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INDONESIA
Jurnal Rekayasa
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Articles 246 Documents
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ARSITEKTUR TRADISIONAL KENALI SALAH SATU KEARIFAN LOKAL DAERAH LAMPUNG William Ibrahim
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 15, No 1 (2011): Edisi April Tahun 2011
Publisher : UNIVERSITAS LAMPUNG

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Abstract

Arsitektur tradisonal Kenali merupakan ‘indigeneous knowledge’ yang menjadi salah satu kekayaan khasanah arsitektural di Indonesia. Adaptif bangunan terhadap lingkungan sekitarnya merupakan gambaran kebijakan nenek moyang dalam mensiasati dan tanggap terhadap kondisikehidup lingkungannya. Sistem struktur rumah tradisional Kenali yang terefleksi dari filosofi bentuk dan fungsi bangunannya. Selain itu juga sistem struktur rumah tradisional Kenali sangat tanggap terhadap kondisi alam yang sering terjadi, seperti gempa dll. Pemilihan konstruksi yang tepat untuk mensiasati hubungan antara sistem struktur atas dan struktur bawah menjadi gambaran kearifan lokal yang dapat dikembangkan pada kehidupan modern. Sistem tumpuan yang bersifat sendi atau rol, sistem sambungan purus dan pen, konfigurasi balok-balok lantai yang saling jepit, tumpu, tekan, dan tarik dipandang sebagai kesatuan sistem earthquake responsive building.
ANALISA KARAKTERISTIK CURAH HUJAN DAN KURVA INTENSITAS DURASI FREKUENSI (IDF) DI PROPINSI LAMPUNG Susilowati A; Dyah Indriana Kusumastuti
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 14, No 1 (2010): Edisi April Tahun 2010
Publisher : UNIVERSITAS LAMPUNG

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Abstract

This research was done to analyze the characteristic of rainfall that agreed with the short termduration of rainfall data at BMG Maritim Lampung station, BMG Raden Inten II Bandar Lampungstation, Masgar Tegineneng Climatology station and Kotabumi Geophysical station. From theresults of research will be made intensity duration frequency (IDF) curve based on: (1) Analysis offrequency rain distribution of short term rainfall data from each stations. (2) Analysis of rainfallintensity for every rain duration in particular when reuses Van breen intensity method and Hasperder weduwen intensity method then doing calculate approach of rainfall intensity using leastsquare are Talbot, Sherman and Ishiguro formula’s, it means to determine the equality of rainfallintensity to program region. From the result of research could be summarized as follows ;(1) Thedata of rainfall used is short term rainfall data (5, 10, 15, 30, 45, 60, 120 minutes, 3 hours, 6hours and 12 hours) and as annual maximum series, (2) Type of distribution that appropriate withall observation station is Log Pearson Type III Distribution, (3) The rainfall intensity of VanBreen method used Talbot equality, it is used as reference to form IDF curve. The intensityequality was valid only to data of rain in all observation year at every station. (4) The IDF Curveshowed that high rainfall intensity ran in short duration (5) the IDF curve can be used fordetermine planning flood by using rational method.
ANALISIS KASUS SEDIMENTASI DI TIGA TITIK KAWASAN WATER FRONT CITY Yuda Romdania
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 14, No 1 (2010): Edisi April Tahun 2010
Publisher : UNIVERSITAS LAMPUNG

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Abstract

Prediction of sediment transport along the coast for various conditions is very important to knowin order to know the amount of sediment transport and examine the influences that tend toprovoke. Existence of the buildings on the coast will cause sedimentation in one hand and on theother side causing erosion. Bandar Lampung is city with a coastal region, is currently designing ajob that is Water Front City (beach city) which is designed in an effort to carry out vision andmission of Bandar Lampung City which is "Making the city of Bandar Lampung become civilized,comfortable and sustainable." The existence of this work it is necessary to design a sedimentationanalysis in order to know the amount of the resulting sediment transport and the influences whichtend to be caused due to designing Water Front City. Data collection is performed at three pointsthen inserted to CERC Equation which get a conclusion of sediment movement from two pointsconical at one point which is toward the Panjang Port, resulting a large pile of sediment aroundPanjang Port area.
APLIKASI MODEL HIDROGRAF SATUAN SINTETIS US SCS DALAM UPAYA OPTIMASI TATA GUNA LAHAN DAERAH ALIRAN SUNGAI MEMPAWAH KALIMANTAN BARAT Wibowo, Hari
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 14, No 1 (2010): Edisi April Tahun 2010
Publisher : UNIVERSITAS LAMPUNG

