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以贵州思南岩头河大桥为工程背景,研究了不同边中跨比对不对称连续刚构桥动力特性的影响。在桥墩高度相同的情况下,逐渐减小左侧T构桥墩上主梁的长度,共形成6个不对称连续刚构桥模型,以Midas/Civil为辅助平台,分别对各模型进行了模态分析和反应谱分析,记录对比了各关键截面的内力。研究表明上部结构的不对称对主梁的横桥向自振特性影响较大,桥墩的顶部和底部是较危险截面,在抗震设计中需要进行加强。
Taking Sinan Yantou River Bridge in Guizhou Province as an example, the influences of different side-to-center span ratios on the dynamic characteristics of unsymmetrical continuous rigid frame bridge are studied. Under the condition of the same pier height, the length of the main girder on the left T-shaped piers is gradually reduced to form six asymmetric continuous rigid frame bridge models. Based on the Midas / Civil auxiliary platform, the modalities Analysis and response spectrum analysis, recording and comparing the internal forces of the key sections. The research shows that the asymmetry of the superstructure has a great influence on the natural vibration characteristics of the main girder. The top and bottom of the pier are more dangerous sections and need to be strengthened in the aseismic design.