Instytut Podstawowych Problemów Techniki
Polskiej Akademii Nauk

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Yuki Chikahiro

Shinshu University (JP)


Ostatnie publikacje
1.  Ario I., Yamashita T., Chikahiro Y., Nakazawa M., Fedor K., Graczykowski C., Pawłowski P., Structural analysis of a scissor structure, BULLETIN OF THE POLISH ACADEMY OF SCIENCES: TECHNICAL SCIENCES, ISSN: 0239-7528, DOI: 10.24425/bpasts.2020.134623, Vol.68, No.6, pp.1-14, 2020

Streszczenie:
This paper presents equilibrium mechanics and a finite element model for analysing a scissor structure that contains pivots with zero bending stiffness representing structural instability. The pivot at the centre of each structural unit, which is a feature of scissor structures, can be used to transfer the displacement between the units. It cannot, however, transfer the rotation between these units, and the angular stiffness must be considered independently for each unit. To construct a general model of the scissor structure, a scissor unit was developed using the left and right boundary connections of adjacent units to simulate a periodically symmetric structure. The proposed method allows us to obtain an accurate distribution of the internal forces and deflections without the use of special elements to account for central pivots.

Słowa kluczowe:
scissor structure, deployable structure, smart bridge, scissors finite element, equilibrium mechanics

Afiliacje autorów:
Ario I. - Hiroshima University (JP)
Yamashita T. - Hiroshima University (JP)
Chikahiro Y. - Shinshu University (JP)
Nakazawa M. - Tohoku Gakuin University (JP)
Fedor K. - IPPT PAN
Graczykowski C. - IPPT PAN
Pawłowski P. - IPPT PAN
100p.
2.  Chikahiro Y., Ario I., Pawłowski P., Graczykowski C., Holnicki-Szulc J., Optimization of reinforcement layout of scissor-type bridge using differential evolution algorithm, Computer-Aided Civil and Infrastructure Engineering, ISSN: 1093-9687, DOI: 10.1111/mice.12432, Vol.34, No.6, pp.523-538, 2019

Streszczenie:
Scissors mechanisms are commonly used in safety engineering during the construction of temporary structures, owing to their inherent advantages of foldability, transformability, and reusability. We effectively utilized these scissors mechanism features to develop a lightweight, deployable emergency Mobile Bridge (MB) based on optimization, and control of the folding structure. Here, we discuss the problems of optimal reinforcement layout for the MB by formulating and solving three optimization problems, namely: (a) the load capacity maximization problem, (b) the weight minimization problem, and (c) coupling the load capacity maximization problem and the weight minimization problem. The potential benefits resulting from the application of reinforcement were evaluated using a combination of finite element analysis and an optimization algorithm based on the differential evolution method. The results demonstrate the significant positive influence of the additional reinforcing members. In particular, the limit load was increased by over 10 times, while the weight was decreased to approximately half. The proposed methodology enabled the development of a substantially improved version of the MB characterized by a higher load capacity and lower weight in comparison to the initial bridge design.

Afiliacje autorów:
Chikahiro Y. - Shinshu University (JP)
Ario I. - Hiroshima University (JP)
Pawłowski P. - IPPT PAN
Graczykowski C. - IPPT PAN
Holnicki-Szulc J. - IPPT PAN
140p.
3.  Chikahiro Y., Ario I., Nakazawa M., Ono S., Holnicki-Szulc J., Pawłowski P., Graczykowski C., Watson A., Experimental and numerical study of full-scale scissor type bridge, Automation in Construction, ISSN: 0926-5805, DOI: 10.1016/j.autcon.2016.05.007, Vol.71, pp.171-180, 2016

Streszczenie:
Mobile Bridge™ is a deployable bridge that uses a scissors mechanism to achieve its useful structural form. The bridge has a compact size in its undeployed state and can be transported easily to where it is needed. Its rapid deployment makes this type of bridge very useful in areas struck by natural disasters by enabling vehicles to cross terrain that has been made impassable. In previous research, experiments and analyses were conducted on a small-scale bridge designed for pedestrians. In order to consider a bridge of increased size, it is necessary to assess whether design and analysis techniques of the small scale bridge are applicable to the full-scale one. In this paper, we consider a full-scale deployable bridge with a lower deck and two scissor units, that allows for a light vehicle to pass across. We have carried out a light vehicle loading test in order to investigate its basic structural characteristics. Furthermore, the paper presents the theoretical design method and numerical models based on the experimental work followed by validation and comparison with the obtained experimental values.

