论文部分内容阅读
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。
The natural vibration tests of the single cable-beam structure and the second cable-beam structure model were carried out. The finite element model of the cable-stayed beam was established by using the finite element method of the whole dynamic analysis of cable-stayed bridge. Compared with the experimental results, the finite element model Correctness The finite element analysis of the natural vibration characteristics of single cable-beam structure to the fourth cable-beam structure shows that the existence and number of stay cables have a great influence on the natural frequency of the cable-stayed beam structure and have little effect on the inherent frequency ; The main reason that the increase of stay cables makes the frequency of vibration in the plane of the cable girder structure is that the stay cables play the role of vertical support to the girder. Considering the influence of horizontal component of stay cable on axial force of main girder, the frequency equation and mode function of natural vibration in multi-cable-girder structure are deduced. Compared with the finite element method The comparison of the meta-calculation results shows the correctness and applicability of the simplified formulas.