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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 715 Documents
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Perencanaan Struktur Beton Bertulang Tahan Gempa Berlantai 4 (Studi Kasus Gedung Baru Kampus I Universitas Teknologi Yogyakarta) Algazt Arsyad Masagala; Faqih Ma'arif
Semesta Teknika Vol 19, No 1 (2016): MEI 2016
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v19i1.1829

Abstract

The new building in campus one of Universitas Teknologi Yogyakarta which consists of four floors is analyzed by using Intermediate Moment Resisting Frame (IMRF) to be able to withstand gravity and seismic load. The planning of reinforced concrete structure in this building is aimed to 1) to calculate the gravity and seismic plan load that works for the new building in campus one of Universitas Teknologi Yogyakarta, 2) to find the dimension of beam and column that able to withstand the working seismic plan load, 3) to determine the formation of beam and column reinforcement from the analysis result by using Intermediate Moment Resisting Frame (IMRF). The building structure analysis is conducted using SAP 2000 V.11 program. The planning of reinforced concrete structure is assumed as Intermediate Moment Resisting Frame/Structure (IMRF). The planning of beam and column is conducted by using the dimension in the field. The reinforced planning is conducted base on the Assessment Regulation of Reinforced Concrete Structure for Infrastructure with SNI 03-2847-2002. The assessment of static equivalent seismic load is referred to Standards of Earthquake Resistance Planning for Buildings with SNI-03-1727-2002. Based on the analysis by using Intermediate Moment Resisting Frame (IMRF), the planning of reinforced concrete structure including dimension and reinforced formation of beam and column has fulfilled the requirements and save based on field assessment.   
Analisis Kinerja dan Tarif Angkutan Umum Bus Jurusan Surakarta-Yogyakarta: Studi Kasus pada Bus Langsung Jaya, Jaya Putra dan Sri Mulyo Suwardi Suwardi
Semesta Teknika Vol 12, No 1 (2009): MEI 2009
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v12i1.743

Abstract

One of the supporting factors to improve connection between Surakarta and Yogyakarta, is the adequacy of public transportation. With the existence of adequate public transportation that meet the standard, especially Yogyakarta – Surakarta buses, activities in the two cities can be expected to increase. The activities can be economic, politic, social, safety, scientific or the others.  The existing public transportation between Surakarta – Yogyakarta, needs to be evaluated because public might not satisfy the standard. The objective of the research is to analyse the operational cost and tariff of public buses serving Yogyakarta – Surakarta line.  The method of this research is descriptive analysis.  In this research, public work on transportation in this region was analyzed in order to improve its condition in the future. Primary data include the number of passenger, travel time, departure and arrival time.  Secondary data obtained from the bus companies consist of direct and indirect operational costs, as well as fixed and variable cost. The results show that the passenger tariff after yield analysis with headway 4 minutes and the average load factor of 55.83% is IDR 8,720. At headway of  4 minutes and passenger tariff of IDR 8,000 bus companies are still suffering from loss. If the headway changed to 6 minutes , the load factor became  83.75%  and the passenger tariff of IDR 5,800. It is lower than the current passenger tariff of IDR 8,000. The changing of headway from 4 minutes to 6 minutes may increase bus company profit by 27%. 
Uji Triaksial Unconsolidated-Undrained pada Campuran Tanah Lanau - Kapur - Abu Sekam Padi dan Serat Karung Plastik Widianti, Anita; Hartono, Edi; Muntohar, Agus Setyo
Semesta Teknika Vol 11, No 2 (2008): NOVEMBER 2008
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v11i2.765

Abstract

Geotechnical and mechanical behaviour of soil stabilized with lime-rice husk ash and strengthened by randomly placed plastic fiber depends on the portions of the added materials and curing time. This research investigates the effect of the waste plastic sack fibers portion and the curing time to the stress – strain relationship and to the shear strength parameters of the mixture. In this study the portions of lime and rice husk ash were set as constant to the value of 12% and 24% respectively. The effect of four waste plastic sack fibers portion variation from 0.1% to 0.8% was measured by unconsolidated-undrained triaxial test. The samples were tested at 7, 14 and 21 days after mixing. In general, according to the test result, the inclusion of randomly waste plastic sack fiber and curing time have enhanced the shear strength parameters, the peak stress and the strain before failure.  With 0.2% fiber content, the cohesion and the internal friction angle values of the samples have increased 335% and 409% respectively compared with those of the samples having no added materials.
Aplikasi GIS dan Simulasi Banjir Sungai Siak Pekanbaru Menggunakan XP-SWMM Yusri Yusri; Othman A. Karim; Mohd. Ekhwan Toriman; Mohd. Khairul Amri Kamarudin
Semesta Teknika Vol 12, No 2 (2009): NOVEMBER 2009
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v12i2.734

