采用UHPC实现无预应力的简支变连续设计分析  

Analysis on Simple-Supported Girder Bridge has Continuous Deck with UHPC and without Prestressing Method

作　　者：段昕智 李方元[2] DUAN Xinzhi;LI Fangyuan(Shanghai Municipal Planning and Design Institute Co.,Ltd.,Shanghai 200031,China;Dept.of Bridge Engineering,Tongji University,Shanghai,200092,China)

机构地区：[1]上海市市政规划设计研究院有限公司,上海200031 [2]同济大学桥梁工程系,上海200092

出　　处：《结构工程师》2022年第2期137-144,共8页Structural Engineers

基　　金：上海城投(集团)有限公司科技创新计划项目(CTKY-ZDXM-2018-003)。

摘　　要：简支变连续桥梁兼顾简支梁桥和连续梁桥的优点,被国内外大力推广应用。但简支变连续桥梁的预应力方案复杂性降低了其施工快捷性。本文通过杆系和实体模型进行对比研究,对小箱梁简支变连续的应力分布进行了分析,然后通过预应力等效概念设计方法,研究利用UHPC材料的抗拉和延性性能实现无预应力简支变连续的可行性和设计方法,结果证明具有可实施性,最后提出了可实现的技术方案。The simply supported bridge with continuous deck has the advantages of both simply-supported girder bridge and continuous girder bridge,and has been widely applied.But the complexity of the prestressed concrete scheme for simply supported continuous bridge reduces the construction speed.With the truss model and the solid model,this paper compared and analyzed the small box girder with the construction stage from simply supported to continuous to get the stress distribution.By the method of prestressing equivalent concept to design the structure with UHPC tensile properties,the feasibility and design method were analyzed using UHPC as the substitutes of prestressing,the operation of the scheme are put forward to application.

关 键 词：超高性能混凝土(UHPC) 小箱梁 预应力 简支变连续梁桥 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]