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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 682 Documents
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Pengaruh Perubahan Suhu pada Modulus Elastik Lapisan Beraspal Perkerasan Lentur dalam Pengujian Regangan yang Berbeda Hardwiyono, Sentot
Jurnal Semesta Teknika Vol 14, No 1 (2011): MEI 2011
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Abstract

Flexible pavement strength (Flexible Pavement) is affected by changes in the nature around the changes in temperature affect the strength asphalt layer and seasonal changes (precipitation) affect the strength of the soil layer is not particularly asphalt base. Research to determine the effect of temperature for a layer of flexible pavement in the field can be done in two ways. The first destructive test (Destructive Test, DT) such as core-drill are routed by means of a laboratory test using Universal Testing Machine (UTM). The second test is not destructive (Non Destructive Test, NDT) such as direct field test using a Falling Weight Deflectometer (FWD) and tools Spectral Analysis of Surface Wave (SASW). Testing the temperature of use as has been mentioned with a different strain performed at the Soekarno-Hatta road and highway Cikampek-Purwakarta, Bandung, West Java, Indonesia. Testing methods and testing different strain rates produce different elastic modulus values in testing asphalt flexible pavement layer. The general conclusion, the higher the temperature imposed on the asphalt pavement layer elastic modulus flexural yield whose value has declined. Conversely the lower the temperature imposed on the asphalt pavement layer elastic flexural modulus values produce increasingly rising. Different strain rate testing (FWD, UTM and SASW) on asphalt pavement layer is influenced also by changes in temperature.
Perkuatan Lentur Pelat Lantai Tampang Persegi dengan Penambahan Tulangan Tarik dan Komposit Mortar Hartono, Juandra; Satyarno, Iman; Triwiyono, Andreas
Jurnal Semesta Teknika Vol 13, No 1 (2010): MEI 2010
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Overloading of structures can cause failure. In order to continue using them, strengthening is required. In this research elastic strengthening was carried out on concrete floor plates by means of tensile reinforcement addition, and mortar composite additionto apply epoxy resin. Four reinforced concrete slabs, consisted of one control slab (PK), one monolith slab (PM), one strengthened slab (PPE) and one unstrengthened slab (PPTE). Specimen dimensions were 700 mm x 1500 mm x 60 mm for the PK, and 700 mm x 1500 mm x 100 mm for the others. Specimens were placed on a simply supported loading frame, and statically loaded at their mid-span. Numerical analysis using Response-2000 software package was carried out for comparison with the experiment al result. It was found out that the flexural capacity of the PK, PPE, PPTE and PM specimens are 5,99 kNm, 12,52 kNm, 13,87 kNm and 21,38 kNm, respectively. In comparison with that of thePK, flexural capacity of the PPE and PPTE specimens was found to increase by 109,019 % and 131,55 %, respectively. The increase of stiffness was 324,77 % and 430,21 % for the PPE and PPTE specimens, respectively. The ductility factor of the PPE and PPTE increase 29,63 % and 19,03 %, respectively . The PK and PM specimen s experienced flexural failure, while the PPE and PPTE specimens experienced debondingfailure.
Konsep Earned Value dalam Aplikasi Pengelolaan Proyek Konstruksi Priyo, Mandiyo; Wibowo, Noor Adi
Semesta Teknika Vol 11, No 2 (2008): NOVEMBER 2008
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Earned value concept is one of monitoring technique on construction process which is based on the integrated concept of cost and time. Using integrity of time and performance of field works, earned value method can accommodate the need of performance monitoring of construction project. The aim of this research is to observe the suitability of construction cost and time in the report compared to the plan report. In this research, observed data were taken from the bridge replacement project. The results show that the project construction at the end of 4th, 8th and 12th week with positive value of schedule variances, SV = 2.20 week, 0.4606 week and 0.9963 week, respectively, present the construction process is faster than schedule. While, positive value of cost variances, CV = IDR 3,543,762.17, IDR 115,583,274.67 and IDR 206,090,828.00 at the end of 4th, 8th and 12th week  shows that the cost of construction project is lower than budget plan. However, evaluation at the end of 16th week shows that the SV value is -0.1946 which means that the construction works are delayed from the schedule. Based on its CV value of IDR 196,892,110.00, the cost project is lower than the budget. These results are supported with the performance index of SPI which is lower than 1 and CPI is higher than 1.  
