, examining physico-chemical characteristics, secondary hydration mechanisms, mechanical performance, durability, and CO₂ emission reduction implications. Synthesis of 32 Scopus-indexed studies (2009–2026) reveals: (1) POFA contains 56–65% SiO₂ with slow-stable reaction kinetics, optimal at 15–20% substitution; (2) RHA contains 85–95% amorphous SiO₂ with high reactivity, optimal at 10–15%; and (3) a binary blend of 10% POFA + 10% RHA enhances 56-day compressive strength by 15.0% and splitting tensile strength by 22.8% versus control, while reducing porosity by 19.7% and rapid chloride ion penetration (RCPT) by 55–58%. The synergistic effect operates through two complementary mechanisms: layered pore densification (POFA filling mesopores, RHA filling micropores) and differential pozzolan kinetics (RHA accelerates early Ca(OH)₂ consumption; POFA prolongs long-term C–S–H formation). Each 20% OPC replacement saves approximately 160–180 kg CO₂ per tonne of binder.

CHARACTERISTICS OF NON-AB VEHICLES ENTERING THE CITY OF YOGYAKARTA BY VEHICLE TYPE, ORIGIN AND TEMPORAL DISTRIBUTION

Fikri Nurahman, Nindyo Cahyo Kresnanto, Risdiyanto — Thu, 09 Jul 2026 06:24:17 +0700

Yogyakarta City, one of Indonesia's major tourism destinations, experiences significant traffic pressure from vehicles registered outside the local AB license plate region. This study analyzes the volume, composition, regional origin, temporal distribution, and traffic impacts of non-local vehicles entering the city. Traffic surveys were conducted over three consecutive days (15–17 May 2026) at the four main entrance corridors using the Manual Classified Count (MCC) method. Five vehicle categories were observed, while locally registered AB vehicles were excluded. A total of 16,447 non-local vehicles were recorded. Minibuses (57.4%) and sedans (31.7%) dominated the traffic, indicating tourism travel by families and small groups. Vehicles with plate B accounted for the largest proportion (24.0%), followed by AA (19.8%), H (11.4%), and AD (10.4%), with Central Java contributing approximately 52% of the total traffic. Peak traffic occurred during 08:00–12:00 and 14:00–17:00, reducing the estimated Level of Service (LOS) to D–E. The study recommends adaptive traffic management, park-and-ride facilities, restrictions on large buses in the city center, and Variable Message Signs (VMS).

ANALYSIS OF THE PRIORITY FACTORS INFLUENCING TOURISTS’ INTEREST IN VISITING YOGYAKARTA USING THE AHP METHOD

Erina Desira Manumpil, Nindyo Cahyo Kresnanto, Risdiyanto — Thu, 09 Jul 2026 06:25:34 +0700

This study investigates the priority factors influencing tourists’ interest in visiting the Special Region of Yogyakarta (DIY), Indonesia, using the Analytical Hierarchy Process (AHP). The research aims to identify the relative importance of the four key tourism dimensions (attraction, accessibility, amenities, and ancillary Services) and their corresponding sub-criteria to support evidence-based tourism development and infrastructure planning. Primary data were collected through pairwise comparison questionnaires distributed to 151 domestic tourists who had visited DIY within the previous year. Respondents were selected using purposive sampling, and individual judgments were aggregated using the geometric mean method before conducting the AHP analysis. Priority weights were calculated through eigenvector analysis, while the reliability of the pairwise comparisons was evaluated using the Consistency Ratio (CR), with all matrices satisfying the acceptable threshold (CR < 0.10). The results indicate that Accessibility is the most influential factor affecting tourists’ intention to visit DIY (0.32), followed closely by Attraction (0.31), while Amenities (0.19) and Ancillary Services (0.18) play complementary roles. At the sub-criterion level, transportation access emerged as the highest priority within Accessibility, cultural uniqueness was the most influential attraction factor, facility cleanliness ranked highest among Amenities, and tourism information was identified as the most important Ancillary Service. These findings demonstrate that improving regional connectivity should be complemented by preserving cultural identity, maintaining high-quality public facilities, and strengthening digital tourism information services. The study provides practical recommendations for tourism authorities and policymakers to prioritize infrastructure investment, cultural preservation, sanitation management, and integrated information systems to enhance destination competitiveness and improve the overall tourist experience in Yogyakarta.

