Research Of The Mechanical Behavior And Primary Development Of The CAD Software On Railway Preflex Composite Beam

Preflex composite structure is a new type of structure developed following the step of steel structure and reinforced concrete structure. Compared with steel structure, preflex composite structure has the advantages of not only saving steel but also being able to strengthen rigidity of structure members and the whole structure. In addition it has better characteristics in fireproof and antirust. Compared with reinforced concrete structure, it has a lighter structure weight, higher strength, higher bearing capacity and better ductility as well. Furthermore it makes an adequate application of tension and compression characteristics of the two different materials: steel and concrete.Presently, preflex composite beam has been applied in civil buildings, highway bridges and other fields of construction. In order to accelerate the development of preflex composite beam in railway bridges and to design and construct preflex composite beam bridges of railway in our country reasonably, this thesis is from the scientific project of railway department "experiment and application research of railway preflex composite beam" and summarizes the design information and practical projects on preflex composite beam. On the basis of above works, this thesis improves computation method in analysis of railway preflex composite beam on sectional stress, deflection of mid-span, crack width and shearing resistance and programs a software "Preflex Composite Beam Bridge Structure Analysis System - PFSAS", which is adapt to railway bridges in our country. Moreover it makes a primary research in construction techniques and structure measures.