Sand is one of the building materials forming the concrete mass. Sand has a type based on quarry sources, namely sea sand, river sand and mountain sand. Sand has different characteristics such as gradations (grain fineness), unit weight, mud content. Based on the SK-SNI 03-2834-1993 standard, sand has a grain size which is classified as very rough, rough, medium, smooth and very smooth. Sand that has a good gradation is separated in the form of a graph as zones 1 to 4. Concrete has good compressive strength but is weak on tensile strength. To increase the tensile strength, fiber can be added. The use of wire fiber is expected to increase the performance of buildings in earthquake-prone areas. In this study the fiber used was metal wire with a length of approximately 2 cm, designed compressive strength of concrete of 25 MPa, with a cylindrical sample diameter of 15cm and a height of 30cm, 3 month old age split tensile strength test was conducted, by using sea and mountain river sand with different zones. The results obtained that the division of the sand zone into rough to fine classification does not provide a significant trend for the tensile strength of the concrete. Mechanically, the addition of wire fibers for Air Lakok sand, Lubuk Kebur river sand and Penanding river sand has decreased the tensile strength. While the sea sand of Selubuk, the river sand of Talang Rasau and the mountain sand has increased tensile strength. Visually, all concrete that is given wire fiber has better ductility, where the concrete does not experience brittle cracks and the elements are still bound to each other.
Portland cement is a relatively expensive type of cement when used on constructions requiring simple requirements. Local material utilization using ash fragments of coral reefs and rice husk ash is one of the solutions. The objectives of this study is to determine the value of concrete compressive strength in each variation of cement replacement used were 2.5%, 5%, 7.5% and 10%, each variation consists of 70% ash fragment of coral reefs and 30% rice husk ash from the volume of cement used. The cube specimen with a size of (15x15x15) cm as many as 20 specimen were prepared. Concrete mixture according to SNI 03-2834-2000 used 0.5 cement water ratio and 60-100 mm of slump. The result of the compressive strength of concrete variation every percentage increase has increased and decreased from the result of the normal concrete compressive strength of 368.24 kg/cm2. Maximum increase occurred in the concrete compressive strength variation 7.5% of 384.76 kg/cm2 and decreased on the concrete compressive strength variation 10% of 367.40 kg/cm2.
Concrete has a high compressive strength, but it is low to tensile strength. The pinang skin fiber and wood powderuse to increase the tensile strength. The purpose of this research is to know the effect of addition toward tensile strength and addition percentage variation in concrete that will get the highest tensile strength.The cylindrical specimens with size of 30 cm high and 15 cm diameter to 20 specimens, they are 4 sample of normal concrete and 16 sample of variation oncrete. The addition of pinang skin fiber and wood powder with variation of 0.25%, 0.5%, 0.75%, and 1% of the weight volume of the specimen with used 50% pinang skin fiber and 50% wood powder.The mixture of concrete uses water cement ratioof 0.5 and 60-100 mm slump.The test specimen is immersed for 26 days and the concrete tensile strength test conducted after the concrete at 28 days adding 7 days for drying.The result of this research shows that the variation concrete of 0.25% and 0.5% have increased of tensile strength than the normal concrete as 12.272% and 4.369%. Beside that for the variation concrete of 0.75% and 1% have decreased as 5.044% and 11.929%. The increase of tensile strength value of optimal concrete is found in variation 0.25% that is 12.272% from normal concrete.
Abstrak: Analisis Debit Puncak Dengan Pendekatan Metode Hidrograf Satuan Sintetis ITB2 Dan Hec Ras 5.0.7 Pada Das Air Manna Bagian Hilir. Tujuan dari penelitian ini adalah menganalisis debit puncak Das Air Manna Bagian Hilir dan menganalisis titik lokasi yang akan melimpas berpotensi banjir menggunakan software HEC-RAS versi 5.0.7. Penelitian ini menggunakan data sekunder berupa curah hujan harian selama 10 tahun dari 3 stasiun hujan. Metode yang digunakan untuk menentukan debit puncak adalah menggunakan pendekatan metode Hidrograf Satuan Sintetis (HSS) ITB 2 yang kemudian diintegrasikan kedalam program HEC-RAS versi 5.0.7. Hasil penelitian ini menunjukkan debit puncak pada daerah aliran sungai Air Manna sangat tinggi dibandingkan dengan fakta yang ada dilapangan sehingga perlu dilakukan penelitian ulang dengan titik tinjauan yang lebih banyak. Berdasarkan hasil analisis dari program HEC-RAS didapat bahwa Sungai Air Manna Bagian Hilir sudah tidak mampu menampung debit banjir, daerah potensi banjir terjadi disepanjang STA 5770 (Desa Batu Kuning) sampai ke STA 0 (Desa Ketaping). Kata kunci : Debit puncak, HSS ITB 2, HEC-RAS 5.0.7, DAS Air Manna, Banjir Abstract: Analysis Of Peak Discharge Using Synthetic Units Hydrograph ITB 2 (HSS-ITB 2) And Hec-Ras 5.0.7 At Downstream Watershed Air Manna. The research aims to analyze the peak discharge (Maximum) of Air Manna’s DAS Downstream and the location points that it will potentially overflow. This research used HEC-RAS program with version 5.0.7. The research’s Secondary data is in the form of daily rainfall for 10 years from 3 rain stations. The method used to determine the peak discharge was using the ITB 2 Synthetic Unit Hydrograph (HSS) method which was then integrated into the HEC-RAS progam with version 5.0.7. The results showed top of flow on stream Manna river is very high than by the fact in the field, so need to do repetitive research in more spot of river. Based on the results of the analysis of the HEC-RAS program, it was found that the Air Manna River Downstream was unable to accommodate the flood discharge, the potential flood areas occurred along STA 5770 (Batu Kuning Village) to STA 0 (Ketaping Village). Keywords: Peak discharge, HSS ITB 2, HEC-RAS 5.0.7, DAS Air Manna Downstream, Flood
Gedung J Universitas Bengkulu merupakan gedung kuliah yang digunakan oleh Fakultas Hukum. Gedung J sangat dekatdengan bibir pantai menyebabkan gedung ini sangat rawan terhadap bencana tsunami. Jalur evakuasi bencana sangatdibutuhkan untuk menanggulangi dan mengurangi korban jiwa. Penelitian ini bertujuan untuk merencanakan modelperjalanan evakuasi bencana tsunami dan mengatasi ruas jalan yang bermasalah. Penelitian ini menggunakan metode AgentBased Modelling dengan bantuan aplikasi NetLogo versi 6.0.4. Data primer yang digunakan adalah denah gedung dangeometri jaringan jalan. Data sekunder yang diperlukan meliputi jumlah orang yang ada didalam gedung kuliah.Pengambilan kuisioner dilaksanakan dengan pengambilan sampel, kemudian data dianalisis secara statistik meliputi ujivaliditas data, derajat kejenuhan, volume, kapasitas, dan tes analisis regresi linier sederhana. Penelitian ini menggambarkan12 ruas jalan dan 3 rute alternatif. Analisis data yang dilakukan menunjukkan kondisi ruas jalan yang ditinjau berdasarkanhasil perbandingan data kuisioner dan simulasi. Rute alternatif evakuasi yang banyak dipilih responden adalah rutealternatif 1, hal ini dikarenakan jalan terdekat ketika pengungsi menuju pintu keluar. Selain itu, nilai derajat kejenuhanserta kapasitas yang tinggi menunjukkan perlunya pengembangan kinerja jaringan jalan lokal Universitas Bengkulu,sehingga ketika evakuasi tidak terjadi hambatan bagi pengungsi.
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