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Jurnal Rekayasa
Published by Universitas Lampung
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Articles 246 Documents
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ANALISIS KEKUATAN GIRDER AKIBAT KEMIRINGAN MEMANJANG JEMBATAN Suyadi Suyadi
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 18, No 1 (2014): Edisi April 2014
Publisher : UNIVERSITAS LAMPUNG

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Abstract

At standards, the maximum slope of the bridge is 5%. Longitudinal slope of the bridge will determine the length of the bridge, more sloping more length. Its became more greater the cost. The reasons that underlie this analysis. The analysis has been performed on three kinds of bridges that T beam bridge, PCI bridge and bridge steel truss girder models Callendar Hamilton. The analysis was performed in the manual method and software SAP 2000. This Analysis focused on the capacity of the cross-sectional of the withstand stresses caused by the load acting on the bridge. The bridge is modeled in some slope ranging from 0% for the comparison, 2.5%; 5%; 7.5% and 10%. To easy analysis, load to be projected in the two direction at sloping bridges. It is seen that more greater of the slope cause axial force on girder bridges is increasing. The analysis considering of the combination of axial load, shear and bending ascpects From the analysis looks at three kinds of bridges, with a slope of up to 10% were still able to support the load of the bridge there. It is necessary to do advance analysis of the bridge’s ability and the other element of bridges that direct contact with the longitudinal girder bridge girders due
ANALISIS KEBUTUHAN PENANGANAN JARINGAN JALAN DI WILAYAH KABUPATEN PRINGSEWU BERBASIS TINGKAT PELAYANAN Anditya Pratiwi
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 18, No 2 (2014): Edisi Agustus 2014
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This study aims to identify patterns of movement in Pringsewu District and analyzing the handling needs of the road network in the Pringsewu District in 2014, 2019, 2024 and 2039 based on VC ratio through 4 stages of transportation modeling using tranplan software. To support this analy- sis, also conducted research about level of service in Pringsewu District based on public percep- tion as road users. The primary data was obtained through a survey of LHR and road user per- ception survey conducted through questionnaires. Secondary obtained through relevant institu- tions. The result of analysis is a pattern of movement in 2014, 2019, 2024 and 2039 is almost the same. For 2024 year, road handling by building the North Ring Road considered to necessary be - cause VC Ratio of some streets ≥ 0.9. Road handling in 2039 by increased capacity through widening of the road. Based on the user's perception, level of road service in Pringsewu District is good enough. Level of road sservice in the Pringsewu District highly influenced by accessibility, mobility, safety and road conditions.
OPTIMIZATION OF RICE FIELD CROPPING PATTERN IN WAY KETIBUNG IRRIGATION AREA AT SOUTH LAMPUNG DISTRICT Wayan Susana
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 18, No 2 (2014): Edisi Agustus 2014
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Land use changing in Way Ketibung Irrigation Area from rice field cropping to rubber and palm oil planting were one of causes to decline rice field production at its irrigation area. The changing of land use were caused by lack of water availability . Therefore, it is necessary efforts to optimize irrigation area in order to increase rice production. Based on cropping schedule which used by Way Ketibung Irrigation Area the farmer had define cropping season, rainy cropping season (rendeng, MT I) and dry cropping season (gadu, MT II). The 1 st class of rainy cropping season was started on 1 st week of September and on 1 st week of Jan- uary to the 1 st class of dry cropping season. Whereas, the 2 nd class of rainy season began on 2 nd week of September and on 2 nd week of January to the 2 nd class of dry season. Cropping pattern which based on its cropping schedule that the farmers have done was not suitable, because only a few one could apply the schedule to crop rice field. It is due to the water availability could not serve the amount of water to its cropping pattern. Field observation and hydrologic analysis using suitable approach methods produced the opti- mized cropping pattern that approximated by reliable discharge has 80 % probability in occurs (Q 80 ) and Net Farm Requirement (NFR). The optimized cropping pattern of Way Ketibung Irriga- tion Area defines the cropping season. The 1 st class of rainy cropping season begins on 2 nd Decem- ber and 2 nd April to 1 st class of dry cropping season. Whereas, The 2 nd class of rainy cropping sea- son begins on 1 st January and 1 st May to 2 st class of dry cropping season. Water balance analysis describe surplus and deficit of water, therefore could be generated cropping pattern rotation as; The rainy cropping season (MT I) : 1 st class begin on 2 nd week of December with 821 hectares (100 %), 2 nd class begin on 1 st week of January with 612 hectares (100 %). The dry cropping season (MT II) : 1 st class begin on 2 nd week of April with 50 % of 821 hectares, 2 nd class begin on 1 st week of May with 50 % of 612 hectares.
STUDI KEBUTUHAN AIR DOMESTIK UNTUK DAERAH PANTAI (STUDI KASUS: KOTA BANDAR LAMPUNG) Gatot Eko Susilo; Ofik Taufik Purwadi; Nurayni Nurayni
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 18, No 3 (2014): Edisi Desember 2014
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This study aims to investigate water domestic demand of people living in coastal area of Bandar Lampung City. The location of the study is in the Sukaraja area, Bumi Waras Sub-district, Bandar Lampung City. Data mining of household water demand is undertaken by using questionnaire to 65 households. It is indicated from the survey that every household averagely consits of 4 persons. Everry person spends about IDR 368 for 103.4 l of water domestic in daily basis. Daily water domestic demand of the people in the are study is quite different from the standard daily water domestic demand percapita. This deviation is due to the differences in the aspect of social and economy between the people in the are study and ordinary people
PENGARUH WAKTU PEMERAMAN TERHADAP DAYA DUKUNG STABILISASI TANAH LEMPUNG LUNAK MENGGUNAKAN TX-300 Muhammad Jafri; Setyanto Setyanto; A Ricky Aprinal
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 18, No 3 (2014): Edisi Desember 2014
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Abstract

