摘要
斜拉索由于其轻、柔的特点,经常在外部环境的影响下产生较大的振动,从而对桥梁的力学性能产生影响。以赤石大桥为工程背景,采用不同的斜拉索单元建立了不同的四塔斜拉桥整桥有限元模型,对桥梁的变形、频率、模态等力学性能进行了系统地研究。采用弦振动理论计算出了斜拉索的自振频率与ANSYS算出的索单独振动的频率进行了对比。结果表明,斜拉索采用BEAM3或者LINK1单元时计算出的索单独振动的频率与弦振动理论算出的频率吻合得非常好,短索所得计算结果相对于长索误差稍大。
Due to their light and flexible characteristics, stay cables often vibrate largely under external excitation, thus affecting the mechanical properties of the whole bridge. In this paper, the finite element model of the whole bridge is established by using different cable elements. Then, the mechanical properties such as deformation, frequency and mode of the bridge are systematically studied. The natural frequency of cable obtained by dynamic theory of string and finite element model are compared , which shows that the frequency of the cable calculated using BEAM3 or LINK1 are in good agreement with that obtained by dynamic theory of string. The error of tension force of short cable obtained by dynamic theory of string is more greater than that got from long cable.
出处
《公路工程》
北大核心
2017年第2期42-46,66,共6页
Highway Engineering
基金
国家自然科学基金项目(11572117
11502076)
湖南省交通厅项目(201428)
关键词
斜拉索
有限元
建模
力学性能
弦
stay cable
finite element
modelling
mechanical properties
string
