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分离式承台摇摆抗震及其有限元模拟

DOI: 10.3969/j.issn.1006-7043.201402035

Keywords: 分离式承台|摇摆抗震|自复位|抗震设计|桥梁

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Abstract:

为了提供一种桥梁抗震的可选方案, 根据摇摆抗震的基本思想, 阐述了自复位分离式承台的构想, 将传统桥梁桩基础的承台一分为二, 使承台上部能够在地震作用下摇摆, 从而在基础部位隔断地震传播途径, 达到减隔震的目的。分析了该抗震方法的抗震原理, 阐释了该抗震方法可能采用的各种构造工艺与施工方式。传统的摇摆抗震数值模拟技术将摇摆接触面区域视为刚体, 不考虑接触面的弹性变形, 与实际情况不符, 故采用了将摇摆区域(文中为承台)采用三维实体有限元模拟的精细化建模方法, 并与传统的建模方法进行对比。分析表明:在现有的桥梁抗震设计技术与施工技术支持下, 分离式承台具有工程应用的可能性, 在有限元模拟中, 将摇摆区域视为刚体的做法会放大结构的位移响应, 是一种偏保守的做法。

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