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Semesta Teknika
Published by Universitas Muhammadiyah Yogyakarta
ISSN : 1411061X     EISSN : 25025481     DOI : https://doi.org/10.18196/st
Core Subject : Engineering,
Engineering
SEMESTA TEKNIKA is a reputable refereed journal devoted to the publication and dissemination of basic and applied research in engineering. SEMESTA TEKNIKA is a forum for publishing high quality papers and references in engineering science and technology. The Journal is published by the Faculty of Engineering, Universitas Muhammadiyah Yogyakarta, INDONESIA. Copyright is by the publisher and the authors. The Journal is issued in electronic form and also issued in printed form as annual volume for the contributors only. The journal contains original research papers, review articles, short notes and letters to the editors. The topics of interest include modeling, experimental, analytical and numerical investigations on the mechanical, physical, chemical and mineralogical properties of material, developing the prototype/instrument, technology and construction process. Topic of management in industry and civil construction is also considered. SEMESTA TEKNIKA receives manuscripts from the contributor written in the Indonesian and English. Manuscripts submitted to the journal for publication must not have been previously published or is under consideration simultaneously by any other publication. Manuscripts submitted to SEMESTA TEKNIKA will be reviewed Peer Reviewers local and foreign.
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Articles 22 Documents
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Search results for , issue "Vol 21, No 1 (2018): MEI 2018" : 22 Documents clear
Pengaturan Lalulintas Kereta Api di Stasiun Cicalengka untuk Mendukung Pengoperasian Jalur Ganda Kereta Api Bandung-Cibatu Setiawan M, Dian; Devi P, Rahardhita Luthfiana; Rosyidi, Sri Atmaja P
Semesta Teknika Vol 21, No 1 (2018): MEI 2018
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.211205

Abstract

Indonesian Railway Authority plans to build a double railway track between Bandung-Cibatu which is currently the densest service line in Bandung Regency. Cicalengka Station is one of the major stations in this line service. This study aims to plan the train traffic arrangement at Cicalengka Station. The Conflict Rate Matrix Table was used as a simple simulation method to analyse the train journey route (formed, used, conflicted) and the degree of route usage against train frequency. The results showed that the Cicalengka Station on double track system would be passed by 98 passenger trains and planned to have two primary track (II and III) which are used for the direct train journey through the station. Track I, IV, V, and VI are the siding tracks that used for a railway stop. Cicalengka Station is also planned to have a route that is formed and is used each amounted to 10 routes (A to J). The conflict degree is 0.84, and the degree of route usage against train frequency is 0.75. Furthermore, it can be concluded that the percentage of non-conflicted route increased from 16% to 25%.
Kajian Angkutan Sedimen Di Sungai Pabelan, Kabupaten Magelang, Jawa Tengah Fauziyah, Risky; Kironoto, Bambang Agus; Legono, Djoko
Semesta Teknika Vol 21, No 1 (2018): MEI 2018
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.211210

Abstract

Pabelan River is one of the rivers in the western slopes of mount Merapi located in Magelang Regency, Central Java province. Pabelan River has watersheds ± 84,70 km2 with the main river length ± 28,40 km2. The purpose of this research was to estimate the amount of sediment transport that occurred at the point of view in the Pabelan River and to know estimate of sediment balance that occurred at the point of view in the Pabelan River. This research was conducted to find out the sediment balance in the Pabelan River whether going on degradation, aggradation, or experience the equilibrium transport. Calculation of sediment balances based on the volume of sediment transport entering at the location selected. Based on the results of sediment transport analysis using MPM, EINSTEIN, DU BOYS and ROTTNER formula, the largest sediment transport volume occurred in PA-C 5 = 4850,592 m3/m/flood, 305,8398 m3/m/flood,  20321,979  m3/m/flood  and 80274,221 m3/m/flood, while the result of calculation based on formula FRIJLINK largest sediment transport volume occurred at PA-C 3 = 3654,817 m3/m/flood. To obtain the result of equilibrium sediment that occurred in the river of research  is by using the five formula  with the condition of the river that occurred aggradation and  degradation with the biggest condition is the result of calculation with the formula ROTTNER for aggradation occurs in PA-C X Prumpung  amount of 47272,806 m3/m/s with increase river bed amount of 13,504 m and degradation occurred at PA-C 5   -47468,692 m3/m/s with decrease at river bed -23,698 m.
Analisis Prioritas Rehabilitasi Bendung:Studi Kasus Bendung Cokrobedog, Gamping, Pendowo dan Pijenan di Kali Bedog Putri, Nanda Melyadi
Semesta Teknika Vol 21, No 1 (2018): MEI 2018
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.211206

