OJS Universitas Tadulako
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Perbandingan Biaya dan Waktu Erection PCI Girder dengan Crawler Crane dan Gantry Launcher (Studi Kasus: Jembatan Soran Proyek Jalan Tol Solo – Yogyakarta – Nyia Kulon Progo Seksi 1 Paket 1.2)
Full text linkThe infrastructure growth in Indonesia, particularly on the island of Java, has surged significantly up to the year 2024, one of which includes the Trans-Java toll road project. The aim of this development is to boost the country's economic growth and streamline transportation. A part of the Trans-Java toll road project that is still under construction is the Solo – Yogyakarta – NYIA Kulon Progo Toll Road Project, which connects the cities of Surakarta and Yogyakarta. The construction of the Solo – Yogyakarta – NYIA Kulon Progo Toll Road in Section 1 Package 1.2 is planned to traverse several terrains. For instance, at STA 22 + 767, it will cross the Soran River. Therefore, a bridge needs to be built at STA 22 + 767. The planning of the PCI girder erection method needs to be reviewed, especially for the Soran Bridge, as the initial plan to use the gantry launcher method requires further assessment in terms of time and implementation costs. Hence, an alternative method, the crawler crane, is needed for comparison. From the analysis of time and cost comparisons between the two methods, namely the Crawler Crane method and the Gantry Launcher method for the erection of the PCI girder at the Soran Bridge, the analysis results are as follows: The productivity of equipment using the Crawler Crane method is 0.75 units/hour, and for the Gantry Launcher method, it is 0.19 units/hour, making the productivity faster with the Crawler Crane method. In terms of implementation time based on the analysis, it is 9 days for the Crawler Crane method and 20 days for the Gantry Launcher method, making the implementation 55 percent faster using the Crawler Crane method. Regarding the implementation cost of each method based on the cost analysis, including the procurement and installation of PCI girders, it is IDR 9,219,795,750.00 for the Crawler Crane method and IDR 9,967,224,600.00 for the Gantry Launcher method, making the Crawler Crane method more cost-efficient by 7.49 percent
Analisis Struktur Hotel Menggunakan Metode Direct Displacement Based Design
Full text linkPalu City is one of the areas prone to earthquakes, as evidenced by the earthquake incident on September 28 2018, buildings in Palu city should be analyzed due to seismic loads and based on structural performance. One of the performance-based analysis methods is the direct displacement based design (DDBD) method. The direct displacement based design method is an seismic analysis method that makes the performance target as an initial reference for seismic load design. The design structure in this paper is a 12-storey hotel structure and located in Palu City, using a special moment resisting frame system, with the quality of the concrete material, f'c = 35 MPa, reinforcement fy = 420 MPa for main reinforcement and 280 MPa for shear reinforcement. The seismic load generated from the DDBD for the X direction is 6986.61 kN and for the Y direction is 6132.91 kN. From the loads acting on the structure, it is found that the safe dimensions of the elements are using column dimensions 800/800, main beam 700/500, and the plate thickness is 140 mm
Prediksi Kerawanan Banjir di Daerah Aliran Sungai Olaya Kabupaten Parigi Moutong
Full text linkThis study aims to determine the distribution of flood vulnerability levels in the Olaya Watershed located in Parigi Moutong Regency, using two previous research methods, namely the Hamdani et al. method, and the Latue & Latue method, which were then validated in the field to determine the level of validity of the two methods. The method used is data collection such as rainfall data, flood incident data, Olaya Watershed maps, DEMNAS maps, soil type maps and spot 6 satellite image maps. The analysis carried out in this study includes classifying and scoring the classification of rainfall parameters, slope gradient, land use, soil type, river buffer, elevation and Overlay is carried out by combining all input flood vulnerability parameters that have been mapped, to obtain flood vulnerability values and flood vulnerability level maps. The results of this study are the results of the analysis of flood vulnerability levels using the Hamdani et al. method, divided into Most Safe, Threatened, Vulnerable and Most Vulnerable while the Latue & Latue method is divided into Low, Medium and High. The results of these two methods are not yet in accordance with the flood events in the Olaya Watershed, this is because the weight of each parameter is not yet appropriate, there are still parameters that have not been included in the flood vulnerability modeling, the scoring of the parameter classification is not yet appropriate and the classification and scoring of the parameters are differen
Analisis Transpor Sedimen Dasar Sungai Alopohu yang Bermuara di Danau Limboto
