论文部分内容阅读
为了研究大跨径钢箱桁架拱桥成桥状态的动力特性,以某长江大桥为依托,用大型有限元程序建立全桥计算模型,得出了全桥的基本动力特征,并分析了主拱抗弯刚度、横向联系的形式及刚度、吊索刚度、加劲梁抗弯刚度、立柱抗推刚度等参数对结构动力特性的影响规律。结果表明:该桥面外刚度较小,动力响应以侧弯振型为主;全桥刚度主要由受力结构——主拱提供,而传力结构的加入对全桥刚度贡献不大,反倒增加了结构自重,使得全桥固有频率降低。
In order to study the dynamic characteristics of large-span steel truss arch bridge into a bridge state, based on a Yangtze River Bridge, a large-scale finite element program was used to establish a full-bridge calculation model, and the basic dynamic characteristics of the full bridge were obtained. Bending stiffness, horizontal contact form and stiffness, sling stiffness, stiffening beam bending stiffness, column stiffness and other parameters on the dynamic characteristics of the structure. The results show that the stiffness of the bridge deck is small and the dynamic response is mainly of bending modes. The stiffness of the full bridge is mainly provided by the stress structure-main arch, while the contribution of the force transmission structure does not contribute much to the stiffness of the full bridge. Increase the weight of the structure, making the full bridge reduce the natural frequency.