The cumulative damage of the steel structure occurred by overload, fatigue and other reasons in service may deteriorate the safety of the structure seriously.
钢结构在服役过程中，因超载、疲劳等原因会引起损伤累积，极大地影响了结构的安全使用。
2
In order to ensure structural safety in the design working life, it is necessary to carry out integrity analysis of fatigue and to evaluate the degree of fatigue damage on the structure.
In engineering the structuredamage identification technology is of great significance to grasp structure working condition and to assess its safety and normal service performance.