Abstract：Research purposes: Xinkai River Extra Major Bridge is located in the city proper of Tianjin with total length of 5330. 37 meters. Except a few of long-span prestressed continuous girders are used for some large-scale overpass， the prestressed simply supported beam of 20，24 or 30 meters are adopted to the most bridge spans. The special geographical conditions require the structural style not only to satisfy the mechanics demands but also to be practical and elegant. Therefore，the choice of web slop is one of the important factors to realize the elegancy.
Research methods: Take Xinkai River Extra Major Bridge of Beijing-Tianjin Intercity Rail Transit for example，the stress conditions of cross-section with different web slops of box beam are calculated，compared and analyzed.
Research results: Because the roof in the cross selection of inclined web box beam bears the tension and bending moment the web slope of box beam is larger the tension in roof is stronger. Through the calculation of distributed steel the cross-section structure with web slope of 3:1 was adopted to the simply supported box beam of Xinkai River Extra Major Bridge of Beijing-Tianjin Intercity Rail Transit.
Research Conclusions: For the choice of web slope of prestressed concrete box beam，it is not only necessary for consideration of making the slope coordinate with the entire bridge，but also necessary for full consideration of coordination with the whole local environment ， and the more important point is to find out the rational cross section which not only satisfies the stress requirement ， but also is practical and elegant.
刘敬棉. 预应力混凝土简支箱梁腹板斜率的研究[J]. 铁道工程学报, 2007, 24(4): 34-38.
LIU Jing-mian. Research on the Web Slope of Prestressed Concrete Simply Supported Box Beam. 铁道工程学报, 2007, 24(4): 34-38.
2007, Vol. 24 
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