大跨度斜拉桥钢锚箱式索梁锚固结构空间有限元模型比较研究

Comparison and analysis of 3D-finite-element models of steelanchor-box at the cable-girder anchorage zone for long-span cable-stayed bridge

在进行大跨度斜拉桥钢锚箱式索梁锚固结构空间非线性仿真分析时,有限元模型的正确与否至关重要。由于目前软硬件能力的限制,只能采用锚箱局部模型进行分析,而模型中选取的结构范围及边界条件的不同,都会直接影响锚固区分析结果。通过对不同的有限元模型进行研究比较,得到合理的建模方法,用以判断实际结构中索梁锚固区的安全储备。这种仿真分析可以用于设计选型、锚箱研究及指导模型试验。

It is quite important to choose right and rational finite-element model when doing 3-dimensional nonlinear analysis to steel- anchor-box at the cable-girder anchorage zone for long-span cable-stayed bridge. But with the limitation of practical software and hardware, only the local-zone model can be adopted to analyze. And the results of analysis are influenced evidently by the finite-element models＇ size and boundary condition. The more reasonable method can be gained by comparing different models, which can be used to estimate the safety of practical steel-anchor-box of cable-girder anchorage. Furthermore, this method can be applied for designing and choosing type, researching and guiding model test.