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Shear Behavior of Concrete Beams Strengthened with CFRP Grid and PCM Shotcrete CFRP格栅与PCM喷射混凝土加固混凝土梁的抗剪性能
EPI International Journal of Engineering Pub Date : 2019-06-27 DOI: 10.25042/EPI-IJE.022019.02
A. Amiruddin
{"title":"Shear Behavior of Concrete Beams Strengthened with CFRP Grid and PCM Shotcrete","authors":"A. Amiruddin","doi":"10.25042/EPI-IJE.022019.02","DOIUrl":"https://doi.org/10.25042/EPI-IJE.022019.02","url":null,"abstract":"The results of an experimental and analytical study of the shear behavior of damaged or under-strength concrete beams strengthened with carbon fiber reinforced plastics (CFRP) grid and polymer cement mortar (PCM) shotcrete describes in this paper. The aim of this study is to evaluate shear performances of reinforced concrete beams retrofitted by using PCM shotcrete and CFRP grid. Four concrete beams reinforced internally with steel and externally with both PCM and CFRP grid (longitudinal direction used CR-10 and transversal direction used CR-6) applied to the specimens were tested under three-point bending. The shear failure is initiated by a major diagonal crack within the beam shear span. This diagonal crack extended horizontally at the level of the CFRP grid. Results show that PCM shotcrete with CFRP grid is very effective for shear strengthening. Increases in strength of 140% for PGB over the RCB as control, un-retrofitted beams were noted.","PeriodicalId":387754,"journal":{"name":"EPI International Journal of Engineering","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133736676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Multi-Objective Optimization of Variable-Stiffness Composites Fabricated by Tailored Fiber Placement Machine 定制纤维贴片机制备变刚度复合材料的多目标优化
EPI International Journal of Engineering Pub Date : 2019-05-31 DOI: 10.25042/EPI-IJE.022019.04
S. Honda
{"title":"Multi-Objective Optimization of Variable-Stiffness Composites Fabricated by Tailored Fiber Placement Machine","authors":"S. Honda","doi":"10.25042/EPI-IJE.022019.04","DOIUrl":"https://doi.org/10.25042/EPI-IJE.022019.04","url":null,"abstract":"A multi-objective optimization method for the laminated composite fabricated by a tailored fiber placement machine that is an application of embroidering machine is presented. The mechanical properties of composite with curvilinear fibers including stiffness, volume fraction, and density are variable depending on curvatures of fibers. The present study first measures the relation between curvatures and mechanical properties. The measured results indicate that the stiffness of composite decreases linearly as the curvature increases. Then, the obtained relation is applied to the multi-objective optimization where the maximum principal strain and magnitude of curvature are employed as objective functions. Obtained Pareto optimum solutions are widely distributed ranging from the solutions with curvilinear fibers to those with straight fibers, and the curvilinear fiber has still advantages over straight fiber even its weakened stiffness.","PeriodicalId":387754,"journal":{"name":"EPI International Journal of Engineering","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123741357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Free Vibration Analysis of L-Shaped Folded Thin Plates l型折叠薄板的自由振动分析
EPI International Journal of Engineering Pub Date : 2019-05-31 DOI: 10.25042/EPI-IJE.022019.12
K. Sekine
{"title":"Free Vibration Analysis of L-Shaped Folded Thin Plates","authors":"K. Sekine","doi":"10.25042/EPI-IJE.022019.12","DOIUrl":"https://doi.org/10.25042/EPI-IJE.022019.12","url":null,"abstract":"Free vibration analysis of L-shaped folded thin plates having various boundary conditions is presented. Vibration properties of the folded plates are analyzed by means of the Ritz method. Displacement functions satisfying the geometric boundary conditions are assumed in the form of double power series. The interconnection of plate elements of the folded plates is defined by translational and rotational coupling springs. The generalized eigenvalue problem, which is derived by means of minimizing the energy functional, is solved to determine the natural frequencies and mode shapes. The accuracy and validity of the present solutions are demonstrated through convergence studies and comparisons with the results from the literature and FEM (finite element method) analysis solutions. Numerical results are presented for different conditions, such as width ratio, length ratio and the four types of boundary condition.","PeriodicalId":387754,"journal":{"name":"EPI International Journal of Engineering","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122068868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mathematical Modeling in Combining Photovoltaic and Thermoelectric Generator using a Spectrum Splitter 利用分频器组合光伏和热电发电机的数学建模
