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Jurnal Rekayasa
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Articles 8 Documents
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Search results for , issue "Vol 19, No 2 (2015): Edisi Agustus 2015" : 8 Documents clear
Sampul muka Jurnal Rekayasa Edisi Agustus 2015 Zakaria, Ahmad
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 19, No 2 (2015): Edisi Agustus 2015
Publisher : UNIVERSITAS LAMPUNG

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Sampul muka Jurnal Rekayasa Edisi Agustus 2015
PENGARUH AGREGAT KASAR BERGRADASI CELAH TERHADAP KUAT TEKAN BETON Irianti, Laksmi; Sebayang, Surya; Wibowo, Rivan Adlia
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 19, No 2 (2015): Edisi Agustus 2015
Publisher : UNIVERSITAS LAMPUNG

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The development of construction and transportation industrial shows significant increase together with the increases of people and the needs. Part of construction which increases significantly is concrete. In concrete making, aggregate gradation affects concrete strength a lot. Aggregate gra- dation can be categorized in 3 kinds that is continuous graded, uniform graded, and gap graded. The purpose of this research is to compare concrete pressure strength of gap graded aggregate and continuous graded aggregate. The research was done by making cylinder samples (d=150 mm, t=300 mm) with concrete pres- sure strength 17,5 MPa, 27,5 MPa and 37,5 MPa. Course aggregate variations which was used were 2 – 3,75, cm, 1 – 2 cm and 0,5 – 1 cm , 2 – 3,75 cm. The treatment of samples was done by drowning it into water and blowing it for 7 days. The samples were tested in 28 days. The result of the test was: (1) average concrete pressure strength with gap graded course aggre- gate was lower than concrete which used continuous graded course aggregate, (2) In concrete mixture with pressure strength 17,5 MPa, maximum load which can be hold by concrete with gap graded course aggregate was not so different from concrete with continuous graded course aggre- gate, (3) The higher pressure strength which was planned, the lower maximum load which can be hold by concrete with gap graded course aggregate, (4) There are differences between elasticity modulus values from this research and elasticity modulus from empirical formulas prediction in ACI 318-83M and Hognestad.
Daftar Isi Jurnal Rekayasa Edisi Agustus 2015 Ahmad Zakaria
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 19, No 2 (2015): Edisi Agustus 2015
Publisher : UNIVERSITAS LAMPUNG

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Daftar Isi Jurnal Rekayasa Edisi Agustus 2015
Cover Belakang Jurnal Rekayasa Edisi Agustus 2015 Ahmad Zakaria
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 19, No 2 (2015): Edisi Agustus 2015
Publisher : UNIVERSITAS LAMPUNG

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Cover Belakang Jurnal Rekayasa Edisi Agustus 2015
Model Stokastik Curah Hujan Harian dari Beberapa Stasiun Curah Hujan di Way Jepara Ahmad Zakaria; Margaretta Welly; Mirnanda Cambodia
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 19, No 2 (2015): Edisi Agustus 2015
Publisher : UNIVERSITAS LAMPUNG

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This research was conducted to study and know the characteristics of periodic and stochastic models of daily rainfall in the Way Jepara. This study used secondary data, namely daily rainfall data with a data length of 13 years (1997-2013) from the station Braja Arjosari, Braja Indah, and Jepara Lama. In this study , daily rainfall data is processed into the form of time series before it was trans- formed into the spectrum of rainfall using the program FFT (Fast Fourier Transform). One year of daily rainfall data periodicity, only used 512 rainfall data are periodic. Spectrum rainfall pro- duce data series stochastic rainfall is assumed as the difference (error) between the actual rainfall data with periodic rainfall models. Based on data from the series of stochastic, the stochastic com- ponent is calculated using the approach of autoregressive models. Stochastic model generated us- ing the least squares method (least square method) or autoregressive model of order three. Vali- dation of stochastic series between the measured data and the model is done by calculating the correlation coefficient. From the research, the correlation coefficient obtained an average of three stations of the daily rainfall. Value of the average correlation coefficient ( R ) between the data with a model pe- riodic rainfall amounted to 0.97305, the data series is stochastic and stochastic models of 0.99150, and between data and periodic stochastic models are at 0.99963. From the results, it can be concluded that the periodic stochastic models of rainfall Way Jepara region gives very accurate results and the approach significantly.
Studi Kekuatan Batu Bata Pasca Pembakaran Dengan Menggunakan Bahan Additive Serbuk Gergaji Kayu Setyanto Setyanto; Iswan Iswan; Hari Diantoro Rahmad
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 19, No 2 (2015): Edisi Agustus 2015
Publisher : UNIVERSITAS LAMPUNG

