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MENGHITUNG MANFAAT EKONOMI PEMBANGUNAN INFRASTRUKTUR TRANSPORTASI Purba, Aleksander
Jurnal Rekayasa Vol 16, No 3 (2012): Edisi Desember 2012
Publisher : UNIVERSITAS LAMPUNG

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Economic growth and available of infrastructures supply are requirement to fulfill demand ofpassengers and goods movement. In other hand, the restrictions of available budget could beobstacle to implement due to city’s limited budget that should financed other sectors such ashealthy, education, running water, garbage etc.City’s of Bandar Lampung try on searching secondary finance as an alternative source throughPusat Investasi Pemerintah (PIP), a special institution of Financial Ministry, reserve fundedconstruction of few project which consist of two flyovers and widening of seven main roads acrossthe city.Off course, it’s rightfully if public and taxpayers want to find out what are the benefit of thoseproject and how substantial would be influence for Bandar Lampung. Does a loan would becommensurable to obtained long term benefit? Research aims to enumerative the economicbenefit of construction of transport infrastructure, that’s as a whole will be fully complete danoperate. Meanwhile the widening section of seven main roads had completely a head. The resultshows that’s economic benefits of these project, direct and indirect, is bigger than wholesaleinvestment.
SUMIDA, PENGALAMAN TATAKELOLA SUNGAI YANG MENGINSPIRASI Murtedjo, Tedy; Purba, Aleksander
Jurnal Rekayasa Vol 16, No 3 (2012): Edisi Desember 2012
Publisher : UNIVERSITAS LAMPUNG

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The Sumida River (Sumida-gawa) is a river which flows through Tokyo Japan. It branches fromthe Arakawa River at Iwabuchi and flows into Tokyo Bay. Its tributaries include the Kanda andShakujii rivers. What is now known as the "Sumida River" was previously the path of theArakawa, however towards the end of the Meiji era work was carried out to divert the main flowof the Arakawa to prevent flooding. It passes through the following seven wards of Tokyo.
INOVASI SISTEM PENYANGGAAN DI TAMBANG BAWAH TANAH DMLZ PT.FREEPORT INDONESIA Ginting, Arjuna; Purba, Aleksander; Sjadat, Anwar
Simposium II UNIID 2017 Vol 2 (2017)
Publisher : Simposium II UNIID 2017

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Sistem penyanggaan adalah salah satu aspek yang tidak bisa dipisahkan dalam sebuah perencanaan penambangan dengan metode tambang bawah tanah, kesuksesan dan kegagalan dalam menentukan sistem penyanggaan menjadi hal yang sangat kritikal dan penting, karena kegagalan dalam hal ini dapat menyebabkan resiko terhadap keselamatan bagi para pekerja serta terganggunya aktifitas produksi. PT.Freeport Indonesia mempunyai beberapa area tambang bawah tanah, dua area tambang bawah tanah yang saat ini pada tahap produksi yaitu Deep Ore Zone (DOZ) dan Biggosan, serta dua area yang pada tahap proses development dengan menggunakan metode block caving yaitu Deep Mill Level Zone (DMLZ) dan Grasberg Block Caving (GBC). Area tambang DMLZ terletak dikedalam 1500-1600m dari permukaan dan terletak dibawah tiga area tambang bawah tanah sebelumnya (Gunung Biji Timur, Intermediet Ore Zone , dan Deep Ore Zone), letaknya yang jauh dari permukaan menjadikan DMLZ berada pada kondisi tegangan yang cukup tinggi (high stress). Inovasi sistem penyanggaan terus dilakukan khususnya sistem penyanggaan yang dipasang di area tambang bawah tanah DMLZ, sebagai salah satu komitment perusahaan terhadap keselamatan dalam pencapaian produksi yang aman serta optimal dikemudian hari. Tulisan ini menjelaskan dan menyebutkan sistem penyanggaan di tambang bawah tanah DMLZ. Sistem penyanggaan yang digunakan sejak pertama metode tambang bawah tanah yang telah dibuka sampai saat ini telah banyak mengalami perubahan, dari sistem pemasangan secara manual atau konvensional serta jenis penyanggaan yang digunakan sesuai dengan kondisi pada tekanan yang tinggi dan berpotensi terjadinya strainburst atau rockburst seperti kondisi saat ini.
Analisis Ekonomi dan Finansial pada Proyek Kereta Cepat Jakarta - Bandung Widyasti, Rinanda Putri; Purba, Aleksander; Karami, Muhammad
Jurnal Rekayasa Sipil dan Desain Vol 6, No 4 (2018): Edisi Desember 2018
Publisher : Jurnal Rekayasa Sipil dan Desain

