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Kajian Hidrologi untuk Mitigasi Longsor di Kawasan Jalan Sisi Lumajang (Sta.58+830 sd 59+930)
Full text linkWatershed (DAS) of a tributary have caused landslides along the access road to the Besuk Koboan road and bridge construction project in Sumberwuluh Village, Candipuro District, Lumajang Regency. The watershed area examined in this study was located on the slope at STA 58+670, and is analyzed to assess surface runoff entering the main road due to the lack of natural reinforcement from vegetation as a result of land use conditions. Identification results indicate that the landslide was caused by erosion (scouring) at the base and foot of the slope; the riverbanks are composed of porous and easily eroded lava deposits from Mount Semeru, as well as water seepage from the cliff. The proposed landslide mitigation con+cept for the river slope includes: Slope reinforcement using piles, Design of a drainage system to manage surface water runoff, Protection of the slope foot from scouring using gabion structures (gabion lay dams) or riprap, Slope crest arrangement to reduce water infiltration, Box culvert cross-section design that takes into account the landslide condition on the slope. Furthermore, regarding the landslide condition affecting the National Road segment Malang–Lumajang at STA 58+830 to 58+930, which was impacted by inadequate existing drainage infrastructure, it is crucial to reconstruct the drainage system based on the analysis and study that has been conducte
Faktor Kualifikasi Kontraktor yang Mempengaruhi Kinerja Proyek Konstruksi Berdasarkan Persepsi Konsultan
Full text linkThe development of quality infrastructure in Sigi Regency plays a vital role in supporting economic growth and community welfare, particularly in the aftermath of the 2018 earthquake. The success of this development is significantly influenced by contractor qualifications, which encompass technical aspects, experience, and available resources. This study aims to identify the dominant contractor qualification factors influencing construction project performance and to analyze the relationships among these factors based on the perceptions of consultants in Sigi Regency. This study employed a quantitative approach, distributing questionnaires to 37 consultants selected through purposive sampling. Data from 24 variables were analyzed using descriptive statistics, the Relative Rank Index (RRI), and Spearman's Rho correlation. The RRI analysis identified five dominant factors: financial obstacles during project implementation (RRI = 0.874), labor experience (RRI = 0.869), the educational background of the person-in-charge (RRI = 0.847), compliance with technical specifications (RRI = 0.815), and the educational background of implementers and supervisors (RRI = 0.811). The Spearman correlation analysis revealed a strong relationship between the educational backgrounds of implementers and the person-in-charge (r = 0.668). However, the financial obstacles factor showed a very weak correlation with the other four variables. This study underscores that human resource competency and financial readiness are critical factors for enhancing construction project performance in Sigi Regency
Pengaruh Pencampuran Serat Serabut Kelapa Pada Tanah Lempung Terhadap Nilai CBR dan Kuat Geser
Full text linkThis research aims to investigate the influence of coconut fiber incorporation on clay soil in terms of its California Bearing Ratio (CBR) and shear strength. The study involved collecting clay samples from a specific location and blending them with varying percentages of coconut fibers. Laboratory experiments were carried out to assess the CBR and shear strength of both untreated clay and clay mixed with different fiber fractions. The laboratory results revealed an improvement in CBR from the original clay value of 5.59% to 6.1% with 0.2% fiber addition, 6.64% with 0.4%, and 7.34% with 0.6%. These results indicate a consistent increase without any decline. Additionally, the shear strength test showed a 0.2% improvement, with the optimal shear strength achieved at a 0.2% fiber composition, reaching 1.0588%. The inclusion of coconut fibers significantly enhanced the CBR of the clay. The study also identified the optimal fiber fraction required to maximize CBR improvement. Moreover, the addition of coconut fibers boosted the shear strength, making this method useful for civil engineering projects such as road stabilization, foundation reinforcement, and other construction activities in areas with clay soil. This study highlights the potential of coconut fibers as a cost-effective and sustainable reinforcement material for clay soil in civil construction, offering both economic and environmental benefits to the construction industr
Perencanaan Struktur Atas Bangunan Gedung Menggunakan Sistem Rangka Bresing
