变截面预应力混凝土箱形连续梁桥设计若干问题的探讨

Study on the design of non-uniform continual box-gird with pre-stressed concrete bridge

采用了一种新型的虚拟层合板壳单元进行空间有限元分析计算。计算结果验证了预应力混凝土箱形连续梁桥中出现斜裂缝的原因推测。经计算发现设计改良后桥梁的工作状态得到了极大的改善,且利用虚拟层合板壳单元法计算,不仅可大大减少单元数量且计算结果精确,计算速度快。

A new style element--virtual lamina shell element was applied to do the FEM spatial analysis of structure. Results prove that presumption of the causes of diagonal cracks in continual box-gird with prestressed concrete bridge is correct. According to the results of analysis of the improved design, the active state of the bridge has been greatly improved. By use of the method of virtual lamina shell element, not only the calculation speed is increased, but also the number of elements reduced.