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Bridge influence lines play an important role in damage identification and condition assessment research. The existing research on influence lines mostly focus on highway bridges. In contrast, rail vehicles have a large number of axles and fast running speeds, which increases the difficulty of influence lines acquisition and extraction. At first a high-accuracy extraction method for the influence lines of track bridges based on regularization is firstly established; following that, the bridge response data is obtained by the finite element model and the validity of the extraction method of the influence lines is verified. On this basis, the influence of equipment parameters such as (sampling frequency, sampling accuracy) on the results is studied. The results show that the influence line calculation method based on regularization can be well applied to the identification and extraction of influence lines of track bridges. In order to ensure the extraction accuracy of the influence lines, the sampling frequency of strain and deflection is not lower than 25Hz, and the deflection and strain sampling accuracy is higher than 0.05mm and 1με , respectively.
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