提高大跨度人行悬索桥抗风稳定性措施的效果分析

发布时间：2019-04-21 21:41

【摘要】：为研究各类抗风措施对提高大跨度人行悬索桥抗风稳定性的贡献,以某主跨430m的人行单跨悬吊地锚式悬索桥为背景,利用杆系有限元程序建立模型,对基本结构以及采用空间缆、增大梁重、拓宽梁端桥面、设置抗风缆等措施下,人行悬索桥的动力特性及抗风稳定性进行了分析。结果显示:颤振临界风速是人行悬索桥的设计控制风速;拓宽加劲梁梁端宽度,基本不能提高结构抗风稳定性;同时增大梁段重量150%和设置抗风缆对抗风稳定性的提升效果较好,均可达到30%以上;设置抗风缆后,明显提高了结构的竖弯基频和扭转基频,但也增加了养护和维修成本,影响桥下空间利用。
[Abstract]:In order to study the contribution of all kinds of anti-wind measures to the improvement of wind stability of long-span pedestrian suspension bridges, a model was established by using the finite element program of the bar system on the background of a pedestrian single-span suspension anchor suspension bridge with a main span of 430 m. In this paper, the dynamic characteristics and wind-resistant stability of pedestrian suspension bridge are analyzed by means of basic structure, using space cable, increasing beam weight, widening bridge deck at beam end, setting up wind-resistant cable, etc. The dynamic characteristics and wind-resistant stability of pedestrian suspension bridge are analyzed. The results show that the critical flutter wind speed is the design and control wind speed of the pedestrian suspension bridge, and widening the width of the end of the stiffened beam can not improve the wind stability of the structure. At the same time, increasing the weight of the beam by 150% and setting the wind-resistant cable to resist the wind stability have a better effect, both of which can reach more than 30%. The vertical bending fundamental frequency and torsional fundamental frequency of the structure are obviously increased by setting the wind resistant cable, but also the maintenance and maintenance costs are increased, which affects the utilization of the space under the bridge.
【作者单位】：中铁二院工程集团有限责任公司;中建六局桥梁有限公司;
【分类号】：U448.11;U448.25

【相似文献】