1,720,969 research outputs found
Perilaku Beban-Perpindahan Aksial Pre-Buckling dan Post-Buckling pada Struktur Kolom Elastis
Full text linkThe analysis of column buckling is generally based on the analysis of linear eigenvalue problem to obtain the buckling load. In the linear analysis we do not know the load-displacement behavior especially after buckling occurs. This research studied the behavior of the elastic column on the stage pre-buckling and post-buckling by finite gemetrically nonlinear of finite element method. Difficulties in equilibrium problem at around the point of buckling load solved by using the Newton-Raphson incremental method with constant arc- length technique. To generate the initial touch of buckling columns are very small lateral load or by providing the initial lateral deformation is very small. Axial load-displacement curve column finite element analysis results compared to the results of previous reseacher. An axial load-displacement curve bilinear proposed in this study
Perilaku Nonlinier Buckling pada Struktur Cangkang Bola
Full text linkThis paper presents the results of a numerical study using the finite element method in geometrical nonlinear on camped shallow spherical shells under uniform pressure. The shell structure was modelled by finite axisymmetric thin shell elements and quadrilateral elements. The geometrical nonlininear problem was solved by a scheme of incremental iterative procedures applying Newton-Raphson method in combination with arch length methods. The results of finite element analysis compared with the experimental results of previous reseacher
Analisis Efektivitas Model Perkuatan dengan Injeksi Semen untuk Peningkatan Angka Keamanan Lereng
Full text linkThe problem of slope stability can be overcome by grouting of cement paste. But, the question often arises as to the extent of grouting of cement paste can increase the factor of safety. This study aims to determine the effectiveness of the effect of grouting on increasing safety factor on the slope of embankment. Experiments have been conducted in the laboratory using 6 types of mixed samples of sand and coarse aggregate. Field testing was conducted on 1 model to determine the effectiveness of grouting. The results of the experiments show that the injection of cement paste in this study proved to be effective in strengthening the embankment with the content of coarse aggregate 60%. The increase factor of safety (FS) using grouting is from FS= 1.9 (33.3%) to FS = 2.80 (90.0%). Factors determining the effectiveness of injection are: (a) injection method with drilling technique before injection to form cement column; (b) the optimum of water-cement ratio w/c = 1.5; (c) the ratio of spacing and injection diameter Lg / Dg = 8, the depth of injection 0.75 from the height of the embankment
Analisis Efektivitas Model Perkuatan dengan Injeksi Semen untuk Peningkatan Angka Keamanan Lereng
Full text linkThe problem of slope stability can be overcome by grouting of cement paste. But, the question often arises as to the extent of grouting of cement paste can increase the factor of safety. This study aims to determine the effectiveness of the effect of grouting on increasing safety factor on the slope of embankment. Experiments have been conducted in the laboratory using 6 types of mixed samples of sand and coarse aggregate. Field testing was conducted on 1 model to determine the effectiveness of grouting. The results of the experiments show that the injection of cement paste in this study proved to be effective in strengthening the embankment with the content of coarse aggregate 60%. The increase factor of safety (FS) using grouting is from FS= 1.9 (33.3%) to FS = 2.80 (90.0%). Factors determining the effectiveness of injection are: (a) injection method with drilling technique before injection to form cement column; (b) the optimum of water-cement ratio w/c = 1.5; (c) the ratio of spacing and injection diameter Lg / Dg = 8, the depth of injection 0.75 from the height of the embankment.</jats:p
