OJS Universitas Tadulako
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Hubungan Antara Kerusakan Jalan dengan Kecepatan Kendaraan (Studi Kasus pada Jalan Munif Rahman Kota Palu)
Full text linkRoad damage indicates a condition where the structural and functional roads are no longer able to provide optimal service to traffic crossing the road. Traffic conditions and the types of vehicles that will cross a road greatly affect the design of construction planning and road pavement made. Asphalt or concrete pavement has frequent damage due to water entering the pavement so that it becomes damaged, this can be seen on Munif Rahman Street, Palu City, Central Sulawesi Province at Sta 0+000 – 2+200. The purpose of this study was to determine the relationship between vehicle speeds caused by various road damage conditions such as potholes, edge cracks, grain release, crests on Road Munif Rahman, Palu City, especially Sta. 0+000 – 2+200. The method used to determine the speed of the vehicle is the Spot Speed, and the Pavement Condition Index (PCI) method to determine the condition of the road pavement. From the results and discussion, some conclusions that can be drawn are the regression equation obtained is y = -0.0029x2 + 0.4101x + 10.841. R2 (R Square) obtained is R² = 0.3789. This means that the relationship between road damage and vehicle speed is 38% (poor), showing the relationship between the level of road damage and vehicle speed, that the lower the PCI value, the slower the vehicle speed as in Sta 1+900 to 2+000 with a PCI value of 13. (very poor) then obtained a vehicle speed of 14.611 km/hour. The results are inversely proportional to the influence of several factors in the research conditions, namely Sta. 1+300 to 1+400 with a PCI value of 33 (medium) then the vehicle speed is 26,800 km/hour, indicating that the lower the PCI value, the faster the vehicle speed, this is influenced by the driver, obstacles, and vehicle disturbances along the way. Munif Rahman street, Palu city
Kapasitas Mekanik Panel Komposit Beton Ringan terhadap Beban Siklik
Full text linkThe position of our country is included in the area Ring of Fire, where 90% of earthquakes on earth will occur in this region. Earthquakes in West Sumatra (2009), Mentawai (2010), Lombok and Palu (2018) have claimed more than 10,339 lives and more than 100,000 heavy damage to buildings. Building walls are generally made of brick or adobe, but these two materials have several disadvantages including weight and brittle. As a result of its considerable weight, it will increase the dead load of the structure so that the earthquake load will also increase. Thus, lightweight and clay materials (ductile) will be better if used as earthquake-resistant building walls and the level of risk is lower. Prefabricated sandwich panels produced by PT. BUILDING TECHNOLOGIES INDONESIA within BUKAKA TEKNIK UTAMA Tbk Group. to be a series of cyclic load tested full scale wall constructions. The conventional panel circuit model obtained the behavior of each swaying wall segment as an independent individual panel. Cyclic test results up to drift 12 were obtained with a maximum load of 4.245 kN with a maximum displacement of 106.28 mm compressive direction and a maximum load of 1.425 kN with a maximum displacement of 75.68 mm pulling direction. Deviation behavior is obtained that continues to increase as horizontal loads increase, but not until structural damage occurs in the series of 3 sandwich walls. This condition is a positive thing in the development of buildings with light materials to reduce the magnitude of the earthquake force and minimize damage and casualties
Analisis Investasi Jasa Penyewaan Perancah (Scaffolding) di Kota Palu
Full text linkScaffolding is an auxiliary construction used in multi-storey building construction work, used so that the implementation of work in the field can be easier and faster. As the development of building construction in the city of Palu, the need for the use of scaffolding is increasing. So it is interesting for researchers to find out whether investors in the field of scaffolding rental are still feasible for the coming years to move in this rental sector. The literature study method uses investment feasibility calculations, secondary data is taken from existing data in the field, namely the number of building construction works in Palu city, company financial cash flow data, and uses NPV (Net Present Value), EAV (Equivalent Annual Value), IRR (Internal Rate of Return) , and DPP (Discounted Payback Period). Assume income from the number of rentals and rental prices for the next 20 years. Interest rate of 8% and inflation of 3.85% for a period of 20 years at the PT Lexindo Scaffolding company obtained an NPV value of Rp.2,168,897,376 > 0, an EAV value of Rp.197,646,803 > 0, an IRR value of 33% > 8%, and DPP value of 4.98 years <20 years, for PT. Jaya Scaffolding obtained an NPV value of Rp.6,995,506,453 > 0, an EAV value of Rp.755,554,338 > 0, an IRR value of 30% > 8%, and a DPP value of 5.51 years <20 years. The conclusion states that the investment in scaffolding rental services is still feasible to invest
Sebaran Salinitas dan Temperatur Secara Horzontal di Muara Sungai Palu
