REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development

Evaluasi Dimensi Tiang Pancang Dermaga di Daerah Pesisir Kabupaten Kolaka dengan Mempertimbangkan Pengaruh Likuifaksi

2024-07-23T01:49:21+00:00

The pier in the coastal area of Kolaka Regency plays a crucial role in the distribution of goods and economic enhancement. However, the risk of liquefaction due to earthquakes threatens the stability and safety of the pier structure. This study aims to evaluate the dimensions of the pier piles considering the effects of liquefaction. The research methodology includes the analysis of liquefaction potential using the NCEER method, axial load capacity analysis using the Briaud method, and deflection analysis using the Broms method. Foundation analysis under liquefaction conditions is simplified by assuming the SPT values in the liquefied soil layer to be zero. Standard Penetration Test (SPT) data were used to assess soil conditions at the pier location. The analysis results indicate that the sand layer at a depth of 6-12 meters has a high potential for liquefaction, primarily due to the high content of coarse grains and a fine particle percentage of 15%. The increase in peak ground acceleration (PGA) in the Sulawesi region also amplifies the potential for liquefaction. The foundation analysis without considering liquefaction shows that the pile dimensions with a depth of 25 meters meet the design criteria, although deflection approaches the permissible limit. However, under liquefaction conditions, there is a slight reduction in axial load capacity (3%), but the pile deflection increases beyond the allowable limit. To mitigate the risk of liquefaction and ensure the safety of the pier, it is recommended to extend the pile depth to 28 meters.

Kuat Lentur Balok Laminasi Kombinasi Kayu Jawa (Lannea Coromandelica) dan Gelugu (Cocos nucifera)

2024-06-07T20:14:33+00:00

The use of kayu Jawa (Lannea coromandelica) and gelugu (Cocos nucifera) is very necessary to reduce the forests exploitation as a source of wood raw materials. However, both have debility in terms of mechanical properties and maximum dimensional achievement. Therefore, a mixed glulam system can be applied to produce lightweight structural timber beams with adequate performance. This research is aimed at determining the flexural strength, stiffness, ductility and failure of mixed glulam beams combined with kayu Jawa and Gelugu. A series of bending tests were carried out on timber beams using the three point bending method on three categories of beams, namely B-J, B-G and B-L. B-J beams, consist of solid timber of kayu jawa which has density ± 0,60 gr/cm3, B-K consist of solid gelugu which has density ± 0.88 gr/cm3, while B-L consists of kayu jawa timber in the core zone and one layer of 10 mm thick gelugu with a density of 0,88 gr/cm3 on the tension zone. Each beams category consists of five replications with the dimensions of each beam being 50 mm of wide, 55 mm of high and 760 mm of span. Laminated beams (B-L) are glued with emulsion adhesive with Viscosity 2,500 – 4,500 cPS, resin content 90 – 91%, gel time: 1 hour and curing time 5 – 6 hours with two-sided coating of 250 gr/m2 and clamping force 2 MPa. The results of this research show that the flexural strength (fb) and stiffness (EI) of mixed glue laminated laminated beams are 1,3 times higher than B-J. Apart from that, mixed glue laminated laminated beams (B-L) there was an increase the ductility of 47% when compared to B-G.

Karakteristik Ultrasonic Pulse Velocity Pada Perkerasan Jalan dengan Menggunakan Filler Bata Tahan Api

2024-06-07T20:27:45+00:00

Most 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.

Penerapan Metode SPI untuk Analisis Kekeringan di DAS Sombe - Lewara Kabupaten Sigi

2024-06-05T23:14:36+00:00

The 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.

