大悬臂宽箱组合梁的应力不均匀性研究

Study on Stress Non-uniformity of Long-cantilever Wide-box Composite Girder

大悬臂宽箱组合梁是一种结构形式新颖的桥梁结构,九堡大桥引桥采用了这种形式钢与混凝土组合梁。该文结合该工程,采用有限元方法建立全桥板壳和实体有限元模型,计算了不同荷载作用下的组合梁受力,得到了主梁各个部分构件的应力。研究了组合梁中顶、底板的应力分布的不均匀性,揭示了大悬臂组合梁桥中钢与混凝土的应力分布特点,为同类结构的日后设计计算提供了参考。

The long-cantilever wide-box composite girder is a new girder structure of bridge. This steel and concrete composite girder is used in the approach of Jiubao Bridge. Combined with this project, the article sets up the plate-shell and solid finite element model for the whole bridge by the finite element method, calculates the mechanical character of composite girder under the different loads, and gives the stresses of various members of the main girder. The article studies the non-uniformity of stress distribution of top deck and bottom plate of composite girder, and reveals the stresses distribution characteristics of steel and concrete composite girder in long-cantilever wide-box composite girder bridge, which can be referenced to calculate and design the similar bridges.