斜拉桥悬臂式索梁锚固区受力分析

Stress analysis at the cantilevered cable-girder anchorage zone for cable-stay bridges

索梁锚固构造是混凝土梁斜拉桥受力分析的关键部位。当双索面斜拉桥截面悬臂较长时,需要设置悬臂式索梁锚固结构。目前索梁锚固结构主要采用把斜拉索锚固在腹板上的形式,较少采用悬臂式锚固形式。因此,在本文借助有限元的分析方法,分析了悬臂式索梁锚固结构的应力分布规律,同时提出了通过适当布置预应力钢筋来改善结构受拉状态的方法,以及降低应力集中影响的措施。

The cable - girder anchor structure is the key zone of tress analysis for concrete beam cable - stayed bridges. The cantilevered cable - girder anchorage structure is needed setting when the cantilever of cross section on double plane cable - stayed bridge is longer. The form that the stay - cable is anchored on web is mainly used in The current cable - girder anchor structure, but the form that the staycable is anchored on cantilevers is used less recently. The thesis analyzed the stress distribution laws in cantilevered cable - girder anchorage structure by the method of finite element, and proposed some effective measures improving excessive tensile stress by decorating prestressed reinforcements properly and reducing stress concentration.