EPI International Journal of Engineering Pub Date : 2019-05-31 DOI: 10.25042/EPI-IJE.022019.13
H. Hariyanto, M. Mustofa, Z. Djafar, W. H. Piarah
{"title":"Mathematical Modeling in Combining Photovoltaic and Thermoelectric Generator using a Spectrum Splitter","authors":"H. Hariyanto, M. Mustofa, Z. Djafar, W. H. Piarah","doi":"10.25042/EPI-IJE.022019.13","DOIUrl":"https://doi.org/10.25042/EPI-IJE.022019.13","url":null,"abstract":"The experimental stages of converting solar energy into electrical energy in Photovoltaic and Thermoelectric Generator (PV-TEG) hybird ​​takes a long time. Modeling is one approach to find out the initial data before conducting experiments leading to minimize design errors, time and budget. A mathematical model is created to analyze the performance of a PV-TEG hybrid module. Modeling is performed as an electrical circuit equivalent to Kirchoff's Curent Law (KCL) by deriving several equations corresponding to the characteristics of each module. Type of PV is amorphous Silicon (a-Si), while TEG is Bismuth Telluride (Bi2Te3). The AM1.5D standard solar spectrum is splitted its wavelength spectrum using hot mirror, where the wavelengths of 400-690 nm are transmitted to PV and 690-1150 nm are reflected to TEG. All of PV-TEG hybrid parameters, for example intensity, temperature, and material property are obtained from the specification data of each module. As a results, the maximum total power is 0.0437 W with 5.1% its efficiency. ","PeriodicalId":387754,"journal":{"name":"EPI International Journal of Engineering","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125584990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Autonomy Stemmer Algorithm for Legal and Illegal Affix Detection use Finite-State Automata Method 使用有限状态自动机方法进行合法和非法词缀检测的自主词干算法
EPI International Journal of Engineering Pub Date : 2019-05-31 DOI: 10.25042/EPI-IJE.022019.09
Ana Tsalisatun Ni'mah, D. Suryaningrum, A. Arifin
{"title":"Autonomy Stemmer Algorithm for Legal and Illegal Affix Detection use Finite-State Automata Method","authors":"Ana Tsalisatun Ni'mah, D. Suryaningrum, A. Arifin","doi":"10.25042/EPI-IJE.022019.09","DOIUrl":"https://doi.org/10.25042/EPI-IJE.022019.09","url":null,"abstract":"Stemming is the process of separating words from their affixes to get a basic word. Stemming is generally used when preprocessing in text-based applications. Indonesian Stemming has developed research which is divided into two types, namely, stemming without dictionaries and stemming using dictionaries. Stemming without dictionaries has a disadvantage in the results of removal of affixes which are sometimes inappropriate so that it results in over stemming or under stemming, while stemming using dictionaries has a disadvantage during the stemming process which is relatively long and cannot eliminate affixes to compound words. This study proposes a new stemming algorithm without a dictionary that is able to detect legal and illegal affixes in Indonesian using the Finite-State Automata method. The technique used is rule-based Stemmer based on Indonesian language morphology with Regular Expression. Test results were carried out using 118 news documents with 15792 words. The first test results on the autonomy stemmer algorithm obtain the correct word which amounts to 10449 of the total number of words processed, which means getting an average accuracy of 66%. The second test results on the autonomy stemmer algorithm get the results of the average speed of 0.0051 seconds. The third test result is being able to do the elimination of affixes to compound words.","PeriodicalId":387754,"journal":{"name":"EPI International Journal of Engineering","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123249373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Characteristics of Active Carbon from Utilization of Red Chili Trees (Capsicum annuum L) 红辣椒树(Capsicum annuum L)利用中活性碳的特性
EPI International Journal of Engineering Pub Date : 2019-02-28 DOI: 10.25042/EPI-IJE.022019.03
Ni Made Dwidiani, P. Sunu, Gusti Ngurah Nitya Santhiarsa
