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INDONESIA
Inersia : Jurnal Teknik Sipil dan Arsitektur
Published by Universitas Negeri Yogyakarta
ISSN : 0216762X     EISSN : 2528388X     DOI : -
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture
INERSIA is stand for INformasi dan Ekspose hasil Riset Teknik SIpil dan Arsitektur. This scientific journal is managed by the Department of Civil Engineering and Planning Education, Faculty of Engineering, Yogyakarta State University, in cooperation with the Persatuan Insinyur Indonesia (PII). It publishes and disseminates research results from lecturers and post graduate students from various universities in Indonesia, which has contributed to the development of science and technology, especially in the field of Civil Engineering and Architecture. INERSIA is published twice a year, in May and December.
Arjuna Subject : -
Articles 312 Documents
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Mode Choice and Spatial Distribution of Coal Transport in Jambi, Indonesia Nugroho, Nurman; Priyanto, Sigit; Triatmodjo, Bambang
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol. 21 No. 1 (2025): May
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v21i1.64336

Abstract

Coal is an important commodity for Jambi Province. Based on data from the Central Bureau of Statistics, in the first quarter of 2022, the value of coal exports reached 10.75% of the total export value. Apart from being exported, coal commodity is also used for domestic purposes. The transport used at this time is only through public roads. The use of these routes results in many problems such as traffic accidents, congestion, and social conflicts. Therefore, the number of vehicles allowed to pass on public roads is limited. This has resulted in the production target plan not being achieved, only 17.3 million tonnes out of 40 million tonnes in 2022. Hence the need for other routes for transport such as rivers, special roads, and railways. This research is intended to analyse coal transport trips using trucks, barges and railways. This research discusses the closest route, mode selection, and transport costs based on the distance travelled and the travel time of each mode. The search for the closest travel route is done by spatial analysis with Network Analyst on ArcGIS. Mode choice was analysed using the multinomial logit method. Meanwhile, transport costs are calculated based on the principle of generalised cost. Modelling results on the selection of mode, during the rainy season the most efficient mode is barging with a selected probability of 44%, while rail 28% and transport by truck 27%. During the dry season, the probability of transport by railway is 93%, barge 4% and truck 3%. The results indicate that the most efficient mode during the rainy season is barging and during the dry season transport by railway.
Effectiveness of Concrete Crack Repair Using Bacillus subtilis and Calcium Lactate Rahmawan, Rama Zaky; Erizal, Erizal; Putra, Heriansyah; Oktafiani, Pradyta Galuh; Sutoyo, Sutoyo
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol. 21 No. 1 (2025): May
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v21i1.71313

Abstract

Cracks facilitate aggressive substances entering the steel easily and cause corrosion of the reinforcement. There are several innovative methods for dealing with cracks in concrete, one of which is using bacteria. The purpose of using bacteria and CaL is to find out the role and effectiveness of repairing cracks in concrete. In outline, several methods and tests are carried out, including bacterial culture, test tube, concrete sample making, concrete curing, compressive strength testing, permeability testing, absorption testing, image processing testing, and microscopic testing. The test tube results showed that the highest mass of calcite was found in a solution of 2 ml of bacteria and CaL with a concentration of 65.4 g/L. The cracks appeared closed visually at 28 days of age. Through imageJ software, the crack repair rate in concrete reaches 95.94%. The effect of adding B. subtilis and CaL was proven to be able to close concrete cracks and increase the compressive strength of cracked concrete by 13.16%, reduce permeability by 53.12%, and absorption by 22.20%. This was confirmed by SEM testing and VHX-7000 observations which showed the presence of calcite crystals in the concrete pores and filled the concrete crack areas. This study elucidated that using bacillus subtilis bacteria and calcium Lactate in self-healing concrete is an effective technique to repair the concrete crack.
Spatial Characteristics of Permanent Relocation Housing in Disaster-Prone Areas of Cangkringan Naufal, Muhamad Rafif; Nareswari, Ardhya
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol. 21 No. 1 (2025): May
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v21i1.72739