Full text linkSalinity and temperature are easily measured oceanographic factors that play an important role in physical, chemical and biological processes in the ocean. Therefore, information on the distribution of temperature and salinity is very important. Palu River is the main channel that has an important function in flowing the discharge that empties into Palu Bay. The coastal waters around the mouth of Palu River is a potential area for social and economic development of the surrounding community. Dependence on so many important commercial fisheries in the estuarine waters is one of the main economic reasons for conserving this habitat. Based on this, this study was conducted with the aim of determining the distribution of salinity and temperature in the Palu River estuary. Data were collected at 11 observation stations from October 24, 2022 to October 26, 2022, horizontally. The methods used were theoretical approaches and field observations. Data processing used ArcGis 10.8 software and ODV (Ocean Data View) 4.0. The research results from the distribution of salinity at 11 observation stations horizontally ranged from 3.63 to 36.10 ppt, while the temperature ranged from 26.30 °C to 29.30 °C. Salinity and temperature values varied at each depth. It appears that the tides and the flow of river water affect the distribution of salinity and temperature
Karakteristik Ultrasonic Pulse Velocity Pada Perkerasan Jalan dengan Menggunakan Filler Bata Tahan Api
Full text linkMost road pavements in Indonesia use asphalt concrete mixtures. The choice of asphalt concrete is motivated by the fact that the mixture produces a waterproof and durable layer. However, this mixture has weaknesses related to tropical weather conditions. So the mixture is prone to damage, such as potholes and wavy roads. Coupled with heavy transportation equipment passing over the road construction. The development of technology in the field of construction is increasing, one of which is the increasing variety of technology to facilitate road construction work. This research uses the Portable Ultrasonic Nondestructive Digital Indicating Tester (PUNDIT) tool to perform a density analysis process based on the propagation speed of UPV, and this method has been widely used in Indonesia. Ultrasonic Pulse Velocity (UPV) is a tool used to determine material density. This study aims to determine the average ultrasonic wave propagation velocity in pavements before and after soaking using magnesia/converter type refractory brick filler material. This research was conducted at the Structures and Materials Laboratory, Faculty of Engineering, Hasanuddin University. Variations of 5%, 5.5%, 6% asphalt content using AC 60/70 asphalt mixture. Based on this research obtained before soaking: a. The average wave propagation speed of 5%, 5.5%, 6% asphalt content is 3279 m/s, 3473 m/s, 4001 m/s respectively. b The optimal average ultrasonic wave propagation speed value is found at 6% asphalt content, namely 4001 m/s. After soaking: a. The average wave propagation speed of 5%, 5.5%, 6% asphalt content is 3652 m/s, 3667 m/s, 3878 m/s, respectively. b The optimal average ultrasonic wave propagation speed value is found at 6% asphalt content, namely 3878 m/s
Perilaku Struktural Gable Frame Baja dengan Variasi Bentang, Jumlah Portal dan Kelas Situs pada Daerah Risiko Gempa Besar
Full text linkLimited land area and cross-sectional of steel profiles make planners have to choose the type of structure that is effective and efficient. Variations in the type of subgrade during an earthquake will give a different response to the structure which ultimately determines the dimensions of the structural elements. This study aims to determine the behavior of gable frame structures with variations in spans, number of portals and site classes. Modeling is done with variations of portal spans of 8, 24, and 30 m. The second variation is the number of portals, namely 1, 2 and 3 portals with a span of 24 m. The 3rd variation is in the form of class sites (hard, medium and soft soil) with a span of 2x24 m. The behavior analyzed is the base shear force, roof displacement and the demand to capacity ratio of the column and rafter. The 18 m span uses the IWF profile 200x150x6x9, the 24 m span uses the 300x150x6.5x9 profile and the 30 m span uses the 350x175x9x12 profile. The ratio of demand to capacity respectively for the column structure is 0.1909; 0.2560 and 0.2494 for spans of 18, 24 and 30 m. In the variation of the number of portals, it was found that designs 1, 2 and 3 had a Demand-Capacity Ratio value of 0.687 for rafters; 0.639 and 0.638 while in the column obtained respectively 0.713; 0.873 and 0.915. The design of the number of portals 1, 2 and 3 has a maximum deviation value of 68,699; 78,364 and 82,462 mm. In terms of serviceability, it shows a larger deviation and increases its capacity in resisting bending and compression. The results of the analysis of the 3 models with variations in soil sites show that hard soil, medium soil and soft soil have base shear force values of 205,163 kN, 337,883 kN, and 269,899 kN and the maximum deviation at the top of the building is 61,981 mm, 102,079 mm, and 37,642 mm
Pengaruh Perubahan Iklim Terhadap Kedalaman dan Intensitas Hujan
Full text linkClimate change is a natural phenomenon where there is a very extreme change in the value of climatological elements. The increase in floods and droughts is caused by changes in the characteristics of rain that are far below normal. This study aims to determine the trend of climate change resulting in changes in the characteristics of rain, namely the depth and intensity of rain. Assessment of climate change is seen from trend graphs and the Mann-Kendall statistical test to determine significant changes. To determine the effect of climate change on the characteristics, of rainfall, the calculation is divided into 3 periods, namely period 1 (1994-2003), period 2 (2004-2014), and period 3 (2014-2018). Based on the Mann-Kendall statistical test, climate change also occurred as indicated by a significant Z value, namely the Kediri and Sopak climatological stations 4.64 and 6.26, respectively. The pattern of changes in the daily average rain depth and intensity has occurred from 1994 – 2018 where in period 1 in 1994-2003 there was a normal trend, in period 2 in 2004-2013 there was an increasing trend and in period 3 in 2014-2018, there was an extreme increasing tren