Full text linkAfter the 2018 earthquake, a number of constructions in Palu City, especially buildings, grew rapidly. In the construction of buildings using steel structures, the use of braces aims to reduce displacement and increase the capacity of shear forces to resist cracking. Steel produces greater ductility when compared to other structural materials, so it is a major requirement in designing earthquake-resistant steel structures. In this study, the structure of the building was designed to be 3 (three) stories in educational purpose. The structural system has a dual system combination Special Moment Resisting Steel Frame System (SMRF) and a lateral force resisting system, namely a Special Concentric Brace Frame System (SCBF). Steel material used are BJ 41 quality (fy = 250 MPa; fu = 410 MPa) and concrete using quality f'c = 25 MPa. The loads acting on the structure are dead load, live load, wind load, rain load, and earthquake load. The results of the structural analysis are: 99,42% mass participation is obtained for the x direction in mode 4 and 98,97% for the y direction in mode 5, the SRSS method was used to combine the number of mode varieties used, the obtained dynamic earthquake shear force response spectrum (x direction = 281993,31 kg and y direction = 280187,36 kg) has exceeded the equivalent static earthquake shear force (x direction and y direction = 280096,09 kg), the displacement that occurs in the x direction and y direction does not exceed the allowable displacement of 34,615 mm, the stability coefficient obtained in the x-direction and y-direction does not exceed the P-Delta effect limit of 0,1 and the structural stability limit of 0,0909, the structure does not occur horizontal irregularities and vertical irregularities, the Special Moment Resisting Steel Frame System (SMRF) has exceeded the percentage of 25% (x direction = 62,49% and y direction = 58,26%), the structural performance level in the x direction and y direction is in Damage Control condition
Model Bangkitan Perjalanan Penduduk Hunian Tetap (Studi Kasus Hunian Tetap Tondo)
Full text linkThe Tondo permanent residence is located in Tondo sub-district, Mantikulore sub-district, Palu city. This residence will have a traffic impact on the surrounding road network because the impact of development in the area where the residence is built will still be an increase in population, increase in income, increase in vehicle ownership and the construction of a number of public facilities which will generate traffic generation and attraction so that It is necessary to conduct research on socio-economic characteristics, movement characteristics and generation models. Data collection was carried out using primary data through a home interview survey. To produce a trip generation model in this study, multiple linear regression methods were used. The socio-economic characteristics of Tondo permanent residences are 37.66% of family members amounting to 3 people, 39.29% total income of Rp. 1,000,000 – Rp. 3,000,000, the number of 2-wheeled vehicle owners is 40.58% who owns 2 units, the number of 4-wheeled vehicle owners is 88.64% and does not own a car and the travel intensity is 41.23%, amounting to 5 trips, while the characteristics of population movement in Tondo permanent residences namely the address before the earthquake 45.13% came from West Palu District, the type of work 49.03% worked as self-employed, the purpose of the trip 62.66% was to work, the education level of 79.22% was high school and the destination of the trip was 24.03% Head to Mantikulore District. The trip generation model is Y = 2.8642 + 0.9452 X
Pengaruh Menghilangkan Dinding Geser Terhadap Perilaku Stuktur Gedung 11 Lantai dengan Denah L-Shaped
Full text linkMalang Regency is an area prone to tectonic earthquakes, so the planning of multi-story buildings, especially those with an asymmetric L-shaped plan, needs to consider the optimization of earthquake-resistant structures. Shear walls are commonly used to increase structural stiffness, but they can introduce complexities in planning and construction. This study aims to evaluate the effect of removing shear walls on the structural behavior of the Samaview Residence Building, an 11-story building with an L-shaped plan in Malang Regency. Structural analysis was carried out with the help of the ETABS 18 program using building technical data, material data, and building design drawings obtained from the implementer and literature studies. The analysis includes determining the dimensions of structural elements based on SNI 2847:2019, calculating gravity and earthquake loads according to SNI 1727:2020 and SNI 1726:2019, as well as evaluating inter-story drift, structural irregularities, and P-Delta effects. The analysis results show that the removal of the shear wall still results in structural element dimensions that meet the requirements of SNI 2847:2019. Structural drift and P-Delta effects also meet the requirements of SNI 1726:2019, although there are inside corner irregularities that need to be considered in the design. It can be concluded that removing the shear walls in the Samaview Residence Building does not affect the ability of the structure to withstand gravity and earthquake loads. However, special attention needs to be paid to the inner corner irregularities, drift, and P-Delta effects to ensure the effectiveness of the earthquake-resistant structural syste
Effect of Activator Composition on the Setting Time and Compressive Srength Of Fly Ash–Lime-Based Geopolymer Paste
Full text linkThis study aims to investigate the optimal composition of geopolymer paste based on fly ash and lime to achieve ambient temperature hardening, ideal setting time, and high compressive strength. The primary materials used include Class F fly ash from the Mpanau coal-fired power plant and hydrated lime (calcium hydroxide) at 5% of the fly ash weight. The activators employed were Sodium Silicate (Na2SiO3) and Sodium Hydroxide (NaOH), with Na2O dosage variations of 7.5%, 10%, and 12.5%, and activator modulus (SiO2/Na2O ratio) variations of 0.75, 1.00, and 1.25. The specimens were cylindrical with a diameter of 25 mm and a height of 50 mm, and compressive strength tests were conducted at 3, 7, 14, and 28 days. The results showed that the optimum setting time was achieved at a Na2O dosage of 7.5% with an activator modulus of 0.75 and 1.00, yielding setting times of 88.67 and 60.94 minutes, respectively. The highest compressive strength was recorded at a Na2O dosage of 10% with an activator modulus of 1.25, reaching 29.76 MPa at 28 days. These findings suggest that the composition of the alkaline activator significantly influences the early-age properties and mechanical performance of fly ash–lime-based geopolymer past