Abstract

The Merapi relocation permanent residential settlements (huntap) are spread across 2 sub-districts, Cangkringan and Minggir. The relocation located in Disaster Prone Area (KRB) 2, an area with a high level of vulnerability. The settlements are in rural areas contoured by mountain slopes. This study aims to describe and identify the condition of the spatial character of huntap settlements from an accessibility perspective. Aspects that influence regional emergencies in the mitigation stage are the complexity of shelters, shelter buildings, land morphology, settlement accessibility and preservation facilities. This research was carried out qualitatively deductively with 18 objects of observation in the Merapi relocation huntap settlements. Data were collected from contour data (GIS-Google Earth), primary & secondary literature studies, observations and interviews. This classification is then analyzed based on physical characteristics in the form of buildings, land and preservation facilities. The character of the building  will influence the shape of the road pattern and the level of visibility. The morphological characteristics of the land  will influence the ease of mobility based on the shape of the road and human movement. The nature of preservation facilities will affect the level of wayfinding which residents can recognise their environment.. So to support the optimization of the success of the evacuation process, the main road is in a position parallel to the contour line, minimizing the potential for density accumulation. There is an open area between the grid so that the level of visibility is wider. Minimizing the number of intersections in areas that are segregated/separated from other areas. Adding access gates to the entrance and exit to prevent bottlenecks, accumulation in the gate area.. It is hoped that this study can be used as a reference, recommendation and basis for the government, architects, urban designers or planners in designing relocation shelters at other points.
Earthquake Hazard Analysis of National Vital Objects by Probabilistic Seismic Hazard Analysis Method in West Java Prayogo, Arif Zidan; Rorosanto, Zahrawani Ifada; Syahbana, Arifan Jaya; Maulita, Ika
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol. 21 No. 1 (2025): May
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v21i1.72915

Abstract

The Probabilistic Seismic Hazard Analysis (PSHA) method was used to analyze the level of earthquake hazard in West Java Province, Indonesia, which is located between two active tectonic plates. This research integrates literature study, earthquake data collection, and data processing to explore the influence of megathrust, background, fault, and combine earthquake sources on local and national vital objects in the region, such as Pusdik Kopassus, Presidential Palace, Cirebon PLTU, Geothermal Power Plant, Peacekeeping Mission Center (PMPP TNI), PT. PINDAD, PT DAHANA SUBANG, PLM GUNUNG SAWAL, Walahar Dam, PT Indonesia Power UJP Jabar 2 Pelabuhan Ratu, which have important roles in critical infrastructure, defense, and national resilience. The analysis shows variations in maximum ground acceleration between 0.40 g to 1.00 g for background earthquake sources, and 0.00 g to 1.00 g for fault earthquake sources. The research also underscores the importance of mitigation efforts and proper planning to reduce the potential impact of earthquakes in West Java, taking into account the crucial role of national vital objects in maintaining the stability and sustainability of the region. The implications of these findings reinforce the urgency to improve coordination between stakeholders in building earthquake resilience at the local and national levels, and highlight the importance of hazard curve analysis on national vital objects to inform the future of the region.
Millennial Generation Preferences for Subsidy House Selection in Kendal Regency Naufal, Muhammad Fadhiil Hardian; Sarwadi, Ahmad
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol. 21 No. 1 (2025): May
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v21i1.73443

Abstract

Housing is a fundamental human need providing shelter, security, and comfort. Preferences in housing vary among consumers, particularly across different generations. This study aims to identify millennial preferences in subsidized housing and the factors influencing these preferences in Kendal Regency. Quantitative research methodology was employed, utilizing exploratory secondary data collection. Variables included design, housing type, location, geography, and costs. Data collection involved both secondary and primary sources, with questionnaires distributed to 120 millennial beneficiaries of subsidized housing loans in Kendal Regency. Data analysis encompassed univariate and bivariate analysis. Chi Square test showing significant associations were found between income, occupation, age, and geographic location with housing preferences, highlighting the importance of economic and demographic factors in shaping housing decisions. Education, however, did not show a significant impact on these preferences. These findings underscore the need for targeted policies and marketing strategies to meet the diverse housing preferences of millennials in subsidized housing contexts.
Experimental and Numerical Study on the Comparative Flexural Behavior of Geopolymer Concrete Beams Based on Metakaolin and Fly Ash Purba, Luki Hariando; Hutagalung, Bartholomeus; Perangin-angin, Siwan
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol. 21 No. 1 (2025): May
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v21i1.78027

