JOURNAL TEKNIK SIPIL DAN INFRASTRUKTUR
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    EVALUASI DAN PERBAIKAN STRUKTUR GEDUNG DPRD MOROWALI BERDASARKAN PETA GEMPA 2010

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    Gedung yang telah mengalami kerusakan pasca gempa perlu segera dievaluasi untuk mengetahui penyebab kerusakan, elemen-elemen struktur yang mengalami kegagalan dan metode perbaikan atau perkuatan struktur. Untuk mengetahui hal tersebut, maka dilakukan penelitian dengan mengevaluasi struktur gedung tersebut dengan menerapkan beban gempa  sesuai peta gempa tahun 2010. Metode evaluasi yang dilakukan merujuk pada metode evaluasi struktur Takim Andriano dkk. Secara garis besar langkah-langkah metode yang dilakukan antra lain uji tes material eksisting (fc’ dan fy) , analisis kapasitas elemen struktur, analisis kembali struktur dengan Peta gempa tahun 2010 dan menentukan metode perkuatan untuk dilakukan. Hasil dari analisis tersebut memperlihatkan banyaknya elemen struktur yang mengalami kegagalan, khususnya kegagalan geser. Maka tindakan yang dapat dilakukan untuk menstabilkan struktur tersebut yakni dengan melakukan perkuatan elemen struktur yang mengalami kegagalan. Adapun metode-metode perkuatan struktur seperti penyelubungan (jacketing) dengan bahan (baja, baja spiral, beton atau komposit), penambahan tulangan luar dengan bahan steel strap/plate, tulangan sengkang, Penulangan luar berupa plat baja, Injeksi epoksi, dan metode perkuatan dengan menggunakan Fiber Reinforced Polymer.Kata Kunci : evaluasi struktur, Peta Gempa 2010, metode perbaikan struktu

    ANALISIS SIFAT FISIK MATERIAL PERKERASAN JALAN HASIL DAUR ULANG

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    Pavement recycling is one of resources conservation and preservation methods. Using of Reclaimed Asphalt Pavement (RAP) can give contribution to pavement quality because its quality reduction possibility due to over load of vehicle in lifetime service. For that reason, RAP physical properties research would be taken. This research using aggregat and bitumen which is come from RAP extraction. Aggregat testing such as Impact Value (AIV) test, Aggregat Pressure Value (APV) test and Spesific gravity test. Bitumen testing are penetration test, softening point test and  Spesific gravity test. According to the research result, was found that RAP aggregat can be used as a pavement material. The fact can be figure out from AIV value is about 6,6% and ACV value is 20,4%. Otherwise RAP aggregat gradation is not fulfill the specification, so that gradation modified must be taken. RAP bitumen testing showing that penetration value is 21,6 dmm and softening point value is 57°C. It means that adding modifier or rejuvenating agent is necessary to do to increase quality of RAP bitumen   Keywords: RAP aggregate, RAP bitumen, recyclin

