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Analysis of Structural Performance of(90+180+90)m Continuous Beam and Arch Combined Bridge of Beijing-Shanghai High-speed Railway

Journal of Railway Engineering Society(2011)

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Abstract
Research purposes: The Structure performance of continuous beam and arch combined bridge of Beijing-Shanghai High-speed Railway was discussed.For the longest-span(90+180+90) m continuous beam and arch combined bridge of Beijing-Shanghai High-speed Railway,the space member system element finite model was established to detailedly calculate,analyze and research the internal force and creep deformation during bridging,live load effect,long-term creep deflection,load bearing capacity and dynamic characteristics for the purpose of knowing the load bearing characteristics of the combined structure by comparison with single continuous beam without considering the arch.Research conclusions:The continuous beam and arch combined structure of constructing the beam first and then constructing the arch had the features that the structure could bear load integrally,and the arch could passively bear beam's self weight,improve the live load effect,creep effect and the ultimate bearing capacity and enhance the safety degree and long-term operation performance of the structure.The thrust on the arch springing could increase the axial force and deformation.Meanwhile,the out-plane vibration of the arch occurred many times in the first several vibration due to its weak out-plane stiffness.
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Key words
arch combined bridge,continuous beam,beijing-shanghai,high-speed
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