Design of Low Alkali Activator Geopolymer Concrete Mixtures
Full text linkThis paper presents the results of research on the design of geopolymer concrete mixes. The main objective of this research is to develop an efficient and easy design of low-alkaline activator geopolymer concrete mixture, which until now has been the biggest obstacle in the use of geopolymer concrete. The variables reviewed were the amount of alkaline activator was quite low at 4%, room temperature and 60oC ratio of alkaline activator/fly ash (AAS/FA) were 0.35, 0.4, 0.5, 0.6. The test results show the parameters of geopolymer concrete with low alkali activator 4%, sodium silicate/sodium hydroxide ratio 2.5%, sodium hydroxide molarity 14M, type F fly ash and the discovery of the relationship model of compressive strength and the ratio of alkali activator/fly ash with a very high correlation as basic development of geopolymer concrete mix design. The design of the geopolymer concrete mix developed is easy because it is application-based and efficient because it only requires 4% alkaline activator
EVALUATION OF SIDEWALK BASED ON THE INDONESIAN GUIDELINE FOR TECHNICAL PLANNING OF PEDESTRIAN FACILITIES
Full text linkSidewalks are pedestrian paths generally parallel to road and higher than the pavement surface to ensure the safety of pedestrians. Sidewalk is important for pedestrians; thus, it has to meet the standards of technical requirement. This study aimed to evaluate condition of sidewalk in Kudus City, Indonesia to find out whether the existing sidewalks had complied with the technical requirement as stipulated in the Indonesian guideline for technical planning of pedestrian facilities. This was a descriptive quantitative study involving sidewalks as the sample. Data were collected through survey and analyzed quantitatively. Despite having several issues around design of the construction, the existing sidewalk in Kudus City, Indonesia had been in accordance with the provision as prescribed in the Indonesian guideline for technical planning of pedestrian facilities. Finding of the study suggested that sidewalks need for further improvement for the convenience of pedestrians, especially signposts, sidewalk accessories, direction and other relevant properties.Keywords: Descriptive qualitative study, Indonesian standard of public facilities development, pedestrians, sidewalk
Pengaruh Sudut Pemasangan Nail Terhadap Stabilisasi Lereng Metode Soil Nailing Di Ruas Jalan Giriwoyo-Glonggong
Full text linkPenelitian ini membahas mengenai angka keamanan (safety factor) lereng yang dibentuk untuk menyediakan ruang bagi trase Jalan Jalur Lintas Selatan yang berada di Ruas Jalan Giriwoyo – Glonggong KM. STA. 81+200. Perhitungan angka keamanan lereng eksisting dilakukan secara manual maupun dengan bantuan Software Geoslope 2012. Perhitungan lereng eksisting tidak memenuhi nilai rekomendasi angka keamanan lereng permanen yang diberikan SNI 8460:2017, yakni sebesar 1,50. Perkuatan dilakukan dengan metode soil nailing dengan tipe drilled and grouted. Final facing menggunakan beton semprot (shotcrete). Hasil perhitungan menyatakan bahwa sudut aman pemasangan nail terhadap bidang horizontal adalah pada range 17° s/d 20°. Dari analisa yang dilakukan, sudut pemasangan nail memiliki pengaruh terhadap angka keamanan global lereng. SNI 8460:2017 memberikan rekomendasi sudut pemasangan nail 10° s/d 20° namun untuk kasus di lokasi penelitian ini, sudut 10° s/d 16° tidak memenuhi syarat stabilitas internal (putus nail & cabut nail). Dilakukan simulasi perhitungan angka keamanan dengan variasi sudut pemasangan nail 10° s/d 20° dengan kesimpulan yang didapat adalah semakin besar sudut pemasangan nail maka semakin kecil nilai angka keamanan global lereng.