Słowa kluczowe:
Full-scale Mobile Bridge, Scissor type of emergency bridge, Scissors mechanism, Vehicle loading test

Afiliacje autorów:
Chikahiro Y. - Shinshu University (JP)
Ario I. - Hiroshima University (JP)
Nakazawa M. - Tohoku Gakuin University (JP)
Ono S. - Japan Construction Method and Machinery Research Institute (JP)
Holnicki-Szulc J. - IPPT PAN
Pawłowski P. - IPPT PAN
Graczykowski C. - IPPT PAN
Watson A. - Loughborough University (GB)
40p.

Lista rozdziałów w ostatnich monografiach
1. 
Chikahiro Y., Ario I., Nakazawa M., Ono S., Holnicki-Szulc J., Pawłowski P., Graczykowski C., Mobile and Rapidly Assembled Structures IV, rozdział: An Experimental Study On The Design Method Of A Real-sized Mobile Bridge For A Moving Vehicle, N. De Temmerman,Vrije, C.A. Brebbia, WITPress, pp.93-106, 2014

Prace konferencyjne
1.  Chikahiro Y., Ario I., Pawłowski P., Graczykowski C., Nakazawa M., Holnicki-Szulc J., Ono S., Dynamics of the scissors-type Mobile Bridge, EURODYN 2017, X International Conference on Structural Dynamics, 2017-09-10/09-13, Rome (IT), DOI: 10.1016/j.proeng.2017.09.339, Vol.199, pp.2919-2924, 2017

Streszczenie:
We have experienced many times a phenomenon in which a bridge is washed away due to a typhoon, heavy rain in the rainy season, localized torrential rain, tsunami, and other flood disasters, or in which a bridge is damaged by an earthquake or a tremor. There is accordingly increasing demand for new technology and science to restore bridges that have been washed away or damaged. The paper presents a new type of emergency bridge, called Mobile Bridge™(MB), which can be quickly constructed in case of damages after a natural disaster. The concept of the bridge is based on the application of scissor-type mechanism, which provides its rapid deployment. Up to now several experimental MBs of different size were constructed and tested. The presented research reviews fundamental numerical and experimental results for the MB version 4.0 (MB4.0). Experimental testing included strain and acceleration measurements in free and forced loading conditions. From these results, it was possible to estimate basic dynamic characteristics of the bridge. Besides, in order to provide a basis for development of new construction methods for structural reinforcement and suppression of vibrations, various numerical analyses were conducted. The conducted research allows for a better and safer design of the movable and foldable full-scale bridge, the MB.

Słowa kluczowe:
deployable bridge, scissors-type bridge, emergency bridge, light-weight structure, temporary bridge

Afiliacje autorów:
Chikahiro Y. - Shinshu University (JP)
Ario I. - Hiroshima University (JP)
Pawłowski P. - IPPT PAN
Graczykowski C. - IPPT PAN
Nakazawa M. - Tohoku Gakuin University (JP)
Holnicki-Szulc J. - IPPT PAN
Ono S. - Japan Construction Method and Machinery Research Institute (JP)
20p.
2.  Chikahiro Y., Ario I., Adachi K., Shimizu S., Pawłowski P., Graczykowski C., Holnicki-Szulc J., Fundamental study on dynamic property of deployable emergency bridge using scissors mechanism, Footbridge Berlin 2017, 6th International Footbridge Conference, 2017-09-06/09-08, Berlin (DE), DOI: 10.24904/footbridge2017.09352, pp.1-6, 2017