{"title":"Characteristics of Active Carbon from Utilization of Red Chili Trees (Capsicum annuum L)","authors":"Ni Made Dwidiani, P. Sunu, Gusti Ngurah Nitya Santhiarsa","doi":"10.25042/EPI-IJE.022019.03","DOIUrl":"https://doi.org/10.25042/EPI-IJE.022019.03","url":null,"abstract":"This work studies the use of red chilli tree (capsicum anuumm L) waste as material of activated carbon and examines the morphological structure and elemental composition of the activated chili trees. The morphological structure was measured at TekMIRA (Pusat Penelitian dan Pengembangan Teknologi Mineral dan Batubara, Bandung) by using the scanning electron microscope (SEM), and the composition of the elements of carbon, hydrogen, nitrogen and ash is determined by the ultimate testing analysis with the ASTM D5373 standard. In the testing procedure, activated carbon is made from red chili tree waste by dehydration with a temperature of 2000 C for 1 hour and carbonized with a temperature of 3750 C for 1 hour. Then, the chemical activation (NaOH) is made in variation of concentration of 1%, 3%, and 5% with soaked time 24 hours, and dried at 2000 C for one hour. The carbonization at a concentration of 1% (NaOH) gave the best result on activated carbon from red chili trees.","PeriodicalId":387754,"journal":{"name":"EPI International Journal of Engineering","volume":"122 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133183921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Influences of Lengthening Dimension of Ro-Ro Ferry Toward the Considerations of Hydrodynamics Characteristic and Loading Capacity Aspect 滚装轮渡加长尺寸对考虑其水动力特性和承载能力方面的影响
EPI International Journal of Engineering Pub Date : 2019-02-28 DOI: 10.25042/EPI-IJE.022019.08
Andi Rachmianty, S. Baso, S. Asri
{"title":"The Influences of Lengthening Dimension of Ro-Ro Ferry Toward the Considerations of Hydrodynamics Characteristic and Loading Capacity Aspect","authors":"Andi Rachmianty, S. Baso, S. Asri","doi":"10.25042/EPI-IJE.022019.08","DOIUrl":"https://doi.org/10.25042/EPI-IJE.022019.08","url":null,"abstract":"The ferry business has become an important business segment for ship designers, builders and operators. Therefore, many ways have been done in order to increase ferry business through the proper design or converting ships by lengthening. This research is focused on the influences of lengthening a Ro-Ro ferry to hydrodynamics characteristic and loading capacity aspects. Moreover, the ships also are fixed in the same width and draft dimensions. The difference of the Ro-Ro ferries length is indicated by the addition of one column of car space where one column car space is given by car size including distance between car columns spaces which is an increment of every 5.88 meter. The total resistances of Ro-Ro ferries are obtained by ship model experiment in towing tank. There are 4 ship models that are made. The lengthening a Ro-Ro ferry is described into non-dimensional parameter by the ratio of ship length and displacement volume (L/V1/3). The hydrodynamics and the loading capacity of carried car aspects could be described into the ratio of resistance and loading capacity of carried car (RT/SUK) with ship speed. The research result shows that the lengthening of a Ro-Ro ferry affects on total resistance, speed, and loading capacity of carried car. The increase of total resistance is caused by higher residual resistance at high speeds and this is experienced by small length size. Therefore by lengthening the Ro-Ro ferry it could reduce total resistance in the same speed especially the residuary resistance but eventhough lengthening Ro-Ro ferry the effective speed should be considered. In additions, the effective speed for actual ships dimension in the same Rt/SUK 0.05 i.e. B5L10 is about 13.85 knot, B5L11 14.33 knot, B5L12 14.94 knot, and B5L13 15.45 knot respectively.","PeriodicalId":387754,"journal":{"name":"EPI International Journal of Engineering","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114604717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Manufacture of Continuous Glass Fiber / Polylactic Acid (PLA) Composite and Its Properties 连续玻璃纤维/聚乳酸(PLA)复合材料的制备及其性能
EPI International Journal of Engineering Pub Date : 2019-02-28 DOI: 10.25042/EPI-IJE.022019.01
J. Roh, W. Lee
