Jurnal Rekayasa Sipil dan Desain
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Analisis Kuat Lentur Nominal Balok Komposit Menggunakan Program Berbasis Android
Full text linkComposite beam is a combination of concrete and steel profiles. Nominal flexural strengthanalysis of composite cross-section can be calculated manually, but it takes a long time or are notefficient when calculating the nominal flexural strength analysis of composite beams. In this study,it can be a formulation of the problem is how to apply the analysis to the nominal flexural strengthcomposite into android-based programs. The purpose of this study in this thesis is to simplify thecalculation of the nominal flexural strength analysis of composite beams using android basedapplication program. Object-based research to create a program that profiles IWF android withconcrete (composite beam).In the implementation of this study using two methods: the method of literature study (study oftheory) and methods of software development (analysis, design, coding, and testing).This program has been tested with manual calculations that show the results accordingly. Fromthe test results indicate that the ease of use of program-based program that android is moresimple and easy to use in the field.Keywords: composite beam, android, nominal flexural strength analysi
Studi Pemodelan Curah hujan sintetik dari beberapa stasiun di wilayah Pringsewu
Full text linkThis research conducted to study the characteristics of daily rainfall and model making ofsynthetic daily rainfall in Pringsewu regency using periodic model, stochastic model and periodicstochastic models. This research conducted using daily rainfall data with length of 1984-2013from three rainfall stations, Pringsewu, Wonokriyo and Banyuwangi rainfall stations.These models performed by using 512 days annual data. Using rainfall frequency obtained andapplying the spectral method and the least squares method, it can be generated the daily rainfallperiodic models. Rainfall stochastic model assumed as the difference between rainfall data withperiodic rainfall models. Based on data from the series of stochastic, the component wascalculated using the approach of autoregressive models. Stochastic model was presented by usingthe autoregressive model of order three. Periodic stochastic model obtained by merging periodicmodel and stochastic model. Model validation and data obtained by calculating the correlationcoefficient. Based on the results of this research, it can be concluded that daily rainfall time seriescan be very significantly approximately recorded rainfall data. With the the average value ofcoefficient correlation of periodic model is 0.98019, coefficient correlation of stochastic model is0.99808, and coefficient correlation stochastic of periodic model is 0.99993keywords: daily rainfall, autoregresif models, stochastic component
Studi Analisis Daya Dukung Tanah Lempung Berplastisitas Tinggi yang Dicampur Zeolit
Full text linkC lay has properties that are not profitable for construction. This is because the bearing capacityof the soil or low CBR have low value. Therefore we need a stabilizing agent that can reduce soilproperties which are unprofitable, usually accompanied by binding to each soil grain with theother .The research was done by testing on clay samples without a mixture and the clay that is mixedwith zeolite with a variation of 6%, 8%, 10%, 12% and 14%. Tests were performed using standardand modified compaction which previously done curing for 14 days. After compaction test, thesamples were soaked for 4 days and then followed by mechanical testing which is CBR test thataimed to determine the bearing capacity value of the soil after the sample was mixed by zeolites.Based on the results of laboratory research, the highest value obtained on the sample CBR claywith a mixture of 14% zeolite with the use of modified compaction with 14 days of curingand 4days of soaking in the amount of 2.78%. This is because the effect of zeolite which can bind clayparticles. So, the more a mixture of zeolite then bearing capacity of the soil also increasing.However, the value of CBR in this research can not be used as subgrade in road constructionbecause of its CBR value ≤ 6%.Keywords: CBR, Soil Clay, Zeolit
Hubungan Batas Cair dan Plastisitas Indeks Tanah Lempung yang Disubstitusi Pasir Terhadap Nilai Kohesi Tanah pada Uji Direct Shear
Full text linkThe Clay has a low shear force properties, large density, small permeability coefficient and has alow bearing capacity. To increase the bearing capacity of the clay can be used a mixture of sand.In this study, the test is done by using the Direct Shear test, which will be a reference in relation ofliquid limit and plasticity index to the value of cohesion (c) of each soil sample that has beensubstituted with sand.Soil samples used an original soil samples and disturbed soil of clay that comes from threelocations: the area Margakaya Jati Agung South Lampung, Palputih Karang Anyar SouthLampung , and Belimbing Sari Jabung East Lampung. Clay will be mixed with sand No.40 sieve(0.43 mm) in accordance with the required percentage of the variation in sand content of 0%, 5%,10%, and 15%.Based on AASHTO classification system, the three of soil include to the class of ordinary clay soilup to bad as subgrade material. The addition of sand mixture into three types of clay causingdecreased shear strength. The greater the addition of sand content, then the value of cohesion (c),liquid limit and plasticity index of the soil will decrease and shear angle will increase.Keywords : shear strength, Atterberg limits, Clay, Sand
Pengaruh Suhu Tumbukan pada Campuran Aspal Beton dengan Jenis Lapis AC-WC Gradasi Halus
Full text linkThis study was conducted to determine the effect of temperature on the Marshall parameterscompaction to mix AC - WC subtle gradations central limit. Optimum Asphalt Content Value(KAO) in the study sought to use 15 samples and done in the laboratory of Highway University ofLampung. From the analysis of the Marshall parameters obtained KAO mixture is 5.7%. Marshallparameter data retrieval is done twice trials, each experiment using 2x24 samples with the sametreatment for each experiment. Compaction temperature is 120 o C-155 o C is reviewed by varasi5 o C.From the results of experiments that have been conducted, Marshall parameter valuesobtained in experiment 1 and experiment 2 is not too much different. In general, the Stability,Flow, VMA and VFA qualify specifications bina marga 2010, the MQ does not meet thespecifications of 135 o C or lower temperatures and VIM value does not meet the specifications of130 o C or lower temperatures.Based on the tendency of marshall parameter values obtained fromexperiment 1 and experiment 2 indicate that the data obtained from these experiments hasparticularly a small false possibility.Keywords: AC-WC, KAO, Marshall parameter, temperature compaction