Research on the Influence of Cracks at End of Railway Simple Supported Box Girder on Mechanical Performance
LI Xuebin1, MA Lin1, WU Guoqi1, YANG Xinyi1, DONG Liang1, CHEN Qiang2, ZHANG Shan3, ZHANG Bo4
1. China Academy of Railway Sciences Corporation Limited,Beijing 100081, China; 2. Haoji Railway Co. Ltd, Beijing 100073, China; 3. China Railway No. 3 Engineering Group Co. Ltd, Taiyuan, Shanxi 030001, China; 4. China Railway 22nd Bureau Group Co. Ltd, Beijing 100043, China
Abstract：Research purposes: During the lifting process of precast box girder, due to the unbalanced force of each lifting point, longitudinal cracks are prone to occur near the lifting hole at beam ends. In order to test static performance of the structure after cracked damage of beam ends, the bending rigidity, crack resistance and torsional rigidity of 32 m simple supported box girder were analyzed through bending and torsional static load tests. Research conclusions: (1) During the lifting process, the box girder was subjected to large impact, resulting in multiple longitudinal cracks at the beam end, but did not cause cracks in the mid - span section of the beam. (2) The actual bending and torsional rigidity of the damaged box girder at the beam end are greater than the design rigidity, and the crack resistance meets requirements in codes. (3) The main reason for the large bending rigidity of beam is that the actual elastic modulus of structure is larger than the design calculation value. (4) The single track load does not control the stress design of the double track box girder section. (5) The cracks near the lifting points do not affect the mechanical performance of the beam. (6) The cracks should be closed to ensure the durability and safety of the structure. (7) The research results can provide guidance for the construction and quality control of railway precast simple supported box girder.
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LI Xuebin, MA Lin, WU Guoqi, YANG Xinyi, DONG Liang, CHEN Qiang, ZHANG Shan, ZHANG Bo. Research on the Influence of Cracks at End of Railway Simple Supported Box Girder on Mechanical Performance. Journal of Railway Engineering Society, 2022, 39(11): 43-49.
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2022, Vol. 39 
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