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.
2007, Vol. 24 
