大跨悬索桥尖顶型主缆施工对猫道静风稳定性的影响

发布时间：2018-04-16 10:00

本文选题：悬索桥 + 主缆　；参考：《防灾减灾工程学报》2017年05期

【摘要】：在大跨径悬索桥施工期间,主缆与猫道间存在气动干扰效应,施工期主缆易发生驰振失稳,猫道易发生静风失稳。为了同时保证施工期主缆和猫道的稳定性,以某大跨径悬索桥施工期尖顶型主缆和猫道为背景,采用能够保证施工期主缆驰振稳定性的猫道参数设置方法,利用流体力学软件Fluent和有限元软件ANSYS数值研究了考虑施工期尖顶型主缆影响的猫道三分力系数和静风稳定性。结果表明:主缆施工期不同工况对猫道三分力系数影响较大;猫道静风失稳临界风速随着尖顶型主缆的施工先变小后增大,在成桥阶段又变小;主缆的不同施工顺序既影响主缆施工期的驰振性能又影响猫道静风稳定性,施工时要统筹考虑。
[Abstract]:During the construction of the long-span suspension bridge, there is aerodynamic interference effect between the main cable and the cat track, the main cable is prone to galloping instability during the construction period, and the cat track is prone to static wind instability.In order to ensure the stability of the main cable and the catwalk during the construction period, taking the spire type main cable and the catwalk of a long-span suspension bridge as the background, the method of setting the parameters of the catwalk which can ensure the stability of the galloping vibration of the main cable during the construction period is adopted.The hydrodynamic software Fluent and finite element software ANSYS are used to numerically study the three-point force coefficient and static wind stability of catwalk considering the effect of spire type main cable during construction.The results show that the influence of different working conditions on the three-point force coefficient of the catwalk is great, and the critical wind speed of the static wind instability of the catwalk decreases first and then increases with the construction of the spire main cable, and then decreases at the stage of bridge completion.The different construction sequence of the main cable not only affects the galloping performance of the main cable during the construction period, but also affects the static wind stability of the catwalk, which should be considered as a whole in construction.
【作者单位】：郑州大学土木工程学院;
【基金】：国家自然科学基金项目(51778587) 河南省自然科学基金项目(162300410255) 郑州大学优秀青年教师发展基金(1421322059) 河南省交通运输厅科技项目(2016Y2-2,2018J3)资助
【分类号】：U448.25

【相似文献】