Analysis of Spatial Mechanical Properties of High-Speed Railway Concrete Box Girders

Based on the conventional analytic theories for shear lag,distorsion and restrained torsion of the thin-wall box girders,an analytic calculation mode of the general concrete box girders for high-speed railway is established.By means of the finite element numerical method,the laws of stress distribution in the cross sections of the box girders and other related critical influential factors are analyzed,and the conception of enlargement coefficients for the distorsion and restrained torsion of the box girders for double-track high-speed railway is put forward in accordance with the general design of the girders.