刚性吊杆-水平抗风索耦合系统弯曲振动自振特性分析

发布时间：2018-02-27 12:31

本文关键词： 刚性吊杆水平抗风索等效弹簧弯曲振动自振频率振型　出处：《振动与冲击》2017年11期 　论文类型：期刊论文

【摘要】：将1对水平抗风索对钢拱桥刚性吊杆的约束作用简化为4个水平弹簧支撑,推导了抗风索等效弹簧刚度计算公式;基于欧拉-伯努利连续梁理论与吊杆-水平抗风索连接位置处的相容连续性条件,建立了刚性吊杆-水平抗风索耦合系统弯曲振动自振特性分析理论模型,通过与有限元结果对比验证了该方法的准确性;明确了水平抗风索位置、刚度参数对H型、矩形刚性吊杆纵桥向弱轴弯曲振动自振特性的影响规律。研究结果表明:合理设计的抗风索对H型、矩形刚性吊杆弱轴弯曲基频均有较大程度的提升,证实了抗风索对刚性吊杆弯曲模态减振的可行性;抗风索位置不同,对吊杆弱轴弯曲基频的影响程度也不同,且位置参数直接决定了吊杆弯曲基频增长极限值;相对H型吊杆,附加抗风索的矩形吊杆弱轴弯曲基频提升潜力更大。研究成果对钢拱桥刚性吊杆弯曲模态振动控制的水平抗风索减振参数优化设计具有重要参考价值。
[Abstract]:The constraint effect of 1 pair of horizontal wind resistant cables on rigid suspenders of steel arch bridge is simplified to 4 horizontal spring supports, and the equivalent spring stiffness calculation formula of wind resistant cables is derived. Based on the Euler-Bernoulli continuous beam theory and the consistent continuity condition at the position of the connection between the suspension rod and the horizontal wind resistant cable, a theoretical model for the analysis of the natural vibration characteristics of the bending vibration of the rigid suspension and horizontal wind-resistant wind cable coupling system is established. The accuracy of the method is verified by comparing with the finite element results, and the position of horizontal wind cable and the stiffness parameter of H-type are determined. The influence of rectangular rigid suspension rod longitudinal bridge on the natural vibration characteristics of weak axis bending vibration of rectangular rigid suspension rod is studied. The results show that the reasonably designed wind-resistant cable can greatly improve the fundamental frequency of H-type and rectangular rigid suspension rod with weak axis bending. It is proved that the anti-wind cable is feasible to the bending mode of rigid suspender, the influence degree of the anti-wind cable position on the base frequency of weak shaft bending is different, and the position parameter directly determines the limit value of the bending fundamental frequency growth of the suspender. The research results have important reference value for the optimization design of horizontal anti-wind cable vibration control of steel arch bridge rigid suspension rod bending mode vibration control.
【作者单位】：同济大学桥梁工程系;华北水利水电大学土木与交通学院;
【基金】：国家自然科学基金(51308214) 国家重点基础研究973计划(2015CB057702) 河南省教育厅科学技术研究重点项目(13A560711) 河南省高校科技创新团队支持计划(15IRTSTHN028) 河南省高等学校青年骨干教师资助计划(2015GGJS-104)
【分类号】：U441.3

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