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The Increasing construction in Indonesia and the number of population which is increasing every year must be supported by better economy growth. Thus, the construction materials will continue to increase to support the needs of infrastructure construction. To support the development and growth, then brick as a construction material will be needed. One of the method that can be used to improve the quality of the soil material is to use mixing ingredients (additives) such as sawdust to facilitate the combustion process and as a pore-forming on bricks. Based on the explanation above , it is necessary to do an objective study of making bricks, so that sawdust can be used as an right mix alternative in the manufacture of bricks, in the hope of sawdust waste is not wasted, but it can add power to brick and can produce bricks with good quality. Soil samples were tested in this study is a fine-grained soil from the Yosomulyo village, East Metro District, Metro City. Variations in the levels of the mixture used is 5%, 10%, 15% and 20%, with a curing time of 14 days as well with post-combustion treatment on the brick. Based on the results of physical testing of the original soil, USCS classified the soil samples as fine-grained soil and included in the ML group. This study used additive materials, such as wood sawdust mixture, on the mixture of 5% level, red brick experienced an escalation compared to bricks that are not mixed with additive materials. At the levels of a mixture of 10%, 15% and 20%, bricks decreased, both in terms of compressive strength and quality of bricks. So, in a mixture of 10%, 15% and 20%, the brick is not recommended for use as a building material because it does not fit to the requirements of SNI 15- 2094-2000 and water absorption rate is only 15% the level of compliance with the standards between 14% to with 18%.
ANALISIS PENCARIAN DATA CURAH HUJAN YANG HILANG DENGAN MODEL PERIODIK STOKASTIK (STUDI KASUS WILAYAH KABUPATEN PRINGSEWU) Ikromi Fahmi
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 19, No 2 (2015): Edisi Agustus 2015
Publisher : UNIVERSITAS LAMPUNG

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This study was aimed to calculate and predict the missing rainfall rate data by comparing the ac- tual data and the calculation. This study used daily rainfall rate data from 1990 to 2000 at three stations, namely Fajar Esuk, Panutan and Podorejo in Kabupaten Pringsewu. Data analysis were conducted using reciprocal method and periodic stochastic model. The recip- rocal method was calculated by using the daily rainfall rate data and the closest distance between two stations and the research object. Meanwhile, the periodic stochastic model was calculated by using the daily rainfall rate data for 512 days all year long. Then, the periodic model of the daily rainfall rate was established by using Fourier equation and least squares method. The stochastic components were calculated by autoregressive approaching model. The stochastic model was pre- sented by third order of autoregressive model. The comparison between data and calculation was conducted by using correlation coefficient. Based on this study, it was concluded that calculation of missing rainfall rate was very signifi- cantly closer to the measured rainfall rate. The correlation coefficient of the synthetic method for daily time series, the monthly average rainfall, and the cumulative rainfall rate were 0,9999; 0,9999; and 0,9991 respectively.
Analisis Konstruksi Jembatan Busur Rangka Baja Tipe A-half Through Arch Bayzoni Bayzoni; Eddy Purwanto; Yumna Cici Olyvia
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 19, No 2 (2015): Edisi Agustus 2015
Publisher : UNIVERSITAS LAMPUNG

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Indonesia is an archipelago and has an important role connecting bridges between islands . The need for long -span bridges and lightweight materials and consist artistic value , then the arc steel truss bridge is an alternative of the problem. In this research will focus on the type a half through arc.The bridge is design to 120 m,span and 12 m,height with a transverse dimension of the vehi- cle floor complete with sidewalk is 11 m to 2 lanes 2 -way with pavement width of 1 m . Loading calculations used in the planning of the bridge is based on the regulation BMS 1992 and RSNI T - 02-2005 and calculation of the power structure refers to RSNI T - 03-2005 and SNI 03-1729-2002. The results of the study are obtained composite vehicle floor plates , with a reinforced concrete slab thickness of 250 mm . Transverse girder and longitudinal girder using iwf.900.300.28.16 iwf.400.200.13.8 with BJ 55. The connection between the ransverse girder and longitudinal girder using bolts with A325 quality with a diameter of 25 mm with 10 mm thick plate BJ 34. The main structure of the arc in the form iwf.400.400 .21.13 . The main structure connection using bolts with A325 quality with a diameter of 35 mm with 25 mm thick plate BJ 50 .

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