Development of a monitoring system to evaluate vehicle loads and slab deterioration using bridge vibration power generation

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K04574
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 22020:Structure engineering and earthquake engineering-related
• Research Institution: Kanazawa University
• Principal Investigator: Fukada Saiji 金沢大学, 地球社会基盤学系, 教授 (10313686)
• Co-Investigator(Kenkyū-buntansha): 上野 敏幸 金沢大学, 電子情報通信学系, 教授 (30338256) ; 北川 章夫 金沢大学, 電子情報通信学系, 教授 (10214785)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 振動発電 / モニタリング / 橋梁振動 / 床版変位

Outline of Final Research Achievements

This study focused on the lateral bracing where magnetostrictive vibration power generation devices efficiently generate vibration power. A large output voltage was recorded when the vibration power generation device was installed in the lateral bracing. It was clarified that this vibration power generation device can be used for bridges to provide power for monitoring devices. The deterioration of the slab was estimated by comparing the slab deflections obtained by loading the test vehicle and the ordinary vehicle with the results of an analysis using a finite element model that modeled various types of deterioration. The analytical model was then used to perform an elasto-plastic analysis. The residual bearing capacity of the slab was evaluated from the relationship between the vehicle load and slab displacement.

Free Research Field

橋梁振動

Academic Significance and Societal Importance of the Research Achievements

北陸地方の国県市道や高速道路における道路橋床版では，過積載車両の影響が懸念されることに加え，ASRや塩害および凍害などの要因による劣化が顕著に見られ，これらの床版の劣化度を適切に評価できる手法を開発することが求められている．また，近年，環境振動発電技術への注目が高まっており，これらの電力を利用してIoT向けのモニタリング機器の電源としてのニーズが求められている．
本研究成果として，実橋梁における振動発電による発電効果を確かめられたことおよび実橋における床版の残存耐力を試験と解析から評価できたことは，学術的および社会的なニーズに貢献でき，意義があると考える．