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A method for damage identification of beam based on time domain response sensitivity is proposed. The damage of the beam is regarded as the reduction of Young’s modulus, and the damage of the beam structure is detected by comparing the difference in displacement response between the undamaged-beam and damaged-beam. At the same time, the derivation and establishment of sensitivity matrix and the solution of sensitivity equation were introduced in detail, and the accuracy of the method was verified by software such as ABAQUS and MATLAB. Numerical analysis shows that the sensitivity analysis method has the advantages of simple operation, less measuring points and high precision. Quantitative measurements can be achieved for single damage conditions. Meanwhile, positioning measurements can be achieved for multiple loss conditions.

Research on Beam Structure Damage Identification Method Based on Time Domain Response Sensitivity Analysis