Research On Ultimate Bearing Capacity Of The Aircraft Taxiway Bridge Via Model Updating

Applying the traditional method to evaluate the ultimate bearing capacity of the bridges usually needs to suspend the traffic and takes longer.The result is that the traffic jams become very heavy,which affects people's travel.Especially the taxiway bridge in airport,the control of launching and landing time of the aircraft is very strict so applying the traditional method to evaluate the ultimate bearing capacity of the bridge will cause flight delay,which causes very serious influence.Therefore,it is necessary to explore a quick,accurate and not interrupted operation of flight method to evaluate the ultimate bearing capacity of the taxiway bridge.According to the specific circumstances of Taxiway Bridge in airport,this thesis has a research on the ultimate bearing capacity of the taxiway bridge,which is based on the design principle,the theory of finite element model updating,the theory of nonlinear finite element analysis and the field test of Taxiway Bridge and takes the Bridge G and Bridge H located in taxiway of the Guangzhou Baiyun airport as an example.The specific works are as follows:1.This thesis expatiates the research background of ultimate bearing capacity of Taxiway Bridge,the main research methods and developing process at home and abroad,and the theoretical basis of the research methods of the ultimate bearing capacity of the taxiway bridge.2.Making a loading test on G and H Taxiway Bridge.In this procedure we can choose the aircraft in operation as the load tool and use the BDI bridge test system,which can obtain Taxiway Bridge's strain directly under moving load to obtain the strain line of the measuring point on Aircraft Taxiway Bridge.The whole of testing process doesn't need to interrupt the operation of aircraft.3.This thesis amplifies the process of finite element model's establishment and updating of G and H Taxiway Bridge and utilizes the optimum design module in finite element software of ANSYS to revise the finite element model of the Taxiway Bridge,with the result that the finite element model is consistent with the state of the tested taxiway bridge.Besides,the ultimate bearing capacity of the Taxiway Bridge according to the updating model can be calculated.4.This thesis analyses the process of ultimate bearing capacity of G and H Taxiway Bridge in detail and gets a curve of load-displacement.Besides,the cracking load,yield load and ultimate load of the Taxiway Bridge can be calculated.This kind of approach not only can get the ultimate bearing capacity of Taxiway Bridge but also can get the corresponding load when the crack in the main girder begins to appear and when the press-stress steel yields.It can provide a theoretical support to the new introduction of the heavy weight aircraft's passing through the Taxiway Bridge safely and can also provide a theoretical basis on the design,maintenance and reinforcement of the Taxiway Bridge.