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REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development
Published by Universitas Tadulako
ISSN : 27233472     EISSN : 27461033     DOI : https://doi.org/10.22487/renstra
Core Subject : Science, Social, Engineering,
Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Engineering Environmental Science Transportation
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development is a peer-reviewed journal published by the Civil Engineering Department, Engineering Faculty, Tadulako University. The journal is to publish research articles or original literature reviews covering all concentrations in the fields of Civil and Applied Engineering including Structural Engineering, Geotechnical Engineering, Water Resources Management, and Engineering, Transportation Engineering and Management, Construction Project Management, and other applied sciences related to the engineering field. Articles submitted for publication in the journal must have never been published by other media or journals and are free from plagiarism. It is a six-monthly journal, open-access and published in collaboration with the Indonesian Society for Geotechnical Engineering, Regional Commissariat of Central Sulawesi, and Indonesia Transportation Society, Central Sulawesi.
Arjuna Subject : Teknik (semua kategori) - Teknik Sipil dan Struktur
Articles 106 Documents
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Analisis Hubungan Kecepatan Rerata Terhadap Kecepatan Permukaan Untuk Penentuan Kekasaran Dasar Pada Aliran Saluran Terbuka Widayanti, D.A.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 2, Issue 2 (September 2021)
Publisher : Civil Engineering Department, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v2i2.260

Abstract

The flow velocity of a channel may be used to determine the value of n-Manning, which is the coefficient representing the ruggedness of a hydraulic in a channel. Because of the difficulties in determining the value of n-Manning accurately on the field, this study is aimed to analyze the correlation between the mean flow velocity of a channel (U) and the flow velocity point (u(Vi,dj)) with d = 0.0D; 0.2D; 0.6D in order to determine the precise value of n-Manning of a channel. Vi, the vertical i represents the measurement point of transversal velocity (b/B), dj represents coordinate of the depth value of the flow. In conducting the study, the researcher analyzed the ratio between the mean flow velocity of a channel (U) towards the flow velocity point (u(Vi,dj)) for certain types of channel namely the coefficient k value; it was being analyzed based on several positions of measurement of transversal velocity, b/B. The types of channel used were the natural channel/ rivers (the middle part of Opak River, the upstream of Opak River, and the Kuning River), the Mataram Channel turn, the non-uniform of the Mataram Channel, the laboratory turn channel, and the straight laboratory channel. The result of the analysis of the k value was used to calculate the value of n-Manning. The final result was then compared to the value of n-Manning based on the empirical calculation. Based on the study, the result of the k value of d = 0.0D; 0.1D; 0.2D dan 0.6D for the data on the edge channel (b/B = 0,25) shows the greater range value than the k range value on the middle channel (b/B = 0,50). The k value on the middle channel is stable or relatively equal in all of the determined channels. The n-Manning value based on the k value and the formula of empirical calculation shows the close range value, especially for the data of the rivers and the Mataram Channel. Meanwhile, the data of the laboratory channel shows that the n-Manning value based on the empirical calculation is lower than the nManning value based on the k value.
Daya Dukung Tanah Pasir Dengan Perkuatan Geotekstil Tipe UW 150 Terhadap Variasi Lebar Fondasi dan Perkuatan Martini, Martini; Cristina, V.I.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 2, Issue 2 (September 2021)
Publisher : Civil Engineering Department, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v2i2.261

Abstract

Sand are soils that have low bearing capacity and are more affected by density. Therefore it is necessary to improve sand soil to increase the bearing capacity of the soil. One method of soil mechanical improvement is by inserting a sheet of reinforcement (geotextile) on the sand. The purpose of this research is to study the relationship of width of foundation (B) and width of reinforcement (Br) in increasing the support capacity of sandy soil and to know soil bearing capacity of sand at condition without and with reinforcement.The purpose of this research to know the modeling on sand in a test tub madeby steel plate with size 80cm x 80cm with a shallow foundation model measuring 8 cm x 8 cm, 10 cm x 10 cm and 12 cm x 12 cm. Loading is given by using a hydraulic jack. The soil is formed with a 50% relative density with the width of reinforcement (Br) inserted were 4B, 5B and 6B with the depth (u) 0.5B, spacing (z) 0.25B and a 3-sheet reinforecment (N)), where B is the width Foundation. Furthermore, it is determined the bearing capacity of the limit and the ratio of its bearing capacity (BCR).The result shows that giving the geotextile sheet on sand soil can increase the bearing capacity against the condition without reinforcement. Bearing capacity increases as the width of the foundation (B) is wider and the width of reinforcement (Br) or geotextile is wider. Based on the Tangent Intersection Method theory, the largest bearing capacity obtained at the width of the foundation (B) 12cm x 12cm and the reinforcing width (Br) 6B is 153 kN/m2 with 2.06 of the bearing capacity ratio. For the vesic theory, the largest bearing capacity obtained at the width of the foundation (B) 12cm x 12cm 274kN/m2 for the width of the 6B reinforcement with 3.32 of the bearing capacity ratio (BCR).
Analisis Hidrologi dan Hidraulika pada Bangunan Pelimpah (Studi Kasus: Bangunan Pelimpah Bendungan Tugu) Rizki, L.L.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 2, Issue 2 (September 2021)
Publisher : Civil Engineering Department, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v2i2.267

