桥梁断面涡激振动气动效应特性识别

发布时间：2018-01-13 07:28

本文关键词：桥梁断面涡激振动气动效应特性识别　出处：《哈尔滨工业大学学报》2017年03期 　论文类型：期刊论文

【摘要】：为获取桥梁断面涡激共振过程中的气动效应特性,提出一种基于风洞试验的气动效应特性识别方法,首先提出涡振系统总体阻尼及刚度瞬时特性识别方法,在此基础上提出从涡振系统总体阻尼及刚度中分离气动阻尼及气动刚度的方法.以一个开口断面风洞试验数据为例对该方法的准确性进行了验证,并对该断面涡振气动效应特性进行研究.结果表明:识别得到的系统总体阻尼比为零的等高线与结构涡振响应曲线能很好吻合,从而验证了该方法的准确性.在此基础上对涡振过程中作用于结构的气动阻尼及气动刚度特性进行了研究,获得了气动阻尼及刚度随结构振幅和约化风速的变化规律,可为后续理论模型研究提供参考.
[Abstract]:In order to obtain the aerodynamic effect characteristics of bridge section vortex-induced resonance (VSR), a method based on wind tunnel test is proposed to identify the aerodynamic effect characteristics. Firstly, a method for identifying the total damping and stiffness characteristics of a vortex vibration system is proposed. On this basis, a method of separating aerodynamic damping and aerodynamic stiffness from the total damping and stiffness of vortex vibration system is proposed, and the accuracy of the method is verified by an open section wind tunnel test data. The aerodynamic characteristics of the vortex vibration of this section are studied. The results show that the contour line with zero total damping ratio of the system is in good agreement with the vortex vibration response curve of the structure. On the basis of this, the aerodynamic damping and aerodynamic stiffness characteristics of the structure acting on the vortex vibration are studied. The variation of aerodynamic damping and stiffness with the amplitude and reduced wind speed of the structure is obtained, which can be used as a reference for further theoretical model research.
【作者单位】：土木工程防灾国家重点实验室(同济大学);北京工业大学道路与桥梁工程研究所;
【基金】：国家重点基础研究发展计划(2013CB036300)
【分类号】：U441.3
【正文快照】： 涡激振动是一种广泛存在于工程领域的非线性振动现象.已有健康监测资料表明,大跨度桥梁较易出现涡激振动现象[1-3],必须在设计阶段对其涡振性能进行准确研究.现有涡振研究仍需依赖物理风洞试验手段,通过弹性悬挂节段模型或全桥气弹模型对其涡振性能进行判定[4-5].然而由于模型

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