Case study of a simply-supported channel-box girder under special live load

摘要

This paper is about a design and analysis of 64m simply-supported channel-box girder which is arnpart of expansion project used for hot iron transportation for Lianyuan Steel Plant. Its span, createdrnthe world's largest span record of such bridges. Moreover, the special live load is nearly three timesrnthe weight as the UIC. Hence, an innovative combined cross-section is adopted to reduce thernstructure’s height and meet the clearance requirements under the bridge. Then, the piecewise-castrnconstruction method has been used, so the calculation must take the actual construction process intornaccount. Besides, due to the air and bridge’s thermal performance parameters are not easy torndetermine, it is difficult to calculate the temperature field generated by the mobile thermal radiationrneffects.rnHence, based on the above-mentioned characteristics of the bridge, a detailed calculation andrncomparative analysis are carried out to determine a reasonable cross-section form and dimensionsrnoptimize the tension phase and study the bridge’s force status under different temperature modes.rnThe analysis showed that the design of this bridge meets the requirements of relevant codes and hasrnadequate safety factors, the calculation methods and conclusions proposed by this paper can be arnreference for similar bridge designs in the future.