摘要
针对贵州北盘江大桥三角区特殊的构造,提出了下弦采用挂篮施工并辅以扣索张拉,上弦采用支撑于下弦顶面的施工支架现浇施工方法。建立了三角区箱梁、扣索和施工支架于一体的有限元模型,开展了3种不同工况下的施工支架力学分析。计算结果表明:施工支架立柱内力受下弦梁段浇筑、扣索张拉和预应力张拉等影响较大,会出现内力集中现象。
Based on the special construction details at spandrel zone of Beipanjiang Bridge,the construction with cantilevered segmental method in the lower chords and on-site construction of bracket in the upper chords were conducted.A finite element model including box girders,cables and brackets was built;the mechanics analysis of the bracket in three different cases was performed.The results demonstrated that lower chords girder concrete casting,cables and pre-stress bars tensioning exerted great influence on internal forces of bracket columns;internal forces concentration would occur.
出处
《重庆交通大学学报（自然科学版）》
CAS
北大核心
2011年第3期361-365,共5页
Journal of Chongqing Jiaotong University(Natural Science)
关键词
空腹式刚构桥
施工支架
受力分析
内力集中
spandrel rigid frame bridge
construction bracket
mechanics analysis
internal force concentration
