摘要
为了解决三跨连续钢箱梁顶推通过某交通主干道,既要保证桥梁整体抗倾覆稳定,又要求导梁在最不利工况下腹板、翼缘板不发生局部屈曲的矛盾,采用壳单元模拟工字形导梁,利用圣维南原理建立首节导梁有限元模型,基于导梁局部屈曲安全系数大于整体抗倾覆安全系数的原则,对导梁的截面形式和加劲肋布置进行了优化选型.通过对顶推过程全程跟踪监测,理论分析与现场实测结果吻合良好,为该桥的顶推施工提供了强有力的技术保障,研究方法与所得结论对同类工程设计施工具有参考价值.
In order to ensure stability of whole bridge for anti-overturning and circumvent that buckling does not occur in most unfavorable conditions, when continuous steel box girden pushs through a main road, shell ele- ments are adopted to simulate the I-shaped launching nose. Saint Venant principle was used to establish the finite element model of first section launching nose, based on principle that the safety factor is greater than the whole resistive overturning safety factor： The launching nose cross section form and stiffener layout were selected. Through monitoring the process of incremental launching, the theoretical analysis is in good accordance with the measured results, which provides strong technical support for the incremental launching construction. The re- search method and the conclusion are valuable for the reference of similar engineering.
出处
《兰州工业学院学报》
2015年第6期62-67,共6页
Journal of Lanzhou Institute of Technology
关键词
顶推
导梁
屈曲
优化设计
incremental launching
launching nose
buckling
optimum design
