多索-梁结构固有振动特性分析

发布时间：2018-02-27 17:44

本文关键词： 桥梁工程固有振动试验有限元法多索-梁结构斜拉索简化公式　出处：《工程力学》2017年01期 　论文类型：期刊论文

【摘要】：进行了单索-梁结构和二索-梁结构模型固有振动试验,采用斜拉桥整体动力分析有限元方法建立了索梁结构有限元模型,与试验结果进行的比较验证了所建有限元模型的正确性。通过对单索-梁结构至四索-梁结构的固有振动特性的有限元分析表明,斜拉索的存在和数量对索梁结构的面内固有频率影响较大,对面外固有频率影响很小;斜拉索的增加使索梁结构面内振动频率增大的主要原因是斜拉索对主梁起到竖向支承的作用。将斜拉索竖向支承作用简化为弹性支撑,考虑斜拉索水平分力对主梁轴力的影响,推导得到了多索-梁结构面内固有振动的频率方程和振型函数,与有限元计算结果进行的对比说明了所得简化公式的正确性和适用性。
[Abstract]:The natural vibration tests of single cable-beam structure and two-cable-beam structure are carried out, and the finite element model of cable-beam structure is established by using the finite element method of overall dynamic analysis of cable-stayed bridge. The comparison with the experimental results verifies the correctness of the proposed finite element model. The finite element analysis of the natural vibration characteristics of the single cable beam structure to the four cable beam structure shows that, The existence and quantity of cable have great influence on the in-plane natural frequency of cable-beam structure, but have little effect on the external natural frequency of cable-beam structure. The main reason for the increase of in-plane vibration frequency of cable-beam structure is that the cable-stayed cable plays a vertical supporting role on the main beam. The vertical support of the cable-stayed cable is simplified as elastic support, and the influence of the horizontal component force of the stay cable on the axial force of the main beam is considered. The frequency equation and mode function of in-plane natural vibration of multi-cable beam structure are derived and compared with the results of finite element calculation. The correctness and applicability of the simplified formula are illustrated.
【作者单位】：福州大学土木工程学院;福州大学至诚学院;
【基金】：教育部“新世纪优秀人才支持计划”项目(NCET-13-0737)
【分类号】：U441.3

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