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Abstract

River discharge can be used as an indicator whether the catchment has an impact on the process control, especially in hydrology point of view. Beside, from that output the condition of the catchment can be evaluated. Information of river discharge will be more beneficial when it is presented as a hydrograph.Using synthetic unit hydrograph model, optimation of land use for catchment management planning can be computed. Optimal land use based on synthetic unit hydrograph model will support water resources conservation in Mempawah catchment. From the model result it is obtained that the largest land use in Mempawah catchment is for dry land with bush farming 64.4%, secondary swamp forest 12.8%, dry land farming 6.6%, swamp with bush 5.3%, secondary dry land forest 5.2%, bush 4.6%, open land 0.5%, settlement 0.4%, and embankment 0.2%. Average river discharge at the upstream is 17.54 m3/s, at the middle 59.05 m3/s and at the downstream 126.03 m3/s. At the current condition flood discharge (Qp) is 3,687.7323 cfs, time to peak (Tp) 81.2275 hours and base time 406.1376 hours. If the forest condition is worse then flood discharge becomes 1993.8815 cfs with Tp 150.2322 hours and Tb 406.1376 hours. For better forest condition flood discharge is 1559.7734 cfs, Tp 192.0441 hours and Tb 960.2207 hours. For good forest condition Qp is 1098.1439 cfs, Tp 272.7742 hours and Tb 1,363.8711 hours.
KAPASITAS ULTIMIT DAN KAPASITAS GESER BALOK BETON BERTULANG MUTU TINGGI BERAGREGAT BATU PUTIH Laksmi Irianti
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 14, No 1 (2010): Edisi April Tahun 2010
Publisher : UNIVERSITAS LAMPUNG

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Abstract

Limitation of concrete constituent’s reserve, especially coarse aggregate cause need coarseaggregate taken from others region, so that it will increase price and economy value the coarseaggregate. Therefore, several researches are done to get a cheap building material but satisfyrequirements. Purposes of the research are to know flexural strength and shear strength of highstrength reinforced concrete beam that uses white stone with compression strength of 50 Mpa.White stones are taken from hill around Bandar Lampung used to replace coarse aggregate arecommonly used as concrete coarse aggregate in concrete. Sample of the research consist of threecylinders concrete (d = 150 mm and h = 300 mm) for compressive strength test concrete, 3concrete beams (b = 100 mm, h = 100 mm and L = 300 mm) for concrete flexural strength test 3beams double L for shear strength test concrete, 3 reinforced concrete beams (b = 120 mm, h =185 mm and l = 1350 mm) for beam bent strong test and 3 reinforced concrete beams (b = 120mm, h = 200 mm and L = 800 mm) for shear strength test beam. This watchfulness test thingconsists of: 3 concrete cylinders (d = 150 mm and h = 300 mm) for compressive strength testconcrete, 3 concrete beams (b = 100 mm, h = 100 mm and l = 300 mm) for concrete flexuralstrength test, 3 beams double L for shear strength test concrete, 3 reinforced concrete beams (b= 120 mm, h = 185 mm and l = 1350 mm) for beam bent strong test and 3 reinforced concretebeams (b = 120 mm, h = 200 mm and l = 800 mm) for shear strength test beam. From beamflexural testing result that have been done, that white stone use as concrete aggregate in Highstrength reinforced concrete beam gave ultimate capacity of 12,375.106 Nmm or 4,3603 % higherthan nominal ultimate capacity (beam nominal capacity). Therefore, white stone can be used asconcrete coarse aggregate in reinforced concrete beam element. From shear testing result hasbeen done, it can be seen that shear strength obtain from testing are slightly different from shearstrength predictions referrer to SK SNI T-15-1991-03, ACI 318-83 M and zsutty equation; thedifferences are only 0,7 % - 28,9 %. Therefore, white stone can be used as concrete coarseaggregate in reinforced concrete beam structure element.
KEKUATAN SAMBUNGAN TEGAK (BUTT JOINT) STRUKTUR BALOK LAMINASI (GLULAM BEAMS) DARI KAYU LOKAL Ratna Widyawati
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 14, No 1 (2010): Edisi April Tahun 2010
Publisher : UNIVERSITAS LAMPUNG

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Abstract

In a line with technology growth in wood working and manufacturing, the require of raw materialwoodhighly increase. That’s why the efforts for raising the efficient of wood as one ofconstruction materials is needed. One of the alternatives is using low quality wood of fast growingwood with laminating technology. This study purposed to find out the optimum strength of scarfjoint using resin Urea Formaldehyde and the influence of kemiri (Aleurites moluccana willd)glulam beam towards the strength. The specimen of glulam beam has size of 75 mm in width, 125mm in thickness, and 2500 mm in length, with two variation of butt joint placement. Threespeciments are used in each variation of butt joint placement. Slices of Kemiri wood are laminatedusing Urea Formaldehyde (UA-104) glue with the thickness of 40/MDGL. The test is carried outby giving lateral static load on the specimen gradually until the crack of the specimen. The testindicates that the variation of butt joint placement has no effect to its strength. The averagemaximum strength of glulam beam BLK 1 is 1570,24 kg; BLK 2 is 1498,78 kg; while for BLKS 3is 1332,21 kg. If compared to the strength of solid beams of Kemiri wood that is 1093,94 kg,glulam beam has more strength of 34,11 %. The crack of glulam beams in the tests is started onthe stress area. The crack is continued on the strain area and followed by the fracture in thebottom of the wood.
PENGARUH KADAR ABU TERBANG SEBAGAI PENGGANTI SEJUMLAH SEMEN PADA BETON ALIR MUTU TINGGI Surya Sebayang
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 14, No 1 (2010): Edisi April Tahun 2010
Publisher : UNIVERSITAS LAMPUNG

