Under cyclic alternating load, steel structures are prone to fatigue cumulative damage, especially under the action of natural disasters will aggravate the fatigue damage, resulting in cracking failure and fracture collapse. The non-destructive evaluation technology of hysteresis is based on the hysteresis behavior of materials is very sensitive to the changes of microstructure and stress conditions of materials. By measuring the hysteresis parameters of steel structures under fatigue state, the safety state and residual life of steel structures can be effectively evaluated and graded.

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