Abstract

The government provided Special Allocation Budget via APBD for rehabilitation activities in order to increase the function and physical condition of the weirs. The rehabilitation performances must be run stage by stage due to the limitation of allocation budget, however, it would be continual. Hence the analysis of rehabilitation priority was needed. The case study of this research was the determination of rehabilitation priority towards the weirs of Cokrobedog, Gamping, Pendowo, and Pijenan. These four weirs were at Kali Bedog, Daerah Istimewa Yogyakarta.The method used for priority analysis in this research was Multi Attribute Decision Making method (MADM), consisted of AHP, ELECTRE, SAW, TOPSIS, and WP. The criterias used were the infrastructure conditions, the availability of water, and the command areas by the percentage weighting of assessment criteria at 57 , 29 and 14. The damage percentage of Gamping was 44.66%, ranked as serious damage. The damage percentage of Cokrobedog, Pendowo and Pijenan for each of it was 36.11%, 33.57% and 30.30%, ranked as average damage. The order of priority rehabilitation of dams tend not begin with the largest command area. TOPSIS method is a method most appropriate MADM applied in the prioritization of rehabilitation because it has a significantly different end value.
Penerapan Metode Clustering dengan Algoritma K-Means pada Pengelompokkan Data Calon Mahasiswa Baru di Universitas Muhammadiyah Yogyakarta (Studi Kasus: Fakultas Kedokteran dan Ilmu Kesehatan, dan Fakultas Ilmu Sosial dan Ilmu Politik) Asroni, Asroni; Fitri, Hidayatul; Prasetyo, Eko
Semesta Teknika Vol 21, No 1 (2018): MEI 2018
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.211211

Abstract

The increasing new prospective students in a University to make the stack more and more data, departing from it then conducted a search for new knowledge with data mining. Grouping data for prospective new students will be made by the method Clustering and used the algorithm k-means. In this penmaru there are 5 data attributes are used i.e., hometown, gender, status to qualify for selection, driveways, and majors. This analysis is performed using WEKA software and the source data taken from admissions data (penmaru) in the form of a data warehouse. Class from the use of this method is the attribute of the majors. Iteration performed as many as 3 times and the number of a cluster at the Faculty of medicine and health sciences, i.e. 4 clusters, Faculty of social and political science 3 clusters. Method Clustering can be applied to the classification of data for prospective new students. Another thing that can be analyzed from the results of the grouping candidate data, promotion strategies from each Department to increase the quantity and quality.
Studi Numerik Pengaruh Ukuran Penampang, Rasio Tulangan Lentur dan Jarak Tulangan Geser Terhadap Kekakuan Balok Beton Bertulang Menggunakan Program Respone 2000 Prayuda, Hakas; Saleh, Fadillawaty; Istiawan, Istiawan
Semesta Teknika Vol 21, No 1 (2018): MEI 2018
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.211207