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  This study aims to analyze the economic and financial viability of the Jakarta - Bandung high-speed railway using three scenarios, the best scenario, the medium scenario, and the worst scenario. Where the three scenarios are using 75% load factor with discount factor level of 2% and 3,46%. A project is considered feasible by comparing feasibility parameters, such as NPV, BCR, PI, EIRR / FIRR, and payback period. Based on the results obtained on the feasibility parameters used, showing the economic and financial feasibility analysis with the discount rate of 2% and 3,46% in the best, medium and worst scenario, the project is declared eligible to be built, due to the eligibility of economic feasibility.  Keywords:High-speed, economic feasibility, financial feasibility, feasibility parameters 
Studi Efektivitas Ruang Henti Khusus (RHK) Sepeda Motor Pada Simpang Bersinyal Nainggolan, Jesicha; Purba, Aleksander; Sulistyorini, Rahayu
Jurnal Rekayasa Sipil dan Desain Vol 6, No 3 (2018): Edisi September 2018
Publisher : Jurnal Rekayasa Sipil dan Desain

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The increasing number of motorcycle vehicles, causing traffic congestion at the signal intersection in Bandar Lampung City. As an effort in reducing congestion, the government of Bandar Lampung city made Special Stopping Space (RHK) for motorcycles. The RHK is a space dedicated to arrange motorcycle queue place when stop at the signalized intersection during traffic light period. This study aims to examine the effectiveness of RHK at the signalized intersection, and it’s impact on saturation current increase and approach capacity compared to approach without RHK. The effectiveness and impact of RHK, was conducted by surveying traffic flow in the morning during peak hours using camera video in each selected approaches. The survey data obtained were analyzed using MKJI and compared with previous research. RHK increases saturation flow 7,3% - 17,5% and approach capacity 37,67% - 52,09%. In conclusion RHK is effective to be provided in signal intersection. Value of RHK filling level at Jl. P. Diponegoro - Jl. P. Diponegoro and Jl. Jend. Sudirman - Jl. Gajah Mada - Jl. Jend. Sudirman is less than 50% that indicates bad while at Jl. Jend. Sudirman - Jl. Jend. Sudirman and Jl. Dr. Susilo - Jl. P. Diponegoro is 50% - 80% that indicates moderate.  Keyword : RHK (SSSM : Special Stopping Space for Motorcycle), signal intersection, effectiveness of RHK, saturation current, capacity of the approach
Analisis Ekonomi dan Finansial Shortcut Tegineneng - Tarahan Siagian, Andre Jonathan; Purba, Aleksander; Siregar, Amril Maruf
Jurnal Rekayasa Sipil dan Desain Vol 6, No 3 (2018): Edisi September 2018
Publisher : Jurnal Rekayasa Sipil dan Desain

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Feasibility Analysis is an appropriate analysis of parameters to determine a successful implemented project or not. Feasibility analysis is divided into two parts economic and financial analysis that both affect the feasibility of a project. The purpose of this study is to determine the costs incurred in a railway shortcut project, to analyze delay times before and after a railway shortcut, and to find out which railway shortcut project meets the economic and financial feasibility requirements. In this study, an analysis of the economic and financial feasibility and summarize the economic viability benefits of the Tegineneng - Tarahan shortcut project was conduct. A project is declared feasible or not by doing comparison with the feasibility method that is NPV> 0, BCR> 1, PP faster than the specified time, IRR> capital cost, and PI> 1. This study uses full occupancy rate with discount rate of 5% , 10%, and 15%, respectively.Based on the results obtained in terms of economic feasibility analysis that investment evaluation does not qualify due to the amount of benefit is too small so that economic analysis is not feasible. The aspect of financial feasibility analysis and analysis by summing the two financial and economic benefits is eligible so that the Tegineneng - Tarahan shortcut project is categorized as feasible. Keyword : Economic Feasibility, Financial Feasibility, Feasibility Method
Kajian Dampak Proses Angkutan Terhadap Segregasi Pada Campuran Aspal Panas Alfarido, Atreyu; Putra, Sasana; Purba, Aleksander
Jurnal Rekayasa Sipil dan Desain Vol 6, No 3 (2018): Edisi September 2018
Publisher : Jurnal Rekayasa Sipil dan Desain

