1．Central South University，Changsha，Hunan 410075，China；2．Central South University of Forestry and Technology，Changsha，Hunan 410075，China；3．China Railway Siyuan Survey and Design Croup Co．Ltd，Wuhan，Hubei 430063，China
Abstract：Research purposes: The four improved design programs were proposed for the characteristics of unfavorable transverse stress in preliminary design of Yichang Yangtze River Bridge． By analyses of the influences of design parameters such as the setting position and figuration size of the diaphragm and transverse beam，the mechanisms and efficiencies of each program were revealed comprehensively．Based on the result of parameter analysis，an optimum program Was offered and its mechanism was verified thoroughly．
Research conclusions: ：(1)The elastic support of the diaphragm affects the whole load—bearing capacity of the section of box beam to some extent and the transverse beam can easily and directly improve the load——bearing capacity of the roof，SO with consideration of the advantages of each design program，an integrated program should be made to improve the load—bearing capacity of box beam．(2)It can be seen from the change law of axial force of boom that the axial force of the boom in all calculation programs has no change basically．It shows the diaphragm or transverse beam installation only changes the transverse rigidity of box beam and has a little influence on the vertical rigidity of box beam， and it also verifies again the elastic support effect of the diaphragm only changes the force transfer way in the box beam and has no obvious innuence on the rigid ratio of the beam and arch．
2009, Vol. 26 
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