Abstract

Hydraulic design for spillway is a fundamental part of dam design. This research aims to conduct flow simulation at spillway of Tugu Dam using HEC-RAS program. Thus, simulation later is compared to Detailed Engineering Design. This simulation is carried out as the basis for analyzing the ability of the Tugu Dam spillway to flow the outflow discharge using the HEC-HMS program. The HEC-RAS simulation results show that the Tugu Dam spillway is able to drain DED outflow discharge but there is still runoff at the end of the channel. The HEC-HMS simulation provides the design flood discharge values for Q1000 and QPMF are 820 m3/s and 1161.2 m3/s, respectively. This result is higher than the DED design flood discharge of 670.95 m3/s for Q1000 and 928.44 m3/s for QPMF. Thus, changes were made to the spillway width to 45 m, the channel width to 40 m, and to raise the embankment +2 m in the lead channel and the end channel. The results of the flow simulation in the spillway with a modified design using HEC-RAS shows that there is no overtopping in the spillway. These indicate the spillway is able to flow the HEC-HMS design flood discharge properly.
Pengetahuan Masyarakat dalam Melakukan Rekonstruksi Rumah Tinggal Pasca Gempa di Kabupaten Donggala Yusriah, A.R.; Fahirah, Fahirah
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 2, Issue 2 (September 2021)
Publisher : Civil Engineering Department, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v2i2.269

Abstract

Earthquake is a natural event that can not be avoided resulting in the number of buildings damaged, building construction plays an important role in the development process in each area, in this case the knowledge of the community when rebuilding houses is very important to know. This study aims to identify people's knowledge in reconstructing residential houses after the earthquake. The method used in this study was by distributing questionnaires to the affected communities, especially in Marana Village as many as 80 families. Data analysis uses descriptive statistics, reliability tests, Relative Rank Index (RRI) and Spearman's Rho correlation. The results of the study that the dominant variable of the community in reconstructing residential houses know how to repair the bones on the walls of the RRI with a value of RRI of 0.820, know how to fix the bone in the column with the RRI value of 0.800, know the type of mixture for the column with the RRI value of 0.780, know the comparison of concrete mixture for the column with the RRI value of 0.760, know the good bones used for the column with the RRI value of 0.740. The relationship between the highest dominant variables is the behavior of the community in knowing how to repair the bone on the wall of the hoe correlated with whether the public knows how to repair the bones in the column, obtaining the highest value of 0.672 including the criteria of strong correlation.
Pemodelan Resiko Kecelakaan Berbasis Kondisi Kendaraan dan Pengemudi Putra, A.; Narendra, A.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 2, Issue 2 (September 2021)
Publisher : Civil Engineering Department, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v2i2.332