Abstract

Pekanbaru, the capital of Riau province, consists of 12 localities and covering an area of 632.26 square kilometer. The current land utilization in this city may create sufcare hydrology problems, such as flooding and shortage of water. The objective of this work is to analyse the land utilization pattern in Pekanbaru in 2004 in conjunction with flooding problem. The ArcView GIS 3.2 software package was implemented to analyse the land utilization data provided by a satelite, and the XP-SWMM hydrodynamic software package was used to simulate the flooding of Siak river in Pekanbaru. The result showed that land utilization was dominated for farming (49.26%), followed by vegetation, forestry, and settlement (17.09%, 13.06% and 11.97%, respectively). The simulation revealed that the flood occured in 28 December 2004 had submerged three regions, i.e. Sri Meranti, Meranti Pandak, and Pesisir, covering an area of approximately 880 hectare. In addition to this, bigger floods had been predicted to occure in the near future if the utilization of land is not pecisely managed.
Studi Perbandingan Dinding Geser dan Bracing Tunggal Konsentris sebagai Pengaku pada Gedung Bertingkat Tinggi Astuti, Pinta
Semesta Teknika Vol 19, No 2 (2016): NOVEMBER 2016
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v19i2.2390

Abstract

All of high-rise buildings should have sufficient stiffness the structure  will existed when earthquake occurred. The addition of shear wall structure and concentrically single bracing are alternative way to increase stiffness of the structure. This research is comparating the natural period of the structure with variation of stiffener structure between shear wall structure and concentrically single bracing by taking a case study at Mataram City Apartments and Condominium, Yogyakarta. The building consists of two towers and every tower consist of 18 stories. Analytical calculations in this research based on technical data field, quality of materials, and the results of structural analysis with numerical program. The calculation based on SNI 03-1726-2002, SNI 03-1726-2012, and the Uniform Building Code (UBC) 1997 Chapter 16 on Requirements Design Structure. Three modification of the shear wall layouts in this research are use to understanding about the effect of adding shear walls and concentrically single bracing to the natural period structure. Based on the calculation, the structure has adequate capacity to support the load with the natural period of 1.83 seconds. Maximum allowable vibration time by SNI 03-1726-2002 is 3.24 seconds, SNI 03-1726-2012 is 2,59 seconds, while the Uniform Building Code (UBC) is 1.68 seconds. So, the natural period requirement for this structure is 1.68 seconds. From all models, only the last model which have sufficient stiffness with natural period that 1.66 seconds for shear wall and 1.67 for concentrically single bracing stiffener. 
Analisis Ketepatan Penghitung Frekuensi dengan Metode Pencacahan Berbasis Mikrokontroler Freddy Kurniawan; Agus Basukesti
Semesta Teknika Vol 11, No 2 (2008): NOVEMBER 2008
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v11i2.761

Abstract

A frequency counter is an electronic instrument, or component of one, that is used for measuring frequency. Frequency counters usually measure the number of oscillations or pulse per second in a repetitive electronic signal. A digital-signal frequency counter, can measure the number of positive-going-transition or the number of negative-going-transition of signal in a set of period time. This microcontroller-based frequency counter work by using a counter, which accumulates the number of negative-going-transitions occurring within two periods for 16-bit microcontroller-timer overflow. After the period, the value in the counter is divided by the period and transferred to a display. This frequency counter can measure frequency from 100 Hz to 1 MHz. The upper limit of frequency can be extended up to 256 MHz by adding a frequency divider. The analysis of the accuracy of measuring presented in this article can support to determine the number of digit to display.  
Pengaruh Pemodelan Kotak Resapan Buatan di Saluran Drainase terhadap Debit Limpasan Sabarani Adinda; Burhan Barid; Jaza'ul Ikhsan
Semesta Teknika Vol 17, No 1 (2014): MEI 2014
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v17i1.411

Abstract

Drainage isasewer system in an areathat serves todrain excess rainfall. Initially, an artificial drainage channel could absorb water because the drainage channel is made from landorland with grass. Negative impacts frequently occurrence on the channel walls that are eroded by water see page. While the current drainage channel is impermeable, making direct runoff flows rapidly into water bodies. Land use is increasingly impermeable resulting bigger runoff and causing negative impacts, such as floods and decreasing groundwater savings due to rainfall directly flows into water bodies orriver nearby. In this paper, authortried tomake adrainage channel innovation by making boxes infiltration along the concrete channel. The aim of the study is to determine the effect of artificial recharge box modeling along drainage channels in reducing runoff using wastel and and grintinggrass(Cynodondactylon) media, determine the ratio of absorptionability between box wastel and media and Grinting grassmedia in reducing runoff using concrete channel/watertight as a reference. The model is made of wood with the size of 750×30×20cm and 5catchment box made every distance of 100cm along the channel, then the water flowed into the channel for an hour, and velocity data taken every five minutes before and after the flow through the box and also water level data taken every five minutes. The result shows that artificial recharge box with wasteland media can reduce runoff entering the channel, with the ability to reduce runoff at first hour about of 38.322% and it will decrease every hour, on it is smallest on the fourth hour 4 about of 28.038%. Also, a model with grintinggrass media can reduce runoff and the largestefficiency value is about 49.744% in first hour. Channel modeling with artificial recharges box using grinting grass media is better than only using wasteland for reducing.
Pengaruh Tuned Mass Damper (TMD) Terhadap Respons Getaran pada Struktur Bangunan Dedi Suryadi; M. Rasyid Ridlo; Novalio Daratha; Indra Agustian
Semesta Teknika Vol 24, No 2 (2021): NOVEMBER 2021
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v24i2.12727

