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为了准确分析混凝土桥梁悬臂牛腿结构的空间受力状态,寻求模型规模、加载方式、应力水平及其对分析结构的影响,文章以带预应力混凝土简支T梁挂孔的4跨T型刚构桥梁实体工程为背景,分别建立了不同悬臂梁段长度的5个局部有限元模型,对比分析了不同模型尺寸时,中载和偏载工况下结构的应力及变形,研究分析了运营荷载及不同超载情况下结构的应力及变形状况。结果表明,局部模型的应力应变可用于实际设计,偏载状况更不利,结构变形应采用整体模型进行计算;发生在腹板位置凹角处的主拉应力较大,结构分析及配筋时应注意腹板附近混凝土应力状态的把握。
In order to accurately analyze the space stress state of cantilever corbel structure of concrete bridge and seek the influence of model scale, loading method, stress level and its influence on the analysis structure, Based on the physical engineering of bridge, five local finite element models with different lengths of cantilever are established respectively. The stress and deformation of the structure under medium and partial load conditions are compared and analyzed under different model sizes. And the structure of the stress and deformation under different overload conditions. The results show that the stress and strain of the local model can be used in the actual design and the partial load condition is more unfavorable. The structural deformation should be calculated by using the overall model. The main tensile stress occurring in the concave corner of the web position is larger. Control of concrete stress state near the web.