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Abstract

Flowing concrete flow under it own weight and maintain homogeneity while filling and passingaround congested reinforcement. Flowing concrete is used to reduce or eliminate the need forvibration to reduce construction cost and reducing construction time. High strength flowingconcrete in this research used fly ash obtained from PLTU Suralaya Banten as substitutionmaterial the amount of cement. The properties investigated are workability, concrete setting time,unit weight, and compression strength. Proportion of material for concrete determined accordingto ACI 211-4R-1993 and combine with Hashimoto method. The substitution of fly ash to theconcrete are 0 %, 3%, 6%, 9%, 12% and 15% of the cement content. The test result indicated thateffect of fly ash in fresh concrete was increased the workability of the concrete. Addition of fly ashwas made fresh concrete enough cohesiveness without causing segregation. Addition of fly ashwas increased the initial and final setting time. The cylinder compression strength of fly ashflowing concrete at 7days, 14 days and 28 days was lower than compression strength of flowingconcrete without fly as at the same days. The optimum strength of fly ash flowing concrete was48,607 MPa at 56 days age in 9 % presence of fly ash.
GREEN PORT, KEHARUSAN BAGI PELABUHAN INTERNASIONAL MENUJU HUB PORT Alexander Purba
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 14, No 2 (2010): Edisi Agustus Tahun 2010
Publisher : UNIVERSITAS LAMPUNG

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Abstract

Green port memang merupakan hal baru bagi sebagian besar pelabuhan nasional maupun pelabuhan internasional di Indonesia. Kendati pe labuhan merupakan restricted area, namun hampir semua ocean going port di negara maju sudah  sejak lama menerapkan green port di pelabuhan-pelabuhannya. Pelabuhan tidak saja disibukk an dengan aktivitas bongkar-muat barang, namun juga sangat dekat dengan kegiatan bersifat ol ahraga dan wisata bahari. Namun, untuk dapat menggabungkan berbagai fungsi tersebut, pela buhan harus memiliki serta menjaga kawasan pelabuhan dengan konsep green port secara berkelanjutan. Pencemaran pantai, terutama akibat aktivitas bongkar-muat, misalnya, harus ditekan pada tingkat minimal. Demikian halnya keberadaan ruang terbuka hijau, harus diupayakan dan dijaga hingga tingkat maksimal, sehingga fungsi-fungsi konservasi di kawasan pelabuhan dapat tetap dipertahankan.
HYDRAULIC ANALYSIS OF THE JOHOR RIVER USING HEC-RAS Kusumastuti, Dyah Indriana
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 14, No 2 (2010): Edisi Agustus Tahun 2010
Publisher : UNIVERSITAS LAMPUNG

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Abstract

Kota Tinggi located in the southern state of Malaysia, i.e. Johor Baru, experienced severe floods in December 2006 and January 2007, which was due to prolonged and intense rainfall. Johor River was inadequate to accommodate the water and at the same time the flow unable to escape the swolen river, hence water inundated the town. One of the river characteristics that may contribute in flooding is the meandering shape. Therefore it was proposed to do a hydraulic model that simulated some alternate channels that straightened some parts of the river. The model used one dimensional steady state approach using HEC-RAS software. The simulation result of the existing condition estimated that January 2007 flood event had a return period of 100 years. From the hydraulic model, it can be concluded that the choice of location and the length of the alternate channel had an effect on how much water level reduced.
KAJIAN NILAI PCN RUNWAY BERDASAR METODE ANALITIK DAN METODE TEORITIK DI BANDARA H. ASAN SAMPIT Andius Dasa Putra
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 14, No 2 (2010): Edisi Agustus Tahun 2010
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Abstract

Implementation of air traffic safety is shown from good operation and free from activity which against the law. This statement has declared on Government Regulation about Air Traffic Safety in Indonesia. Analysis of Pavement Classification Number (PCN) value is the one of air traffic safety requirement. Due to that statement, this research try to evaluation and analysis about performance of runway based on analytical method and theoritical method using data from HWD (Heavy Weight Deflectometer) test. The result of performance runway will shown on PCN value.HWD tests are routinely conducted at the FAA to evaluate performance of pavemnet. HWD tests are conducted in two phases.In the first phase, HWD geophone sensors record vertical deflections at seven points on thepavement surface. The collected data are used for pavement evaluation and environment related thickness response analysis. In the second phase, the insitu pavement sensors record the pavement response while the HWD geophones record the defections on the pavement surface. These tests are conducted by placing the HWD load plate directly over the in situ deflection and strain sensors. One of the objectives of the HWD tests is to develop relationships between the applied load and measured deflections.The result of this research has shown that PCN value from analytical method is 9/F/A/X/T and theoritical method is 38/F/D/X/T. Code letter A or D on PCN value is describe about class of bearing capacity of subgrade. That difference of code letter bearing capacity due to HWD test directly collecting data of subgrade reaction under the pavement but the other method has taken data of subgrade from sample outside of runway . Increasing of bearing capacity of subgrade cause process of compaction on subgrade under the pavement has perfectly done.

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