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为了研究中央扣对独塔地锚式悬索桥动力特性及地震响应的影响,该文以云南丽江-香格里拉高速公路金沙江大桥为研究对象,分别建立无中央扣、柔性中央扣、刚性中央扣3种模型,采用多重Ritz向量法和反应谱法分别计算3种模型的动力特性和地震响应,对比3种模型计算结果得出结论:中央扣的设置对限制加劲梁纵桥向振幅效果显著,同时改变了纵向地震力在两岸的分配,直接锚于山体一岸锚碇纵向地震力增加,独塔纵向地震力降低。
In order to study the influence of the central buckle on the dynamic characteristics and the seismic response of an anchored suspension bridge with a single tower, this paper takes the Jinsha River Bridge in Lijiang-Shangri-La Expressway in Yunnan as the research object and establishes three kinds of central buckles, flexible central buckles and rigid central buckles, respectively Model. The dynamic characteristics and the seismic responses of the three models were calculated respectively by multiple Ritz-vector and response spectrum methods. Comparing the calculated results of the three models, it was concluded that the setting of the center buckle has a significant effect on limiting the longitudinal amplitude of the stiffening girder, Longitudinal seismic force in the distribution of the two sides, the anchor directly anchored in the mountain shore, an increase of longitudinal seismic force, single tower vertical seismic force decreases.