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以武汉在建天兴洲大桥南岸引线某大跨径连续刚构桥为研究对象,考虑桩-土-结构共用作用情况,运用大型有限元分析程序ANSYS对其动力特性进行了分析,得到了成桥状态下结构的自振特性及累计振型参与质量比,确定了运用反应谱法对地震作用进行振型组合时所必需的振型阶数。对该桥进行了地震反应谱分析,得到各概率地震作用下结构的反应最大值,并根据“三水准”设防原则,分析评价了该桥的综合抗震性能,为该桥的建设和抗震设计提供了参考,也为进一步研究该类桥型的抗震性能提供了分析基础。分析结果表明,该桥具有足够的抗震能力,能够满足预期的设计性能。
Taking the long-span continuous rigid frame bridge of the south bank of Tianxingzhou Bridge under construction in Wuhan as the research object, considering the common action of pile-soil-structure, the dynamic finite element analysis program ANSYS was used to analyze the dynamic characteristics. The self-vibration characteristics of the structure under the bridge state and the mass ratio of the cumulative mode shapes are involved. The order of the mode shapes necessary for the combination of the mode shapes by response spectrum method is determined. The seismic response spectrum analysis of the bridge was carried out to obtain the maximum response of the structure under various probabilistic earthquakes. Based on the “three levels” fortification principle, the comprehensive seismic performance of the bridge was analyzed and evaluated for the construction and earthquake resistance of the bridge Design provides a reference, but also to further study the seismic performance of this type of bridge provides the basis for analysis. The analysis results show that the bridge has sufficient seismic capacity to meet the expected design performance.