In this study, in order to analyze axle weights accurately, a method using time-frequency analysis was applied to detect axle position information from strain hitrory data with relatively long influence lines. The axle position information includes the number of axles, spacing of axles, and axle position at a moment. This method can improve accuracy of analysis results of axle weights by Weigh-In-Motion and reduce the number of strain sensors in a monitoring system. Furthermore, it can be adopted to analyze vehicle types or velocity. In this study, the method using time-frequecy analysis was demontarated for the case of orthotrapic steel deck system.