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One of the causes of construction failure on asphalt pavement is segregation. Which  is the separation of small and large aggregate grains within a mixture, so that in a part of the coating of the pavement will be concentrated aggregate coarse and in other part will be concentrated fine aggregate. One of the factors causing segregation is the hauling distance from Asphalt Mixing Plant to the slap location. To understand this, task a study on the impact of the transport process on segregation on hot asphalt mixture from Asphalt Mixing Plant to the location of the spread. The mixture used is the Asphalt Concrete-Wearing Course type or the laston coated wear of Asphalt Mixing Plant PT. Gigging Polah Raya for work location which is 28.9 km on Jalan Sultan Agung, Bandar Lampung, Lampung and PT. Rindang Tigasatu Pratama for work location located 53.3 km on Jalan Teuku Cik Ditiro, Bandar Lampung, Lampung. Examination of sample is done trough extraction test and sieve analysis test. From the result of the research, it’s found that there is being segregation during the transport of asphalt mix mixture from Asphalt Mixing Plant to the slap location. For sample PT. Manggung Polah Raya, gradation aggregate is still within the upper and lower limits of the general specification Bina Marga 2010. As for the sample of PT. Rindang Tigasatu Pratama, the aggregate gradation is out of the upper and lower limits of the general specification of Bina Marga 2010. Factors affecting segregation are haulage distances and aggregate density. Keywords: Road Pavement, Asphalt Concrete, Segregation.
Evaluasi Kapasitas Parkir Unila Berdasarkan Kebutuhan Satuan Ruang Parkir (SRP) Tri Pambudi, Hariadi; Junaedi, Tasan; Purba, Aleksander
Jurnal Rekayasa Sipil dan Desain Vol 6, No 1 (2018): Edisi Maret 2018
Publisher : Jurnal Rekayasa Sipil dan Desain

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Universitas Lampung adalah universitas negeri pertama di propinsi Lampung dan termasuk universitas favorit di Indonesia; jumlah mahasiswa cenderung naik setiap tahunnya. Kenaikan jumlah mahasiswa berpengaruh kepada kenaikan jumlah pengguna kendaraan bermotor yang berimplikasi naiknya kebutuhan petak parkir. Parkir terpadu merupakan sebuah kebijakan jangka panjang Universitas Lampung untuk menata perparkiran menjadi lebih tertib dan teratur.Penelitian ini dilakukan untuk mengetahui persentase pengguna kendaraan bermotor/transportasi umum, karakteristik parkir dan perbandingan perhitungan kebutuhan petak parkir penelitian dengan siteplan parkir terpadu Universitas Lampung. Data primer digunakan untuk menghitung persentase pengguna kendaraan bermotor dan karakteristik parkir diperoleh dengan membagikan 990 lembar kuisioner. Sedangkan kebutuhan petak parkir diperoleh dari data sekunder, yakni jumlah mahasiswa serta tenaga pendidik dan tenaga kependidikan Universitas Lampung tahun 2013-2016.Dari hasil perhitungan diperoleh persentase pengguna kendaraan sebesar 15% mobil, 65% motor dan 20% angkutan umum/sepeda/jalan kaki. Selanjutnya kebutuhan Satuan Ruang Parkir untuk mobil 279 petak dan motor 1256 petak. Perbandingan kebutuhan petak parkir antara perhitungan dan siteplan parkir terpadu Universitas Lampung sebesar 897 petak mobil dan 1550 petak motormaka tidak perlu dilakukan penambahan petak parkir rencana. Analisis karakteristik parkir diperoleh nilai indeks parkir maksimum mobil 61,08% dan motor 97,79%.
Potensi Bangkitan Perjalanan Berbasis Guna Lahan Sekolah Putra, Rahmad Syah; Putra, Sasana; Purba, Aleksander
Jurnal Rekayasa Sipil dan Desain Vol 6, No 4 (2018): Edisi Desember 2018
Publisher : Jurnal Rekayasa Sipil dan Desain