Abstract

One of the reinforced concrete beam behavior can be seen from the value of deflection, maximum load, and the relationship between moment with curvature and stiffness of the beam. Respone 2000 program is an approach program with numerical method that can be used to analyze the reinforced concrete beam. The results of this program include the value of deflection, maximum load, moment and curvature. This study aims to obtain numerical results in the form of stiffness of the beam, deflection value, maximum load, moment and curvature until the crack pattern occurs. This research was done by making 32 sample beam with variation of cross section of beam, flexural reinforcement ratio and shear reinforcement distance. The result of the analysis shows that the length of the span has a big effect on the deflection value, the maximum load and the stiffness but not the nominal moment. The results of the reinforcement ratio in this study greatly affect the deflection value, the masimum load, the nominal moment and the stiffness of the beam, while the shear reinforcement distance affects the beam behavior but only on some specimens.
Evaluasi Sistem Proteksi Kebakaran pada Bangunan Hotel UNY 5 Lantai Di Yogyakarta Zulfiar, Muhammad Heri; Gunawan, Akhid
Semesta Teknika Vol 21, No 1 (2018): MEI 2018
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.211212

Abstract

Fire is an event that causes many losses. Fire in multi-storey buildings will cause many losses. Some fire events in comersial multi-storey buildings can be used to be mitigation reference to decrease fire risk. Hotel is one of comersial buildings that has a safety standard to the occupants. One of the protection form is making protection for fire hazard. This research is conducted at UNY Hotel located at Karangmalang Street Caturtunggal Depok Sleman Yogyakarta. By this research, hopefully UNY Hotel can be the reference of fire protection system for the others comersial buildings in Yogyakarta.The purpose of this research is to assess the completeness of facilities and infrastructure of fire protection system that available at UNY Hotel. The method is by observation process and assessment of 4 parameters of reliability of building safety system, that are site completeness, rescue device, active protection, and passive protection with reference to Regulation of Minister of Public Works Number 26/PRT/M/2008 about Technical Requirement of Protection System Fire on Building and Environment Building and Fire Safety Building Inspection Guidebook (Pd-T-11-2005-C) from Research and Development Agency of Ministry of Public Works and several related Indonesian National Standards.The results of the Reliability Building Safety System is 91,60 which means the value of the reliability of the building at UNY Hotel is good. So, UNY Hotel building can be used optimally and building users get protection from fire building hazard.
Respon Model Gedung Beton Bertulang dengan Penambahan Dinding Pengisi terhadap Beban Gempa Syamsi, Muhammad Ibnu
Semesta Teknika Vol 21, No 1 (2018): MEI 2018
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.211208

Abstract

Earthquake-resistant building structures designs usually are not considering the influence of non-structural walls. In fact, non-structural walls could give additional strength for building especially to help retaining seismic loads. The Influence of masonry walls on infill frame building structure model to the open frame model became the objective in this study. Spectrum response and time history are applied to both types of model to know and compare the behavior of those two samples. The observed building is an educational facility and located in an area prone to earthquakes. The parameters used in this research are based on natural periods, shear forces, and drift ratios. After performing linear analysis, the drift ratio on each floor of the building could be categorized as safe condition because it has not exceeded its limit. Structural models with masonry walls have larger stiffness than open frames. Moreover, the greater structure stiffness in the infill frame model is able to narrow the drifts that occur from the inter-story drift ratio to be smaller. Due to higher stiffness, the base shear results from structures with infill frame system models are also larger than structures modeled with open frames system.
Studi Optimasi Waktu dan Biaya dengan Metode Time Cost Trade Off pada Proyek Konstruksi Pembangunan Gedung Olah Raga (Gor) Priyo, Mandiyo; Paridi, Meiki Risa Anggriani
Semesta Teknika Vol 21, No 1 (2018): MEI 2018
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.211213

