索梁锚固区有限元模型的建立及力学分析—以香山大桥为例

Stress Analysis and Structural Optimization of Cable Beam Anchorage Zone of Xiangshan Bridge

大跨度斜拉桥双层钢桁梁索梁锚固区为空间受力构件,索力是同等跨径斜拉桥索力的两倍以上,锚固区板件受力很大。以香山大桥为依托,对其最长索和最短索分别建立局部有限元模型,分析了最大索力作用下主梁锚固区钢锚箱的应力分布规律,并研究了钢锚箱在设置端板、设置腹板外加劲对锚固区受力的影响,为锚固设计提供依据。

The cable beam anchorage zone of double-layer steel truss beam of long-span cable-stayed bridge is a spatial stress component,and the cable force is more than twice that of cable-stayed bridge with the same span,and the plate in the anchorage zone is under great stress.Based on Xiangshan bridge,this paper establishes localfinite element models for the longest cable and the shortest cable respectively,analyzes the stress distribution law of the steel anchor box in the anchorage area of the main beam under the action of the maximum cable force,and studies the influence of the steel anchor box on the stress of the anchorage area when the end plate and the external stiffener of the web are set,so as to provide a basis for the anchorage design.