Analisis Penjadwalan Waktu Pekerjaan Pada Proyek Jalan Kawasan Ekonomi Khusus (KEK) Pantoloan Menggunakan Linear Scheduling Method (LSM)
Full text linkA construction project is a temporary activity with a specific end goal. One of the crucial things in the construction process is work scheduling, this is because it can affect the duration and cost of the project. In the context of scheduling, methods such as Block Charts, S-Curves, Network Diagrams, and Balance Line Diagrams/Linear Scheduling Method (LSM) has been around for a long time, but in its application the scheduling method should be adjusted to the characteristics of the project to avoid losses in development. The LSM method is considered appropriate for work that is repetitive in nature. This research aims at analyzing time scheduling for road projects in the Pantoloan Special Economic Area (SEA), Central Sulawesi, using Linear Scheduling Method (LSM). The purpose of this research is to determine the comparison of scheduling and budget plans between the LSM and project methods existing. Data collection consisting of primary data and secondary data was obtained by direct observation in the field and interviews with related parties. Then a scheduling analysis is carried out with assistance software. From the research results on the scheduling of the Pantoloan KEK Road Section Handling Project in Palu City using the LSM method, the completion time was 47 days. Meanwhile, in the initial planning, a completion time of 60 days was required, so there was a difference of 13 days. The project budget plan using the LSM method obtained IDR 2.321.225.151,01. Meanwhile, the initial project budget plan is Rp. 2,365,900,000.00 so there is a cost difference of Rp. 44.674.849.- By looking at the comparison of time effectiveness, scheduling using the LSM method is more effective and efficient
Karakteristik Kuat Geser Tanah Dengan Tanpa Akar Vegetasi Pada Lereng Ruas Tawaeli -Toboli
Full text linkThe contribution of vegetation to slope stability is based on hydrological and mechanical aspects. The effect of vegetation on the hydrological aspect is to reduce soil water content through transpiration, interception and evapotranspiration. And the mechanical influence of vegetation is through strengthening the roots in the soil. Water absorption by vegetation varies depending on age and density, rainfall factors and soil type. Cohesion (c) and friction angle () are soil shear strength parameters. In soil that has vegetation roots, it will form a composite material, namely the root-soil model, there is an increase in cohesion value with the presence of roots, this is what is called apparent cohesion (c'R). Several parameters that are believed to influence the shear strength of the soil and roots will also be studied, namely the physical properties of the roots, namely diameter, type of root/vegetation, and water content. For mechanical properties, namely the tensile strength of the roots, the shear strength parameters of the soil both without and with roots, namely cohesion, apparent cohesion and internal friction angle. The type of vegetation reviewed in this research is elephant grass with fibrous roots. The results obtained indirectly by increasing the value of cohesion and angle of friction in the soil due to the presence of roots influence/increase the shear strength of the soil. The volume of roots in the soil greatly influences changes in the cohesion value or angle of friction of the soil. As the root volume decreases, the shear strength value decreases, the shear strength parameter also decreases. In this study, the change in soil shear strength values in sandy soil conditions, the increase in cohesion value was not as significant compared to the change in friction angle values
Pengaruh Metode Pelaksanaan Terhadap Kinerja Waktu Proyek Rekonstruksi Jembatan di Kota Palu
Full text linkThe bridge reconstruction project is an effort to rebuild bridges that have been destroyed by the earthquake and tsunami that hit Palu City. The implementation of the bridge reconstruction project has complicated work that raises an analysis of the effect of the bridge project implementation method on project time performance. The purpose of this study was to determine the effect of implementation methods on the time performance of the bridge reconstruction project in Palu City. The sample of this study amounted to 22 workers on the bridge reconstruction project using Purposive Sampling method. The field collection process was carried out by collecting primary data in the form of interviews and distributing questionnaires. The data were processed using descriptive statistics and multiple linear regression analysis. The results of this study indicate that partially of the five variabels affecting the implementation method, the material factor variabel has a significant effect on the time performance of the bridge reconstruction project. While simultaneously work methods, labor, material factors, equipment, and project site conditions have an effect of 8,988 with a significant 0.000 on the variabel time performance of the bridge reconstruction project in Palu City