混凝土自锚式悬索桥鞍座的精细化模拟方法

Refined analysismethod of saddle for self-anchored concrete suspension bridge

为了准确考虑鞍座对自锚式悬索桥缆索体系的影响,提出鞍座的精细化模拟方法,并建立了全桥有限元模型,对精细化模型和解析程序的计算精度进行了对比分析,研究了鞍座模拟精细化程度对主缆线形的影响。结果表明:本文提出的鞍座精细化模拟方法能准确反映缆索体系受力状况,体系转换计算时无需人为修正鞍座与切点位置,计算结果与解析程序吻合度高。鞍座对主缆线形的计算结果影响较大,计算时不可直接用理论交点代替。

To consider the influence of saddle accurately on the cable system of self-anchored suspension bridge, a refined simulation method of the saddle is presented. Through establishing finite element （ FE） model of the whole bridge, the comparison analysis of calculation accuracy between refined model and analytical procedures is implemented. Meanwhile, the influence of the degree of refined saddle simulation on curve of main cable is studied. The results show that the proposed refined method of saddle model can accurately reflect the stress status of the cable system. The computation results agree well with analytical results. It is not necessary to refine the contact point;the saddle cannot be instead of analytical crossover point due to the significant influence of saddle on calculation result of main cable curve.