live load and impact load estimation using wireless acceleration and angular velocity measurement and data assimilation techniques

2019 Fiscal Year Final Research Report

• Project/Area Number: 17H03295
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Structural engineering/Earthquake engineering/Maintenance management engineering
• Research Institution: The University of Tokyo
• Principal Investigator: Nagayama Tomonori 東京大学, 大学院工学系研究科(工学部), 准教授 (80451798)
• Co-Investigator(Kenkyū-buntansha): 宮下 剛 長岡技術科学大学, 工学研究科, 准教授 (20432099)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: BWIM / 活荷重評価 / 道路橋 / 疲労損傷 / 無線センサ / 車両動揺

Outline of Final Research Achievements

An algorithm to estimate bridge deflection due to traffic load by using wireless accelerometers was developed. The algorithm is then experimentally validated on a bridge. The algorithm utilizes inclination estimation and eliminates the necessity of numerical integration. The problem of numerical instability existing in conventional deflection estimation based on acceleration measurement is thus addressed.
Then an algorithm to estimate the weight of vehicle driving on a bridge using the estimated deflection is developed. Even when multiple vehicles are running on a bridge, the weight of each vehicle can be decomposed and evaluated.
Finally, vehicle responses measured by the sensors installed on a vehicles are inversely analyzed and the load transmitted through the tire to the bridge is evaluated.

Free Research Field

構造工学

Academic Significance and Societal Importance of the Research Achievements

道路橋の疲労劣化においては構造物側の状態に加えて，作用荷重が支配的となる．5年に1度の定期点検において道路橋の状態評価がなされている一方で，過積載車両を含む活荷重実態は，それを効率的に把握する手法が限定的である．そこで，設置が容易な無線加速度計を利用して簡易に走行車両の重量を推定するアルゴリズムを開発するとともに，車両からタイヤを介して橋梁に作用する衝撃的荷重を評価する仕組みを提案した．