Abstract

This study investigates the flexural behavior of normal concrete (BN), fly ash-based geopolymer concrete (BGPF), and metakaolin-based geopolymer concrete (BGPM) through both experimental testing and Finite Element Method (FEM) analysis. The objective is to compare the mechanical properties, load-bearing capacities, and post-yield behavior of these materials. The experimental results indicate that normal concrete beams (BN) exhibited the highest performance in terms of cracking load, yield load, and maximum load, demonstrating both high strength and ductility. The fly ash-based geopolymer concrete (BGPF) showed lower strength than BN but still performed significantly better than the metakaolin-based geopolymer concrete (BGPM). BGPF displayed a more brittle behavior post-yield, with a sharp reduction in load-bearing capacity, making it less suitable for structures requiring significant post-yield deformation. The BGPM beams demonstrated the lowest mechanical performance, primarily due to insufficient curing. The metakaolin material was only heated to 200°C due to laboratory limitations, far below the optimal temperature of 700-800°C necessary for full geopolymerization. As a result, the BGPM beams remained brittle and exhibited minimal load-bearing capacity compared to BN and BGPF. FEM analysis, while providing useful insights into the flexural trends, tended to overestimate the load-bearing capacities and deflections across all beam types compared to experimental results. In conclusion, geopolymer concrete, particularly fly ash-based, shows promise as an alternative to traditional concrete, though its mechanical properties, especially ductility and post-yield behavior, require further optimization. The study highlights the importance of proper curing processes, especially for metakaolin-based geopolymer concrete, to fully realize its potential as a sustainable building material. Future research should focus on refining these processes to enhance the strength and flexibility of geopolymer concrete.
The Behavior of Reinforced Concrete Beams with Various Carbon Fiber Retrofitting Methods in Enhancing Stiffness Zai, Eben Oktavianus; Purba, Luki Hariando
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol. 21 No. 1 (2025): May
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v21i1.78313

Abstract

This study investigates the effectiveness of Carbon Fiber Reinforced Polymer (CFRP) sheets and rods in improving the structural performance of reinforced concrete beams. Three beam specimens were tested: a control beam (BN), a beam reinforced with CFRP rods (BTC), and a beam reinforced with CFRP sheets (BLC). The experimental evaluation focused on key parameters, including first crack load (Pcrack), yield load (Pyield), maximum load (Pmax), and deflections at critical points. The stiffness of the beams was assessed at both the cracking stage (Kcrack) and the yielding stage (Kyield). The results demonstrate that the beam reinforced with CFRP sheets (BLC) exhibited the highest improvements in stiffness, with an increase of 184.89% in Kcrack and 221.21% in Kyield compared to the control beam (BN). The CFRP rod-reinforced beam (BTC) also showed enhanced performance, but to a lesser extent, with increases of 72.69% in Kcrack and 64.78% in Kyield compared to BN. The data reveals that BLC significantly reduces deflection and enhances load-bearing capacity, particularly in resisting initial cracking and yielding. The discussion highlights that CFRP sheets provide superior stiffness improvement compared to CFRP rods, making them more suitable for applications where increased stiffness and reduced deflection are critical. While CFRP rods effectively increase the ultimate load capacity, their impact on stiffness is less pronounced than CFRP sheets. In conclusion, CFRP sheets offer a more effective reinforcement solution for enhancing stiffness and controlling deflection in concrete beams, especially in structures requiring high resistance to cracking and yielding.
Structural Performance Optimization of Multi-Story Steel Frames with Split-K EBF Bracing System Configuration Kusuma, Kadek Adyatma Teja; Nindyawati, Nindyawati; Sulaksitaningrum, Roro; Muhammad, Dzul Fikri
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol. 21 No. 1 (2025): May
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v21i1.78431

