Jurnal Karajata Engineering

Kajian Level Kinerja Struktur Apartemen 25 Lantai terhadap Beban Gempa dengan Analisis Pushover pada Sumbu Kuat

Gita Zakiah Putri — 2025-07-31

High-rise projects like 25-storey apartment buildings often face construction challenges due to dense reinforcement, particularly in shear walls. Spatial constraints may prevent full rebar installation, as seen in a studied project in Jakarta, leading to minor reinforcement reductions. Although seemingly insignificant, such reductions can affect ductility and seismic performance. The site lies in Seismic Design Category D per SNI 1726:2019, requiring special seismic detailing and ensuring structures meet at least Damage Control (DC) performance under Maximum Considered Earthquake (MCE) conditions (2% probability in 50 years). The building uses a dual system—moment-resisting frames and shear walls—with a ductility factor of R=7R = 7R=7, following ATC-40 guidelines. Pushover analysis showed a maximum base shear of 3063.76 kN at 1298.59 mm roof displacement (step 18), while the performance point was reached at 619.45 mm displacement and 2250.89 kN base shear. Plastic hinges formed first in beams at step 7 and progressed until step 18. The building satisfies the DC performance level, indicating it can endure MCE-level earthquakes with low life-safety risk. Estimated repair costs at this level are around 35% of the structural value, confirming acceptable structural performance and safety for occupancy during major seismic events.

Evaluasi Ketersediaan Air Baku Di Kecamatan Anggeraja : Studi Kasus PDAM Tirta Massenrempulu, Kabupaten Enrekang

Farida Gaffar — 2025-07-31

PDAM Tirta Massenrempulu is the main provider of piped clean water by utilizing river and spring water as its main water source. Anggeraja sub-district experiences an increase in population every year so that the demand for raw water also increases. Therefore, discharge data is essential for managing the available water resources. The purpose of this study is to analyze the availability and demand of raw water in Anggeraja Sub-district using the FJ Mock method. Based on the results, it was found that the availability of raw water can meet the needs of the population in Anggeraja District. For instance, the projected water availability in 2034 is 74.46 m³/second. Meanwhile, the comparison between water availability and demand over the next 20 years shows a continuous increase in demand. In 2024, the available raw water is 36.65 m³/second, and by 2034, the demand rises to 66.46 m³/second. Thus, the water balance indicates a surplus, with an excess of 37.90 m³/second in 2024 and 7.90 m³/second in 2043.

Penggunaan Software HEC-RAS Pada Pemodelan Angkutan Sedimen Dasar di Saluran Primer D.I. Maloso

Abdi Manaf — 2025-07-31

Despite being equipped with mud pockets, the Sekka-sekka Dam still requires routine maintenance due to sediment accumulation in the Primary Canal. Sediment modelling has become an effective approach to identify areas with high sedimentation to make maintenance more focused and efficient. This research aims to determine the sedimentation patterns that occur, model the transport of bed sediment, and analyse the magnitude of bed sediment transport in the D.I Maloso primary canal using Hec-Ras software. The analysis was conducted using a Quasy-Unsteady Flow approach, with input comprising cross-sectional data of the canal, a flow discharge of 33.81 m³/s, and the characteristics of the bed sediment. The simulation results indicate the presence of sediment transport along the canal, with a dominance of fine sand and medium sand fractions. The total sediment transport over one month in the upstream reached 14,551 kg/month with a sediment thickness of 0.00227 m, in the midstream 35,351 kg/month (0.00551 m), and downstream 23,791 kg/month (0.00371 m). The shear stress values were 0.0080 Pa, 0.0078 Pa, and 0.0076 Pa respectively, with a fall velocity of 0.26 m/s upstream, and 0.2 m/s in the midstream and downstream. The average sediment concentration over three months was 0.3 mg/l, with the highest concentration recorded downstream at 4.8 mg/l. This modelling demonstrates the distribution of transported sediment in the canal, with the highest accumulation downstream due to the decrease in flow velocity and shear stress.

Tingkat Pemahaman Keselamatan Dan Kesehatan Kerja Pada Pembangunan Gedung MAN 2 Banggai Standar ISO 45001

Syamsu Basiri — 2025-07-31

Occupational Safety and Health is crucial in construction to protect workers and prevent accidents. However, in projects such as the MAN 2 Banggai Building, OHS implementation, particularly in first aid and near miss incidents, remains inadequate. The increasing number of occupational fatalities in Central Sulawesi highlights the urgent need to improve the OHS evaluation system in the field. To address this challenge, this study uses the Countenance Stake Model linked to the ISO 45001 standard. The purpose of this study was to evaluate the extent of workers' understanding of OHS principles, assess strengths and weaknesses in their implementation, and provide data-based recommendations for improvement. The evaluation results indicate that although workers are quite strong in risk identification, there are weaknesses in OHS policies and worker technical competencies. While resources and communication are adequate, aspects of documentation, internal audits, and management reviews still need to be improved. Organizations should raise worker awareness through regular evaluations and targeted training.

Analisis Keseimbangan Air pada Daerah Irigasi Matajang Kab. Barru

Sri Nirwana Sari — 2025-07-31

Water resources are critical to supporting agriculture, particularly irrigation systems. The Matajang Irrigation Area in Barru Regency, South Sulawesi, is facing issues due to uneven water distribution, climate change, and rising irrigation water demand. The purpose of this study is to evaluate the effectiveness of the present irrigation system and the availability of a consistent discharge to meet the area's irrigation water needs. This study applies a quantitative analytic method, collecting primary data via field surveys and secondary data from relevant institutions, such as rainfall and irrigation land area. Data analysis is conducted using Microsoft Excel to process hydrological data and evaluate water balance. The research results indicate that the water balance in the Matajang irrigation area shows adequate water availability for agriculture, especially during the rainy season, with a dependable flow of Q80 averaging 12.09 l/s (October-March) and 3.34 l/s (April-September).