    PENGARUH PENAMBAHAN POLIMER ELASTOMER TERHADAP INDEKS PENETRASI ASPAL YANG MENGANDUNG ASPAL DAUR ULANG

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    Nilai Indeks Penetrasi (PI) pada aspal, menunjukkan ketahanan aspal tersebut terhadap perubahan temperatur. Penggunaan perkerasan daur ulang (RAP) dalam hal ini aspal daur ulang, tentunya akan menurunkan tingkat ketahanan aspal terhadap perubahan temperatur. Makin rendah tingkat ketahanan aspal terhadap perubahan temperatur, maka makin buruk mutu dari aspal tersebut. Untuk itulah diperlukan modifikasi terhadap aspal daur ulang sehingga dapat memperbaiki tingkat kepekaannya terhadap perubahan temperatur. Dalam penelitian ini digunakan modifikasi aspal dengan tambahan polimer elastomer yaitu polimer Styrene-Butadiene-Styrene (SBS) dengan persentase 2,5% dan 5% terhadap berat aspal. Dan bitumen daur ulang yang digunakan sebesar 30% dan 40% terhadap berat aspal. Dalam menentukan nilai Indeks Penetrasi digunakan berdasarkan persamaan Pfeiffer dan Van Doormall, yang merupakan hubungan antara nilai penetrasi dan titik lembek aspal. Berdasarkan hasil yang diperoleh,  nilai indeks penetrasi tertinggi diberikan oleh campuran dengan kandungan RAP 0% dan SBS 5% yaitu sebesar -0,040. Dari hasil analisa terlihat bahwa penambahan polimer SBS dapat meningkatkan nilai indeks penetrasi (PI) yang berarti dapat menaikkan tingkat ketahanan aspal terhadap perubahan temperatur. Kata Kunci : indeks penetrasi, aspal, daur ulan

    PERENCANAAN DAN PENGENDALIAN MATERIAL PADA PROYEK KONSTRUKSI PALU GRAND MALL

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    Palu Grand Mall construction project is a large-scale construction projects that use different types of materials with large amounts. Therefore, the planning and control of the appropriate material to be very important. The purpose of this study was to determine how the   process of planning and control of material and to determine the size of the procurement quantity of material from the two methods of inventory control consists of methods Lot For Lot and Economic Ordering Quantity method that provides the most optimal total costs in construction projects Palu Grand Mall. The method used in this thesis is descriptive photograph and methods Material Requirement Planning (MRP) consist of methods Lot For Lot (L4L) and the Economic Ordering Quantity (EOQ). The results revealed that, in the process of planning and controlling materials on construction projects Palu Grand Mall is the starting material requirements planning, material selection and proceed with the selection of suppliers of materials. Once that is done the booking and purchase of materials. Then the material receipt and storage of materials. The last process in the release of material to the construction site. Planning material procurement inventory control method provides a theoretical optimum total cost of inventory is a combined method of EOQ method and method L4L. The measure of the quantity of material procurement is a 5066 D19 iron rod, iron rods Ø10 number 58 591, iron rods D22 number 6638, beam 5/7 number 415 m3, and multiplex sheet 2903 with a total cost of inventories of Rp3.488.366, -.   Keywords: material, process planning and control, MR

    KETELITIAN METODE EMPIRIS UNTUK MENGHITUNG DEBIT BANJIR RANCANGAN DI DAS BANGGA

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    Characteristics of Bangga watershed that involves the shape, topography, type of soil, vegetation and areal usage, tends to enable the occurrence of run-off and erosion in the event of high rain fall. Therefore, it requires a flood design debit measurement to obtain the value of flood design for its river basin. The method used in this research is to compare the design values of the rain fall data using Rational, Melchior, Weduwen, Haspers and Unit Synthetic Hydrograph of Nakayasu methods towards the measured flood design debit using frequency distribution methods according to several statistical parameters. The results of the comparison of several methods towards flood debit design obtained from measured debit data using log Pearson III are: for the largest deviation is 2278.21 % for 2 years return period using Haspers method, whereas for the smallest deviations was obtained using Rational method which was 23.41  %, as well as for 5, 10, 25, 50 and 100 years return period, the values were 5.21 %, -2.38 %, -9.40 %, -13.38 % and -16.64 % respectively, hence it can be taken into conclusion that Rational method could be applied in designing water buildings in Bangga river basin. Keywords: design flood discharge, rainfall data, discharge data (measured

