强震作用下冰厚对桥墩动力反应的影响研究

发布时间：2018-03-17 12:13

本文选题：桥涵工程　切入点：冰厚　出处：《岩石力学与工程学报》2014年S1期 　论文类型：期刊论文

【摘要】：在考虑了冰水桥墩流固耦合作用的基础上,建立地震作用下不同冰厚时的冰水桥墩流固耦合动力方程,并以冰水域中矩形桥墩为研究对象,分析地震作用下冰厚对矩形桥墩动力响应及动水压力的影响。结果表明:地震作用下,墩底最大弯矩和剪力以及桥墩侧面动水压力随着冰厚的增加而增大,且当冰厚超过0.5 m时,墩底弯矩和剪力随着冰厚的增加影响程度越来越大,墩底最大弯矩和剪力变化率分别相差88.71%和98.15%,但对桥墩侧面动水压力已基本无影响。墩身位移与加速度随着冰厚的增大而增大,其中墩身加速度变化率最大达到45.08%。因此,在进行冰水域桥墩抗震设计时应着重考虑冰厚大于0.5 m时对结构地震反应的影响。
[Abstract]:On the basis of considering the fluid-solid coupling action of the bridge piers, the dynamic equations of fluid-structure coupling of the bridge piers with different ice thickness under seismic action are established, and the rectangular piers in the ice water domain are taken as the object of study. The effect of ice thickness on the dynamic response and hydrodynamic pressure of rectangular bridge pier under earthquake is analyzed. The results show that the maximum bending moment and shear force at the bottom of the pier and the dynamic water pressure on the side of the pier increase with the increase of ice thickness. When the ice thickness is more than 0.5 m, the bending moment and shear force at the bottom of the pier become more and more important with the increase of ice thickness. The maximum bending moment and shear rate of pier bottom are 88.71% and 98.15, respectively, but they have no effect on the lateral dynamic pressure of pier. The displacement and acceleration of pier increase with the increase of ice thickness, and the maximum change rate of pier acceleration is 45.08. In seismic design of bridge piers in icy waters, the influence of ice thickness greater than 0.5 m on seismic response of structures should be taken into account.
【作者单位】：北京科技大学土木与环境工程学院;
【基金】：国家自然科学基金资助项目(51078033,51178045) 教育部海外名师项目(MS2011BJKJ005)
【分类号】：U443.22;U442.55

【相似文献】