REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development

Studi Keandalan Geolistrik Dalam Identifikasi Kebocoran Embung: Studi Kasus Embung Wolo, Sulawesi Tenggara

2024-01-09T00:52:53+00:00

Small dams are vital for supporting water resource conservation. The reservoir stores water from several water sources, especially in the rainy season, so that it remains available in the dry season. Some reservoir infrastructures were built using earthen fill materials located around it. This condition is very vulnerable to disasters, ranging from seepage to collapse. It is important to evaluate the safety of all potential dangers to minimize the risk of disasters. One method that can be used is the geoelectric method, which allows us to analyze the resistivity properties of the soil, but the reliability of this method needs to be further evaluated. This research aims to determine the reliability of geoelectric in identifying potential leaks in reservoirs. Geoelectric measurements were carried out at Wolo Small Dam using the Wenner-Schlumberger configuration with 32 electrodes at 2.5 m. Data collection was carried out at the top of the small dam so that it could provide the condition of the soil layer of the embankment material in the longitudinal direction. Validate the measurement using the results of previous research. The results of the analysis show that there are differences in lithology in the body of the reservoir, which indicates differences in the quality of work during construction. The interface between these two surfaces can lead to leaks. Apart from that, the analysis results also show the potential for piping in the reservoir. The location of the potential piping area is not far from the results obtained in previous research at the same location. This shows that geoelectric is quite capable of being a tool that can be used to identify leaks in reservoirs or other water structures. Of course, the combination of geoelectric and other soil testing will provide better results in anticipating disasters caused by small dam leaks

Perbandingan Kapasitas Kolom Beton Bertulang Berdasarkan Variasi Bentuk Sengkang dengan Analisis Finite Element Method

2023-12-02T02:31:56+00:00

Columns 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 diagrams

Analisis Profil Kecelakaan Konstruksi pada Proyek Bangunan Gedung di Indonesia

2024-01-15T01:21:47+00:00

The construction sector is the highest contributor to construction accidents, which is 31.9% of the total construction accidents. One of the leading causes of accidents is the need for more awareness from workers and companies of the importance of implementing OHS at work. This situation arises due to the need for maximum planning and implementation of the Construction Safety Management System through the Minister of Public Works and Public Housing, and the Indonesian government has issued Regulation Number 10 of 2021 concerning construction safety guidelines. Data collection in this study is secondary data, namely construction accident reports by the Construction Safety Committee. The analysis used is archival analysis, where the report is mapped to produce statistics on construction accidents based on the type of project, time of occurrence, day of occurrence, the impact of the accident, and the cause of the accident. The results showed that the building became the first rank of construction project types with a percentage of 35% where the occurrence was in the morning before noon, namely 08.00-12.00, and on Tuesday became a day that often occurred construction accidents based on the construction safety committee. It was found that the cause of the accident was dominated by human factors and work equipment, which would impact the damage to the building itself with a percentage of 56%. The results of this study will be helpful for implementers/construction accident experts as guidelines for the future

Pengaruh Perubahan Iklim Terhadap Kedalaman dan Intensitas Hujan

2023-11-24T22:46:17+00:00

Climate 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 trend

Pemetaan Ilmiah Topik Penelitian Perluasan Layanan Bus Rapid Transit (BRT) Trans Jateng

2023-11-24T22:52:29+00:00

Bus Rapid Transit (BRT) is one of the types of bus-based public transportation that provides fast, convenient, and affordable urban transportation. The BRT service in Central Java is called Trans Jateng and is managed by the Transportation Agency of Central Java Province. The operational concept of Trans Jateng is to serve routes that connect urban agglomeration areas in the province of Central Java. Trans Jateng plans to develop future services grouped into service corridors based on the existing development areas in Central Java, including the Kedungsepur, Wanarakuti, Banglor, Bregasmalang, Petanglong, Subosukowonosraten, Barlingmascakeb, and Purwomanggung agglomerations. In addition to opening new corridors, the development of Trans Jateng BRT services can also be carried out by expanding existing services; therefore, a comprehensive study is essential to monitor and track the progress of the research. This paper will map the literature on service expansion, BRT, and Trans Jateng. The literature database was taken from Google Scholar and analyzed using the VOSviewer tool with a mapping of previous research. The results of this research are highly useful for understanding the current development of research on the expansion of Trans Jateng BRT services in the future.

