桁式组合拱桥动力特性及动力荷载试验分析

以花鱼洞大桥为例,利用大型通用有限元程序ANSYS建立了该桥的三维实体有限元模型,进行了动力特性理论计算,对振型特点进行了分析,对大桥进行了动力特性和动力响应检测。并提出了改善空实腹交接处冲击效应的设计构造措施以及改善桥梁振感的设计思路。

Theory of Dynamic Behaviors of Arch Bridges of Trussed Combination and Testing Analysis of Dynamic Loading

With the help of the large-scale general finite element program ANSYS,a three-dimensional finite element model of Huayudong Bridge is established,the theoretical computation of the dynamic behavior is carried out,the vibration characteristics are analyzed and the dynamic behavior and dynamic responses are tested.The theoretical analysis and experimental results show that the computation re-sults and the testing results are in good agreement,the fundamental frequency of the structure is 1.079Hz,the structure stability is affected by the lateral stiffness,there are obvious vibration and impact effects.Measures to improve the impact effect of the joint structures and ideas toimprove the vibration of the bridge are proposed.The results and conclusions may give technological indexes and bases to the design,con-struction,health testing and maintenance of arch bridges of trussed combination.