抄録
Deflection of a bridge is an important physical quantity, which is usually specified in bridge design. The deflection can also be utilized in the estimation of traffic load. However, the measurement of deflection is oftentimes not practical. Reference points for displacement sensor are usually not available. While deflection estimation by simple double-integration of acceleration measurement is considered to provide a simple and inexpensive deflection estimation, this approach suffers from integration errors when the integration duration is long. In this study, deflection estimation utilizing inclination is proposed. The vertical accelerations and inclinations converted from the longitudinal accelerations are fused through a Kalman filter to evaluate the bridge deflection. As opposed to acceleration-based deflection estimation in the past, the proposed method is in principle applicable to road bridges where multiple vehicles pass in series.
