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。
Based on the fluid-structure coupling of ice-water-bridge pier,the paper establishes the ice-water-bridge pier fluid-structure interaction dynamic equation of different ice thicknesses under earthquakes,and studies the effect of ice thickness on dynamic response and hydrodynamic pressure with a rectangular pier as the research object. The result shows that,under the seismic loading,the larger the ice thickness,the greater the bending moment and shear farce at the bottom,the greater the hydrodynamic pressure at the side of the pier. When the ice thickness is more than 0.5 m,ice thickness of pier has more remarkable effect on bending moment and shear farce of the bottom,and the rate of bending moment and shear fore at the bottom are 88.71% and 98.15%,respectively, but has nearly no effect on the hydrodynamic pressure in the side of the pier. At the same time,the larger the ice thickness,the greater the displacement and acceleration along the pier. Therefore,the bridge seismic design in the ice water should consider the seismic response of structure influence when the ice thickness is more than 0.5 m.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2014年第S1期2758-2764,共7页
Chinese Journal of Rock Mechanics and Engineering
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)
关键词
桥涵工程
冰厚
桥墩
流固耦合
动水压力
动力响应
bridge engineering
ice thickness
bridge pier
fluid-structure coupling
hydrodynamic pressure
dynamic response
