Measurement method, measurement device, measurement system, and measurement program

A measurement device comprising:

• an accelerometer installed at an installation position of a superstructure of a bridge, the installation position being located below an observation point along a vertical direction;
• a memory configured to store a program;
• and
• a processor configured to execute the program so as to:
• acquire acceleration data output from the accelerometer that observes the observation point of the superstructure of the bridge when a vehicle moves on the superstructure;
• integrating an acceleration of the acceleration data to obtain an integral speed;
• calculating a first speed vibration component by performing high-pass filter processing on the integral speed, the first speed vibration component including a first maximum value and a first minimum value;
• calculating a first speed amplitude corresponding to a difference between the first maximum and minimum values of the first speed vibration component;
• calculating a conversion function using an approximate expression of deflection of the superstructure and environmental information including a dimension of the vehicle, a dimension of the superstructure, and a position of the observation point, which are created in advance;
• estimating a displacement amplitude of the superstructure based on the first speed amplitude and the conversion function when the vehicle moves on the superstructure;
• and
• determine an abnormality of the superstructure based on the estimated displacement amplitude of the superstructure.

A non-transitory computer-readable storage medium storing a measurement program for causing a computer to execute a process by a processor so as to perform the steps of:

• acquiring acceleration data output from an accelerometer that observes an observation point of a superstructure of a bridge when a vehicle moves on the superstructure, the accelerometer being installed at an installation position of the superstructure, the installation position being located below the observation point along a vertical direction;
• integrating an acceleration of the acceleration data to obtain an integral speed;
• calculating a first speed vibration component by performing high-pass filter processing on the integral speed, the first speed vibration component including a first maximum value and a first minimum value;
• calculating a first speed amplitude corresponding to a difference between the first maximum and minimum values of the first speed vibration component;
• calculating a conversion function using an approximate expression of deflection of the superstructure and environmental information including a dimension of the vehicle, a dimension of the superstructure, and a position of the observation point, which are created in advance;
• estimating a displacement amplitude of the superstructure based on the first speed amplitude and the conversion function when the vehicle moves on the superstructure;
• and
• determining an abnormality of the superstructure based on the estimated displacement amplitude of the superstructure.