Study On Structural State Evaluation Of Aircraft Taxiway Bridge

With the rapid development of airport construction in China,the renovation and expansion of large airports and new projects of small and medium-sized airports are in full swing.As an important part of the airport transportation system,taxiways are naturally essential for planning and construction.When taxiways need to cross the airport approach road,underpass passages or river channels,taxiway bridges need to be built to solve the communication problem.There are about 70 taxiway bridges in China.Compared with highway,railway and urban bridges,these taxiway bridges are characterized by large bridge width-span ratios,fewer members,large and concentrated loads,and spatially affected bridges.The service life of these taxiway bridges is more than 10 years,and there are more or less problems.Most of the existing bridge inspection and evaluation norms in China are used to evaluate the multi-span and multimember structures of highway bridges.For most taxiway bridges with single span or two span structures,it is difficult to evaluate these bridges with fewer members objectively and accurately in the existing norms.Therefore,the technical condition evaluation method of taxiway bridges is studied in this thesis.This thesis specifically aims at the establishment of the technical condition evaluation system of taxiway bridges,the weight of each component of the evaluation system,the evaluation method of bridge members and components,and the division of the final bridge evaluation boundary,etc.,using expert questionnaire surveys,literature investigations and example verification methods.First of all,the size characteristics,structural forms,design standards,common diseases of taxiway bridges at home and abroad,as well as the relevant design and inspection specifications of airport,highway and urban bridges are investigated.The bridge types,member characteristics and member evaluation indexes of taxiway bridges,common highway and urban bridges are compared and analyzed.Secondly,the weights of taxiway bridge members and components are formulated through expert questionnaire.On the basis of literature investigation and case comparison,the calculation flow of taxiway bridge technical condition evaluation and the applicability of taxiway bridge evaluation method are studied.Finally,a taxiway bridge technical condition evaluation system covering four levels of members,components,parts and the whole bridge is put forward.