Abstract

Conventional steel frame structures tend to be susceptible to earthquakes, which can lead to significant economic and social losses. The earthquake disaster has motivated various technological exploration efforts to improve the seismic resilience of building structures. To strengthen the structure and prevent collapse, reducing the span length by adding bracing to the weak axis of the column proved effective. The addition of lateral stiffeners (bracing) to the elements of the frame structure is crucial in reducing lateral forces due to earthquakes in high-rise buildings. However, the researchers only focused on comparing the types of bracing used. Therefore, the purpose of this study is to optimize the structure of the steel frame multi-story building by innovating the configuration of bracing placement to match the composition of the building. To produce optimal results, the steel frame building model using bracing is varied in the placement of bracing with the middle model (BC1), the edge model (BC2), and the even model (BC3), so that the three models produce the effect of bracing placement on the building. The three building models will be analyzed using SAP200 to produce the performance of the steel frame building structure, including displacement, natural vibration periods, and base shear forces. From the overall analysis of the three models, it is shown that the evenness model (BC3) produces the most optimal structural performance. This is also shown by the fulfillment of all structural performance requirements based on the requirements of earthquake-resistant structures in SNI 1726-2019. The result of the buffer evenly provides a large displacement that occurs on the 3rd floor in the X direction which compared to other models has the smallest value, which is 20.13 mm. Based on the results of the analysis, it is known that the uniform model has the smallest natural vibration period value of 0.779 seconds in the X direction and has the largest dynamic shear force value in the X direction, which is 4823.74 kN. Therefore, it can be concluded that there is an effect of the placement of supports in steel frame multi-story buildings on the ability of the building structure with the even placement model (BC3) to produce the most optimal building design when compared to other building models.
Spatial Distribution Analysis of Geotechnical Properties (Elastic Modulus, Cohesion, and Internal Friction Angle) in Soil Layers of Bengkulu City Hanipa, Rerisa Al; Kamal, Thomas Mustafa; Fikri, Muhammad Haikal; Mase, Lindung Zalbuin; Misliniyati, Rena; Supriani, Fepy; Refrizon, Refrizon
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol. 21 No. 1 (2025): May
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v21i1.78611

Abstract

This study investigates the spatial distribution of key geotechnical parameters—namely modulus of elasticity, cohesion, and internal friction angle—in the dominant soil types of Bengkulu City, Indonesia. Given the region’s complex geological structure and vulnerability to seismic activity, accurate assessment of soil characteristics is essential to support infrastructure development and mitigate geotechnical risks. Bengkulu lies between two active tectonic faults, making soil behavior analysis a crucial component of earthquake-resistant design. A total of 215 geotechnical data points were compiled from previous field investigations, covering a wide range of lithologies, including sandy soils, clay deposits, and various rock layers. The geotechnical parameters were spatially interpolated using the Inverse Distance Weighting (IDW) method to generate distribution maps that visualize the variation across different soil layers. This method was selected for its simplicity, effectiveness, and ability to provide weighted estimates based on spatial proximity. The analysis reveals that soils in the southern coastal region generally exhibit lower values of modulus of elasticity and cohesion, indicating a higher potential for deformation and shear failure. In contrast, central and northern areas tend to show higher geotechnical strength parameters, suggesting relatively stable ground conditions. The internal friction angle also increases with depth and material density, with hard rock zones showing the highest values. These findings contribute to the understanding of soil behavior in Bengkulu City and offer valuable insights for geotechnical engineers, urban planners, and disaster mitigation authorities. The spatial analysis of soil strength parameters provides a foundation for more resilient infrastructure planning and can be used as a reference for similar studies in other high-risk seismic regions.
Descriptive Study of Infiltration Well Design and Utilization in Sleman Regency, Special Region of Yogyakarta Hartadi, Arhad; Supraba, Intan; Kamulyan, Budi
INERSIA lnformasi dan Ekspose Hasil Riset Teknik Sipil dan Arsitektur Vol. 21 No. 1 (2025): May
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/inersia.v21i1.80157

Abstract

In Indonesia, household-scale infiltration wells serve dual functions: managing rainwater and acting as secondary treatment systems for domestic wastewater from septic tanks. These roles require distinct designs, particularly in the arrangement and thickness of filter media. According to Indonesian technical standards (SNI – Standar Nasional Indonesia), wells designed for septic tanks use thicker, multi-layered filters that occupy most of the well's volume, while rainwater wells typically feature only a thin filter at the base. This difference reflects the higher pollutant levels in septic tank effluent compared to rainwater. Direct interviews with housing contractors in Sleman Regency, involving 836 household samples, revealed that all households repurposed rainwater infiltration well designs for managing domestic wastewater. Such practices deviate from intended design standards, raising concerns about the effectiveness of the filtration systems in these wells for contaminant removal and their potential contribution to groundwater pollution. The study further examined correlations between population density, soil characteristics, and the design and usage patterns of infiltration wells. In densely populated areas, more complex systems are often employed to manage wastewater and rainwater efficiently in limited spaces. In contrast, simpler systems are more common in less populated areas. Additionally, regions with clay-rich soils require larger wells to accommodate slower infiltration rates, while areas with sandy soils need smaller wells due to higher infiltration rates. These findings emphasize the importance of aligning infiltration well designs with both their intended purposes and local environmental conditions. Properly designed systems that manage wastewater and rainwater separately can reduce the risk of groundwater contamination, promoting more sustainable water management practices.

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