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- 저자 : Ayaho Miyamoto (검색결과 7 건)
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Advanced performance evaluation system for existing concrete bridges
Ayaho Miyamoto,Hisao Emoto,Hiroyoshi Asano 사단법인 한국계산역학회 2014 Computers and Concrete, An International Journal Vol.14 No.6
The management of existing concrete bridges has become a major social concern in many developed countries due to the large number of bridges exhibiting signs of significant deterioration. This problem has increased the demand for effective maintenance and renewal planning. In order to implement an appropriate management procedure for a structure, a wide array of corrective strategies must be evaluated with respect to not only the condition state of each defect but also safety, economy and sustainability. This paper describes a new performance evaluation system for existing concrete bridges. The system evaluates performance based on load carrying capability and durability from the results of a visual inspection and specification data, and describes the necessity of maintenance. It categorizes all girders and slabs as either unsafe, severe deterioration, moderate deterioration, mild deterioration, or safe. The technique employs an expert system with an appropriate knowledge base in the evaluation. A characteristic feature of the system is the use of neural networks to evaluate the performance and facilitate refinement of the knowledge base. The neural network proposed in the present study has the capability to prevent an inference process and knowledge base from becoming a black box. It is very important that the system is capable of detailing how the performance is calculated since the road network represents a huge investment. The effectiveness of the neural network and machine learning method is verified by comparing diagnostic results by bridge experts.
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IT-based Bridge Health Monitoring
Ayaho Miyamoto 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
Bridge health monitoring using information technology and sensors is capable of providing more accurate knowledge of bridge performance than traditional strategies. This keynote paper introduces not only an ITbased bridge health monitoring system incorporate with the latest information technologies for lifetime management of existing bridges but also a data collecting system designed for bridge health monitoring.
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An Intelligent bridge with an advanced monitoring system and smart control techniques
Ayaho Miyamoto,Minoru Motoshita 국제구조공학회 2017 Smart Structures and Systems, An International Jou Vol.19 No.6
This paper introduces an approach to the realization of an ICT-based bridge remote monitoring system that enables real-time monitoring and controlled adjustments for unexpected heavy loads and also for damaging earthquakes or typhoons. In this paper, an integrated bridge remote monitoring system called the \"Intelligent Bridge\", which consists of a stand-alone monitoring system (SMS) and a web-based Internet monitoring system(IMS), was developed for not only bridge maintenance but also as an application for a para-stressing bridge system. To verify the possibility of controlling the actual structural performance of an \"Intelligent Bridge\", a model 2-span continuous cable-stayed bridge with adjustable cables was constructed. The experimental results demonstrate that the implemented monitoring system supplies detailed and accurate information about bridge behaviour for further evaluation and diagnosis, and it also opens up prospects for future application of a web-based remote system to actually adjust in-service bridges under field conditions.
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VR-based education system for inspection of concrete bridges
Ayaho Miyamoto,Masa-aki Konno,Tommi Rissanen 한국계산역학회 2006 Computers and Concrete, An International Journal Vol.3 No.1
In this study, a novel education system for inspection of concrete bridges is presented. The new education approach uses virtual reality (VR) and three-dimensional computer graphics (3DCG) in training engineers to become bridge inspection specialists. The slow time-dependent deterioration of concrete bridges can be reproduced on the computer screen in any chosen time frame, thus providing the trainees with illustrative and educative insight into the deterioration problem. In the proposed VR/3DCG approach a three-dimensional model of concrete bridge, including surfaces, viewpoints and walkthrough paths is created. With the help of this virtual bridge model, an experienced bridge inspection specialist teaches the different deterioration phenomena of concrete bridges to the trainees. The new system was tested, and the inspection results from the case bridge showed that in comparison with the traditional Japanese bridge inspection education system, the new system gives better results. In addition to the improvement of quality of bridge inspections, the new VR/3DCG system-based education brings along some other, more intangible benefits.
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Sensitivity analysis of mechanical behaviors for bridge damage assessment
Ayaho Miyamoto,Satoshi Isoda 국제구조공학회 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.41 No.4
The diagnosis of bridge serviceability is carried out by a combination of in-situ visual inspection, static and dynamic loading tests and analyses. Structural health monitoring (SHM) using information technology and sensors is increasingly being used for providing a better estimate of structural performance characteristics rather than above traditional methods. Because the mechanical behavior of bridges with various kinds of damage can not be made clear, it is very difficult to estimate both the damage mode and degree of damage of existing bridges. In this paper, the sensitivity of both static and dynamic behaviors of bridges are studied as a measure of damage assessment through experiments on model bridges induced with some specified artificial damages. And, a method of damage assessment of bridges based on those behaviors is discussed in detail. Finally, based on the results, a possible application for structural health monitoring systems for existing bridges is also discussed.
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Sensitivity analysis of mechanical behaviors for bridge damage assessment
Miyamoto, Ayaho,Isoda, Satoshi Techno-Press 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.41 No.4
The diagnosis of bridge serviceability is carried out by a combination of in-situ visual inspection, static and dynamic loading tests and analyses. Structural health monitoring (SHM) using information technology and sensors is increasingly being used for providing a better estimate of structural performance characteristics rather than above traditional methods. Because the mechanical behavior of bridges with various kinds of damage can not be made clear, it is very difficult to estimate both the damage mode and degree of damage of existing bridges. In this paper, the sensitivity of both static and dynamic behaviors of bridges are studied as a measure of damage assessment through experiments on model bridges induced with some specified artificial damages. And, a method of damage assessment of bridges based on those behaviors is discussed in detail. Finally, based on the results, a possible application for structural health monitoring systems for existing bridges is also discussed.
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STANDARD SPECIFICATION FOR CONCRETE STRUCTURES, -2001 “MAINTENANCE”
Toyoaki Miyagawa,Hidenori Morikawa,Nobuaki Otsuki,Ayaho Miyamoto,Kazuo Eguchi,Hidenori Hamada,Atsushi Hattori,Tetsuo Harada,Susumu Inoue,Yuichi Kaneko,Yasushi Kamihigashi,Kenji Kawai,Masaru Kawamura,Y 대한토목학회 2003 대한토목학회 학술대회 Vol.2003 No.10
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