ANALISIS KOMPARATIF TIPOLOGI FASADE BANGUNAN PADA KAWASAN KOTA LAMA DI INDONESIA

Thu, 09 Jul 2026 06:26:50 +0700

Each historic district in Indonesia carries a unique physical record of historical trajectories shaped by cultural dynamics, economic activity, and colonial power that persist as architectural strata to this day. Building facades serve as the most dominant element in reading the visual character of these districts, functioning as the direct interface between buildings and the public realm. Although facade typology studies in Indonesian historic districts have grown in number, most remain site-specific, and comparative understanding across districts is yet to be systematically established. This research aims to identify and compare building facade typologies across five Indonesian historic districts: Glodok (Jakarta), Braga (Bandung), Kembang Jepun (Surabaya), Kota Lama Semarang, and Kayutangan (Malang). A qualitative comparative approach drawing on secondary data from scholarly literature and academic visual documentation was employed. Five typological variables were systematically analyzed: architectural style, opening composition, facade materials, decorative elements, and roof form. The findings reveal that each district exhibits a distinctive facade typology shaped by a unique combination of historical background, cultural influences, urban functions, and development patterns. The main contribution of this research is the development of a comparative matrix of facade typologies across regions, which is an analytical tool that can be replicated for studies of other historic areas and also serves as the basis for preservation recommendations based on facade typology character.

EVALUASI KINERJA ATAP 3D SPACE TRUSS MENGGUNAKAN CHS PADA GEDUNG SPPG TIPE 3

Alya Tsabitah Zahra Alya, Euis Kania Kurniawati, Hartono — Wed, 15 Jul 2026 06:48:18 +0700

The Type 3 Nutrition Service Unit (SPPG) building requires a spacious, column-free workspace to support complex nutrition distribution activities. However, the existing design of this 20×20 m building still uses a conventional 2D roof truss system, which has limitations in terms of space capacity and structural stability. This study aims to redesign the conventional 2D roof truss into a 3D space truss based on Circular Hollow Section (CHS) steel pipes to compare the structural performance of the existing roof and the redesigned structure based on the requirements of SNI 1729:2020. The method used was a quantitative descriptive-comparative approach through structural modeling and analysis using ETABS software based on load parameters in accordance with SNI 1727:2020 and SNI 1726:2019. The results of the study indicate that the existing roof structure does not yet meet safety requirements due to the inability of compression members to resist buckling, whereas the proposed 3D space truss model meets the strength and axial force serviceability requirements in accordance with the standards. The proposed design meets the structural strength and stability requirements, provides a more even force distribution, reduces the stress ratio, and offers a wider column-free space to support the building’s functions. However, the use of a 3D space truss roof system with CHS profiles results in a greater self-weight of the structure compared to the existing roof structure. Thus, based on the results of the structural performance evaluation, a 3D space truss system using CHS steel pipes can be considered as an alternative for the design of wide-span roof structures.

ANALISIS TINGGI MUKA AIR BANJIR SEBAGAI DASAR PENETAPAN BATAS SEMPADAN SITU TERATE, KABUPATEN SERANG, BANTEN

Fri, 17 Jul 2026 17:09:28 +0700

Situ, a term used in Indonesia for small natural lakes, plays an important role in maintaining ecosystem balance and supporting the sustainability of water resources. In addition to functioning as a water storage body, a situ also serves as a water conservation area, flood control facility, groundwater recharge zone, raw water source, irrigation water supply, freshwater fish habitat, and recreational area. Delineation of the situ waterbody boundary is an essential step in protecting its ecological functions and controlling land use development in the surrounding area. This study aims to determine the flood water level (FWL) of Situ Terate as a basis for defining the waterbody boundary. The determination of the flood water level was conducted through the integration of hydrological analysis, hydraulic modeling, and verification using historical flood information. The data used in this study consisted of DEMNAS (Indonesian National Digital Elevation Model), rainfall records for the period 2015–2024, and historical flood information obtained through field surveys and community interviews. Spatial analysis was performed using ArcGIS to delineate the catchment area and derive its hydrological characteristics, while hydraulic modeling was carried out using HEC-RAS 2D with design flood hydrographs generated by the HSS Nakayasu method. The results indicate that the simulated water surface elevation corresponding to the 50-year return period flood (Q50) was +17.107 m above mean sea level (amsl), which closely matched the historical flood elevation of +17.11 m amsl. Based on this verification, the flood water level of Situ Terate was established at +17.11 m amsl, resulting in a waterbody area of 22.10 ha. The findings of this study can be used as a basis for delineating the situ waterbody boundary and as supporting information for the establishment of the Situ Terate buffer zone in accordance with the applicable regulations.