节段模型弹簧悬挂颤振试验中的滞回现象研究

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【摘    要】：为了研究桥梁颤振运动的非线性特征，进行了平板节段模型弹簧悬挂风洞试验，通过调节系统的机械阻尼比，在不同阶段给予模型外部激励。结果表明：颤振除传统的“软颤振”与“硬颤振”模式外，还有第三种颤振即“颤振滞回”，系统的阻尼是引起“颤振滞回”的主要因素。

【关键词】：风洞试验；非线性颤振；平板节段模型；桥梁；阻尼比

【中图分类号】：U441.3 【文献标志码】：A 【文章编号】：1008-3197（2023）02-07-05

【DOI编码】：10.3969/j.issn.1008-3197.2023.02.002

Study on Hysteresis Phenomenon in Section Model Spring Suspension Flutter Test

LI Hongjie

（Tianjin Municipal Engineering Design & Research Institute Co. Ltd.，Tianjin 300392，China）

【Abstract】：In order to study the nonlinear characteristics of bridge flutter motion， this paper adopts the method of wind tunnel test of flat section model spring suspension， through adjusting the mechanical damping ratio of the system and giving external excitation to the model at different stages. The results show that in addition to the traditional vibration modes of "soft flutter" and "hard flutter"， there is a third kind of flutter， namely "flutter hysteresis"， the damping of the system is the main factor causing the "flutter hysteresis" phenomenon.

【Key words】：wind tunnel test; nonlinear flutter; plate section model; bridge; damping ratio

桥梁颤振是一种典型的由于气弹不稳定引起的桥梁风致振动响应，具有大振幅且弯扭耦合的特点，一旦出现极有可能导致桥梁损坏甚至坍塌。（剩余4288字）