Abstract:In order to optimize the mechanical performance of the taxiway bridge, a further study on the coupled vibration response law of the aircraft and taxiway bridge was carried out. By establishing the theoretical equations of the taxiway bridge's simple beam and continuous beam, with the aid of the finite element software Ansys, the effects of the simple beam bridge's section form, span, continuous beam bridge span and side-span ratio on the aircraft-bridge coupling vibration were compared and analyzed. The research results show that when the cross-section height and span of the simply supported beam bridge keep the same, the maximum deflection in the middle of the box girder bridge is significantly smaller than that of the T-beam bridge, and the fundamental frequency is higher than that of the T-beam bridge. The fundamental frequency and span of the taxiway bridge will affect the vibration response of the structure. As the span increases, the maximum deflection of the bridge first decreases and then increases. When the span of the taxiway bridge is small, the mid-span displacement response is larger since its fundamental frequency is close to the vibration frequency of the aircraft. As the span increases, the fundamental frequency of the taxiway bridge gradually moves away from the aircraft frequency, and the maximum deflection in the mid-span gradually decreases. When the span reaches a certain value, the maximum deflection in the mid-span increases again. Considering the effects of fundamental frequency and span, for the A320 aircraft, the taxiway bridge with a span of 17 to 20 m has the smallest vibration response. For continuous beam bridges, as the number of spans increases, the maximum deflection of the taxiway bridge gradually decreases and tends to be stable. For continuous beam taxiway bridges with a span of about 20 m, four or five spans are good bridge forms. And the optimal side-span ratios are 0.95 and 0.94, respectively. The above conclusions provide significant reference for the optimization design and diagnosis technology of taxiway bridge structure.