Fig. 1. Method framework

Fig. 2. Data interaction method framework

Fig. 3. Flow diagram of spectral solution method

Fig. 4. FBG-H beam model. (a) Overall model diagram; (b) FBG local diagram

Fig. 5. H-beam dimensions

Fig. 6. Variation of FBG1 central wavelength deviation with temperature

Fig. 7. Variation of FBG1 total central wavelength deviation with load

Fig. 8. Schematic diagram of experimental platform

Fig. 9. Experimental platform construction diagram

Fig. 10. Comparison of the central wavelength offsets obtained by the measured and simulated methods

Fig. 11. Variation of reflectance spectra with uniform increase of load

Fig. 12. Impact loading position

Fig. 13. Comparison of FBG center wavelength deviation obtained by measured and simulated methods after load F₂