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AbstractCitizen growth will cause the increasing of amount trip due to fullfil the needs. School is a place that students go to, to get the education. Those activities can cause human movements and further can cause traffic jam if there are no proper configurations. The main aim of this study is to know the potential trip generation that caused by high schools in Bandar Lampung, to analize factor that affected by student movements and make the trip generation that caused by school’s function in Bandar Lampung. The main aim of this study is to know the potential trip generation that caused by high schools in Bandar Lampung, to analize factor that affected by student movements and make the trip generation that caused by school’s function in Bandar Lampung.The data were drawn from the responses of quesionaire that given to students of 4 high schools in bandar lampung and itsrelationship between transportation modes, vehicles ownership and pocket money. The data analysis is using category analysis and comparison descriptive. Trip generation from the category analysis counts from kepemilikan kendaraan, pemilihan moda dan besaran uang saku as one of factor that affected. The results of the category analysis obtained the total movement of students from the four schools that have been studied is 1259 movementsKeywords: high school students, trip generation, category analysis. AbstrakPertumbuhan penduduk akan mengakibatkan meningkatnya jumlah perjalanan guna memenuhi berbagai kebutuhan. Sekolah merupakan tempat tujuan aktivitas pelajar untuk memenuhi kebutuhan pendidikan. Aktivitas tersebut dapat menyebabkan perpindahan manusia dalam satu waktu dan kemudian hari dapat menimbulkan masalah seperti kemacetan apabila tidak dilakukan pengaturan. Tujuan penelitian ini adalah untuk mengetahui potensi bangkitan dan tarikan perjalanan yang ditimbulkan dari dan oleh sekolah menengah atas di Bandar Lampung, menganalisis faktor yang mempengaruhi pergerakan pelajar dan membuat model bangkitan yang diakibatkan fungsi sekolah di Bandar Lampung. Pengambilan data dilakuan dengan pembagian kuesioer kepada pelajar di empat sekolah yang telah ditentukan. Pertanyaan-pertanyaan yang diajukan mengenai asal tujuan perjalanan, moda transportasi, kepemilikan kendaraan serta uang saku. Kemudian dilakukan analisis data yaitu analisis kategori dan desktiptif komparatif Model bangkitan yang diperoleh dari hasil analisis kategori dihitung dengan kepemilikan kendaraan, pemilihan moda, dan besaran uang saku sebagai faktor yang mempengaruhinya. Hasil dari analisi kategori didapatkan pergerakan total pelajar dari keempat sekolah yang telah diteliti adalah sebesar 1259 pergerakan. Kata kunci : pelajar SMA, model bangkitan, analisa kategori.
Analisis Ekonomi dan Finansial Kereta Cepat Jakarta - Bandung Giantara, Oldebes Temy; Purba, Aleksander; Herianto, Dwi
Jurnal Rekayasa Sipil dan Desain Vol 6, No 4 (2018): Edisi Desember 2018
Publisher : Jurnal Rekayasa Sipil dan Desain

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Jakarta and Bandung city with a distance about 150 km must be taken more than three hours by highway or railway due to the ever-increasing mobility with limited infrastructure capacity.  This study analyzes the economic and financial feasibility of the Jakarta – Bandung high speed rail project and calculates the NPV, BCR, IRR, PI, and PP. The government through the SOE and China International Railway consortium initiated the construction of a high speed rail from Halim to Tegalluar with a 142,3 km rail length and an average speed of 250 km/h, construction began in 2015 and is expected to be completed by 2020. The analysis is done with assumption of 75% occupancy rate, with discount rate of 2% and 3,46%, and feasibility of the project by doing comparison of feasibility method that is NPV ≥ 0, BCR > 1, IRR > r, PI > 1, and PP is faster than NPV positive. In the highest value feasibility analysis obtained with 75% occupancy rate and discount rate 2%. If only calculate the economic benefits obtained value of NPV = 3.279.703.704,18 ≥ 0, BCR = 1,00 > 1, IRR = 6,45% > r, PI = 0,65 < 1, PP = 33,76 > 29 year. If only calculate the financial benefits obtained value of NPV = 8.677.268.827,83 ≥ 0, BCR = 1,01 > 1, IRR = 5,50% > r, PI = 0,79 < 1, PP = 34,47 < 38 year. If calculate the economic and financial benefits obtained value of NPV = 1.543.396.683.112,40 ≥ 0, BCR = 1,56 > 1, IRR = 105,46% > r, PI and PP can not be calculated because the positive value of NPV in the first year (2020).