    KETERSEDIAAN DAN KEBUTUHAN TENAGA KONSTRUKSI JALAN DI PROVINSI SULAWESI TENGAH

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    Meningkatnya pembangunan konstruksi di Provinsi Sulawesi Tengah, tentunya diperlukan  tenaga konstruksi yang profesional. Tetapi pada kenyataan jumlah tenaga konstruksi khususnya tenaga konstruksi   yang bersertifikat, sekitar 11,75% dari jumlah tenaga konstruksi,yaitu  4311 orang memiliki sertifikat keterampilan dan 983 orang memiliki sertifikat keahlian. Fakta menunjukkan  bahwa masih banyaknya perusahaan penyedia jasa konstruksi jalan yang belum memiliki tenaga kerja bersertifikat keahlian maupun keterampilan. Tujuan penelitian ini adalah, (a) untuk  mengetahui dan mempelajari bagaimana kondisi kapasitas dan kebutuhan tenaga konstruksi secara keseluruhan di Provinsi Sulawesi Tengah; (b)  untuk melakukan pemetaanketersediaan dan kebutuhan tenaga konstruksi di Provinsi Sulawesi tengah. Penelitian ini merupakan penelitian deskriptif, metode survey,  wawancara dan  dilengkapi juga dengan pengisian kuesioner. Populasi penelitian adalah semua perusahaan kontraktor, konsultan perencana dan konsultan pengawas yang bergerak di bidang pekerjaan  konstruksi jalan di Provinsi Sulawesi Tengah, pengguna jasa, serta institusi penyedia tenaga kerja konstruksiSedangkan data sekunder diperoleh dari data proyek jalan  yang ada di wilayah Provinsi Sulawesi Tengah. Hasil penelitian menyatakan:  (1) masih belum adanya  kesesuaian antara  ketersediaan dan kebutuhan tenaga konstruksi  yang mendukung penyelenggaraan  pekerjaan  konstruksi  di Provinsi Sulawesi Tengah dan juga masih adanya sebagian tenaga ahli jalan yang kurang kompetensi serta profesional dalam pekerjaannya; (2) ketersediaan tenaga ahli konstruksi jalan menunjukkan hanya ada 24,6 % ( 318 orang)  dibandingkan dengan kebutuhan (1292 orang) yang ada di provinsi Sulawesi Tengah pada tahun 2012. Sedangkan dilihat dari kelulusan dijurusan  keteknikan rata-rata pertahun dapat mengeluarkan lulusan sekitar 25,3 %  (246 orang) dibandingkan dari  kebutuhan (974  orang), dengan asumsi semua lulusan bekerja sesuai bidangnya. Kata Kunci : ketersediaan, kebutuhan, Tenaga Ahli, konstruksi jala

    IDENTIFIKASI KELEMAHAN METODE EARNED VALUE PADA PENGUKURAN KINERJA BIAYA DAN WAKTU PROYEK KONSTRUKSI

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    Earned Value method (EV) has several weaknesses which makes it difficult to optimally apply in the construction projects. This study aims to identify the shortcomings of Earned Value related to the project cost and time performance. Literature study was conducted from the various sources related to the EV topic. The result shows that the main weakness of Earned Value method are: EV prediction method is assumed deterministic, linear, non-dynamic and does not accommodate uncertainty factors of time and cost of construction projects.   Keywords: construction  project, time and cost performance, earned valu

    STUDI PERUBAHAN KARAKTERISTIK PASIR SIURI AKIBAT PENAMBAHAN BUTIRAN HALUS NONPLASTIS (STUDI KASUS FC > FCth)