{"title":"Manufacture of Continuous Glass Fiber / Polylactic Acid (PLA) Composite and Its Properties","authors":"J. Roh, W. Lee","doi":"10.25042/EPI-IJE.022019.01","DOIUrl":"https://doi.org/10.25042/EPI-IJE.022019.01","url":null,"abstract":"The continuous glass fiber reinforced polylactic acid (PLA) prepreg was manufactured by direct melt impregnation. The mechanical and thermal properties of PLA prepreg were observed. The properties of PLA prepreg were compared with the neat PLA and the injection molded glass fiber/PLA composite. The PLA prepreg having a fiber volume fraction of 27.7 % shows well enhanced tensile strength of 331.1 MPa, flexural strength of 528.6 MPa, and flexural modulus of 24.0 GPa. The enhancement in the heat deflection temperature (HDT) and the crystallinity were also observed. The fracture interface was inspected by FE-SEM. The degree of impregnation as a function of pulling speed was measured. The degree of impregnation at the pulling speed of 5 m/min reached over 90 % in this research.","PeriodicalId":387754,"journal":{"name":"EPI International Journal of Engineering","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116904909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Renewable Energy Developments in Indonesia 印度尼西亚的可再生能源发展
EPI International Journal of Engineering Pub Date : 2019-02-28 DOI: 10.25042/EPI-IJE.022019.15
Muhammad Zulkifli, Ryoji Tohyama, T. Tohyama, K. Maeda
{"title":"Renewable Energy Developments in Indonesia","authors":"Muhammad Zulkifli, Ryoji Tohyama, T. Tohyama, K. Maeda","doi":"10.25042/EPI-IJE.022019.15","DOIUrl":"https://doi.org/10.25042/EPI-IJE.022019.15","url":null,"abstract":"Replacing fossil fuel use with renewable energy is an effective way to reducing level of carbon emission and one of solution facing the growth demand of electricity in Indonesia, especially in the rural areas where the national electricity grid is not yet installed. In light of the perspective of promoting the renewable energy, we plan to use palm oil as biofuels for power generation activities that will help to supply electricity for the local community consumption in Indonesia. This paper is a preliminary study that aims to overview the progress of renewable energy development in Indonesia, also to introduce background of our plan as one of the solutions in dealing to with Indonesia`s current somewhat limited renewable energy usage condition. Based on expected outputs of our plan, this study tries to discuss our concepts which is to promote of Local Production Energy for Local Consumption and its application which will lead to development of one Smart Energy Community, as one of the key points to developing a Smart City.","PeriodicalId":387754,"journal":{"name":"EPI International Journal of Engineering","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116784025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
The Effect of Using Different Elastic Moduli on Vibration of Laminated CFRP Rectangular Plates 不同弹性模量对叠合CFRP矩形板振动的影响
EPI International Journal of Engineering Pub Date : 2019-02-28 DOI: 10.25042/EPI-IJE.022019.05
Y. Narita, M. Innami, D. Narita
{"title":"The Effect of Using Different Elastic Moduli on Vibration of Laminated CFRP Rectangular Plates","authors":"Y. Narita, M. Innami, D. Narita","doi":"10.25042/EPI-IJE.022019.05","DOIUrl":"https://doi.org/10.25042/EPI-IJE.022019.05","url":null,"abstract":"This paper deals with effects of using different sets of material constants on the natural frequencies of laminated composite rectangular plates. The plate is symmetrically laminated by thin layers composed of recently developed carbon fiber reinforced plastic (CFRP) materials. Numerical experiments are conducted by using a semi-analytical solution based on the thin plate theory and the lamination theory. The displacements are assumed to accommodate any combination of classical boundary conditions. The material property is expressed by a set of four elastic constants, and some typical sets of values are cited from the recent literature. Furthermore, a new standard set of discretized constants is proposed to uncover the underlying characteristics of the existing constants. The convergence study is carried out first, and the lowest five natural frequencies are calculated for five sets of classical boundary conditions including totally free through totally clamped cases. Next, a new definition of frequency parameters is introduced to promote more physically meaningful comparison among the obtained results, and the effect of using slightly different constants is clarified for unified comparison and insights. It is also discussed to derive approximate frequency formulas by linear regression analysis and to test accuracy of the formulas.","PeriodicalId":387754,"journal":{"name":"EPI International Journal of Engineering","volume":"234 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133364097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
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