Research Article

Damage Identification of a Derrick Steel Structure Based on the HHT Marginal Spectrum Amplitude Curvature Difference

Table 2

Damage experimental conditions of the derrick steel structure.

ConditionDamage formDamage typeDamage position

1Pin looseSingle damageThe place between second segment and third segment
2Single damageThe place between third segment and forth segment
3Double damageIntegrating the first two kinds of damage location