Perbandingan Kapasitas Kolom Beton Bertulang Berdasarkan Variasi Bentuk Sengkang dengan Analisis Finite Element Method
Full text linkColumns are one of the structural elements that greatly influence the behaviour of the structure. Columns are capable of holding axial compression loads and transmitting them to the structural elements below. Column capacity can be increased by the confinement of lateral reinforcement/stirrup. The stirrups function to maintain the compressive strength capacity of the concrete column before and after spalling. Advances in software technology have had a very significant impact on the development of structural element analysis methods, including software based on the Finite Element Method (FEM), Abaqus/CAE Student Edition. It can also simplify several laboratory research of Civil Engineering into a simulation. However, in simulation practice, parameters in the form of material data are needed as input. To get the same behaviour between the test object and the simulation, convergent parameters are needed. The parameters to be analyzed are CDP (Concrete Damage Plasticity) plastic parameters. While the simulation for loading, shape of the test object, and placement refers to the results of previous studies. The reinforced concrete column test model used consists of 5 (five) different variations of stirrups. The results of the simulation show that reinforced concrete columns with stirrups provide support in the form of shear force capacity that can maintain the value of the axial compressive strength capacity. From the five existing test models, it was obtained that the increase in the value of the axial compressive strength capacity of the column due to the variation of stirrups for column B, column C, column D, and column E to column A (without stirrups) were 115%, 120%, 121%, and 119% consecutively. The output values from the analysis include the diagrams of axial force and displacement, column interaction diagrams, and material stress-strain diagram
Kuat Lentur Balok Laminasi Kayu Mangga Berbasis Defeleksi dan Regangan dengan Sistem Pembebanan Four Point Bending
Full text linkTo meet the standard needs of low-quality wood structures, special methods are needed that can meet these needs. So the shape of the structure was developed, not whole wood but laminated components made through gluing or commonly called laminated beams This study aims to determine the difference between laminated beams and solid blocks of mango wood through testing the bending strength of beams. The research method used in this study uses quantitative methods with an experimental method approach. The research conducted used Mango wood samples with two types of block treatment, namely laminated beams and solid blocks. The laminated beam is made using 5 layers of Mango wood with a size after lamination of 1200 x 100 x 50 mm. As for solid beams using a size of 1200 x 100 x 50 mm. Then the wood is tested by applying two centralized loads on two pedestals at a distance of 30 cm from the pedestal. The results showed that from testing mechanical properties which in this case is limited only by flexural strength testing. The flexural strength test in question is four point bending. The results of the flexural strength test obtained an average value of modulus of elasticity (MOE) of laminated beams of 6804.796 MPa while for solid beams of 9130.465 MPa. According to SNI 7973-2013. The average value of bending strength (MOE) was obtained 6804.796 MPa for laminated wood and 9130.465 MPa for solid wood. According to SNI 7973-2013, the value of laminated wood in this study is included in the E13 quality code. As for solid wood, it is included in the E18 quality code. This shows that the MOE value of solid beams is greater than the MOE of laminated beams. Then in the modulus of rapture (MOR) test, the average MOR value of laminated beams was 66.205 MPa and solid beams of 95.007 MPa. This shows that the MOR value of laminated beams is smaller than the MOR value of solid beams
Penerapan Metode SPI untuk Analisis Kekeringan di DAS Sombe - Lewara Kabupaten Sigi
Full text linkThe level of drought and wetness is a standard in estimating conditions in an area that occur in the past, present, and future. By knowing the SPI value of an area, it can be known the drought distribution map which aims to handle drought disaster mitigation and adaptation. This research aims to see how much the level of drought, wetness, and normal conditions that occur in the Sombe Lewara Watershed, Sigi Regency so that prevention can be carried out and the basis for government policy-making in the event of a drought disaster. The method used in this research is the SPI (Standardized Precipitation Index) method which is commonly used to determine the deviation of rainfall from the norm, in a period (monthly, bi-monthly, quarterly, and so on). This method is one of the analysis methods of the many techniques to obtain the existing drought index. In this study, the data used is rainfall data for 19 years (2003 - 2021) obtained from Porame Rain Station. The rainfall data is then processed to obtain the SPI value in the Sombe Lewara watershed. For the calculation of SPI, the processed rainfall data is then transferred to the gamma distribution to obtain the SPI value. SPI-1 index (1.145) with moderately wet conditions, SPI-3 (0.640) with normal conditions, SPI-6 (-0.234) with normal conditions, SPI-9 (1.578) with dry conditions, and SPI-12 (1.017) with moderately dry conditions.From 2003 - 2021, the year that experienced the worst drought conditions was in 2014 in SPI-1 with an SPI value of -3.888 (very dry). After all SPI values are averaged, the standard SPI value of the Sombe Lewara Watershed is in normal conditions with a value of 0.829