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22.抗风缆对大跨度悬索桥的抗风静力效果研究

日期：2013-12-25 12:00:00 点击：

方治华¹，魏明星¹，盛明清²

(1.内蒙古科技大学建筑与土木工程学院，内蒙古包头 014010；2.北京多维联合集团，河北香河 065400）

关键词：大跨度悬索桥；抗风缆；静风稳定性；临界风速；失稳

中国分类号：U411.3 文献标识码：A

摘要：在悬索桥有限元模型上加抗风缆，施加风荷载，用二维线性方法计算桥梁临界失稳风速,计算在不同风荷载下跨中节点的横向、竖向和扭转位移。通过比较施加抗风缆前后桥梁跨中的响应表明：侧向位移显著减小，横向屈曲临界风速有所提高，表明侧向刚度增加;但竖向位移增大，通过比较加缆前后跨中节点的位移表明，加缆后失稳有所提前,扭转临界风速失稳风速有所降低.

Effect of wind cable on the wind resisting static stability for long suspension bridge

Fang Zhi-hua , Wei Ming -xing, Sheng Ming-qing

(1.Architecture and Civil Engineering School,Inner Mongolia University of Scien-ce and Technology，Baotou 014010，China；2.Beijing duowei unity group ,xianghe hebei 065400, China)

Keywords: long-span suspension bridge；wind cable；aerostatic stability；critical wind speed；instability

Abstract: Wind cable and wind load were applied on the finite element of suspension bridges, the two-dimensional linear method was used to calculate the critical instability wind velocity of Bridges and calculated under different wind load across nodes in the horizontal, vertical and torsional displacement. The comparisons of the response which before and after applied the wind cable bridge show that the lateral displacement decreased significantly, Show lateral stiffness increased. ， but vertical displance increased .The comparisons of the displacement across nodes which before and after applied the wind cable bridge show that instability after the cable was added in advance, the critical wind speed of lateral buckling increased, but still far greater than the wind speed may appeared on earth.