Perilaku Geoteknis Tanah Lanau yang Distabilisasi dengan Serutan Karet Ban

2024-01-15T01:31:32+00:00

Recently, developments in the geotechnical-environmental engineering field have become more attractive. One of the interesting efforts to be researched is how the geotechnical behavior of silty soil reinforced with fiber from shredded tires. This study aims to evaluate silty soil's mechanical properties, which are stabilized with shredded tires. This research involved shredded tire from used tire shreds with proportions of 2%, 3%, 4%, and 5% by dry weight of soil sample. The tests of soil physical properties and mechanical properties were conducted to evaluate the characteristics of the mixture soil. The unconfined compressive strength (UCS), shear strength, California Bearing Ratio (CBR) and cracking behavior were verified to evaluate the behavior of the silty soil–shredded tires mixture. The results showed that adding 2% shredded tires performed satisfied on some of the mechanical properties tested. These results illustrate the potential of utilizing shredded tires waste as an alternative material that can reduce tire rubber waste.

Kuat Lentur Balok Laminasi Kayu Mangga Berbasis Defeleksi dan Regangan dengan Sistem Pembebanan Four Point Bending

2024-01-15T01:18:59+00:00

To 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.

Analisis Keterkaitan Antara Aktivitas Kendaraan Bermotor dengan Tingkat Kebisingan: Studi Kasus di Jalan Gatot Subroto, Kota Palu

2023-10-16T03:29:12+00:00

The elevation of mobility in Palu has evolved into a new noise issue. Noise from motorized vehicles has quite an impact on the tranquility of areas that directly intersect with the highway. Gatot Subroto Axis Road is an instance of a congested road as public facilities such as educational institutions take the crowd of the area. The study aims to analyze the relationship of vehicle activities toward noise level at Gatot Subroto. The research method uses field measurement by a sound level meter (SLM), tripod, and counter. Noise sampling standards refer to SNI 8427:2017 regarding measuring environmental noise levels. Data was collected for one day on weekdays and weekends with three take times at three sampling points. Noise level analysis is carried out using frequency distribution. The next data analysis is to look for the equivalent noise level or LAeq. The noise level points varied between 71,6 dBA-84,02 dBA. The traffic volume reached a peak at 853. The p-value was 0,72 which was above 0,05. The regression test was Y=0,0048x+72,904, and R2 showed 0,15 points, which means that 15% of the noise level was affected by traffic volume. In conclusion, the average noise level at Gatot Subroto Axis Road exceeded the quality standards set according to the Decree of the Minister of State for the Environment No. 48 of 1996, which is 55 dB(A). Despite no significant difference in noise levels on weekdays and weekends based on the t-test, the noise level is affected by traffic volume. Noise from motorized vehicles has quite a big impact on the tranquility of areas that directly intersect with the highway. he limitation of this research is the limited amount of data due to the small number of research points and the insufficient number of days, so further research is needed.

Kapasitas Mekanik Panel Komposit Beton Ringan terhadap Beban Siklik

2024-01-15T01:35:18+00:00

The 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 Stabilitas Lereng Tambang Nikel Kabupaten Morowali

2024-01-15T01:29:18+00:00

Central Sulawesi Province is a province that has quite high mining activities, so an evaluation of the stability of open pit slope excavations needs to be carried out to prevent collapses during the exploration process which could result in loss of life. Analysis using the finite element method is one method that can be used to analyze slope deformation and stability during the excavation process. This research simulates excavation of a mine slope in 4 stages with a height of 5 m and a slope of 500. The analysis was carried out based on the results of the N-SPT test at three locations (GT-15617, GT-19125 and GT-19841) which are the slopes with the most extreme slopes. The analysis results show that at GT-15617 the maximum deformation occurred at stage 4 of the excavation at 0.18 m with a safety factor of 1.43, the maximum deformation at the GT-19125 location occurred at stage 4 at 0.21 m with a safety factor of 1.26 and at location GT-19841 maximum deformation occurred at stage 4 of 0.21 with a safety factor of 1.21. The overall safety factor analysis results do not meet the required minimum safety factor criteria.