桥梁涡振幅值响应质量阻尼敏感性影响研究-《高速铁路技术》

文章信息/Info

Title:: On the Sensitivity of Mass Damp on the Amplitude Response of Vortex-induced Vibration for Bridges

作者:: 周帅; 邹云峰; 方聪; 牛华伟; 1. 中国建筑股份有限公司, 北京 100013;
2. 湖南大学, 长沙 410082;
3. 中南大学, 长沙 410075

Author(s):: ZHOU Shuai; ZOU Yunfeng; FANG Cong; NIU Huawei; 1. China State Construction Engineering Co., Ltd., Beijing 100013, China;
2. Hunan University, Changsha 410082, China;
3. Central South University, Changsha 410075, China

Keywords:: blunt member|vortex-induced amplitude|mass|damping|single parameter

摘要:: 为研究质量、阻尼对桥梁钝体构件涡振幅值响应影响的独立性和敏感性，本文以一组矩形截面杆件节段模型为基础，通过调整模型系统等效质量、阻尼、刚度，实现单参数研究工况设计，开展测振风洞试验，实测涡激共振幅值响应并进行对比研究。试验实测了单参数变化节段模型系统等效质量、阻尼、以及相同Scruton数不同质量阻尼参数组合工况下的涡激共振响应曲线。研究表明：（1）相同Scruton数不同质量、阻尼量值组合对比工况中，实测涡振幅值大小各不相同，最大最小比值达到2.7，涡振幅值质量、阻尼敏感性不相同；（2）质量、阻尼单参数对比研究工况中，实测涡振幅值随着质量、阻尼的增大而减小，权重系数不同，质量对于涡振幅值的影响程度大于阻尼；（3）提高等效质量是降低结构涡振幅值更为有效的措施。

Abstract:: In order to study the independence and sensitivity of the influences of mass and damping on the amplitude response of vortex-induced vibration of the blunt members of bridge structure, this paper takes a section model of rod with rectangular section as the basis, designs several cases by adjusting the equivalent mass, damping, and stiffness of the model system for single parameter study, and carries out the wind tunnel tests to measure and compare the amplitude responses of vortex-induced resonance. The response curves of vortex-induced resonance of the model system with the change of single parameter (equivalent mass, damping, and stiffness), as well as those with different combinations of mass and damping but the same Scruton number, were plotted in the test. The results show that: (1) For the cases with different combinations of mass and damping but the same Scruton number, the measured vortex amplitude value varies accordingly, with the ratio of the maximum and the minimum values up to 2.7, and the sensitivities of vortex amplitude to mass and damping are different. (2) For the cases with the change of single parameter (mass and damping), the measured vortex amplitude decreases with the increase of mass and damping, with different weight coefficients, where the influence of mass on vortex amplitude is greater than that of damping. (3) Increasing the equivalent mass is a more effective measure to reduce the structural vortex amplitude.