关键词: 滑行道桥, 损伤量化, 振动频率, 挠度, 安全承载力

Abstract: To eficiently analyze the safe passage capacity of taxiway bridges under damage conditions and investigate theirresponse parameters under different damage scenarios, this paper adopts a numerical simulation method to es-tablish an aircraft-taxiway bridge coupled vibration damage model and conducts experimental analysis for eval-uating the safety load-bearing mechanical performance of taxiway bridges. According to relevant specifications,for different damage types of taxiway bridges (overall damage, bearing damage and local cracks), the overallstiffness damage degree is quantified as 5%, 10%, 15%, 20% and 25%, and the bearing stiffness damage degreeis quantified as 20%, 40%, 60%, 80% and 100%. Based on the position of prestressed tendons, five crackdepths of 20, 40, 60, 80 and 100 mm are set to quantify crack damage. Combining the loading effects of differentaireraft types, this study investigates two response parameters of taxiway bridges (frequency and mid-span de-flection) under various working conditions to verify the feasibility of damage grading, and perform related safetyload -bearing capacity analysis of taxiway bridges. The results show that the variations of frequency and mid-span deflection of taxiway bridges under different damage types (overall damage, bearing damage and localcracks) are all clearly correlated with the damage degree, and different damage types significantly affect thestructural response of taxiway bridges.

Key words: taxiway bridge, damage quantification, vibration frequency, deflection, safety load-bearing capacity