双塔自锚式钢箱梁悬索桥自振特性研究

Research on Self-vibration Characteristics of Self-anchorage Steel Box Girder Suspension Bridge with Twin Towers

以韩土公路二号桥梁为工程背景,对双塔自锚式钢箱梁悬索桥的自振特性进行计算分析研究,利用ANSYS有限元分析软件建立全桥三维模型,计算出前20阶自振频率及振型。计算结果表明,主缆直接锚固在正交异性钢箱梁桥面上,与地锚式悬索桥及传统桥面相比,其自振特性存在很大差异。该桥型具有频谱密布、整体刚度较低、固有周期较长、在振动过程中具有振动一体化的特性。

Taking No.2bridge of Hantu highway as the engineering background,the research of calculation and analysis on the self-vibration characteristics of self-anchorage steel box girder suspension bridge with twin towers is made,the three-dimensional model of full-bridge is established by utilizing ANSYS finite element analysis software,and the natural vibration frequency and vibration model of the former20-order are calculated.The calculation results show that,the main cable is directly anchored on the orthotropic steel box girder bridge deck,which has large difference of self-vibration characteristics by comparing with earth anchored suspension bridge and traditional bridge deck.This type of bridge is with characteristics like dense frequency spectrum,lower integral rigidity,longer natural period,and vibration integration during the period of vibration.