支承形式对三跨部分斜拉桥动力特性的影响研究

Research about bearing mode impact on dynamic characteristics of three-span PC partly cable-stayed bridge

本文以国内首座公路三跨预应力混凝土部分斜拉桥为背景桥,建立有限元动力分析模型,通过改变部分斜拉桥的支承形式,研究支承形式对三跨部分斜拉桥动力特性的影响情况,并通过与其它桥梁体系的比较,揭示三跨部分斜拉桥的动力特点。分析结果表明,支承形式的变化,对振型、频率均有较大影响。研究成果,可为三跨部分斜拉桥的抗震设计提供参考。

This paper based on a two -pylon -three -span PC partly Cable -stayed bridge, by changing the coupling mode between girder, pylon and pier, the rules of bearing mode impact on dynamic characteristics the new bridge system are disclosed. Then, by compared with traditional cable - stayed bridge and continuous beam bridge, the dynamic characteristics of partly Cable - stayed bridge are presented.