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斜拉桥的动力特性分析是研究斜拉桥动力行为的基础,其自振特性决定其动力反应的特性,单塔斜拉桥作为一种新型的斜拉桥结构形式,其动力特性不同于传统的双塔斜拉桥。文章应用大型有限元程序Midas/Civil对营口民生路大桥进行动力分析,得到了非对称弯单塔斜拉桥的一些动力特性,为同类型桥梁的动力特性分析提供参考。采用标准反应谱作为输入的谱曲线,在频遇地震、多遇地震、罕遇地震情况下,考虑了纵向、横向、竖向输入下该桥的地震响应,分析了其抗震性能。计算结果表明,本桥的杭震能力是有保证。
The dynamic characteristics analysis of cable-stayed bridge is the basis for studying the dynamic behavior of cable-stayed bridge. The natural vibration characteristics of the cable-stayed bridge determine its dynamic response characteristics. As a new type of cable-stayed bridge structure, single tower cable-stayed bridge has different dynamic characteristics from traditional Twin towers cable-stayed bridge. In this paper, the dynamic analysis of Yingkou Minsheng Road Bridge is carried out by using the large finite element program Midas / Civil. Some dynamic characteristics of asymmetric single-pylon cable-stayed bridge are obtained, which can provide references for the dynamic characteristics analysis of similar bridges. Using the standard response spectrum as the input spectral curve, the seismic response of the bridge under longitudinal, transverse and vertical input is considered and its seismic performance is analyzed under frequent earthquakes, frequent earthquakes and rare earthquakes. The calculation results show that the capacity of the bridge is guaranteed.