空腹式刚架连拱桥钢筋砼拱圈抗裂性研究

摘要

空腹式刚架连拱桥以其诸多优点得到广泛建造；但是其属于高次超静定结构,混凝土收缩、结构降温和预应力张拉等均会对其拱圈使用阶段的抗裂性产生很大影响.以实际工程为背景,运用有限元方法,对各种因素单独影响下拱圈的抗裂性能进行分析,探讨该桥顶推合龙对抗裂性的有利作用.%Open-spandrel frame multiple-arch bridges are widely constructed for many advantages, but because they belong to statically indeterminate structure with higher degrees,their arch crack resisting properties in using are affected greatly by the concrete shrinkage, the structure drop in temperature and the pre-stressed tension and so on. Regarding practical engineering as background and using the finite element method,this paper takes analysis of the arch crack resisting property under the effection of various factors separately, and discusses the beneficial effect of pushing closure on crack resisting property.