一种带肋的曲线板单元

A Curved Plate Element with Rib-beam

将桥面板与梁肋整体视为一个单元 ,采用位移和转角各自独立插值的Mindlin板单元和 8节点Serendipity单元的位移模式 ,构造了一种用于考虑几何非线性的带肋曲线板单元 .在此模型中 ,考虑了梁肋的作用 ,但梁肋不必放在板单元的节点连线上 ,克服了以往带肋曲板板肋各自独立划分单元时其结点连接位移不协调的问题 .算例表明 ,本文方法计算结果可靠、自由度较少 ,适用于大跨度曲线梁桥的非线性空间结构计算分析 .

By treating the deck and the rib-beam as a whole, and by using the displacement modes of the Mindlin plate element and the 8-node Serendipity element in the calculation, a curved plate element with rib-beam was constructed in view of the nonlinearity of the structure. In the Mindlin plate element, the displacement and the angular displacement are interpolated independently. In the proposed element model, the effect of rib-beam is taken into account, and the slab and rib-beam are combined into one element. Therefore, the displacement incoordination of the joint in the nodes of the plate element and the rid-beam element no longer exists. Numerical examples show that the proposed method is of the advantages of reliable calculation results and less freedom degree, and it is applicable to the nonlinear spatial computation of the large-span curved girder bridge.