Soil is a material that serves as an support for the basis of a constuction, be it construction of buildings, bridges and roads. Each region has different soil characteristics in other regions, there is high and has a bearing capacity of those that are low. To improve the soil characteristics that can lead to low bearing capacity, the necessary repairs to soil stabilization methods. Stabilization efforts are often undertaken by stabilizing additives. In this research using a chemical additive material that is TX-300, which is expected to improve the characteristics of the soil so the soil is worthy of a construction established. Soil samples that tested in this research is the soft clay are derived from Rawa Sragi, East Lampung. This study used soil mixed with ash content about 0,9 ml with the optimum variation of curing time used is 7 days, 14 days and 28 days. Based on the test of physical properties of original soil, AASHTO classifies soil samples in group A-7 (clay soil) and subgroup A-7-5, while the USCS classifies soil samples as fine-grained soil and belonging to CH group. The results of laboratory studies indicate that the stabilization material using TX-300 can improve the physical and mechanical properties of soft clay. The soil that has been stabilized with TX 300 has increased the value of specific gravity and bearing capacity and it is decreased of liquid limit and indeks plastisity of soft clay. Based on the test results, this type of clay is not too good to be used as a ground subgrade for road construction, because its PI’s value is about ≥ 10% despite value of CBR is plenty high.
Sampul Muka Jurnal Rekayasa Edisi April 2015 Ahmad Zakaria
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 19, No 1 (2015): Edisi April 2015
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Sampul Muka Jurnal Rekayasa Edisi April 2015
PEMODELAN PERIODIK DAN STOKASTIK UNTUK MENGANALISIS DATA CURAH HUJAN YANG HILANG MENGGUNAKAN STUDI KASUS STASIUN HUJAN SUKARAME Ashruri Ashruri
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 19, No 1 (2015): Edisi April 2015
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Abstract

Rainfall data is very important for planning in engineering, especially for hydrology buildings such as water irrigation, dams, urban drainage, ports, docks, etc. Rainfall has periodic and sto - chastic parts, and influenced by climatic parameters such as temperature, wind direction, humid- ity, etc. These parameters are transferred into the periodic and stochastic rainfall components. The rainfall is calculated to determine both, periodic and stochastic components. The missing data were caused by the malfunction of operation of the recording in the rain stations or human error itself.
Sampul muka Jurnal Rekayasa Edisi Agustus 2015 Zakaria, Ahmad
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 19, No 2 (2015): Edisi Agustus 2015
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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.
PENGARUH KUAT TEKAN DAN KUAT GESER SAMPEL DRYSIDE OF OPTIMUM (KERING OPTIMUM) DAN WETSIDE OF OPTIMUM (BASAH OPTIMUM) PADA TANAH LEMPUNG Lumeilia Afriani; Iswan Iswan; Armen Febri
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 19, No 3 (2015): Edisi Desember 2015
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Abstract

Clay is a type of soil with low bearing capacity, the water is very large influence on the physical and mechanical behavior. Clay in the dry state optimum swell properties that are larger than the current optimum wet clay compacted. This is because at the time of clay in the dry state of opti - mum relative shortage of water so that the clay has a greater ability to absorb water. In experi - ments clay in dry conditions and wet optimum optimum useful to know the carrying capacity of the soil in dry and wet conditions. From the results of research conducted generate free compressive strength value (qu) and the value of cohesion (c) and the maximum shear strength soil in wet conditions the optimum moisture content, dry optimum and optimum. In optimum conditions produce the highest value for the com- pressive strength of free, direct shear strength and cohesion values. This is because the optimum conditions the maximum soil density, so that the soil is not easily mengemang. In dry conditions the optimum clay soil density unstable, so that the grains of soil are not mutually binding, whereas in wet conditions the optimum pressure on the grains of soil is very high, so that the soil has a high plasticity.

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