基于尾流振子模型的桥梁节段至实桥涡激共振振幅转换关系

发布时间：2018-02-24 07:25

本文关键词： 涡激振动尾流振子模型节段模型实桥振幅转换　出处：《工程力学》2017年02期 　论文类型：期刊论文

【摘要】：该文基于一种用于涡振模拟的两自由度经验模型(尾流振子模型)推导了桥梁节段至实桥涡振振幅转换关系。首先介绍了尾流振子模型的形式及其特点,其次从展向全相关及展向不完全相关两方面推导了节段至实桥涡振振幅转换关系,最后结合实际桥梁对上述过程进行了算例验证,并与现场实测结果进行了比较。研究表明:当不考虑涡激力展向相关性影响时,节段至实桥涡振振幅只与结构振型函数有关,尾流振子模型得到的转换关系与传统经验非线性模型得到的转换关系相同;当考虑涡激力展向相关性时,计算得到的实桥涡振振幅可能小于节段模型结果,涡激力展向全相关条件下得到的计算结果与现场实测结果更接近。因此,当缺少精确的涡激力展向相干函数时,假定涡激力展向全相关计算得到的实桥涡振振幅可能更为可靠。
[Abstract]:Based on an empirical model of two degrees of freedom (wake oscillator model) used in vortex vibration simulation, this paper deduces the relationship between the amplitude of vortex vibration of bridge segment and that of real bridge. Firstly, the form and characteristics of wake oscillator model are introduced. Secondly, the amplitudes conversion relation of vortex vibration from segmental to real bridge is deduced from the two aspects of full correlation and incomplete correlation. Finally, the numerical examples are given to verify the above process. The results are compared with the measured results in the field. The results show that the amplitude of the vortex vibration is only related to the vibration function of the structure when the spanned correlation of vortex-induced forces is not taken into account. The conversion relation obtained by wake oscillator model is the same as that obtained by traditional empirical nonlinear model, and the calculated amplitude of vortex vibration of real bridge may be smaller than that of segmental model when the spanned correlation of vortex-induced forces is considered. The calculated results are closer to the measured results under the condition of full correlation of vortex-induced forces. Therefore, in the absence of an accurate spanned coherent function of vortex-induced forces, it is assumed that the amplitude of vortex-vibration obtained by the full-correlation calculation of spanned vortex-induced forces may be more reliable.
【作者单位】：同济大学土木工程防灾国家重点实验室;
【基金】：国家重点基础研究发展计划(973)项目(2013CB036300) 国家自然科学基金重点项目(51323013)
【分类号】：U441.3

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