大跨外倾式拱桥动力特性分析研究

Analysis and Study of Dynamical Characteristic of Large-span Extroversion Arched Bridge

桥梁自振特性是其动力分析的重要参数,包括自振频率、振型及阻尼比,它们取决于结构的组成、刚度、质量分布及约束条件。要研究桥梁结构的抗震、抗风等动力性能,必须了解桥梁结构的自振特性。大跨度外倾式拱桥的结构构造比较复杂,其动力特性与一般的拱桥不同。该文通过对某外倾式拱桥的动力特性分析,为该桥抗震分析提供参考和依据。

The self-vibration characteristic of bridge is the important parameter of its dynamic analysis including the self-vibration frequency, vibration type and damp ratio. These parameters lie on the structure composition, rigidity, quality distribution and restricting condition. To study the anti- earthquake and anti-wind dynamic performances must understand the self-vibration characteristics of bridge structure. The structural construction of large-span extroversion arched bridge is more complicated. Its dynamic characteristic is different from the general arched bridge. Thearticle analyzes the dynamic characteristic of an extroversion arched bridge to provide the reference and basis for the anti-earthquake analysis of this bridge.