Perencanaan Sistem Jaringan Distribusi Air Bersih di Desa Jonjo Kecamatan Parigi

Ade Fajar Sidiq — 2025-07-31

Parigi Sub-district in Jonjo Village, Gowa Regency, faces challenges in the availability of clean water, just like other areas. Local communities often experience difficulties in accessing safe and quality clean water. Geographical conditions are the main obstacle in the distribution of clean water in this area. Therefore, careful planning of the clean water distribution network system is needed to meet the needs of residents and overcome the existing obstacles. This study aims to calculate the clean water needs of the Jonjo Village community, Parigi Subdistrict in 2040, and design a clean water distribution network system using EPANET 2.0 software. The results showed that the average demand for clean water in 2040 was estimated to reach 5,780 liters per second, with peak hour demand reaching 9,017 liters per second. Based on the analysis with EPANET 2.0, a network scheme was designed that includes 1 reservoir unit, 23,093 meters of pipelines with various diameters which are 114 mm, 89 mm, and 60 mm, and is equipped with 1 pressure release basin.

Validasi Eksperimental dan Teoritis Daya Dukung Tiang PVC dengan Metode Mazurkiewicz dan Mayerhof

Susy Srihandayani — 2025-07-31

Development in areas with soft soil conditions, such as Dumai, faces technical challenges related to low carrying capacity and high land subsidence. Lightweight and economical foundation solutions are an urgent need, especially for small and medium-scale structures. This study aims to validate the axial bearing capacity of PVC poles in soft clay soils using two approaches: the experimental interpretation of the Mazurkiewicz method and the theoretical approach of the Meyerhof method. Laboratory tests were performed on four variations of PVC pipe diameters (2", 2.5", 3", and 4") planted vertically in saturated soft soil. The load-drop data were analysed using the Mazurkiewicz method, while the theoretical calculation of the bearing capacity was based on the soil parameters of the direct shear test and the Atterberg limit. The results showed that the ultimate capacity value of the Mazurkiewicz method was slightly higher than that of the Meyerhof method, with a difference of 0.11% to 3.53%. This difference is due to the contribution of buoyancy forces from the trapped air in the closed pipe and the increased lateral friction due to the flexibility of the PVC material. This study confirms the potential of PVC poles as a lightweight and economical foundation solution in soft soils, as well as the relevance of the Mazurkiewicz method as a complement to the classical method.

Pemetaan Zona Rawan Banjir Berbasis Skoring dan Pembobotan di Kecamatan Balusu, Kabupaten Barru

M. Agussalim — 2025-07-31

Balusu District is one of the areas in Barru Regency that has geographical characteristics that are prone to flooding. Topographically, this district has lowlands that tend to be prone to flooding during the rainy season. The purpose of this study was to determine the most dominant factors that causing flooding and to map the area of flood-prone areas in Balusu District, Barru Regency. The method used in this study was to use the scoring and weighting method. The parameters of this study namely rainfall, land height, slope, soil type and land use will later be assessed by giving weights and classification values to each and then processed using the ArcGIS software. The results obtained from this study are the most dominant factors and causes of flood vulnerability in Balusu District are land elevation and high rainfall and the distribution of flood-prone areas in Balusu District is 42.68% of the total area of Balusu District, which is 104.82 km².

Perbandingan Efisiensi Waktu dan Tenaga Kerja Menggunakan Metode Time Trade Off

Lasty Dinulfy Risfawany K. S. — 2025-07-31

In project implementation, there are three main aspects that need to be considered, namely adherence to schedule, expense management, and quality. The Time Cost Trade Off (TCTO) technique is one approach used to evaluate the relationship between time and expenses in construction projects. This study aims to evaluate the time and expense estimates of the project both before and after work hour extensions, as well as to analyse the time and expense estimates of the project before and after total workforce expansion. The data used in this study were obtained through direct observation involving stakeholders in the project to ensure the accuracy and relevance of the data, and will be analysed by applying the Time Cost Trade Off technique. The analysis results indicate that increasing the total workforce is more economical and efficient compared to extending work hours.

Identifikasi Sebaran Intrusi Air Laut Melalui Profil Kualitas Air Sumur Di Pantai Barombong

Nurnawaty — 2025-07-31

Rapid development in Makassar City increases the demand for housing, clean water and industry, which encourages massive exploitation of groundwater. If this continues, it could degrade groundwater quality and quantity and trigger seawater intrusion, threatening groundwater availability in the region. The aim of this research is to analyze and identify measurements and values of salinity due to sea water on ground water quality at Barombong Beach. In this research, a research l ocation survey was carried out, sampling stage, sample testing stage, data processing stage, community interview stage. The well water at Barombong Beach has a salinity that is still categorized as fresh to brackish. Well water that has a salinity of <0.5% then the water is categorized as fresh, >0.5-30%, then the water is categorized as brackish and if the water salinity is >40% then the water is detected as salty. From the results of this research calculation, the highest salinity is found in well 15, namely 5% at a distance of 858.76 from the shoreline and the lowest is located at wells 1 and 2, namely 0.2% which is located at a distance of 165.98 m and 201.06 m from the shoreline.