斜交高墩大跨度连续箱梁桥动力特性及其颤振分析

发布时间：2018-03-17 16:13

本文选题：斜交高墩　切入点：大跨度　出处：《铁道科学与工程学报》2014年02期 　论文类型：期刊论文

【摘要】：以湖南省张花高速公路酉水大桥(80+145+80)m斜交高墩大跨度悬臂浇筑预应力混凝土连续箱梁桥为工程背景,运用有限元方法分析斜交高墩大跨度连续箱梁桥在最高墩施工阶段、最大悬臂施工阶段以及成桥阶段的动力特性,对比HBM动力测试仪现场测试的自振特性,对桥梁结构的刚度进行评价;计算桥梁结构的颤振临界风速,分析桥梁在自然风作用下的颤振稳定性。研究结果表明:桥梁在3个施工阶段纵向刚度最小,最大悬臂施工阶段扭转刚度最小,为自然风颤振最不利阶段,其颤振临界风速大于颤振检验风速,桥梁结构颤振稳定。
[Abstract]:Taking Youshui Bridge of Zhanghua Expressway in Hunan Province as the engineering background, the prestressed concrete continuous box girder bridge with large span cantilever with skew high pier and high pier is used as the engineering background. The finite element method is used to analyze the construction stage of the long span continuous box girder bridge with skew high pier in the period of maximum pier construction. The dynamic characteristics of the maximum cantilever construction stage and the bridge completion stage are compared. The stiffness of the bridge structure is evaluated by comparing the natural vibration characteristics measured by the HBM dynamic tester, and the flutter critical wind speed of the bridge structure is calculated. The flutter stability of the bridge under the action of natural wind is analyzed. The results show that the longitudinal stiffness of the bridge is the smallest in three construction stages, and the torsional stiffness in the maximum cantilever construction stage is the least, which is the most unfavorable stage of natural wind flutter. The flutter critical velocity is larger than the flutter test wind speed, and the bridge structure flutter stability.
【作者单位】：中南大学土木工程学院;
【基金】：湖南省科技交通计划项目(201022)
【分类号】：U441.3

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