摘要
廊坊光明道首次以主跨268m连续钢桁梁上跨京沪高铁,采用上加劲弦体系钢桁梁有效减小建筑结构高度,更有利于长悬臂转体施工;通过轴销铰接解决了短腹杆的受力问题;采用超高性能混凝土(UHPC)与正交异性钢桥面组合铺装体系有效解决钢桥面疲劳开裂和铺装层损坏难题;采用无应力状态法控制结构线形,降低了拼装难度,确保成桥线形与设计吻合;采用带辅助滑道简支体系转体方案,结构受力明确,线形调整方便,更有利于长悬臂非对称转体受力和倾覆稳定,最大程度减小对京沪高铁的影响。计算结果表明,本桥的强度与刚度均满足结构安全要求。
It is the first time for Langfang Guangming Bridge utilizing continuous steel truss bridge with the main span of 268 m to cross Beijing-Shanghai High-speed Railway.The steel truss with upper stiffening system can effectively reduce the height of the building structure,which is more beneficial to the rotation construction method of the long cantilever girder.Axle pins are pin-connected to optimize inner-force status of short web members.Ultra-high Performance Concrete(UHPC)and orthotropic steel deck solve the issue of deck fatigue cracking and pavement layer deterioration.By using stress-free state method,it ensures structural linear accuracy,reduces assembling difficulties and ensures the linearity of the completed bridge is consistent with the design.Assistant pier with slideway creates a simply-supported system for rotation construction method with a definite inner force status and convenient linear control,it also increases the stability of asymmetrical cantilever rotation construction while reducing the potential influences to Beijing-Shanghai High-speed Railway.Analysis indicates this design provides adequate strength and stiffness for the bridge.
作者
朱勇战
ZHU Yongzhan(China Railway Fifth Survey and Design Institute Group Co.Ltd.,Beijing 102600,China)
出处
《铁道建筑技术》
2020年第8期55-59,80,共6页
Railway Construction Technology
基金
中铁第五勘察设计院集团有限公司科技研发项目(T5Y2019-B03)。
关键词
上跨高铁
连续钢桁梁桥
上加劲弦钢桁梁
转体施工
无应力状态控制
over crossing high-speed railway
continuous steel truss girder bridge
steel truss girder with upper stiffening system
rotation construction
unstressed state control method
