PC斜拉桥结构精细有限元模型分析

Analysis on Refined FEM of a Long Span PC Cable-staged Bridge

以武汉长江二桥为研究对象,讨论了大型双塔双索面预应力混凝土斜拉桥结构精细有限元模型的建立方法,充分考虑了预应力混凝土斜拉桥结构的特点,提出了预应力斜拉索、预应力钢筋、普通钢筋、主梁和主塔等几种主要构件的单元划分原则以及边界条件模拟的方法,建立了武汉长江二桥空间精细有限元模型,通过不同荷载组合分析了空间精细有限元模型的应力应变和挠度等,计算结果与试验结果比较接近,说明了这种方法的有效性。

The refined finite element model was established for Wuhan Second Bridge which is a long span PC cable-staged bridge with double pylon and cable plane. The properties of the bridge were widely considered and mesh principle was presented for the main parties such as pre-stressed cable, pre-stressed rebar, common rebar, the beam and tower. On the meantime, boundary conditions of the bridge were analyzed. By a lot of dead load combination, the stress, strain and deformation were calculated. It shows that experiment result coincides with theoretical analysis well.