新型空腹刚构桥空腹区合理夹角的数值模拟

摘要

新型空腹刚构桥是近年来由中交第二公路勘察设计研究院提出并申请专利的一种新桥型。空腹区下弦杆与桥墩间夹角α的取值,对墩、梁固结处的应力影响显著,对空腹区的受力性能影响较大。本文运用有限元软件 ANSYS,对贵州北盘江特大桥空腹区的合理夹角选取进行数值模拟,并对空腹区主要构件的受力及合拢点挠度进行对比分析。研究结果表明,该桥型下弦杆与桥墩间夹角α取53°~60°时,空腹区的综合力学性能指标相对较好,合拢点挠度亦最小。%A type of new open-web continuous rigid frame bridge,has been proposed and applied for patent by CCCC Second Highway Consultants Co.Ltd in recent years.For open-web region,the an-gleαbetween its lower chord and pier has a significant impact on the stress of zoon and mechanical property of open-web region.In this paper,different angles of open-web region for bridge closure process are simulated based on Guizhou Beipanjiang Bridge,using ANSYS software,and the force and deformation of the major components of open-web region are contrasted and analyzed.The results show that mechanical performance of hollow region is relatively good and deflection of closure point is relative minimum when the angle αis among 53°to 60°for this type of bridge.