Model Bangkitan dan Karakteristik Perjalanan pada Perumahan Kelapa Gading Kalukubula Kecamatan Sigi Biromaru

2024-05-02T20:46:41+00:00

Increasing population density will affect land use into residential/community housing areas and the emergence of settlements will increase the number of movements generated which can disrupt traffic flow which then reduces the level of road service. This research aims to model the generation of movement in the Kelapa Gading Kalukubula housing area and to determine the amount of traffic generation in the housing at present and in the future because the housing will continue to develop and will analyze the factors that influence the generation of traffic movement. Data collection was carried out by filling out a questionnaire which was distributed and given to residents using a sampling technique (stratified random sampling). To produce a good generation model based on ordinary less squares (OLS), the results of the questionnaire are processed and analyzed using multiple linear regression by SPSS software. Socio-economic characteristics and travel characteristics of the occupants of the house are tabulated as factors influencing the value of trip generation at Kelapa Gading Kalukubula Housing. The best model for generating movement in the Kelapa Gading Kalukubula housing complex is Y = -0.584 + 0.168 X₁ + 0.349 X₂ + 0.366 X₃ + 0.092 X₄ + 0.212 X5 with R2 = 0.695, F falue 159.138 where is X₁ amount of family member, X₂ is amount of worker in family member, X₃ is amount of students in family, X₄ is amount of car ownership, X₅ is amount of motorbike ownership. Based on this model, the total trip generation is 8289 trips/day and averange of trips is 3 trips/day, while the vehicle leaving housing from the Traffic Count is 9462 trips/day and vehicles entering the housing is 10397 trips/day

Sebaran Salinitas dan Temperatur Secara Horzontal di Muara Sungai Palu

2024-06-07T20:29:54+00:00

Salinity 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.

Hubungan Antara Kerusakan Jalan dengan Kecepatan Kendaraan (Studi Kasus pada Jalan Munif Rahman Kota Palu)

2023-07-20T22:15:03+00:00

Road 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.

Analisis Investasi Jasa Penyewaan Perancah (Scaffolding) di Kota Palu

2024-06-05T23:18:14+00:00

Scaffolding 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.

Pengaruh Kadar Aspal dan Kepadatan pada Nilai Kekesatan (Skid Resistance) Permukaan Perkerasan Beton Aspal Lapis Aus

2024-06-07T20:32:51+00:00

Asphalt concrete wearing course is located on the topmost surface layer so that this layer is indirect contact with vehicle wheels and other environmental factors, such as sunlight, rainwater. This condition makes asphalt concrete wearing course pavement susceptible to wear on the surface layer. This condition causes wear on the surface of the asphalt concrete wearing course pavement, so that the surface becomes slippery because the skid resistance decreases, especially in wet conditions. The large asphalt content and density of the mixture can affect the skid resistance of the asphalt concrete wearing course surface. The purpose of this study was to determine the effect of bitumen content and density on the skid resistance value of the asphalt concrete wearing course surface. This research was conducted at the Transportation and Highway Laboratory, Tadulako University. This study used five variations of asphalt content, namely 5.0%, 5.5%, 6.0%, 6.5% and 7.0% by weight of the mixture. Measurement of the skid resistance value of the asphalt concrete wearing course pavement surface using the British Pendulum Tester (BPT). The measurement procedure is based on SNI 4427: 2008. One-way ANOVA Method with a significance level of 95% is used to determine the effect of asphalt content and density on the surface skid resistance value of asphalt concrete wearing course pavement. The results of this study found that asphalt content and pavement density had affected the skid resistance value of the asphalt concrete wearing course pavement surface. The results of this study have also found that the relationship model between asphalt content and the skid resistance value of the asphalt concrete wearing course pavement surface is y= -2.8543x +87.965, R2= 0.8279. The relationship model between density and the surface skid resistance value of the asphalt concrete wearing course pavement, y = -85.006x + 2621.46, R2 = 0.935. This means that the higher the asphalt content and the density of the asphalt concrete wearing course pavement, the lower the surface skid resistance.

Perilaku Struktural Gable Frame Baja dengan Variasi Bentang, Jumlah Portal dan Kelas Situs pada Daerah Risiko Gempa Besar

2023-12-02T02:33:15+00:00

Limited 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.