Abstract

Cost and time analysis are most important on the contruction project. Optimal Time and minimal cost become standart to make profit benchmarks on a project. Therefore, it is necessary to optimize the cost and time by looking for work items that are included in the critical path. The purpose of this study is to know the change of cost and time due to the addition of working time, change of cost and time due to the addition of employee, as well as cost that needed if the projects experienced delays and penalty.. So it will be compared from all three to get the minimum cost with the optimum duration.The data used in this study is secondary data obtained from contractor implementing. Data analysis using time cost trade off method with microsoft project 2010 program. The results of the study, From the time cost trade off with the addition of 1 hours of work per day conducted on first day on critical jobs during the project, obtained the reduction in the cost of Rp 39,552,394,71 and the reduction in the duration of 36.18 days. Addition of 2 hours of work per day obtained the reduction in the cost of Rp 57,532,834.66 and and the reduction in the duration of 62.61 days. Addition of 3 hours of work per day obtained the reduction in the cost of Rp 69,392,147,01 and and the reduction in the duration of 82.48 days. Meanwhile, for the addition of employee for 1 hours obtained the reduction in the cost of Rp 52.497.085,35 and the reduction in the duration of 36.18 days. Addition of employee for 2 hours obtained the reduction in the cost of Rp 91,349,394.80 and the reduction in the duration of 62.61 days. Addition of employee for 3 hours obtained the reduction in the cost of Rp 120,645,301,55 and the reduction in the duration of 82,48 days. So that, the optimal time and cost occur when addition employee is incurred for 3 hours, compared to overtime and overdue. Namely with the optimal cost of the project of Rp 2,418,408,305.45 and the optimal duration of the project for 57.52 days.
Analisis Preferensi Penggunaan Moda Kereta Api Bandara Menuju New Yogyakarta International Airport Setiawan, Danny
Semesta Teknika Vol 21, No 1 (2018): MEI 2018
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.211209

Abstract

Relocation Adisutjipto Airport to New Yogyakarta International Airport (NYIA) within ±45 km from Yogyakarta city center by airport train as a liaison transportation modal, it is needed the research of passenger preferences in transportation modal choice analyze to NYIA. Data collection methods used by stated preference (SP) and analyzed by ordered probit model. The results showed ideal distance of air passengers which willing to use the airport train when the airport distance to the city about 37 km. The airplane passenger willingness to pay (WTP) that state “definite use” airport train is about 56.00% for alternative 8. The WTP of airport train NYIA is IDR 50.067 with priority level of service is punctuality. The congestion condition from Yogyakarta city to NYIA airport will decrease 46.75% because the passenger using airport train.
Risiko Kestabilan Lereng Akibat Gempabumi (Studi Area di Kecamatan Patuk, Kabupaten Gunungkidul) Hari Suryana, Eka Priangga; Pramumidjojo, Subagyo; Satryarno, Iman
Semesta Teknika Vol 21, No 1 (2018): MEI 2018
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.211215

Abstract

The research about risk of slope stability as an effort to mitigate landslide slopes due to the earthquake, based on the earthquake of Jogja 2006 along the Opak River fault. The methods used in this study refers to the PERKA BNPB number 2 of 2012, which conducts a qualitative assessment of the landslide control parameters. Slope stability test is done as an effort to see the effect from earthquake to slope using SLOPE / W software. Test results at 3 locations, each slope in a stable state under normal conditions without earthquake. The first slope (1) in Patuk village has a value ofsafety factor is 2.45, while in earthquake condition has safety factor number is 1.27. The value of the safety factor on the second slope (2) in Ngoro-oro village under normal condition safety factor is 2.22 and the earthquake condition has value safety factor is 0.74. The third slope (3) in Ngoro-oro village has a safety factor number is 3.62 while in earthquake condition has value 1.95. The result of landslide risk calculation use first (1) scenario in Patuk sub-district generally has medium class, with yellow color in landslide risk map. Patuk villages has high class level for landslide risk map, meanwhile Terbah and Semoyo villages have low level class for landslide risk map. The slope in Patuk sub-district has stable conditions againts earthquake, but the change from slope material caused by weathering can made trigger landslide in future.

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