Abstract

Traffic accidents are particularly prone to occur mainly caused by vehicle speed, vehicle damage, alcohol influence, and fatigue. The study aims to model the risk of vehicle and driver-based accidents occurring across Queensland, Australia. The data in this study used a dataset of accident factors on Queensland state roads totaling 3412 accidents sourced from the Australian state government of Queensland. Research data period from 2001-2019. This research method uses multinomial logistic regression modeling analysis. The results of this study produced several models, namely; (1) Log odds in the risk level of death vs hospitalization will increase by 1,028 if affected by vehicle damage, increase by 0.731 if affected by fatigue, increase by 0.158 if affected by vehicle speed, increase by 0.151 if influenced by alcohol. (2) Log opportunities in the risk level of death vs. medical care will increase by 0.786 if affected by vehicle damage, increase by 0.375 if affected by fatigue, decrease by 0.003 if affected by vehicle speed, decrease by 0.078 if influenced by alcohol. (3) Log odds in the risk of death vs minor injury will increase by 0.484 if affected by vehicle damage, increase by 0.245 if affected by fatigue, decrease by 0.156 if affected by vehicle speed, decrease by 0.266 if influenced by alcohol. (4) Log odds in the risk of death vs property damage will increase by 1,254 if affected by vehicle damage, increase by 0.828 if affected by fatigue, increase by 0.185 if influenced by vehicle speed, increase by 0.128 if influenced by alcohol. The validation test value with crosstab method explains that the accuracy result of level 1 has an accuracy value of 0.99 and inaccuracy of 0.01 then the result of level 2 to level 5 has an accuracy value of 1.
Analisis Ketersediaan Air Waduk Gadjah Mungkur dengan Adanya Pembangunan Intake dan Jaringan Pipa Trasmisi Wosusokas Cantik, B.K.P.; Fitriana, I.R.; Diandra, N.; Valentino, S.; Tambing, A.K.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 2, Issue 2 (September 2021)
Publisher : Civil Engineering Department, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v2i2.333

Abstract

Gadjah Mungkur Reservoir is one of the multipurpose reservoirs built by damming the flow of the Bengawan Solo River. The Gadjah Mungkur Reservoir has existed for a long time with the main purpose of controlling flooding, but over time, this reservoir is also useful as a hydropower plant, irrigation, and also to meet the raw water needs of Wonogiri City. The potential of the Gadjah Mungkur Reservoir itself in meeting the needs of drinking water is an essential function in the people’s life around the reservoir. Therefore, the expansion of the scope of providing drinking water can be used to develop the potential of the Gadjah Mungkur Reservoir. This coverage expansion was realized through the construction of the Wosusokas intake and transmission pipeline network to drinking water receiving areas, namely Wonogiri, Sukoharjo, Solo, and Karanganyar, with service coverage of drinking water access resepectively ±78,38, ±70,97%, ±81,85%, and ±70,97%. This study aims to analyze the water availability of the Gadjah Mungkur Reservoir with additional coverage for drinking water services. The method used is a simple reservoir routing calculation by processing secondary data obtained in the form of inflow, outflow, and reservoir storage characteristics. The results of the analysis show that elevation variations with the construction of the Wosusokas intake and transmission pipeline have an annual average of +132,56 m in 2017, with a reservoir storage volume reaching 216,27 MCM and +134,29 m in 2018, with a reservoir storage volume reaching 284,92 MCM. However, there are some elevation values that exceed +138,0 m, namely at February to March 2018. However, overall, the results of the analysis show that the Wosusokas construction can increase the potential utilization of the Gadjah Mungkur Reservoir without endangering the reservoir with water level fluctuations that can still be controlled and in accordance with the regulation of reservoir water level.
Analisis Hidrograf DAS Poso dengan Metode Hidrograf Satuan Sintetis Snyder dan Hidrograf Satuan Sintetis Soil Conversation Service (SCS) Kahffi, A.; Lipu, S.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 2, Issue 2 (September 2021)
Publisher : Civil Engineering Department, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v2i2.334

Abstract

The Poso River is a river located in Poso Regency, Central Sulawesi Province, which has a length of 74.58 km, and watershed area of 1092.810 km2. Energy in the Poso River is used for hydroelectric power plant (PLTA). With the construction of the Poso hydropower plant, maximum flood discharge data is needed for the prevention of Poso hydro power plant safety. In calculating the flood discharge, the method used is a synthetic unit hydrograph. Synthetic unit hydrograph is a graph of the relationship between flow rate (Q) and time (t). In this study, the method used to calculate the designed flood discharge is the Snyder synthetic unit hydrograph method and the Soil Conversation Service (SCS) synthetic unit hydrograph. The aims of this study are to determine the largest flood discharge value and to determine the hydrograph shapes of the two methods. The parameters that will be obtained from both methods are peak time (Tp), base time (Tb) and peak discharge (Qp). From the analysis it can be found that in the Snyder SUH method, the peak time (Tp) is 12.616 hours, the base time (Tb) is 67.276 hours with a peak discharge (Qp) of 21.672 m3sec. Whereas in the SCS SUH method, the peak time (Tp) is 10.954 hours, the base time (Tb) is 57.268 hours with a peak discharge (Qp) of 20.751 m3/sec. The result demonstrates the result that the largest flood discharge has occurred in the Snyder SUH method.
Analisis Kompetensi Kerja Tukang Plester di Kota Palu Asnudin, A.; Ridwan, M.A.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 2, Issue 2 (September 2021)
Publisher : Civil Engineering Department, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v2i2.335

