Tokuyama College of Technology

Tokuyama, Japan

Tokuyama College of Technology

Tokuyama, Japan
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Hara T.,Tokuyama College of Technology
Procedia Engineering | Year: 2017

In this paper, the numerical analysis of the reinforced concrete (R/C) cylindrical shell with hoop edge beams was performed by using the nonlinear finite element method. R/C shell with free edges must be stiffened by the edge beam. From the numerical results of the previous papers, the minimum size of the edge beam was placed on both hoop edges as the beam having the maximum ratio of the strength to the weight. There were several connecting method between R/C cylindrical panel and the hoop edge beam. Three kinds of connecting position between R/C shell and the edge beam were considered. One was the concentric connection of R/C shell and the beam (Type C). The second one was the shell connected at the top of the beam (Type L). The third one was the shell connected with the bottom of the beam (Type U). R/C shell was pin supported on the meridian and free on the hoops. Quasi uniformly distributed load was applied to the model. In numerical analysis, both shells and beams were modeled by solid elements. The reinforcements were represented by the steel sheets. To represents the nonlinear behavior of R/C shell elements, combined material and geometric nonlinearities were taken into account. The relation between an applied load and deflections as well as crack propagations was investigated. The ultimate strength of the structure was also obtained. From the numerical analyses, concentric connection of R/C shell and the beam (Type C) was efficient. However, R/C shell connecting with the top of the beam (Type L) showed better performance and was better connection method considering the finishing of the structure and the design demand. © 2017 The Authors.


Tsutaoka T.,Hiroshima University | Kasagi T.,Tokuyama College of Technology | Yamamoto S.,University of Hyogo | Hatakeyama K.,University of Hyogo
Applied Physics Letters | Year: 2013

We have studied the relative complex permittivity (r r′- ir″) of copper granular composite materials containing coagulated Cu particles in the microwave range as well as the electrical conductivity. The insulator to metal transition was observed at the percolation threshold c 16.0 vol. . The enhancement of permittivity in the insulating state can be described by the Effective Cluster Model. Above the percolation threshold c, it was found that the Cu granular composites show negative permittivity spectra below a characteristic frequency f0 indicating the low frequency plasmonic state. Characteristic frequency tends to increase with particle content. © 2013 AIP Publishing LLC.


Hara T.,Tokuyama College of Technology
Computers and Concrete | Year: 2011

In this paper, FEM procedure is applied to the static and dynamic analyses of R/C structures. Simple R/C shell structure is solved by using FEM procedures and the experimental evaluations are performed to represent the applicability of FEM procedure to R/C structures. Also, R/C columns are analyzed numerically and experimentally. On the basis of these results, FEM procedures are applied to the R/C cooling tower structures assembled by huge R/C shell structure and a lot of discrete R/C columns. In this analysis, the parallel computing procedures are introduced into these analyses to reduce the computational effort. The dynamic performances of R/C cooling tower are also solved by the application of parallel computations as well. From the numerical analyses, the conventional FEM procedures combined with computational technologies enables us to design the huge R/C structures statically and dynamically.


Yanagisawa H.,Tokuyama College of Technology
Proceedings of the 2012 15th International Conference on Network-Based Information Systems, NBIS 2012 | Year: 2012

On most PaaS (Platform as a Service) systems, applications that are developed on a server are executed on the same server. As such, portability of these applications is not considered as is the case with a WebOS. This paper proposes a Web-based Software Development Environment (WSDE) for developing applications. The WSDE provides a web-based development environment for software applications that can be executed on a server, local and/or embedded machine. Thus, it is unnecessary for each developer to install software for developing applications on the local system or to set the environment variables of the local system. With the WSDE, developers can use the same environment via a Web browser anytime, anywhere. Moreover, this paper proposes a renewable system for embedded systems. To develop application programs for embedded systems, application developers have to prepare a software development environment for each target embedded system. The WSDE allows software developers to develop software applications on a server using a virtual machine. © 2012 IEEE.


Yanagisawa H.,Tokuyama College of Technology
Proceedings - IEEE 29th International Conference on Advanced Information Networking and Applications Workshops, WAINA 2015 | Year: 2015

Cloud computing has become very popular in recent years. Various SaaS, PaaS and IaaS systems for collaborative software development have been proposed. We also have proposed a PaaS system that delivers both a server-side development and server-side execution environment for character user interface applications that can be executed on the server machine and a server-side development and client-side execution environment for graphical user interface applications that can be executed on the client machine. Our previous system allows user to develop and execute software on a web-browser. But our previous system assumes standard PC to execute graphical user interface applications. The graphical user interface applications that are developed in our previous system cannot be executed on mobile devices such as smart phone and tablet. Therefore this paper proposes an extension of web-based software development environment. By the extension, our system allows software developers to implement software for mobile devices. © 2015 IEEE.


