连续刚构桥单肢空心薄壁墩实心段计算长度分析-《郑州大学学报(工学版)》

文章信息/Info

Title:: Solid Sections’ Calculation Length Analysis of Continuous Rigid Frame Bridge Hollow Single Thin-walled Pier

Author(s):: Li Yilin; Huang Xuqin; Wu Xiaoguang; Shaanxi Provincial Key Laboratory of Bridges and Tunnels, Chang’an University

Keywords:: continuous rigid frame bridge; Hollow thin-walled pier; stiffness transition; thrust stiffness; calculate length

摘要:: 连续刚构桥的高墩大部分是采用空心薄壁墩形式，墩底宜有适当的实心段以便承台和薄壁墩刚度过渡，目前尚未有文献对实心段的设计长度选取进行研究，设计时都是依据工程经验来选取，具有很大的局限性。本文首次通过推导单肢薄壁墩空心段和实心段的顺桥向抗推刚度来对实心段过渡长度进行分析，分析时将空心段和实心段连接处用平动约束、转动约束和平转动耦合约束弹簧来模拟相互之间约束作用，最后以工程实例验证了文章分析思路和推导过程的正确性和适用性。本文研究结论建议将墩底实心段计算长度的取值范围3-6m写入规范中来指导高墩的设计和施工。

Abstract:: Continuous rigid frame bridges with high piers mostly use hollow thin-walled pier, and the bottom of the piers should have appropriate solid sections in order to ensure the stiffness transition of the cap and thin-wall pier. At present, there is no literature to research the design length of solid section, and the design is based on engineering experiences to select, which has great limitations. In this paper, the transfer length of the solid section is first time analyzed by calculating the anti-push rigidity of bridge in axial direction of the single thin-wall pier in the hollow section and the solid section, and the constraint effect at the connection point between the hollow section and the solid section is simulated by exerting the translational constraint, the rotational constraint and the flat rotation coupling constraint springs. Finally, engineering examples are given to verify the correctness and applicability of the analysis thought and derivation process. In this paper, the research conclusions suggest that the solid section at the bottom of the piers’ calculation length range can take 3-6m, and can be written into the specification to guide the design and construction of the high piers.