Streszczenie:
The paper presents a new type of emergency bridge, which can be quickly constructed in case of damages after a natural disaster. The concept of the bridge is based on the application of scissor-type mechanism, which provides its rapid deployment. In case of deployable structures apart from static analysis of different configurations of expansion, it is very important to investigate the dynamic behavior of the system. High compliance and flexibility of the scissors-type bridge may influence user's comfort and safety in case of heavy dynamic loads such as human induced impacts, wind gusts or earthquakes. Up to now, the authors constructed several types of the experimental MBs. The presented research reviews fundamental numerical and experimental results for the Mobile Bridge 4.0. Experimental testing included strain and acceleration measurements in free and forced loading conditions. From these results, it was possible to estimate basic mechanics characteristics, that is statics and dynamic property, of the bridge. The conducted research allows for a better and safer design of the structure of the Mobile Bridge.

Słowa kluczowe:
Deployable Bridge, Scissors-type bridge, Emergency Bridge, Dynamic property, Natural frequency, Acceleration measurement

Afiliacje autorów:
Chikahiro Y. - Shinshu University (JP)
Ario I. - Hiroshima University (JP)
Adachi K. - Hiroshima University (JP)
Shimizu S. - Shinshu University (JP)
Pawłowski P. - inna afiliacja
Graczykowski C. - inna afiliacja
Holnicki-Szulc J. - IPPT PAN

Abstrakty konferencyjne
1.  Chikahiro Y., Ario I., Pawłowski P., Graczykowski C., Shimizu S., Numerical Optimization of Deployable Scissors Structure with Reinforcing Chord Members, SolMech 2018, 41st SOLID MECHANICS CONFERENCE, 2018-08-27/08-31, Warszawa (PL), pp.370-371, 2018
2.  Chikahiro Y., Ario I., Adachi K., Shimizu S., Zenzai S., Pawłowski P., Graczykowski C., Holnicki-Szulc J., Fundamental study on dynamic property of scissoring bridge for disaster relief, ENOC 2017, 9th European Nonlinear Dynamics Conference, 2017-06-25/06-30, Budapest (HU), pp.1-2, 2017

Streszczenie:
The world has seen many kinds of natural disasters, which have critically influenced the residents' lives by causing damage to infrastructure. To realize rapid rescue efforts in an emergency situation, we propose a deployable emergency bridge, called Mobile Bridge TM [1], based on the theory of foldable structures[2]and the concept of Multi-Folding Microstructures (MFM)[3]. The current research presents the fundamental,numerical and experimental results obtained for the pedestrian and vehicle Mobile Bridges. In this paper, it is considered the localized linearization problem with the fixed an angle although this bridge contains a geometrical nonlinearity of scissors structure. Additionally, a seismic response analysis is conducted for the case where the Mobile Bridge is used in the disaster area as an emergency bridge. This allows for a better and safer structural design of the Mobile Bridge, which is patented in [4],[5].

Afiliacje autorów:
Chikahiro Y. - Shinshu University (JP)
Ario I. - Hiroshima University (JP)
Adachi K. - Hiroshima University (JP)
Shimizu S. - Shinshu University (JP)
Zenzai S. - Shinshu University (JP)
Pawłowski P. - IPPT PAN
Graczykowski C. - IPPT PAN
Holnicki-Szulc J. - IPPT PAN
3.  Chikahiro Y., Ario I., Pawłowski P., Graczykowski C., Nakazawa M., Holnicki-Szulc J., Ono S., Dynamics of the scissors-type Mobile Bridge, EURODYN 2017, X International Conference on Structural Dynamics, 2017-09-10/09-13, Rome (IT), pp.199-199, 2017
4.  Chikahiro Y., Ario I., Adachi K., Shimizu S., Pawłowski P., Graczykowski C., Holnicki-Szulc J., Fundamental study on dynamic property of deployable emergency bridge using scissors mechanism, Footbridge Berlin 2017, 6th International Footbridge Conference, 2017-09-06/09-08, Berlin (DE), pp.1-6, 2017

Streszczenie:
The paper presents a new type of emergency bridge, which can be quickly constructed in case of damages after a natural disaster. The concept of the bridge is based on the application of scissor-type mechanism, which provides its rapid deployment. In case of deployable structures apart from static analysis of different configurations of expansion, it is very important to investigate the dynamic behavior of the system. High compliance and flexibility of the scissors-type bridge may influence user's comfort and safety in case of heavy dynamic loads such as human induced impacts, wind gusts or earthquakes. Up to now, the authors constructed several types of the experimental MBs. The presented research reviews fundamental numerical and experimental results for the Mobile Bridge 4.0. Experimental testing included strain and acceleration measurements in free and forced loading conditions. From these results, it was possible to estimate basic mechanics characteristics, that is statics and dynamic property, of the bridge. The conducted research allows for a better and safer design of the structure of the Mobile Bridge.