Hara T.,Tokuyama College of Technology
Journal of the International Association for Shell and Spatial Structures | Year: 2016

The stress distributions and the ultimate strength of a reinforced concrete (R/C) cooling tower shell were investigated under the conditions of uneven settlement of column supports. In numerical analyses, the finite element method was adopted. R/C cooling tower shell and columns were modeled by solid elements and steel sheet elements representing the reinforcements. The behaviour of two types of supporting systems, that were 32 V column and 32 vertical column systems, was investigated and was compared under the loading condition of the self weight. From the numerical analysis, the stress concentration was arisen near the connections between the unsettled column and the lintel and the ultimate strength was reduced by uneven settlements. © Copyright 2016 by the International Association for Shell and Spatial Structures (IASS).


Yanagisawa H.,Tokuyama College of Technology
Proceedings - 26th IEEE International Conference on Advanced Information Networking and Applications Workshops, WAINA 2012 | Year: 2012

Cloud computing, which has become very popular in recent years, can be categorized as SaaS (Software as a Service), PaaS (Platform as a Service), or IaaS (Infrastructure as a Service). PaaS provides a platform similar to a software development environment over a network. On most PaaS systems, applications that are developed on a server, are executed on the same server. As such, portability of these applications is not considered. This paper proposes a Server-side Development and Client-side Execution (SDCE) Environment for developing GUI applications. The SDCE provides a Web-based software development environment for GUI applications that can be executed on a local machine. © 2012 IEEE.


Hashimoto K.-I.,Tokuyama College of Technology
Zairyo/Journal of the Society of Materials Science, Japan | Year: 2016

The stress intensity factor for the crack under mode III loading in the three dimensional elastic body is analyzed numerically by the finite element method. After obtaining the energy release rates, these energy release rates are converted into stress intensity factors. The method considering the difference of the strain energy between the analysis model and the crack extension model is used for the approach obtained the energy release rate in this study. The ratio of the model width(W), the model thickness(T) and the model length(L) for the basic finite element model are in the ratio 1:1:4. After the analytical accuracy is investigated by three point bending model with the mode I loading, the stress intensity factor for mode III loading is analyzed by the same basic finite element model with the different boundary condition. As a result, the result for mode I loading using the basic model agrees well with the two dimensional analytical solution. However, the result for mode III loading has the some differences for the two dimensional exact solution. Therefore, the numerical analyses of the model with different thicknesses are conducted for mode III loading. As a result of those analyses, it is clear that the numerical results approach the exact solution with the increase of thickness length. That is to say, the model thickness needs about twenty times as long as the model width to obtain the result close to two dimensional exact solution by the three dimensional analysis. However, the model length(L) requires eight times(L=8W) of the model width(W) in connection with the influence of the boundary condition. © 2016 The Society of Materials Science, Japan.


Hara T.,Tokuyama College of Technology
Advanced Materials Research | Year: 2014

This paper represented the numerical analysis of the tunnel lining which was used for maintaining the old tunnel. The tunnel lining was made from FRP corrugated sheet that supported the lining concrete in the tunnel and flowed the water or / and the moisture swept on the tunnel surface. The FRP sheet was supported by the anchor bolts. In numerical analysis, the finite element degenerate shell was adopted to represent the FRP behavior. Firstly, the proposed FRP sheet was adopted and the distribute load equivalent to the concrete peeled from the tunnel lining was applied and the stresses of the FRP sheet, the tensile force of bolts and the deflection of FRP sheet were investigated. Then, secondary, the FRP corrugated sheet with longitudinal cover strip was investigated. From the numerical analysis, the effectiveness of the FRP corrugated sheet was confirmed. © (2014) Trans Tech Publications, Switzerland.


Hara T.,Tokuyama College of Technology
ISEC 2015 - 8th International Structural Engineering and Construction Conference: Implementing Innovative Ideas in Structural Engineering and Project Management | Year: 2015

Reinforced Concrete (R/C) shell has been constructed to cover large public spaces and large industrial buildings. RC shell is originally a continuous structure and shows the large load bearing capacity. To apply these structures to such purpose, the structure is cut at any particular portion and loses their continuum properties. Therefore, edge beams must be placed to avoid the stress concentration and a local failure. In this paper, R/C cylindrical shell with edge beam on meridional free edges was analyzed by use of FEM. RC shell had 960 × 960 mm plan and the thickness was 10 mm. The radius and the depth of the shell were 688 mm and 190 mm, respectively. As the edge beam, three kinds of rectangular beams, which had 2 cm width and 4 cm depth, were arranged. One was connected to the shell at the gravity center of the beam and the others were connected at the bottom or the top of the beam. From the numerical analyses, the deformation and the stress distribution of the shell mentioned above were analyzed precisely. The shell connected with the gravity center of the beam showed the smooth deformation and the stress distributions. Copyright © 2015 ISEC Press.

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