摘要
文章介绍了一种在车桥耦合系统动力响应中考虑特大跨度斜拉桥斜拉索非线性的分析方法。首先对一个经常被用来模拟缆索的有限单元作了简要说明 ,指出了其应用在斜拉桥中时存在的问题 ,介绍了一种新的高精度非线性悬帘线索单元以及如何用来求解单根绳索受端点运动激励时的非线性动力响应问题 ,并用绳索参数共振的一个例子来说明了方法的有效性 ,同时也简要说明了斜拉桥整体结构非线性动力响应的叠代求解方法。文章重点介绍了一座铁路斜拉桥在高速移动列车荷载作用下桥梁、绳索的振动 ,并揭示了由斜拉桥主梁、索塔引起绳索高阶模态共振的现象。文章指出对于研究斜拉索的振动而言 。
This paper introduces a method that considers the non-linearity of stay-cables when analyzing dynamic responses of cable-stayed bridge under moving forces. It first revises a cable finite element, which is actually a straight truss, and reveals its defects in modeling stay cables in cable-stayed bridge. Then it proposes a short catenary cable finite element and presents an example to demonstrate its ability to exhibit parametric resonance of highly tensioned cables. The iterative solution method for the dynamic response of the overall structure of cable-stayed bridge is also explained. Finally, a quasi-real example of a railway cable-stayed bridge under TGV shows that the proposed method is efficient and capable of exhibiting resonance of stay cables. This research leads to the conclusion that the non-linearity of cables must be taken into account when vibration of the stay cables in a cable-stayed bridge is addressed.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2001年第3期67-71,共5页
China Railway Science
基金
铁道部科技研究开发计划项目 (97G0 6 )
关键词
车桥耦合
斜拉桥
移动荷载
非线性振动
共振
Bridge-train interaction
Cable-stayed bridge
Moving force
Non-linear vibration
Resonance
