The invention relates to a bridge-crossing type
label-domain-free adaptive damage identification method, which belongs to the technical field of bridge
structure health monitoring and comprises the following steps of: 1, constructing a three-
tower type feature extractor comprising a
time domain tower, a
frequency domain tower and a
modal tower to obtain a cross-
modal combined feature; 2, aligning with a
modal map through modal consistency constraint; 3, utilizing a multi-scale and dynamic
frequency band attention mechanism to adaptively highlight a damage sensitive
frequency band; 4, confrontation and cooperation mixed alignment is adopted, feature distribution differences are reduced, and modal physical consistency is kept; 5, a self-training and multi-teacher
distillation mechanism guided by modal confidence is designed under the non-labeling condition, and the pseudo
label quality and the training stability are improved; and 6, introducing physical constraint regularization to ensure that a result accords with a
structural dynamics rule. According to the method, the damage probability distribution, the modal similarity
heat map and the reliability index are finally output, target domain labeling is not needed, and the accuracy, the robustness and the
engineering applicability of cross-bridge damage identification can be improved.