Diagnosis apparatus, diagnosis method, and computer readable recording medium

A diagnosis method comprising:

• acquiring vibration information indicating vibration produced in a structure from a plurality of sensors provided to the structure, and generating a natural vibration mode shape using the vibration information;
• calculating a rate of occurrence of a normal natural vibration mode shape based on the number of times vibration was applied to the structure and the number of times a normal natural vibration mode shape was generated when the vibration was applied;
• and
• diagnosing whether or not repair and reinforcement performed on the structure were effective based on the rate of occurrence and a reference value.

A non-transitory computer readable recording medium that includes a program recorded thereon, the program causing a computer to carry out:

• acquiring vibration information indicating vibration produced in a structure from a plurality of sensors provided to the structure, and generating a natural vibration mode shape using the vibration information;
• calculating a rate of occurrence of a normal natural vibration mode shape based on the number of times vibration was applied to the structure and the number of times a normal natural vibration mode shape was generated when the vibration was applied;
• and
• diagnosing whether or not repair and reinforcement performed on the structure were effective based on the rate of occurrence and a reference value.