Sifat-sifat Tarik dan Flexural Komposit Serat Sabut Kelapa Unidireksional/Poliester Sudarisman, Sudarisman; Kamiel, Berli P; Rahadi, Slamet
Semesta Teknika Vol 17, No 2 (2014): NOVEMBER 2014
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The purpose of this study is to investigate the tensile and flexural properties of unidirectional coconut fiber/polyester composite materials, and to describe their failure modes. Specimens were cut from fiber/polyester composite plates containing various fiber contents. Materials being used in this study are coconut fiber that was previously alkali-treated and polyester resin matrix. Whilst tensile testing was carried out in accordance with the ASTM D3039 standard, flexural testing was based on the ASTM D790 standard. Failure surfaces of the representative specimens were then observed under an optical microscope, and their digital photo macrographs were captured for image analysis in order to describe their respective fiber distribution pattern and to determine their respective actual fiber volume fraction, Vf, by means of an open source software called ImageJ. It was found out that the actual Vf of the four composite plates being produced were 10.7%, 17.6%, 27.4% and 40.5%. It was revealed that while tensile strength increases with the increase of Vf, while failure strain, modulus elasticity and flexural strength decreases. The average highest tensile strength, tensile failure strain, and tensile modulus of elasticity were found being 30.01 MPa at Vf = 40.5%, 0.027 mm/mm at  = 0%, and 1.47 GPa at Vf = 0%, respectively. The average highest flexural strength, failure strain and modulus of elasticity were observed being 153.92 MPa at Vf = 10.7%, 0.0358 mm/mm at Vf = 0%, and 3.242 GPa at Vf =10.7%, respectively. It was observed that specimens were failed by fiber pull out and debonding.
Evaluasi Pengaruh Fungsi Aktifasi Dan Parameter Kemiringannya Terhadap Unjukkerja Pengenalan Jaringan Syaraf Tiruan (Studi Kasus Pada Pengenalan Karakter Angka Tulisan Tangan) Suhardi, Irwan
Jurnal Semesta Teknika Vol 10, No 1 (2007): MEI 2007
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Jaringan syaraf tiruan merupakan salah satu topik baru yang menarik untuk dikaji dikarenakan mampu menangani permasalahan yang sangat kompleks.  Salah satu variabel yang berperan pokok untuk menghasilkan unjukkerja jaringan syaraf tiruan yaitu pemilihan parameter  fungsi aktifasinya. Tulisan ini mencoba menganalisis pengaruh fungsi aktivasi terhadap unjukkerja jaringan syaraf tiruan terutama parameter kemiringannya. Sebagai studi kasus dalam penelitian ini yaitu sejauh mana jaringan syaraf tiruan mampu mengenali pola karakter tulisan tangan. Pola karakter yang akan dicoba untuk dikenali yaitu karakter angka (dari 0 sampai 9). Permasalahan yang dihadapi dalam pengenalan pola tulisan tangan sangat kompleks, antara lain bervariasinya model tulisan tangan, pena untuk menulis, dan ukuran tulisan tangan. Didapatkan kesimpulan bahwa parameter kemiringan fungsi aktivasi untuk menghasilkan unjukkerja pengenalan terbaik didapatkan pada nilai kemiringan  0,8 dengan menggunakan sigmoid bipolar.
Interpretasi Letak Bidang Longsor dan Faktor Aman Lereng dengan Bahasa Pemrograman MATLAB Anita Widianti, Joko Supriyadi ,
Jurnal Semesta Teknika Vol 14, No 2 (2011): NOVEMBER 2011
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Slope stability analyses can be performed using computer program, such as Matrix Laboratory (MATLAB). In the current work, a computer program for slope stability analysis named JOZLOPE based on MATLAB and using Bishop simplified analysis method was used to determine the location of a slip surface and its safety factor. The validation is carried out by analyzing three simple slope models and comparing their results by JOZLOPE and some comparator slope stability analysis programs. It is found that the variations between JOZLOPE’s results and those of the comparators are less than 1% for bottom circle-slope geometry intersection, less than 7% for top circle-slope geometry intersection  and less than 4% for Safety Factor. These findings demonstrates  that the a MATLAB program is successfully compiled and it produced measured values that agree with those of their respective comparator.  
