Design Study Of Prebeam Simply Supported Bridge Based On Standard Spans

Prebeam gets attention of bridge engineers because of its height advantages.This new structure is suitable for urban interchange and highway overpass.It will have good prospects in China. From the beginning of the eighties of last century, China began to carry out related research on prebeam, got some achievements and actual projects. However, due to the lack of domestic relevant regulations and standards, promotion in this field is currently in a state of stagnation. Current research has been done in MOHURD, began compiling the national standard "Bending prestressed composite girder bridge design and construction rules", to guide the design and construction of prebeam bridge. In the process of promotion of preflex composite beam bridge, the standardized design is also one of the important component. In this paper, the following researches have been done:1) Based on the elastic design method, starting from the different states of prebeam bridges in the process of construction and use, the computing sections of prebeam are classified. According to the different force state, the section principal stress and the formula of span deflection of each stage of upper and lower flange of the steel beam, concrete I and concrete II are deduced.2) Study out the sizes of prebeam simply supported bridge of the same width in 10 standard spans and check the sizes in order to determine a complete set of standardized design.3) Summarize, organize and do regression analysis according to the parameters of the standardized design in the last step, in order to find out the relationship between the parameters, which makes the design of prebeam simply supported bridge no longer confine to a limited, several discrete and expands the scope of the design.Standardized design in this paper highlights the features and advantages of prebeam. The achievements of research are strongly targeted, which has some significance to the design of prebeam bridge and has made a foundation for the promotion of prebeam in our country.