摘要
为了探究中央扣对人行玻璃悬索桥动力及抗震性能的影响,以某景区人行悬索桥为工程背景,利用Midas Civil建立三维有限元模型,分别进行动力特性和地震响应分析,得出悬索桥主要构件在无中央扣、一联柔性中央扣、一联刚性中央扣、三联柔性中央扣、三联刚性中央扣等五种情况下内力和位移的变化规律。结果表明:在动力性能方面,刚性中央扣对悬索桥整体刚度均有提升作用,柔性中央扣仅在竖弯和扭转方面有明显提升作用,并对这五种情况的影响程度进行排序。在抗震性能方面,三联柔性中央扣对减小主缆跨中轴力最有效;从对桥塔的影响考虑,柔性中央扣优于刚性;从减小加劲梁跨中位移考虑,顺桥向地震作用下三联柔性中央扣最优,横桥向地震作用下三联刚性中央扣的方案最佳。最后推荐在此类型悬索桥上使用三联柔性中央扣。
In order to explore the influence of the central buckle on the dynamic and seismic performance of the pedestrian glass suspension bridge,a three-dimensional finite element model was built by Midas Civil in the background of a certain scenic area pedestrian suspension bridge,and the dynamic characteristics and seismic response were analyzed respectively,the variation law of internal force and displacement of the main components of suspension bridge without central buckle,one flexible central buckle,one rigid central buckle,three flexible central buckle and three rigid central buckle were obtained.The results show that the rigidity of the suspension bridge is enhanced by the rigid central buckle,and the flexibility central buckle is enhanced only by the vertical bending and torsion.In terms of seismic performance,the triple flexible center buckle is the most effective to reduce the axial force of the main cable span;considering the effect on the bridge tower,the flexible center buckle is superior to the rigid one;considering the decrease of the mid-span displacement of the stiffening beam,the three-joint flexible central buckle is the best under the longitudinal bridge earthquake,and the three-joint rigid central buckle is the best under the transverse bridge earthquake.Finally,it is recommended to use three-joint flexible central buckle on this type of suspension bridge.
作者
薛辉
XUE Hui(The Fifth Survey and Design Institute Group Co.Ltd. of China Railway,Beijing 102600,China)
出处
《国防交通工程与技术》
2021年第5期38-42,共5页
Traffic Engineering and Technology for National Defence
关键词
悬索桥
中央扣
动力特性
抗震性能
suspension bridge
central buckle
dynamic characteristics
seismic performance