Pengaruh Beban Pada Permukaan Tanah Dan Frekuensi Gempa Terhadap Respon Seismik Linier Elastis Lapisan Tanah Pujianto, As’at
Semesta Teknika Vol 8, No 1 (2005): MEI 2005
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Respon seismik lapisan tanah akibat gempa merupakan suatu parameter gerakan tanah akibat gempa. Selama getaran merambat dari pusat gempa sampai ke permukaan tanah, maka faktor tanah sebagai penghantar getaran mempunyai peran yang sangat penting. Berbagai parameter penting mengenai jenis tanah tersebut meliputi keadaan geologi secara lokal dan kondisi tanah itu sendiri. Di samping itu juga ada beberapa faktor yang berpengaruh terhadap respon tanah, di antaranya adalah indeks plastisitas (PI), kandungan frekwensi gempa serta keadaan beban diatas permukaan lapisan tanah. Beban pada permukaan lapisan tanah akan berpengaruh terhadap kekakuannya. Kekakuan tanah yang mempunyai beban lebih kecil akan berbeda dengan tanah yang mempunyai beban lebih besar. Dengan keadaan seperti itu maka tanah yang mempunyai berat beban bangunan berbeda akan menghasilkan respon yang berbeda juga. Penelitian dengan menggunakan satu data profil tanah tanpa beban dan lima variasi pembebanan telah dilakukan, akibat gempa Koyna dan Bucharets yang telah dinormalisai, sehingga hanya mempunyai perbedaan frekuensi. Analisis hitungan menggunakan program sederhana dengan dasar metode analisis dinamika struktur “Multi Degree of Freedom” dan pemodelan matematis lapisan tanah berupa model “Shear Building” serta penyelesaian problema dinamik dengan metode numerik “Central Difference”. Hasil analisis menunjukan bahwa Semakin besar beban mengakibatkan simpangan semakin kecil. Dengan percepatan maksimum sama akibat gempa Koyna dan Bucharest, namun mempunyai frekuensi yang berbeda,  mengakibatkan respon yang tidak sama besar. Parameter percepatan tanah bukan satu-satunya parameter yang dapat dipakai untuk mengetahui damage potential suatu gempa tetapi terdapat parameter lain yang harus diperhatikan. Kandungan frekuensi gempa Koyna maupun Bucharest terhadap frekuensi struktur masih cukup jauh (tidak berimpit), sehingga jika terjadi gempa dengan frekuensi tersebut struktur tanah tidak akan mengalami resonansi.  
Aplikasi Value Engineering pada Proyek Konstruksi (Studi Kasus: Proyek Pembangunan Gedung BPKP Yogyakarta) Priyo, Mandiyo; Hermawan, Totok Dwi
Jurnal Semesta Teknika Vol 13, No 2 (2010): NOVEMBER 2010
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Construction of a building project or the others structures needs cost, so that the project can be realized. Before an owner continues the project to the design or construction steps, the cost must be provided. The cost often becomes a problem because amount of the cost is limited to realize a construction project. The objective of this study is to select good alternative materials without declining the quality and function of the building as well as to find the value of cost efficiency on the Project of the BPK’s Office Building Construction of Yogyakarta by Value Engineering method. Value Engineering is a management thenique with systematic approach for finding the balance among cost, reliability, and performance of a product or a project. The study on the Project of the BPKP’s Office Building Construction of Yogyakarta was done on the structure work only, namely: plate, beam, column and sloof works with giving alternative materials for getting the best alternative by work plan of Value Engineering. The Value Engineering method was applied on structure components by systematic and creative approach trough work plan of Value Engineering using the following steps: an information, functional analysis, creative, development, writing and presentation steps. All steps were done continuesly and the result was expected giving efficiency from the previous design. From the application of Value Engineering, it is concluded that the cost efficiency is about 2.53% of total cost of structure work by application.
Sekam Padi Untuk Proses Pack Karburising Baja Karbon Rendah Soemowidagdo, Arianto Leman
Jurnal Semesta Teknika Vol 12, No 1 (2009): MEI 2009
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The effectiveness of rice husk on pack carburizing process of low-carbon steel was investigated. The process was carried out at 850°C for 2, 4 and 6 hours. Carbon content of the specimen materials is 0.082%. Rice husk charcoal and rice husk powder was then compared to graphite powder. All of the media were sifted on 50 mesh sieve. After the process, all specimens were reheated up to 850°C, and then, hold it for 5 minutes. Subsequently, they were quenched into water at 28°C. The result shows that the effectiveness of rice husk charcoal is better than those of other media being used in the investigation. Six hours pack carburizing utilized, rice husk charcoal resulted in the enhancement of steel surface hardness from 122 VHN to 465 VHN and increase of the proportion of martensite structure.
Analisis Drainasi di Saluran Cakung Lama Akibat Hujan Maksimum Tahun 2013 dan 2014 Harsanto, Puji; Lesmana, Surya Budi; Devianty, Sherly
Semesta Teknika Vol 17, No 2 (2014): NOVEMBER 2014
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Flooding is an annual disaster for Indonesia. Jakarta is a city that each year nearly always experienced by flooding. The rapid development made the impervious area dropped drastically. Micro drainage is not capable of passing the volume of direct runoff. It makes many regions in Jakarta experienced by floodwaters. The aim of this research is to analyze the micro drainage capacity in Cakung Lama River. Simulations are performed with HEC-RAS 1D. The flood data is maximum rainfall on 2013 and 2014. Two scenarios normalization is done for reducing the inundated area around the river. Based on the simulation results, the existing conditions are not able to accommodate the discharge due to maximum rainfall 2013 dan 2014. Normalization of the river will give good results if the width of the river 5 m and the depth of the river is 3 m.

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