| At present,the design and construction technology of cable stayed bridge in our country have been among the international advanced ranks.The beautiful and special cable-stayed bridges are becoming the special projects of city construction,because the cable-stayed bridge is not only rich in shape,strong spanning capacity,flexible span layout and construction disturbance,but also has good economy,safety and mechanical properties.With the continuous progress of the urbanization process,the cable-stayed bridge as a new type of urban landmark buildings in the future attactes more and more people’s favor and attention.As an important hub of the city road and the throat of the road traffic,once a larger accident happens in the bridge,it will seriously affect the local production and living and transportation.So it is very important to sum up the methods of bridge detection test and the theory of technical analysis.The overall characteristics,structure and change rule of the cable-stayed bridge after the performance are more complex,so it must be detected and analysed in order to get further imformation of the actual work,carrying capacity and safe use conditions.The static and dynamic test is the most direct and effective method to evaluate the technical condition and performance of the bridge,and it is also an important basis for the safety inspection and monitoring of the bridge.So the research on the static dynamic test of typical structure of cable-stayed bridge,with a strong theoretical guidance,can promote this type of cable-stayed bridge detection theory of continuous improvement and rich,and is also the guarantee and basis of effective parameters of cable-stayed bridge design,construction,maintenance,reinforcement and maintenance of the whole process of quality and safety.Because of the influence of the location of the city space,the budget of the construction cost,the requirement of the shape and the function,the design of the Orange Island Bridge in the background of the project is the special shaped structure cable stayed bridge.The bridge is a single tower and single cable plane cable-stayed bridge,bridge approach of partially prestressed concrete box girder connected on both sides of the complicated structure.The main research points of this paper:the first point is the determination of the load condition of complex structure.In order to determine the most unfavorable loading conditions,carries on the analysis using Midas Civil finite element software,access control section and through the internal force envelope diagram,according to the influence line control section,in full consideration of results and the efficiency of the test,to further determine the condition with body position,the second point is the dynamic performance of the cable-stayed bridge is more complex.The dynamic characteristics of the bridge are studied by the time history curve of the bridge natural excitation.By using the finite element model,the calculation of free vibration characteristics of bridge and the lead,and the first 8 modes of the main bridge and approach the 15 modes of results were analyzed and compared.the third one is in the load test of cable tension deviation rate analysis is complex.the fourth one is the complex dynamic characteristics of results of theoretical analysis summarized the cable-stayed the bridge,and put forward the corresponding countermeasures and suggestions for the construction,design and test,embodies the essence and purpose of bridge detection,while the accumulation of a series of complex structure of the cable-stayed bridge test method,in the future the same type of cable-stayed bridge will have a broad role of reference and guidance. |