Abstract

Penelitian ini didasari oleh banyaknya kehancuran struktur bangunan yang terjadi akibat gempa bumi, sehingga dibutuhkan suatu sistem peredam yang efektif sebagai solusi untuk struktur bangunan. Penelitian ini menganalisis pengaruh penambahan Tuned Mass Damper (TMD) pada struktur bangunan berlantai satu. Penelitian ini dilakukan pengujian secara eksperimental dengan cara membandingkan respons getaran struktur tanpa TMD dan dengan penambahan TMD. Nilai rasio massa dan kekakuan yang gunakan masing-masing adalah dari 2% sampai 20% dari nilai parameter struktur utama dengan variasi kenaikan 2% untuk setiap langkah.  Rasio massa didefinisikan sebagai perbandingan massa struktur dengan massa damper, sedangkan rasio kekakuan adalah perbandingan antara kekakuan struktur dan kekakuan damper. Frekuensi gaya gangguan adalah sebesar 10,5 rad/s, 11 rad/s, dan 11,5 rad/s. Hasil penelitian ini menunjukkan bahwa penambahan TMD pada struktur dengan rasio TMD yang tepat cukup efektif dalam mengurangi respons amplitudo pada struktur. Nilai rasio TMD dengan md 12% dan kd 10% untuk frekuensi gaya gangguan 11,5 rad/s memperlihatkan hasil reduksi amplitudo struktur sebesar 75,19% dibandingkan dengan amplitudo struktur tanpa TMD.
Pengaruh Waktu Pengeringan Dan Tempering Terhadap Mutu Beras Pada Pengeringan Gabah Lapisan Tipis Prasetyo, Totok; A, Kamaruddin; D, Made K; T, Armansyah H; N, Leopold
Semesta Teknika Vol 11, No 1 (2008): MEI 2008
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v11i1.771

Abstract

The aim of this research was to determine the effect of various drying and tempering durations on rice quality using thin layer drying. The drying procedure consist four satge; first rough rice was dried in a drying chamber for various durations to remove 5 to 8 % moisture content (M.C). In the second stage rice was tempered under the room temperature for certain duration, to reduce MC gradients within the kernels. tempering period. The rice was then dried further to reach the final 14 % M.C. After the second drying the rice was tempered. Drying process was conducted using  heated air at temperature of either 50 0C, RH 26%  or  60 0C, RH 17%. The results  show that very small  reduction in Head Rice Yield (HRY) when  less than 6 % m.c, were removed during the first drying stage. Effects on HRY was obeserved when the moisture removal was greater than 6% m.c. during the 1st drying stage. It was also observed that tempering time could not prevent the reduction in HRY when moisture remomal was higher than 6% M.C. during the 1st drying stage.
Analisis Waktu Pelaksanaan Proyek Konstruksi dengan Variasi Penambahan Jam Kerja Priyo, Mandiyo; Sartika, Sartika
Semesta Teknika Vol 17, No 2 (2014): NOVEMBER 2014
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v17i2.417

Abstract

Time and cost greatly affect the success and failure of a project. Measure of the success of a project is usually seen short turnaround time at minimal cost without leaving the quality of result. Systematic project management is required to ensure the project implementation time in accordance with the contract or even faster that the cost could provide benefits. And also avoid any penalties due to delays in project completion. Purpose of this study is to calculate the change of cost and time of implementation project with variations additional hours of 1 hour to 4 hours of overtime by using microsoft project programs. And to compare the results between the cost of fines with changes in costs before and after the addition of working hours (overtime). The results of this study have shown that (1) The minimum project cost was obtained at the time of normal conditions without the addition of overtime hours Rp 25,923,636,641.50 while for the minimum time the project was obtained on the addition of 4 hours is 197.84 days of normal duration of 217 days with the addition of cost of Rp 215,838,008.94 from the normal total cost of Rp. 25,923,636,641.50 to Rp 26,139,474,650.44 (2) Additional hours worked best option is additional three hours of work, in this condition the costs Rp 139,469,427.19 with profits generated Rp 327 156 .032,35.

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