Słowa kluczowe:
Deployable Bridge, Scissors-type bridge, Emergency Bridge, Dynamic property, Natural frequency, Acceleration measurement

Afiliacje autorów:
Chikahiro Y. - Shinshu University (JP)
Ario I. - Hiroshima University (JP)
Adachi K. - Hiroshima University (JP)
Shimizu S. - Shinshu University (JP)
Pawłowski P. - inna afiliacja
Graczykowski C. - inna afiliacja
Holnicki-Szulc J. - inna afiliacja
5.  Chikahiro Y., Ario I., Holnicki-Szulc J., Pawłowski P., Graczykowski C., A Study on Optimal Reinforcement of Scissor Type of Bridge with Additional Strut Members, ICCEE 2016, International Conference on Civil and Environmental Engineering, 2016-10-17/10-19, Hiroshima (JP), pp.1-2, 2016

Słowa kluczowe:
scissor type of bridge, emergency bridge, strut reinforcement, sectional optimization

Afiliacje autorów:
Chikahiro Y. - Shinshu University (JP)
Ario I. - Hiroshima University (JP)
Holnicki-Szulc J. - IPPT PAN
Pawłowski P. - IPPT PAN
Graczykowski C. - IPPT PAN
6.  Chikahiro Y., Ario I., Nakazawa M., Ono S., Holnicki-Szulc J., Pawłowski P., Graczykowski C., Structural Analysis and Experimental Study for realsized MB Travelable Vehicles, ENOC 2014, 8th European Nonlinear Dynamics Conference, 2014-07-06/07-11, Wiedeń (AT), pp.1-2, 2014

Streszczenie:
Many natural disasters such as earthquakes, floods, torrential rains occur around the world, and we to undertake quick rescue actions. However, there are many recovery problems because of the occurrence of secondary disasters at each rescue worksite.So, from the previous study of optimal structures and control regulation of MFM[1]-[2], we propose a new type of foldable bridge with scissors structure called Mobile Bridge[3]. Applying scissors mechanism to bridge form, Mobile Bridge provides not only mobility but also good structural performance, because the whole bridge can be expand or fold quickly. In this paper, we discuss the vehicles passing test on the real scale Mobile Bridge in order to evaluate the design method and application limits.

Słowa kluczowe:
Mobile Bridge, deployable structures, temporary bridges, scissors-type structures

Afiliacje autorów:
Chikahiro Y. - Shinshu University (JP)
Ario I. - Hiroshima University (JP)
Nakazawa M. - Tohoku Gakuin University (JP)
Ono S. - Japan Construction Method and Machinery Research Institute (JP)
Holnicki-Szulc J. - IPPT PAN
Pawłowski P. - IPPT PAN
Graczykowski C. - IPPT PAN

Patenty
Numer/data zgłoszenia patentowego
Ogłoszenie o zgłoszeniu patentowym
Twórcy
Tytuł
Kraj i Nazwa uprawnionego z patentu
Numer patentu
Ogłoszenie o udzieleniu patentu
pdf
14895015.7
2014-06-17
WO2015193930
2015-12-23
Ario I., Tanaka Y., Chikahiro Y., Nakatani S., Tanikura I., Ono S., Akamatsu T., Sato T., Hanaki S., Nakamura S.
Scissors-type retractable structure
EPO, Hiroshima University, Sankyo Tateyama, Inc., Hoshikei Kinzoku Kogyo Co., Ltd., Japan Construction Machinery and Construction Association, Institute of Fundamental Technological Research Polish Academy of Science
EP3147407
Bulletin 2019/32
2019-08-07



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