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    Hubungan dari perilaku fisik dan mekanis pada jenis tanah bercampuran butiran halus belumlah tepat  jika hanya mengindikasikan penggunaan nilai angka pori (e) saja, maka penggunaan angka pori interfine disarankan untuk kondisi pasir bercampur butiran halus dengan jumlah butiran halus di atas ambang batas kandungan butiran halus (FC > FCth). Untuk mengetahui sifat fisik dan mekanik, letak nilai ambang batas kandungan butiran halus (FCth) serta hubungan antara angka pori interfine dan kuat geser terhadap  campuran pasir Siuri dan butiran halusnya, dilakukan pengujian di laboratorium dengan mencampur butiran  kasar dan butiran halus  pasir Siuri dengan jumlah butiran halus nonplastis yang bervariasi, mulai dari 0% sampai 100% terhadap berat campuran. Hasil penelitian menunjukkan bahwa nilai ambang batas kandungan butiran halus (FCth) berada di antara 30%-40% penambahan butiran halus. Untuk hubungan  sifat fisik dan mekanik dari campuran pasir dengan butiran halus ini,  nilai berat isi akan meningkat sedangkan nilai angka pori mengalami penurunan sampai pada ambang batas kandungan butiran halus (FCth), selanjutnya kondisi sebaliknya akan terjadi setelah melewati nilai (FCth) tersebut. Untuk hubungan angka pori interfine (ef) dengan Kuat geser (t)  menunjukkan bahwa dengan penambahan butiran halus nonplastis di atas ambang batas kandungan butiran halus (FCth ≥30%), akan menyebabkan penurunan nilai angka pori interfine (ef). Sedangkan untuk nilai tegangan gesernya juga mengalami penurunan seiring menurunnya nilai angka pori interfine (ef). Kata kunci : Pasir Siuri, kuat geser, angka pori interfine (ef), kadar butiran halu

    KAPASITAS LENTUR BALOK BETON BERTULANG DENGAN MENGGUNAKAN AGREGAT KASAR TEMPURUNG KELAPA

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    Beam and plate are dominant element of a reinforced concrete building which experience pressure and flexural moment due to gravity which are live and dead loads. This research aims to find out the value of flexural capacity of reinforced concrete beam using coconut shell as coarse aggregate. The laboratory test results and the theoretical result were compared. In this research, beam of 175 x 350 x 1400 mm were used, the identical push-load used were 2 D 5,6  mm and variation of the number of tensile reinforcement were 4 D 7,8 mm; 5 D 7,8 mm, and 6 D 7,8 mm. Each variation is presented in three samples. Hence, resulting different maximum loads.The result obtained as concrete unit weight, which are 1,773 gr/cm3, push-load strength of 13,59 MPa, average flexural capacity of 95 kN for BL 41 to BL 43 and 115 kN for BL 51 to BL 63. The result of flexural capacity of BL 51 to BL 63 was not fully reached due to incompetency of the testing instrument.   Keywords: flexural capacity, beam, coconut shell concret

    ANALISIS STABILITAS LERENG DENGAN MENGGUNAKAN METODE BIOTEKNIK PADA RUAS JALAN TAWAELI – TOBOLI

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    Tawaeli - Toboli is one of road that oftentimes undergo landslide. Most of these roads are in a mountainous area with steep slope angles . The road conditions worsened, especially the citizen do not know anywhere that is prone to landslides. The purpose of this study was to analyze slope stability using bioengineering methods. This method is used to increase the strength of the soil, and stabilize slopes and reduce erosion on slopes .The primary data for this study were obtained by conducting laboratory tests, including testing of bulk density, moisture content, density and shear testing directly without the influence of vegetation roots and the influence of vegetation roots to get the cohesion (c) and friction angle (ϕ ). Data field conditions include high slope and vegetation types. Analysis of slope stability calculated using the Slope / W. Calculation of earth pressure is calculated using the Rankine and Coulomb theories and calculations of stability against the collapse of the soil bearing capacity is calculated based on the equation Hansen and Vesic .From the results of the analysis showed that the presence of plant roots can increase the value of the cohesion and friction angle of the soil that can contribute to an increased safety factor of slope stability. Slope stability analysis using program Slope/W at the root of the condition without having the stability of the landslide is smaller compared with the conditions of using the roots , the results of the calculation of the shear strength of the soil without roots is smaller than the roots and results of calculations using the stability of the retaining wall retaining wall with the same dimensions at which point I Km 17 ± 300, the cantilever type retaining walls with roots influences security ineligible dimensional slope stability due to the retaining wall is not in accordance with the conditions of soil containing the roots of plants. Increasing the value of cohesion and angle of friction on the ground with roots influences can maintain the stability of the slope. Keywords: retaining walls, bioengineering, landslid

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