Do Project Management Determine Successful Completion of Projects? A Study of Indonesian Contractors
Full text linkAbstractFor a successful execution of construction projects, project owners and contractors need for a good management system capable of monitoring and evaluating progress of the project. By employing a descriptive quantitative method, this study aimed to explore project management components used by contractors in the city of Kudus, Central Java Indonesia and to find out its relation to successful completion of their projects and determine the most dominant component in the management. Data for the study were in the form of numbers collected from 100 respondents through survey. Finding of the study were then quantitatively analyzed based on our pre-determined criteria. Our findings showed successful completion of projects was very much determined by the quality of project management, including planning, organizing, actuating and controlling. Among those four components of management, organization was the most dominant aspect to influence successful execution of a project. Role of organization in the project was critical to coordinate parties by which they were enabled to supervise, optimize specialization, efficiently use the budget and build harmonious relationship among parties.Keyword: Management, Contractor, Work Qualit
STUDI METODE PERKUATAN LERENG MENGGUNAKAN GEOMAT, SHOTCRETE, DAN SOIL NAILING (Studi Kasus: Lereng Spillway Bendungan Sadarwana Paket II Subang)
Full text linkThe landslide of the upper slope in the excavation work of the spillway SadawarnaDam Package II Subang occurred after rain, precisely at the STA location from0+500 to 0+520. The purpose of the study was to compare soil reinforcement on theprevious spillway slope using geomat and shotcrete with soil reinforcement usingsoil nailing. Based on soil data the spillway slope consists of two types of slopes, theupper slope consists of CL (BS:03) while the lower consists of ML (BS:04). Theshear strength parameters C and Phi of both slope soils are quite high. Using PlaxisV.21, Slope/W and Seep/W, with C and Phi the slopes were found to be stable.However, in reality there was a landslide on the upper slope. Therefore, backanalysis was performed by lowering the strength parameters of the top soil adjacentto the slope until the landslide was realized. The reinforcement used on the twoslopes was different, the upper slope used geomat while the lower slope usedshotcrete, then the geomat was changed to soil nailing. Two seasonal models wereapplied to all reinforcements. The results showed that the factor of safety valuesfrom the back analysis modeling in the wet season using geomat and shotcrete wereless than 1 (Unstable). However, reinforcement using soil nailing has a SafetyFactor higher than 1.5. Based on these results, soil nailing can be a solution tominimize landslides on the spillway slope
ANALISA APLIKASI BETON RINGAN PADA SALURAN U-DITCH
Full text linkBahan beton di Indonesia, bahkan di seluruh dunia selalu mengalami perkembangan pada tahun ke tahun. U-Ditch beton bertulang adalah suatu bentuk inovasi dari beton pra-cetak yang diperuntukan sebagai saluran, drainase maupun saluran irigasi. Beton ringan yang hanya digunakan untuk beton non-struktural sekarang mulai berkembang dan banyak dilakukan penelitian untuk beton mutu tinggi dengan berat yang ringan sehingga mengurangin berat stuktur itu sendiri. Berdasarkan permasalahan diatas, maka perlu dikembangkan suatu produk U-ditch pra-cetak dengan kualitas mutu yang tinggi namun memiliki berat yang ringan sehingga mudah untuk diangkat.Dengan mengunaka metode perhitungan campuran beton ringan SNI 03-3449-2002 tentang “Tata Cara Rencana Pembuatan Campuran Beton Ringan Dengan Agregat Ringanâ€. Hasil dari perhitungan tersebut di dapatkan berat isi beton sebesar 1753,89 kg/m3 lebih ringan 20,35% dari pada beton normal. Pengujian kuat tekan beton ringan sebesar 20,879 MPa atau 251,55 Kg/cm2. Untuk mengetahui u-ditch dapatmengunkan bahan beton ringgan, maka dilakukan pemodelan menggunakan SAP2000 v.14 untuk melihat gaya-gaya pada dinding dan plat lantai u-ditch tersebut. Momen maksimal yang terjadi sebesar 0,9404 kN.m/m dan penulangan didapatkan tulangan lentur D10-150. Pembuatan beton pra-cetak u-ditch dengan ukuran 40 X 40 X 100 X 6, dengan tulangan lentur D10-150 seperti pada produksi yang biasa dilakukan oleh PT. Agung Beton. Menghasilkan berat u-ditch 138 kg sehinggan dapat di angkat oleh 2 orang. Pengujian permeabilitas terjadi penurunan sebesar 3,65% lebih rendah dari SNI yang syarat maksimum 6,5%
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