Abstract

One effort to empower the implementation of construction projects in order to maintain the quality of the final work is the application of competency standards for workers who hold a strategic position in determining the quality of the final building, in this case plaster workers. The aims of this research was to know the application of plasterer competency standards based on the Indonesian National Work Competency Standards (SKKNI) on building projects in Palu City. This research was conducted on plasterers of buildings in the city of Palu. The research method used was literature study, the primary data collection was done by distributing the questionnaires. The selected respondents were plasterers. Data were processed by using descriptive statistical methods and using the Relative Rank Index (RRI). The results showed that the application of plasterers' work competency standards based on SKKNI was around 80% to 90% which had been well implemented, namely, carrying out Preparation of Plastering Work, Carrying Out Plaster Mixing Mixes, Carrying Plaster Work. In addition, around 20% to 30% have not been well implemented, namely, the use of PPE and WSE, Making Job Reports.
Studi Pemisahan Aliran Dasar Metode Local Minimum Method Daerah Aliran Sungai Miu Oktavia, S.R.; Mantika, O.A.; Rugaiyah, Rugaiyah
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 2, Issue 2 (September 2021)
Publisher : Civil Engineering Department, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v2i2.336

Abstract

The two main elements of a river flow hydrograph are direct runoff and baseflow. Base flow is a flow that comes from groundwater and it is available during the rainy and dry seasons. Information of baseflow value of a watershed has an important meaning in efforts to develop and manage water resources, including the provision of clean water, irrigation systems, flood management and others. Miu watershed located in Sigi Regency often experiences natural disasters such as floods and droughts that occur almost every year, which is the research location with an area of 65,452.01 Ha. This study aims to determine the value of baseflow using the Local Minimum Method and to find out whether this method can be used for baseflow modeling in research watersheds. This study was conducted using Hydro Office software with input data in the form of daily discharge data from 2004 to 2013. The average baseflow value obtained was 5.43 m3/s. The process of calibrating the baseflow value by taking flow data in the dry season where there is no rainfall input. It is obtained that BFI have value an average of 0.89. This value indicates that the Miu watershed has high storage permeability characteristics, The Miu watershed has quite stable flow during dry periods, because the greater the BFI value, the better the water supply in a watershed. In the statistical test, the observed discharge is the discharge data from the measurement results for the period 2004-2013, while the calculated discharge is the result of the estimated base flow value obtained using the graphical method. From the results of the statistical test of RMSE and R2, the RMSE value was 0.147 and the R2 value was 0.751. Both statistical tests show that the local minimum method has a fairly good performance in modeling the base flow in the Miu watershed.
Studi Laju Infiltrasi Pada Lahan Irigasi Gumbasa (Studi Kasus di BGKn 38, 42 dan 51) Afrianto, B.; Sutapa, I.W.; Hidayat, N.; Herman, R.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 3 Issue 1 (March 2022)
Publisher : Civil Engineering Department, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v3i1.329

Abstract

The 2018 earthquake that shook the city of Palu and surrounding areas with the power of 7.4 MW triggered liquefaction in several locations. Earthquakes and liquefaction that occurred caused damage to Gumbasa’s irrigation canals and some paddy fields. This study was conducted at three points in the paddy fields which 2 points located in the Soulowe village and Sidera village, District of Dolo and one is located in the Lolu village, District of Biromaru. This study aims to determine the infiltration rate in the residents’s paddy fields which have not been planted with paddy for a long time. This is because until the data retrieval performed, Gumbasa irrigation network has not functioned and still under repair. Data were collected using a Double Ring Infiltrometer measuring instrument. The results obtained from this study for constant infiltration rate of BGKn 38 = 1.27 cm/hour, BGKn 42 = 1.10 cm/hour and BGKn 51  = 0.75 cm/hour, which all three are classified as a rather slow with a constant infiltration rate ranging from 0.5 to 2 cm/hour. For the difference in fc values, BGKn 38 and BGKn 42 at 0.17 cm/hour and BGKn 42 and BGKn 51 at 0.35 cm/hour, so that BGKn 38 and BGKn 51 is 0.52 cm/hour. Meanwhile, the value of the difference f0 from the three points is BGKn 38 with BGKn 42 at 3.82 cm/hour and BGKn 42 with BGKn 51 at 4.43 cm/hour, and BGKn 38 with BGKn 51 is 0.61 cm/hour.

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