Full text linkOne of the causes of flooding in Gorontalo is the reduced capacity of Lake Limboto, which has served as a natural water reservoir and flood preventer, to perform these functions effectively due to siltation. This diminished capacity is attributable to the deposition of sedimentary material carried by the rivers that drain into Lake Limboto. A total of 23 rivers discharge into Lake Limboto, contributing sedimentation on an annual basis. Among these, the Alopohu River is one of the most significant contributors. The objective of this study was to quantify the sediment transport generated by the Alopohu River. The analysis was conducted through the collection of direct measurement observation data in the downstream region of the Alopohu River, with the objective of obtaining data on river geometry, flow velocity, instantaneous discharge, and bottom sediment samples. Laboratory tests were conducted on basic sediment samples in order to ascertain the characteristics of the sediment grains. The data were subsequently analyzed using empirical formulas, namely the Meyer-Peter and Muller, Einstein, and Frijlink formulas. The quantity of bed sediment transport (bed load) in the downstream Alopohu River, as determined by discharge measurements and the application of the Meyer-Peter and Muller formula, is 2.86 tons per year. The Einstein formula yields a value of 621 tons per year, while the Frijlink formula produces a result of 54.67 tons per year. The discrepancy in the calculated values for each empirical formula is attributed to the specific parameters utilized in each formul
Analisis Penggunaan Lengkung Durasi Aliran (Flow Duration Curve) Untuk Mengetahui Debit Andalan di Sungai Sidoan Kabupaten Parigi Moutong
Full text linkLimited hydrological information in the form of discharge data on a river or watershed can hinder the process of developing water resources in the area. Based on discharge data recorded at the Sidoan Weir, site in Parigi Moutong Regency, the river has the potential to be used for various purposes, such as irrigation, micro-hydro power plants, raw water, and thus. This study aims to determine the similarity between measured discharge data and calculated discharge data on the Sidoan River, as well as to determine the reliable discharge on the Sidoan River. The data used in this study are climatological data, rainfall data, and discharge data (2011-2020), including a map of the Sidoan watershed. Evapotranspiration analysis was performed using the Modified Penman Method. Measured discharge data was used to determine the similarity with calculated discharge, which was analyzed using the F.J. Mock Method. The Flow Duration Curve (FDC) method was used to analyze the amount of reliable discharge. The results of the study show that the average evapotranspiration value ranges from 100 to 150 mm/month. The parameters used in the water availability analysis with the F.J. Mock method were watershed parameters optimized with a correlation coefficient between measured and calculated discharge of 0.78. The results of the study show that the RMSE values before and after optimization of the watershed parameters are 4.16 and 2.76, respectively. The calculation validation was performed using Mean Absolute Error (MAE). The FDC results show that the 80% - 90% reliable discharge is 0.251 m3/second - 0.150 m3/second, while the 50% reliable discharge is 0.860 m3/second. These results can provide an overview of water availability that can be used for water resource development and managemen
Analisis Potensi Likuefaksi Dengan Alat Swedish Weight Sounding di Desa Tompe Kecamatan Sirenja Kabupaten Donggala
Full text linkIn 2018 in Indonesia there has been an earthquake of 7.4 on the richter scale. The epicenter was on land around Sirenja district, Donggala regency, Central Sulawesi. The impact in some areas there is liquefaction of these areas, namely Petobo village and Balaroa village and also subsidence in Tompe Village this study aims to determine whether the soil in segment II of Tompe village has the potential for liquefaction based on the results of Cyclic Stress Ratio (CSR) & Cyclic Resistance Ratio (CRR) analysis and based on the results of Tsuchida grain distribution graph. Samples in this study amounted to 10 points by field testing using Swedish weight sounding tool to obtain the value of Nsw (n/m) correlated to the N-SPT data and analyzed by the CSR & CRR equation to obtain the value of the safety factor (FS). The results obtained with the range of FS values are for the potential 0.13 – 0.98 and not potential 1.06 – 1.72 and based on the results of grading the grain to get the value for the potential 70.31% - 95.87% and not the potential 0.39% - 6.62% from the results of the 2 methods it is concluded that Tompe village based on the value of FS 50% has the potential for liquefaction and based on the Tsuchida graph 85.78% has the potential for liquefaction
Analisis Debit Air Limpasan Permukaan Akibar Perubahan Tata Guna Lahan Pada Daerah Aliran Sungai Bangga
Full text linkSurface runoff is rainwater that cannot be retained by soil, vegetation or basins and eventually flows directly into rivers or the sea. The amount of surface runoff determines the amount of damage caused by erosion and flooding. The amount of surface flow is influenced by rainfall, vegetation (land cover), the presence of water storage buildings and other factors. Damage to watersheds can cause various disasters, namely floods, droughts and landslides. The Bangga watershed has an area of 61,0561 km2 and has a river length of 20.7 km. Das Bangga has also experienced flash floods and mudflows in 2019 which caused 500 houses to be flooded and residents died after being washed away by the flood. The purpose of the study was to calculate runoff in the Bangga River watershed using the SCS-CN method. In this study the data used is secondary data, namely Rainfall data taken from the Upper Bangga and Lower Bangga stations and Land Use Maps and Soil Type Maps. The period of secondary data used in 2018-2021. Land use and soil types are analyzed from land use maps and soil type data obtained. Map analysis was carried out using ArcGIS Software by making an overlay between the land cover map and the soil type map. The second result of this analysis is the area of each type of land use and soil type hydrology group and its distribution in the Bangga watershed. Based on the results of the analysis, the runoff using the SCS method obtained the maximum result in 2019 of 29,222 mm with a runoff volume of 1.784.155,751 m3, and the minimum runoff in 2018 of 0,072 mm with a runoff volume of 4.375,573085 m3. The occurrence of Land Use changes, climate change and human treatment of the environment can affect runoff
