摘要
针对西堠门大桥北索塔施工最大悬臂、成桥运营和成桥阶段百年一遇大风作用3种状态,建立索塔结构的空间计算模型。考虑0°和90°风偏角,分析索塔的风致内力响应及阵风响应系数。其中,静风引起的结构内力响应采用静力有限元法计算,脉动风引起的结构抖振内力响应采用动力有限元法和虚拟激励法计算。计算结果表明:在上述3种状态,随着塔柱标高的降低,塔柱风致弯矩响应呈现逐渐增大的趋势,而阵风响应系数呈现逐渐减小的趋势。
In order to analyze the longest cantilever status in construction, the bridge service status and the status under the strongest gale in a century of the north pylon of Xihoumen Bridge, three-dimensional finite element model of the pylon was established. Then, with consideration of 0° and 90° wind yaw angles, the wind-induced structural internal force responses and the gust response factors of the pylon were studied.The static wind-induced structural internal force responses were computed by the static finite element method, while the fluctuating wind-induced structural buffeting internal force responses were computed by the dynamic finite element method in conjunction with the pseudo-excitation method. The result shows that the wind-induced bending moment responses have a gradually increasing trend while the gust factors have a gradually decreasing trend with the pylon elevation declines in the above-mentioned three statuses.
出处
《公路交通科技》
CAS
CSCD
北大核心
2009年第6期64-68,共5页
Journal of Highway and Transportation Research and Development
基金
国家高技术研究发展计划(八六三计划)资助项目(2007AA11Z101)
交通部西部交通建设科技资助项目(200531800019
200631849426)
关键词
桥梁工程
结构风致内力响应
有限元法
虚拟激励法
索塔
阵风响应系数
bridge engineering
wind-induced structural internal force response
finite element method
pseudo- excitation method
pylon
gust response factor