Analisis Durabilitas dan Penuaan Asbuton Pracampur dengan Variasi Lama Rendaman
Full text linkEconomic growth. Most of the existing road surface layers in Indonesia use Flexible Pavement. The fundamental problem in road construction is road damage before the planned age is reached, the factors that cause road damage can be caused by the influence of weather and water, causing asphalt aging and durability of road pavement to be damaged. The purpose of this study was to determine the Durability and Aging of Pracampur Asphalt Buton (ASBUTON) with Variations in Soaking Time by conducting experiments conducted in the laboratory through Marshall Test testing with reference to the general specifications of bina marga 2018. Short - Tern Aging (STOA) test specimens were made by heating the specimens in a loose state at 135oC for 4 hours before compaction, while Long- Tern Oven Aging (LTOA) test specimens were made by heating the specimens for 2 days at 85oC after the specimens were compacted. Durability parameters of AC-WC mixtures were observed from the residual strength index (IKS), first durability index (IDP) and second durability index (IDK). Based on the premixed asbestos mixture in the AC-WC layer, the optimum asphalt content (KAO) of 6.25% was obtained. The IKS of Normal, STOA, and LTOA specimens were 98.97%, 98.21%, and 97.69%, respectively. Furthermore, the IDP of Normal, STOA and LTOA specimens obtained r values of 0.7%, 0.11%, and 0.15%, respectively. While the IDK of Normal, STOA and LTOA test specimens obtained values of 1.53%, 2.64% and 3.41%, respectively, while the SA value of Normal, STOA and LTOA test specimens at 48 hours immersion is 98.47%, 97.36%, and 96.59%, respectively. After 48 hours of immersion at 60oC, it tends to decrease or lose strength for all test specimens and conditions. The STOA test specimen at 48 hours of immersion experienced a significant decrease of 89.83% so that it did not meet the specifications specified in the 2018 Bina Marga Specification of 90%
Studi Pengaruh Penambahan Abu Batu Sebagai Pengganti Pasir Pada Beton Mutu K-250
Full text linkThe handling of stone ash waste from the by-product of the Quarry C crushed stone factory with the number of factories along the Palu-Donggala road has not been handled properly until now. The potential for utilization for building materials such as lightweight concrete, paving blocks and rosters as well as fillers for asphalt concrete mixtures and rigid pavements at airports is still large to be developed. Based on this, stone ash waste can be used as a building material to build structures and infrastructure. However, the characteristics of the basic materials and building materials made from stone ash waste must be re-tested. The analysis was carried out on the results of the concrete compressive strength test (SNI 03-1974-2011), which is a comparative analysis of various conditions of the age of the test object and the percentage of stone ash addition to the weight of fine aggregate obtained from the laboratory. The addition of stone ash as a partial replacement for fine aggregate can increase the compressive strength of concrete by up to 9.64% compared to the compressive strength of normal concrete. The optimum level of stone ash addition as a partial replacement for fine aggregate occurs at a variation of 20% stone ash from the weight of fine aggregate. The compressive strength of 28-day concrete that occurs in this variation is 23.590 MPa, while the compressive strength of concrete without the addition of stone ash is 21.515 MPa. The compressive strength value of concrete with 50% rock ash content has the lowest compressive strength value of 21.137 MPa, where there is a decrease in the compressive strength value of 1.75% compared to the compressive strength value of concrete without the addition of stone ash.
Pengaruh Penambahan Dinding Geser Terhadap Perilaku Struktur pada Gedung Bertingkat 10 Lantai di Kota Malang
Full text linkBuilding planning with earthquake-resistant structures is carried out to reduce the risk of loss and loss of life during earthquakes, especially in areas with high earthquake risk. This planning aims to evaluate the effect of adding shear walls on the structural behavior of a 10-story building in Malang City. Shear walls are generally used to increase structural stiffness and strengthen the structural system in resisting earthquake forces. With the addition of shear walls, better control of inter-story deviations where the value is significantly reduced compared to being designed as a single system. Shear walls or moment-resisting frames must be able to withstand at least 25% of the design earthquake force. Structural analysis is carried out with the ETABS 19 civil engineering assistance program using building technical data, material data, and building design drawings. The analysis includes determining dimensions based on SNI 2847: 2019 and loading and structural control based on SNI 1726: 2019. The results of the structural analysis show that with the addition of shear walls, the structural elements used are more effective and do not reduce the structure's ability to withstand earthquake loads or gravity loads. The planned shear wall has been able to accept more than 50% of the existing earthquake force, this result has met the minimum requirements for the load carried by the shear wall. The resulting drift also does not exceed the permissible drift, although there is a fairly large difference in the drift value. However, the determination of the location of the shear wall must still be adjusted to the needs and adjust the design of the planned buildin